UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant To Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): ~~October~~December 2527, 2005 (Date of earliest event reported) Indymac MBS, Inc. (as Depositor under the Pooling and Servicing Agreement, dated as September 1, 2005, providing for the issuance of IndyMac INDX Mortgage Loan Trust 2005-AR18 Mortgage Pass-Through Certificates, Series 2005-AR18) (Exact name of registrant as specified in charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-127556-04 95-4791925 (Commission File Number) (I.R.S. Employer Identification No.) 155 NORTH LAKE AVENUE PASADENA, CALIFORNIA 91101 (Address of principal executive offices) (Zip Code) Registrant's Telephone Number, Including Area Code: (800) 669-2300 (Former name or former address, if changed since last report.) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [ ] Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act (17 CFR 240.14a-12(b)) [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Item 8.01 Other Events Attached hereto is a copy of the Monthly Remittance Statements to the Certificateholders which was derived from the monthly information submitted by the Master Servicer of the Trust to the Trustee. Item 9.01 Financial Statements and Exhibits (c) Exhibits: Exhibit No. Description 99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~October~~December 2527, 2005. Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. Deutsche Bank National Trust Company, in its capacity as Trustee under the Pooling and Servicing Agreement on behalf of Indymac MBS, Inc., Registrant Date: ~~Oct~~Dec 2829, 2005 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT 99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~October~~December 2527, 2005.

IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
				External Parties						Table of Contents
													Page
				Seller
										1. Certificate Payment Report					2
				IndyMac Bank
										2. Collection Account Report					8
										3. Credit Enhancement Report					10
										4. Collateral Report					11
				Certificate Insurer(s)						5. Delinquency Report					14
										6. REO Report					17
										7. Foreclosure Report					18
										8. Prepayment Report					19
										9. Prepayment Detail Report					22
										10. Realized Loss Report					2425
										11. Realized Loss Detail Report					2728
				Servicer(s)
										12. Triggers and Adj. Cert. Report					2829
				IndyMac Bank
										13. Other Related Information					2930
				Underwriter(s)
				Goldman Sachs & Co.
										Total Number of Pages					2930
				Dates						Contacts
				Cut-Off Date:			September 01, 2005			Brent Hoyler
				Close Date:			September 07, 2005			Administrator
				First Distribution Date:			October 25, 2005			(714) 247-6322
										Brent.Hoyler@db.com
										Address:
										1761 East St. Andrew Place, Santa Ana, CA 92705
				Distribution Date:			~~October~~December 2527, 2005
										Factor Information:			(800) 735-7777
				Record Date:			~~September~~November 30, 2005
										Main Phone Number:			(714) 247-6000
							October 24, 2005
							December 23, 2005
										https://www.tss.db.com/invr
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IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Certificate Payment Report
Current Period Distribution - REMIC IV
					Prior												Current
	Class		Original		Principal						Total		Realized		Deferred		Principal
Class	Type	Cur	Face Value		Balance		Interest		Principal		Distribution		Loss		Interest		Balance
					(1)		(2)		(3)		(4)=(2)+(3)		(5)		(6)		(7)=(1)-(3)-(5)+(6)
1-A-1	FLT	$	629,654,000.00		~~629~~620,~~654~~987,~~000~~407.0098		32,~~357~~484,~~634~~639.1562		56,~~237~~570,~~814~~513.4648		89,~~595~~055,~~448~~153.6110		0.00		0.00		~~624~~614,416,~~185~~894.5450
1-A-2	FLT	$	262,356,000.00		~~262~~258,~~356~~744,~~000~~917.0069		1,~~573~~150,~~919~~264.1291		2,~~182~~737,~~424~~715.0869		3,~~756~~887,~~343~~980.2060		0.00		0.00		~~260~~256,~~173~~007,~~575~~202.9200
1-A-3A	FLT	$	77,413,000.00		7776,~~413~~347,~~000~~483.0024		~~426~~314,~~223~~297.5914		~~643~~807,~~964~~813.6775		1,~~070~~122,~~188~~110.2689		0.00		0.00		7675,~~769~~539,~~035~~669.3349
1-A-3B	FLT	$	80,000,000.00		8078,~~000~~898,~~000~~875.0064		~~429~~317,~~800~~787.5314		~~665~~834,~~484~~809.7940		1,~~095~~152,~~285~~596.3254		0.00		0.00		7978,~~334~~064,~~515~~066.2124
2-A-1A	FLT	$	398,032,000.00		~~398~~389,~~032~~662,~~000~~190.0058		21,~~122~~559,~~508~~081.2972		35,~~761~~018,~~613~~486.2046		56,~~884~~577,~~121~~568.4918		0.00		0.00		~~394~~384,~~270~~643,~~386~~704.8012
2-A-1B	FLT	$	300,000,000.00		~~300~~293,~~000~~691,~~000~~605.0064		1,~~787~~297,~~752~~790.0057		23,~~835~~782,~~158~~474.8862		45,~~622~~080,~~910~~265.8819		0.00		0.00		~~297~~289,~~164~~909,~~841~~131.1202
2-A-2A	FLT	$	50,000,000.00		5048,~~000~~948,~~000~~600.0094		~~271~~198,~~292~~894.0048		~~472~~630,~~526~~412.4844		~~743~~829,~~818~~306.4892		0.00		0.00		4948,~~527~~318,~~473~~188.5250
2-A-2B	FLT	$	65,846,000.00		6564,~~846~~461,~~000~~391.0055		~~234~~245,~~027~~114.6644		~~622~~830,~~279~~202.5775		~~856~~1,~~307~~075,317.2319		0.00		0.00		6563,~~223~~631,~~720~~188.4380
2-A-2C	FLT	$	175,000,000.00		~~175~~171,~~000~~320,~~000~~103.0029		1731,~~003,188~~156.6713		12,~~653~~206,~~842~~443.6853		2,~~657~~937,~~031~~599.3566		0.00		0.00		~~173~~169,~~346~~113,~~157~~659.3276
2-A-3A	FLT	$	84,508,000.00		8482,~~508~~730,~~000~~967.0036		~~465~~340,~~287~~575.5382		~~798~~1,~~645~~065,497.3688		1,~~263~~406,~~932~~073.8970		0.00		0.00		8381,~~709~~665,~~354~~469.6448
2-A-3B	FLT	$	90,000,000.00		9088,~~000~~107,~~000~~481.0070		~~483~~354,~~525~~877.6036		~~850~~1,~~547~~134,742.6639		1,~~334~~489,~~073~~619.2675		0.00		0.00		8986,~~149~~972,~~452~~739.3431
1-X	CSTR	$	0.00		0.00		0759,178.0008		0.00		0759,178.0008		0.00		0.00		0.00
2-X	CSTR	$	0.00		0.00		0648,431.0082		0.00		0648,431.0082		0.00		0.00		0.00
A-R	R	$	100.00		~~100~~0.00		0.9501		~~100~~0.00		~~100~~0.9501		0.00		0.00		0.00
B-1	SUB	$	12,201,000.00		12,~~201~~185,~~000~~157.0050		6951,~~454~~678.2861		151,~~814~~249.6878		8552,~~268~~928.9639		0.00		0.00		12,~~185~~183,~~185~~907.3272
B-2	SUB	$	49,300,000.00		49,~~300~~235,~~000~~985.0094		~~283~~211,~~927~~003.2555		635,~~901~~049.6393		~~347~~216,~~828~~053.8848		0.00		0.00		49,~~236~~230,~~098~~936.3701
B-3	SUB	$	33,764,000.00		33,~~764~~720,~~000~~158.0081		~~205~~152,~~707~~002.3998		433,~~764~~458.1954		~~249~~155,~~471~~461.5852		0.00		0.00		33,~~720~~716,~~235~~700.8127
B-4	SUB	$	14,470,000.00		14,~~470~~451,~~000~~211.0029		8965,~~316~~913.1758		181,~~755~~482.7120		~~108~~67,~~071~~395.8878		0.00		0.00		14,~~451~~449,~~244~~729.2909
B-5	SUB	$	13,264,000.00		13,~~264~~246,~~000~~777.0023		8462,~~348~~068.0851		171,~~192~~358.5267		~~101~~63,~~540~~427.6018		0.00		0.00		13,~~246~~245,~~807~~418.4856
B-6	SUB	$	10,853,000.00		10,~~853~~838,~~000~~907.0082		7152,~~476~~424.1218		141,~~067~~111.4370		8553,~~543~~535.5588		0.00		0.00		10,~~838~~837,~~932~~796.5712
B-7	SUB	$	9,647,000.00		9,~~647~~634,~~000~~473.0076		6346,~~533~~598.6074		~~12,504~~988.2417		7647,~~037~~586.8491		0.00		0.00		9,~~634~~633,~~495~~485.7659
B-8	SUB	$	7,235,000.00		7,~~235~~225,~~000~~605.0064		4734,~~648~~947.5585		~~9,377~~741.8610		5735,~~026~~688.4195		0.00		0.00		7,~~225~~224,~~622~~864.1454
B-9	SUB	$	16,882,000.00		16,~~882~~860,~~000~~079.0041		~~111~~81,~~182~~546.1558		211,~~882~~729.0927		~~133~~83,~~064~~275.2485		0.00		0.00		16,~~860~~858,~~117~~350.9114
B-10	SUB	$	18,088,000.00		18,~~088~~064,~~000~~513.0046		~~119~~87,~~124~~372.6703		231,~~445~~852.2980		~~142~~89,~~569~~224.9683		0.00		0.00		18,~~064~~062,~~554~~660.7166
B-11	SUB	$	13,269,015.79		13,~~269~~251,~~015~~786.7949		8764,~~387~~094.6147		171,~~199~~359.0218		~~104~~65,~~586~~453.6365		0.01		0.00		13,~~251~~250,~~816~~427.7630
B-X	CSTR	$	0.00		0.00		042,501.00		0.00		042,501.00		0.00		0.00		0.00
P-1	SUB	$	100.00		100.00		85181,~~805~~355.6354		0.00		85181,~~805~~355.6354		0.00		0.00		100.00
P-2	SUB	$	100.00		100.00		53176,~~452~~532.1001		0.00		53176,~~452~~532.1001		0.00		0.00		100.00
Total			2,411,782,315.79		2,~~411~~372,~~782~~615,~~315~~882.7996		1311,~~527~~712,~~523~~128.6987		1925,~~982~~639,~~306~~493.4973		3337,~~509~~351,~~830~~622.1860		0.01		0.00		2,~~391~~346,~~800~~976,~~009~~389.2922
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IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-
									Orig. Principal		Prior							Current
	Period		Period						(with Notional)		Principal						Total	Principal
Class	Starting		Ending		Method		Cusip		Balance		Balance		Interest		Principal		Distribution	Balance
									(1)		(1)		(2)		(3)		(4)=(2)+(3)	(5)
1-A-1	0911/0725/05		1012/2426/05		A-Act/360		45660LVZ9		629,654,000.00		~~1,000~~986.~~000000~~235945		53.~~332507~~946040		810.~~318560~~435118		1314.~~651066~~381157	~~991~~975.~~681440~~800828
1-A-2	0911/0725/05		1012/2426/05		A-Act/360		45660LWA3		262,356,000.00		~~1,000~~986.~~000000~~235945		54.~~999173~~384367		810.~~318560~~435118		14.~~317733~~819484	~~991~~975.~~681440~~800828
1-A-3A	0911/0725/05		1012/2426/05		A-Act/360		45660LWB1		77,413,000.00		~~1,000~~986.~~000000~~235945		54.~~505840~~060005		810.~~318560~~435117		1314.~~824400~~495122	~~991~~975.~~681440~~800828
1-A-3B	0911/0725/05		1012/2426/05		A-Act/360		45660LWC9		80,000,000.00		~~1,000~~986.~~000000~~235946		53.~~372507~~972339		810.~~318560~~435118		1314.~~691067~~407457	~~991~~975.~~681440~~800828
2-A-1A	0911/0725/05		1012/2426/05		A-Act/360		45660LWD7		398,032,000.00		~~1,000~~978.~~000000~~972019		53.~~332507~~916976		912.~~450530~~608249		1416.~~783036~~525225	~~990~~966.~~549470~~363770
2-A-1B	0911/0725/05		1012/2426/05		A-Act/360		45660LWE5		300,000,000.00		~~1,000~~978.~~000000~~972019		54.~~959173~~325969		912.~~450530~~608249		1516.~~409703~~934217	~~990~~966.~~549470~~363770
2-A-2A	0911/0725/05		1012/2426/05		A-Act/360		45660LWV7		50,000,000.00		~~1,000~~978.~~000000~~972019		53.~~425840~~977890		912.~~450530~~608249		1416.~~876370~~586138	~~990~~966.~~549470~~363770
2-A-2B	0911/01/05		0911/30/05		A-30/360		45660LWW5		65,846,000.00		~~1,000~~978.~~000000~~972019		3.~~554167~~722541		912.~~450530~~608249		1316.~~004696~~330790	~~990~~966.~~549470~~363770
2-A-2C	0911/0725/05		1012/2426/05		A-Act/360		45660LWF2		175,000,000.00		~~1,000~~978.~~000000~~972019		54.~~732507~~178035		912.~~450530~~608249		1516.~~183036~~786284	~~990~~966.~~549470~~363770
2-A-3A	0911/0725/05		1012/2426/05		A-Act/360		45660LWG0		84,508,000.00		~~1,000~~978.~~000000~~972019		54.~~505840~~030102		912.~~450530~~608249		1416.~~956370~~638350	~~990~~966.~~549470~~363770
2-A-3B	0911/0725/05		1012/2426/05		A-Act/360		45660LWH8		90,000,000.00		~~1,000~~978.~~000000~~972019		53.~~372507~~943082		912.~~450530~~608249		1416.~~823036~~551331	~~990~~966.~~549470~~363770
1-X	0911/01/05		0911/30/05		A-30/360		45660LWS4		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
2-X	0911/01/05		0911/30/05		A-30/360		45660LWT2		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
A-R	0911/01/05		0911/30/05		A-30/360		45660LYT0		100.00		~~1,000~~0.000000		90.~~500000~~100000		~~1,000~~0.000000		~~1,009~~0.~~500000~~100000	0.000000
B-1	0911/0725/05		1012/2426/05		A-30Act/360		45660LWJ4		12,201,000.00		~~1,000~~998.~~000000~~701541		54.~~692507~~235604		10.~~296179~~102433		64.~~988686~~338037	998.~~703821~~599108
B-2	0911/0725/05		1012/2426/05		A-30Act/360		45660LWK1		49,300,000.00		~~1,000~~998.~~000000~~701540		54.~~759173~~279991		10.~~296179~~102433		74.~~055353~~382424	998.~~703821~~599108
B-3	0911/0725/05		1012/2426/05		A-30Act/360		45660LWL9		33,764,000.00		~~1,000~~998.~~000000~~701540		64.~~092507~~501925		10.~~296179~~102433		74.~~388686~~604357	998.~~703821~~599108
B-4	0911/0725/05		1012/2426/05		A-30Act/360		45660LWM7		14,470,000.00		~~1,000~~998.~~000000~~701540		64.~~172507~~555189		10.~~296179~~102433		74.~~468686~~657621	998.~~703821~~599108
B-5	0911/0725/05		1012/2426/05		A-30Act/360		45660LWN5		13,264,000.00		~~1,000~~998.~~000000~~701540		64.~~359174~~679472		10.~~296179~~102433		74.~~655353~~781904	998.~~703821~~599107
B-6	0911/0725/05		1012/2426/05		A-30Act/360		45660LWP0		10,853,000.00		~~1,000~~998.~~000000~~701541		64.~~585840~~830386		10.~~296179~~102433		74.~~882019~~932819	998.~~703821~~599108
B-7	0911/0725/05		1012/2426/05		A-30Act/360		45660LWQ8		9,647,000.00		~~1,000~~998.~~000000~~701540		64.~~585840~~830387		10.~~296179~~102433		74.~~882019~~932820	998.~~703821~~599107
B-8	0911/0725/05		1012/2426/05		A-30Act/360		45660LWR6		7,235,000.00		~~1,000~~998.~~000000~~701540		64.~~585840~~830387		10.~~296180~~102433		74.~~882019~~932820	998.~~703820~~599107
B-9	0911/0725/05		1012/2426/05		A-30Act/360		45660LWX3		16,882,000.00		~~1,000~~998.~~000000~~701541		64.~~585840~~830386		10.~~296179~~102433		74.~~882019~~932819	998.~~703821~~599108
B-10	0911/0725/05		1012/2426/05		A-30Act/360		45660LWY1		18,088,000.00		~~1,000~~998.~~000000~~701540		64.~~585840~~830386		10.~~296179~~102433		74.~~882019~~932819	998.~~703821~~599108
B-11	0911/0725/05		1012/2426/05		A-30Act/360		45660LWZ8		13,269,015.79		~~1,000~~998.~~000000~~701539		64.~~585840~~830386		10.~~296179~~102433		74.~~882019~~932819	998.~~703820~~599106
B-X	0911/01/05		0911/30/05		A-30/360		45660LWU9		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
P-1	0911/0725/05		1012/24/05		A-30/360		45660LYU7		100.00		1,000.000000		~~858~~1,~~056~~813,555.~~300000~~400000		0.000000		~~858~~1,~~056~~813,555.~~300000~~400000	1,000.000000
P-2	0911/0725/05		1012/24/05		A-30/360		45660LYV5		100.00		1,000.000000		~~534~~1,~~521~~765,320.~~000000~~100000		0.000000		~~534~~1,~~521~~765,320.~~000000~~100000	1,000.000000
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IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Distribution to Date - REMIC IV
																	Current
	Original				Unscheduled		Scheduled		Total		Total		Realized		Deferred		Principal
Class	Face Value		Interest		Principal		Principal		Principal		Distribution		Loss		Interest		Balance
	(1)		(2)		(3)		(4)		(5)=(3)+(4)		(6)=(2)+(5)		(7)		(8)		(9)=(1)-(5)-(7)+(8)
1-A-1	629,654,000.00		38,~~357~~179,~~634~~888.1550		414,~~311~~176,~~504~~290.2512		~~926~~1,~~310~~060,815.2138		515,237,~~814~~105.4650		823,~~595~~416,~~448~~994.6100		0.00		0.00		~~624~~614,416,~~185~~894.5450
1-A-2	262,356,000.00		13,~~573~~810,~~919~~209.1297		15,~~796~~906,~~461~~791.2531		~~385~~442,~~962~~006.8369		26,~~182~~348,~~424~~798.0800		310,~~756~~159,~~343~~007.2097		0.00		0.00		~~260~~256,~~173~~007,~~575~~202.9200
1-A-3A	77,413,000.00		~~426~~1,~~223~~036,513.5934		~~530~~1,~~079~~742,908.1825		~~113~~130,~~885~~422.4926		~~643~~1,~~964~~873,330.6751		12,~~070~~909,~~188~~843.2685		0.00		0.00		7675,~~769~~539,~~035~~669.3349
1-A-3B	80,000,000.00		~~429~~1,~~800~~046,640.5323		~~547~~1,~~793~~801,153.4602		~~117~~134,~~691~~780.3374		~~665~~1,~~484~~935,933.7976		12,~~095~~982,~~285~~573.3299		0.00		0.00		7978,~~334~~064,~~515~~066.2124
2-A-1A	398,032,000.00		25,~~122~~157,~~508~~612.2939		312,~~308~~933,~~517~~591.4608		~~453~~454,~~095~~704.7480		313,~~761~~388,~~613~~295.2088		518,~~884~~545,~~121~~908.4927		0.00		0.00		~~394~~384,~~270~~643,~~386~~704.8012
2-A-1B	300,000,000.00		14,~~787~~318,~~752~~302.0002		29,~~493~~748,~~656~~154.8822		~~341~~342,~~502~~714.0076		210,~~835~~090,~~158~~868.8898		414,~~622~~409,~~910~~171.8800		0.00		0.00		~~297~~289,~~164~~909,~~841~~131.1202
2-A-2A	50,000,000.00		~~271~~658,~~292~~586.0093		~~415~~1,~~609~~624,692.4837		5657,~~917~~119.0013		~~472~~1,~~526~~681,811.4850		~~743~~2,~~818~~340,398.4843		0.00		0.00		4948,~~527~~318,~~473~~188.5250
2-A-2B	65,846,000.00		~~234~~719,~~027~~328.6645		~~547~~2,~~324~~139,589.4488		7475,~~955~~221.1332		~~622~~2,~~279~~214,811.5720		~~856~~2,~~307~~934,139.2365		0.00		0.00		6563,~~223~~631,~~720~~188.4380
2-A-2C	175,000,000.00		12,~~003~~428,~~188~~078.6752		15,~~454~~686,~~633~~423.1830		199,~~209~~916.5094		15,~~653~~886,~~842~~340.6824		28,~~657~~314,~~031~~418.3576		0.00		0.00		~~173~~169,~~346~~113,~~157~~659.3276
2-A-3A	84,508,000.00		~~465~~1,~~287~~128,615.5323		~~702~~2,~~446~~745,990.5206		96,~~198~~540.8446		~~798~~2,~~645~~842,530.3652		13,~~263~~971,~~932~~145.8975		0.00		0.00		8381,~~709~~665,~~354~~469.6448
2-A-3B	90,000,000.00		~~483~~1,~~525~~174,453.6006		~~748~~2,~~097~~924,446.0626		102,~~450~~814.6043		~~850~~3,~~547~~027,260.6669		14,~~334~~201,~~073~~713.2675		0.00		0.00		8986,~~149~~972,~~452~~739.3431
1-X	0.00		01,669,045.0041		0.00		0.00		0.00		01,669,045.0041		0.00		0.00		0.00
2-X	0.00		01,450,522.0004		0.00		0.00		0.00		01,450,522.0004		0.00		0.00		0.00
A-R	100.00		0138,549.9539		82.31		17.69		100.00		~~100~~138,649.9539		0.00		0.00		0.00
B-1	12,201,000.00		69169,~~454~~583.2839		0.00		1517,~~814~~092.6828		1517,~~814~~092.6828		85186,~~268~~675.9667		0.00		0.00		12,~~185~~183,~~185~~907.3272
B-2	49,300,000.00		~~283~~692,~~927~~822.2530		0.00		6369,~~901~~063.6399		6369,~~901~~063.6399		~~347~~761,~~828~~886.8829		0.00		0.00		49,~~236~~230,~~098~~936.3701
B-3	33,764,000.00		~~205~~500,~~707~~499.3918		0.00		4347,~~764~~299.1973		4347,~~764~~299.1973		~~249~~547,~~471~~798.5891		0.00		0.00		33,~~720~~716,~~235~~700.8127
B-4	14,470,000.00		89217,~~316~~170.1739		0.00		1820,~~755~~270.7191		1820,~~755~~270.7191		~~108~~237,~~071~~441.8830		0.00		0.00		14,~~451~~449,~~244~~729.2909
B-5	13,264,000.00		84204,~~348~~791.0877		0.00		1718,~~192~~581.5244		1718,~~192~~581.5244		~~101~~223,~~540~~373.6021		0.00		0.00		13,~~246~~245,~~807~~418.4856
B-6	10,853,000.00		71173,~~476~~251.1231		0.00		1415,~~067~~203.4388		1415,~~067~~203.4388		85188,~~543~~455.5519		0.00		0.00		10,~~838~~837,~~932~~796.5712
B-7	9,647,000.00		63145,~~533~~280.6042		0.00		1213,~~504~~514.2441		1213,~~504~~514.2441		76158,~~037~~794.8483		0.00		0.00		9,~~634~~633,~~495~~485.7659
B-8	7,235,000.00		4796,~~648~~398.5533		0.00		910,~~377~~135.8646		910,~~377~~135.8646		57106,~~026~~533.4179		0.00		0.00		7,~~225~~224,~~622~~864.1454
B-9	16,882,000.00		~~111~~224,~~182~~933.1586		0.00		2123,~~882~~649.0986		2123,~~882~~649.0986		~~133~~248,~~064~~583.2472		0.00		0.00		16,~~860~~858,~~117~~350.9114
B-10	18,088,000.00		~~119~~241,~~124~~002.6748		0.00		2325,~~445~~339.2934		2325,~~445~~339.2934		~~142~~266,~~569~~341.9682		0.00		0.00		18,~~064~~062,~~554~~660.7166
B-11	13,269,015.79		87176,~~387~~794.6187		0.00		1718,~~199~~588.0246		1718,~~199~~588.0246		~~104~~195,~~586~~383.6333		0.0102		0.00		13,~~251~~250,~~816~~427.7630
B-X	0.00		0114,967.0066		0.00		0.00		0.00		0114,967.0066		0.00		0.00		0.00
P-1	100.00		85374,~~805~~145.6310		0.00		0.00		0.00		85374,~~805~~145.6310		0.00		0.00		100.00
P-2	100.00		53313,~~452~~086.1072		0.00		0.00		0.00		53313,~~452~~086.1072		0.00		0.00		100.00
Total	2,411,782,315.79		1336,~~527~~561,~~523~~073.6926		1661,~~856~~430,~~205~~112.4718		3,~~126~~375,~~101~~814.0236		1964,~~982~~805,~~306~~926.4954		33101,~~509~~366,~~830~~999.1880		0.0102		0.00		2,~~391~~346,~~800~~976,~~009~~389.2922
Page 4 of 29
Page 4 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Interest Detail - REMIC IV
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or		Current
	Through		(with Notional)		Accrued		Supported		Unpaid		Interest		Optimal		Deferred		Unpaid
Class	Rate		Balance		Interest		Interest SF		Interest		Adjustment		Interest		Interest		Interest
					(1)		(2)		(3)		(4)		(5)=(1)-(2)+(3)+(4)		(6)		(7)=(5)-(6)
1-A-1	34.~~99938~~50125%		~~629~~620,~~654~~987,~~000~~407.0098		32,~~357~~484,~~634~~639.1562		0.00		0.00		0.00		32,~~357~~484,~~634~~639.1562		32,~~357~~484,~~634~~639.1562		0.00
1-A-2	45.~~07068~~00125%		~~262~~258,~~356~~744,~~000~~917.0069		1,~~423~~150,~~957~~264.0891		0.00		0.00		0.00		1,~~423~~150,~~957~~264.0891		1,~~573~~150,~~919~~264.1291		0.00
1-A-3A	4.~~07068~~63125%		7776,~~413~~347,~~000~~483.0024		~~420~~314,~~164~~297.9314		0.00		0.00		0.00		~~420~~314,~~164~~297.9314		~~426~~314,~~223~~297.5914		0.00
1-A-3B	4.~~02938~~53125%		8078,~~000~~898,~~000~~875.0064		~~429~~317,~~800~~787.5314		0.00		0.00		0.00		~~429~~317,~~800~~787.5314		~~429~~317,~~800~~787.5314		0.00
2-A-1A	34.~~99938~~50125%		~~398~~389,~~032~~662,~~000~~190.0058		21,~~122~~559,~~508~~081.2972		0.00		0.00		0.00		21,~~122~~559,~~508~~081.2972		21,~~122~~559,~~508~~081.2972		0.00
2-A-1B	4.~~15904~~97125%		~~300~~293,~~000~~691,~~000~~605.0064		1,~~663~~297,~~615~~790.4557		0.00		0.00		0.00		1,~~663~~297,~~615~~790.4557		1,~~787~~297,~~752~~790.0057		0.00
2-A-2A	4.~~06938~~57125%		5048,~~000~~948,~~000~~600.0094		~~271~~198,~~292~~894.0048		0.00		0.00		0.00		~~271~~198,~~292~~894.0048		~~271~~198,~~292~~894.0048		0.00
2-A-2B	4.~~15904~~56300%		6564,~~846~~461,~~000~~391.0055		~~228~~245,~~213~~114.3844		0.00		0.00		0.00		~~228~~245,~~213~~114.3844		~~234~~245,~~027~~114.6644		0.00
2-A-2C	4.~~15904~~80125%		~~175~~171,~~000~~320,~~000~~103.0029		~~970~~731,~~442~~156.3513		0.00		0.00		0.00		~~970~~731,~~442~~156.3513		1731,~~003,188~~156.6713		0.00
2-A-3A	4.~~12938~~63125%		8482,~~508~~730,~~000~~967.0036		~~465~~340,~~287~~575.5382		0.00		0.00		0.00		~~465~~340,~~287~~575.5382		~~465~~340,~~287~~575.5382		0.00
2-A-3B	4.~~02938~~53125%		9088,~~000~~107,~~000~~481.0070		~~483~~354,~~525~~877.6036		0.00		0.00		0.00		~~483~~354,~~525~~877.6036		~~483~~354,~~525~~877.6036		0.00
1-X	0.00000%		0.00		~~127~~759,~~573~~178.0608		0.00		0.00		0.00		~~127~~759,~~573~~178.0608		0759,178.0008		~~127,573~~0.0600
2-X	0.00000%		0.00		~~180~~648,~~915~~431.5882		0.00		0.00		0.00		~~180~~648,~~915~~431.5882		0648,431.0082		~~180,915~~0.5800
A-R	110.~~40000~~00000%		~~100~~0.00		0.5500		0.00		0.00		0.00		0.5500		0.9501		0.00
B-1	24.~~95971~~77125%		12,~~201~~185,~~000~~157.0050		4851,~~148~~678.5461		0.00		0.00		0.00		4851,~~148~~678.5461		6951,~~454~~678.2861		0.00
B-2	24.~~95971~~82125%		49,~~300~~235,~~000~~985.0094		~~194~~211,~~551~~003.5055		0.00		0.00		0.00		~~194~~211,~~551~~003.5055		~~283~~211,~~927~~003.2555		0.00
B-3	25.~~95971~~07125%		33,~~764~~720,~~000~~158.0081		~~133~~152,~~242~~002.1298		0.00		0.00		0.00		~~133~~152,~~242~~002.1298		~~205~~152,~~707~~002.3998		0.00
B-4	25.~~95971~~13125%		14,~~470~~451,~~000~~211.0029		5765,~~102~~913.6458		0.00		0.00		0.00		5765,~~102~~913.6458		8965,~~316~~913.1758		0.00
B-5	25.~~95971~~27125%		13,~~264~~246,~~000~~777.0023		5262,~~343~~068.4351		0.00		0.00		0.00		5262,~~343~~068.4351		8462,~~348~~068.0851		0.00
B-6	25.~~95971~~44125%		10,~~853~~838,~~000~~907.0082		4252,~~828~~424.9518		0.00		0.00		0.00		4252,~~828~~424.9518		7152,~~476~~424.1218		0.00
B-7	25.~~95971~~44125%		9,~~647~~634,~~000~~473.0076		3846,~~069~~598.74		0.00		0.00		0.00		3846,~~069~~598.74		6346,~~533~~598.6074		0.00
B-8	25.~~95971~~44125%		7,~~235~~225,~~000~~605.0064		2834,~~551~~947.3285		0.00		0.00		0.00		2834,~~551~~947.3285		4734,~~648~~947.5585		0.00
B-9	25.~~95971~~44125%		16,~~882~~860,~~000~~079.0041		6681,~~621~~546.0658		0.00		0.00		0.00		6681,~~621~~546.0658		~~111~~81,~~182~~546.1558		0.00
B-10	25.~~95971~~44125%		18,~~088~~064,~~000~~513.0046		7187,~~380~~372.2703		0.00		0.00		0.00		7187,~~380~~372.2703		~~119~~87,~~124~~372.6703		0.00
B-11	25.~~95971~~44125%		13,~~269~~251,~~015~~786.7949		5264,~~363~~094.2247		0.00		0.00		0.00		5264,~~363~~094.2247		8764,~~387~~094.6147		0.00
B-X	0.00000%		0.00		~~321~~42,~~204~~501.6400		0.00		0.00		0.00		~~321~~42,~~204~~501.6400		042,501.00		~~321,204~~0.6400
P-1	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		85181,~~805~~355.6354		0.00
P-2	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		53176,~~452~~532.1001		0.00
Total			2,~~411~~372,~~782~~615,~~315~~882.7996		1311,~~251~~354,~~337~~241.9131		0.00		0.00		0.00		1311,~~251~~354,~~337~~241.9131		1311,~~527~~712,~~523~~128.6987		~~629,693~~0.2800
Page 5 of 29
Page 5 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Current Period Distribution - REMIC IV
					Prior												Current
	Class		Original		Principal						Total		Realized		Deferred		Principal
Class	Type	Cur	Face Value		Balance		Interest		Principal		Distribution		Loss		Interest		Balance
					(1)		(2)		(3)		(4)=(2)+(3)		(5)		(6)		(7)=(1)-(3)-(5)+(6)
1-X-IO	CSTR	$	0.00		0.00		0759,178.0008		0.00		0759,178.0008		0.00		0.00		0.00
2-X-IO	CSTR	$	0.00		0.00		0648,431.0082		0.00		0648,431.0082		0.00		0.00		0.00
B-X-IO	CSTR	$	0.00		0.00		042,501.00		0.00		042,501.00		0.00		0.00		0.00
1-X-PO	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X-PO	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-1	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-2	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
Total			0.00		0.00		01,450,110.0090		0.00		01,450,110.0090		0.00		0.00		0.00
Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-
									Orig. Principal		Prior						Current
	Period		Period						(with Notional)		Principal						Total	Principal
Class	Starting		Ending		Method		Cusip		Balance		Balance		Interest		Principal		Distribution	Balance
									(1)		(1)		(2)		(3)		(4)=(2)+(3)	(5)
1-X-IO	0911/01/05		0911/30/05		A-30/360				1,049,423,000.00		~~1,000~~986.~~000000~~235945		0.~~000000~~723424		0.000000		0.~~000000~~723424	~~991~~975.~~681440~~800828
2-X-IO	0911/01/05		0911/30/05		A-30/360				1,163,386,000.00		~~1,000~~978.~~000000~~972019		0.~~000000~~557366		0.000000		0.~~000000~~557366	~~990~~966.~~549470~~363770
B-X-IO	0911/01/05		0911/30/05		A-30/360				198,973,015.00		~~1,000~~998.~~000000~~701544		0.~~000000~~213602		0.000000		0.~~000000~~213602	998.~~703825~~599112
1-X-PO	0911/01/05		0911/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
2-X-PO	0911/01/05		0911/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
B-X-PO-1	0911/01/05		0911/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
B-X-PO-2	0911/01/05		0911/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
Page 6 of 29
Page 6 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Distribution to Date - REMIC IV
																	Current
	Original				Unscheduled		Scheduled		Total		Total		Realized		Deferred		Principal
Class	Face Value		Interest		Principal		Principal		Principal		Distribution		Loss		Interest		Balance
	(1)		(2)		(3)		(4)		(5)=(3)+(4)		(6)=(2)+(5)		(7)		(8)		(9)=(1)-(5)-(7)+(8)
1-X-IO	0.00		01,669,024.0081		0.00		0.00		0.00		01,669,045.0041		0.00		0.00		0.00
2-X-IO	0.00		01,450,522.0004		0.00		0.00		0.00		01,450,522.0004		0.00		0.00		0.00
B-X-IO	0.00		0114,967.0064		0.00		0.00		0.00		0114,967.0064		0.00		0.00		0.00
1-X-PO	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X-PO	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-1	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-2	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
Total	0.00		03,234,514.0049		0.00		0.00		0.00		03,234,535.0009		0.00		0.00		0.00
Interest Detail - REMIC IV
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or		Current
	Through		(with Notional)		Accrued		Supported		Unpaid		Interest		Optimal		Deferred		Unpaid
Class	Rate		Balance		Interest		Interest SF		Interest		Adjustment		Interest		Interest		Interest
				(1)		(2)		(3)		(4)		(5)=(1)-(2)+(3)+(4)		(6)		(7)=(5)-(6)
1-X-IO	0.~~14588~~88022%		1,~~049~~034,~~423~~978,~~000~~684.0055		~~127~~759,~~573~~178.0608		0.00		0.00		0.00		~~127~~759,~~573~~178.0608		0759,178.0008		~~127,573~~0.0600
2-X-IO	0.~~18661~~68321%		1,~~163~~138,~~386~~922,~~000~~341.0006		~~180~~648,~~915~~431.5882		0.00		0.00		0.00		~~180~~648,~~915~~431.5882		0648,431.0082		~~180,915~~0.5800
B-X-IO	10.~~93718~~25666%		198,~~973~~714,~~015~~657.0035		~~321~~42,~~204~~501.6400		0.00		0.00		0.00		~~321~~42,~~204~~501.6400		042,501.00		~~321,204~~0.6400
1-X-PO	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X-PO	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-1	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-PO-2	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
Total			2,~~411~~372,~~782~~615,~~015~~682.0096		~~629~~1,~~693~~450,110.2890		0.00		0.00		0.00		~~629~~1,~~693~~450,110.2890		01,450,110.0090		~~629,693~~0.2800
Page 7 of 29
Page 7 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Collection Account Report
SUMMARY
										Group 2		Group 1		Total
Principal Collections										1114,~~113~~668,~~695~~260.6707		810,~~868~~971,~~610~~233.8267		1925,~~982~~639,~~306~~493.4874
Principal Withrawals										0.00		0.00		0.00
Principal Other Accounts										0.00		0.00		0.00
TOTAL NET PRINCIPAL										1114,~~113~~668,~~695~~260.6707		810,~~868~~971,~~610~~233.8267		1925,~~982~~639,~~306~~493.4874
Interest Collections										5,~~063~~969,~~255~~487.3553		45,~~454~~588,~~307~~260.1622		911,~~517~~557,~~562~~747.5175
Interest Withdrawals										-0.00		-0.00		-0.00
Interest Other Accounts										53176,~~452~~532.1001		4181,~~220,760~~355.6254		4357,~~274,212~~887.7255
Interest Fees										-~~114~~91,~~888~~800.6722		-~~126~~96,~~696~~861.1921		-~~264~~203,~~251~~506.5344
TOTAL NET INTEREST										56,~~001~~054,~~818~~219.7832		85,~~548~~672,~~371~~754.5955		1311,~~527~~712,~~523~~128.7086
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION										1620,~~115~~722,~~514~~479.4539		1716,~~416~~643,~~982~~988.4122		3337,~~509~~351,~~830~~622.1860
PRINCIPAL - COLLECTIONS
											Group 2		Group 1		Total
Scheduled Principal Received											~~432,410~~0.6500		~~548,453~~214.2645		~~980,863~~214.9145
Curtailments											(21,~~423~~551,~~123~~844.1761)		(1,~~930~~577,~~440~~555.5820)		(43,~~353~~129,~~563~~399.7581)
Prepayments In Full											1216,~~093~~220,~~408~~104.1968		912,~~116~~304,~~361~~534.0312		2128,~~209~~524,~~769~~638.2280
Repurchased/Substitutions											~~1,011,000~~0.00		1244,~~134,237~~040.1130		2244,~~145,237~~040.1130
Liquidations											0.00		0.00		0.00
Insurance Principal											0.00		0.00		0.00
Other Additional Principal											0.00		0.00		0.00
Delinquent Principal											-~~237,130~~0.6700		-~~314,408~~214.4445		-~~551,539~~214.1145
Realized Losses											-0.00		-0.00		-0.00
Advanced Principal											~~237,130~~0.6700		~~314,408~~214.4445		~~551,539~~214.1145
TOTAL PRINCIPAL COLLECTED											1114,~~113~~668,~~695~~260.6707		810,~~868~~971,~~610~~233.8267		1925,~~982~~639,~~306~~493.4874
PRINCIPAL - WITHDRAWALS
SPACE INTENTIONALLY LEFT BLANK
PRINCIPAL - OTHER ACCOUNTS
										Group 2		Group 1		Total
TOTAL PRINCIPAL OTHER ACCOUNTS										0.00		0.00		0.00
Page 8 of 29
Page 8 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
INTEREST - COLLECTIONS
										Group 2		Group 1		Total
Scheduled Interest										56,~~345~~266,~~886~~771.2894		45,~~685~~843,~~086~~471.3568		1012,~~030~~110,~~972~~243.6362
Repurchased/Substitution Interest										~~842~~0.5000		1,~~864~~273.0769		21,~~706~~273.5769
Liquidation Interest										0.00		0.00		0.00
Insurance Interest										0.00		0.00		0.00
Other Additional Interest										0.00		0.00		0.00
Prepayment Interest Shortfalls										-108,~~034~~230.0752		-9,~~160~~251.7468		-1917,~~194~~482.8120
Delinquent Interest										-34,~~950~~798,~~467~~786.6780		-34,~~128~~252,~~014~~274.5974		-79,~~078~~051,~~482~~061.2654
Compensating Interest										108,~~034~~230.0752		9,~~160~~251.7468		1917,~~194~~482.8120
Civil Relief Act Shortfalls										-0.00		-0.00		-0.00
Interest Advanced										34,~~666~~501,~~994~~502.2439		23,~~895~~995,~~371~~789.3359		68,~~562~~497,~~365~~291.5798
TOTAL INTEREST COLLECTED										5,~~063~~969,~~255~~487.3553		45,~~454~~588,~~307~~260.1622		911,~~517~~557,~~562~~747.5175
INTEREST - WITHDRAWALS
										Group 2		Group 1		Total
TOTAL INTEREST WITHDRAWALS										0.00		0.00		0.00
INTEREST - OTHER ACCOUNTS
										Group 2		Group 1		Total
Prepayment Charges										176,532.01		181,355.54		~~139~~357,~~257~~887.7355
Capitalized Interest														~~4,134,954~~0.9900
BONY Class 1-A-1, 1-A-2, 1-A-3A & 1-A-3B Cap Payment														0.00
BONY Class 2-A-1A, 2-A-1B,2-A-2A, 2-A-2C, 2-A-3A, &														0.00
TOTAL INTEREST OTHER ACCOUNTS										53176,~~452~~532.1001		4181,~~220,760~~355.6254		4357,~~274,212~~887.7255
INTEREST - FEES
										Group 2		Group 1		Total
Current Servicing Fees										~~112~~91,~~775~~282.3413		~~124~~96,~~789~~390.8871		~~237~~187,~~565~~672.2284
Class 1-A-3B Ambac Premium														107,~~666~~013.6723
Class 2-A-3B Ambac Premium														127,~~000~~831.0078
Trustee Fees										~~2,113~~518.3309		~~1,906~~470.3150		~~4,019~~988.6459
TOTAL INTEREST FEES										~~114~~91,~~888~~800.6722		~~126~~96,~~696~~861.1921		~~264~~203,~~251~~506.5344
Page 9 of 29
Page 9 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Credit Enhancement Report
ACCOUNTS
SPACE INTENTIONALLY LEFT BLANK
INSURANCE
										Group 2		Group 1		Total
Class 1-A-3B Ambac Premium														107,~~666~~013.6723
Class 2-A-3B Ambac Premium														127,~~000~~831.0078
STRUCTURAL FEATURES
SPACE INTENTIONALLY LEFT BLANK
Page 10 of 29
Page 10 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Collateral Report
COLLATERAL
											Group 2		Group 1		Total
Loan Count:
Original										2,555		4,879		7,434
Prior										2,~~555~~502		4,~~879~~807		7,~~434~~309
Prefunding										0		0		0
Scheduled Paid Offs										-0		-0		-0
Full Voluntary Prepayments										-2331		-3854		-6185
Repurchases										-20		-41		-61
Liquidations										-0		-0		-0
Current										2,~~530~~471		4,~~837~~752		7,~~367~~223
Principal Balance:
Original										1,267,996,081.81		1,143,786,033.97		2,411,782,115.7778
Prior										1,~~267~~243,~~996~~412,~~081~~914.8159		1,~~143~~129,~~786~~202,~~033~~768.9737		2,~~411~~372,~~782~~615,~~115~~682.7796
Prefunding										0.00		0.00		0.00
Scheduled Principal										-~~432,410~~0.6500		-~~548,453~~214.2645		-~~980,863~~214.9145
Partial Prepayments										(21,~~423~~551,~~123~~844.1761)		(1,~~930~~577,~~440~~555.5820)		(43,~~353~~129,~~563~~399.7581)
Full Voluntary Prepayments										-1216,~~093~~220,~~408~~104.1968		-912,~~116~~304,~~361~~534.0312		-2128,~~209~~524,~~769~~638.2280
Repurchases										-~~1,011,000~~0.00		-1244,~~134,237~~040.1130		-2244,~~145,237~~040.1130
Liquidations										-0.00		-0.00		-0.00
Current										1,~~256~~228,~~882~~744,~~386~~654.1452		1,~~134~~118,~~917~~231,~~423~~534.1570		2,~~391~~346,~~799~~976,~~809~~189.2922
PREFUNDING
SPACE INTENTIONALLY LEFT BLANK
Page 11 of 29
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IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
CHARACTERISTICS
										Group 2		Group 1		Total
Weighted Average Coupon Original										5.06001%		4.91730%		4.99233%
Weighted Average Coupon Prior										5.~~06001~~89410%		46.~~91730~~06636%		45.~~99233~~97584%
Weighted Average Coupon Current										56.~~06001~~04797%		46.~~91730~~21115%		46.~~99233~~12564%
Weighted Average Months to Maturity Original										357		358		357
Weighted Average Months to Maturity Prior										~~357~~356		~~358~~357		357
Weighted Average Months to Maturity Current										~~357~~355		~~358~~356		~~357~~356
Weighted Avg Remaining Amortization Term Original										357		358		357
Weighted Avg Remaining Amortization Term Prior										~~357~~356		~~358~~357		357
Weighted Avg Remaining Amortization Term Current										~~357~~355		~~358~~356		~~357~~356
Weighted Average Seasoning Original										2.52		2.28		2.40
Weighted Average Seasoning Prior										23.5251		23.28		23.40
Weighted Average Seasoning Current										24.5251		24.2827		24.40
Page 12 of 29
Page 12 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
ARM CHARACTERISTICS
										Group 2		Group 1		Total
Weighted Average Margin Original										2.88392%		3.04715%		2.96133%
Weighted Average Margin Prior										2.~~88392~~88426%		3.~~04715~~04738%		2.~~96133~~96166%
Weighted Average Margin Current										2.~~88392~~88367%		3.~~04715~~04763%		2.~~96133~~96170%
Weighted Average Max Rate Original										9.08990%		8.92349%		9.01098%
Weighted Average Max Rate Prior										9.~~08990~~05617%		8.~~92349~~92344%		98.~~01098~~99319%
Weighted Average Max Rate Current										9.~~08990~~06039%		8.~~92349~~92351%		98.~~01098~~99525%
Weighted Average Min Rate Original										1.09215%		1.10615%		1.09879%
Weighted Average Min Rate Prior										1.~~09215~~09253%		1.~~10615~~10681%		1.~~09879~~09930%
Weighted Average Min Rate Current										1.~~09215~~09155%		1.~~10615~~10723%		1.~~09879~~09901%
Weighted Average Cap Up Original										96.13668%		97.88894%		96.96769%
Weighted Average Cap Up Prior										96.~~13668~~12632%		97.~~88894~~93300%		96.~~96769~~98360%
Weighted Average Cap Up Current										96.~~13668~~14066%		97.~~88894~~93948%		96.~~96769~~99677%
Weighted Average Cap Down Original										96.13668%		97.88894%		96.96769%
Weighted Average Cap Down Prior										96.~~13668~~12632%		97.~~88894~~93300%		96.~~96769~~98360%
Weighted Average Cap Down Current										96.~~13668~~14066%		97.~~88894~~93948%		96.~~96769~~99677%
SERVICING FEES & ADVANCES
											Group 2		Group 1		Total
Current Servicing Fees										~~112~~91,~~775~~282.3413		~~124~~96,~~789~~390.8871		~~237~~187,~~565~~672.2284
Delinquent Servicing Fees										~~283~~297,~~473~~284.4341		~~232~~256,~~643~~485.2615		~~516~~553,~~116~~769.6956
TOTAL SERVICING FEES										~~396~~388,~~248~~566.7854		~~357~~352,~~433~~875.1588		~~753~~741,~~681~~442.9342
Total Servicing Fees										~~396~~388,~~248~~566.7854		~~357~~352,~~433~~875.1588		~~753~~741,~~681~~442.9342
Compensating Interest										-108,~~034~~230.0752		-9,~~160~~251.7468		-1917,~~194~~482.8120
Delinquent Servicing Fees										-~~283~~297,~~473~~284.4341		-~~232~~256,~~643~~485.2615		-~~516~~553,~~116~~769.6956
COLLECTED SERVICING FEES										~~102~~83,~~741~~051.2761		~~115~~87,~~629~~139.1505		~~218~~170,~~370~~190.4265
Total Advaced Interest										34,~~666~~501,~~994~~502.2439		23,~~895~~995,~~371~~789.3359		68,~~562~~497,~~365~~291.5798
Total Advaced Principal										~~237,130~~0.6700		~~314,408~~214.4445		~~551,539~~214.1145
Aggregate Advances with respect to this Distribution										34,~~904~~501,~~124~~502.9139		3,~~209~~996,~~779~~004.7704		78,~~113~~497,~~904~~506.6843
ADDITIONAL COLLATERAL INFORMATION
										Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)										108,~~034~~230.0752		9,~~160~~251.7468		1917,~~194~~482.8120
Compensating Interest										-108,~~034~~230.0752		-9,~~160~~251.7468		-1917,~~194~~482.8120
Net Prepayment Interest Shortfall (PPIS)										0.00		0.00		0.00
Weighted Average Net Mortgage Rate										65.~~740389~~672472%		65.~~597679~~835691%		65.~~672709~~750153%
Current Deferred Interest										12,~~676~~253,~~526~~452.3424		12,~~504~~169,~~752~~088.0940		34,~~181~~422,~~278~~540.4364
Cumulative Deferred Interest										12,~~676~~253,~~526~~452.3424		12,~~504~~169,~~752~~088.0940		34,~~181~~422,~~278~~540.4364
Current Net Deferred Interest										0.00		0.00		0.00
Cumulative Net Deferred Interest										0.00		0.00		0.00
Page 13 of 29
Page 13 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Delinquency Report
	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				4227,~~867~~954,~~655~~508.8423		03,917,470.0081		01,217,412.0084		4233,~~867~~089,~~655~~391.8488
			% Balance				1.7919%		0.0017%		0.0005%		1.7941%
			# Loans				~~117~~93		019		04		~~117~~116
			% # Loans				1.5929%		0.0026%		0.0006%		1.5961%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		01,270,203.0056		0.00		0238,155.0090		0.00		01,508,359.0046
			% Balance		0.0005%		0.00%		0.0001%		0.00%		0.0006%
			# Loans		04		0		01		0		05
			% # Loans		0.0006%		0.00%		0.0001%		0.00%		0.0007%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		01,270,203.0056		4227,~~867~~954,~~655~~508.8423		04,155,626.0071		01,217,412.0084		4234,~~867~~597,~~655~~751.8434
			% Balance		0.0005%		1.7919%		0.0018%		0.0005%		1.7947%
			# Loans		04		~~117~~93		020		04		~~117~~121
			% # Loans		0.0006%		1.5929%		0.0028%		0.0006%		1.5968%
Page 14 of 29
Page 14 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
	GROUP 1
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				1415,~~038~~419,~~963~~072.4696		03,535,796.0063		0715,725.0091		1419,~~038~~670,~~963~~595.4650
			% Balance				1.2438%		0.0032%		0.0006%		1.2476%
			# Loans				6267		018		03		6288
			% # Loans				1.2841%		0.0038%		0.0006%		1.2885%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		0661,496.0034		0.00		0238,155.0090		0.00		0899,652.0024
			% Balance		0.0006%		0.00%		0.0002%		0.00%		0.0008%
			# Loans		03		0		01		0		04
			% # Loans		0.0006%		0.00%		0.0002%		0.00%		0.0008%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		0661,496.0034		1415,~~038~~419,~~963~~072.4696		03,773,952.0053		0715,725.0091		1420,~~038~~570,~~963~~247.4674
			% Balance		0.0006%		1.2438%		0.0034%		0.0006%		1.2484%
			# Loans		03		6267		019		03		6292
			% # Loans		0.0006%		1.2841%		0.0040%		0.0006%		1.2894%
Page 15 of 29
Page 15 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
	GROUP 2
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				2812,~~828~~535,~~692~~435.3827		0381,674.0018		0501,686.0093		2813,~~828~~418,~~692~~796.38
			% Balance				21.2902%		0.0003%		0.0004%		21.2909%
			# Loans				5526		01		01		5528
			% # Loans				21.1705%		0.0004%		0.0004%		21.1713%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		0608,707.0022		0.00		0.00		0.00		0608,707.0022
			% Balance		0.0005%		0.00%		0.00%		0.00%		0.0005%
			# Loans		01		0		0		0		01
			% # Loans		0.0004%		0.00%		0.00%		0.00%		0.0004%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		0608,707.0022		2812,~~828~~535,~~692~~435.3827		0381,674.0018		0501,686.0093		2814,~~828~~027,~~692~~503.3860
			% Balance		0.0005%		21.2902%		0.0003%		0.0004%		21.2914%
			# Loans		01		5526		01		01		5529
			% # Loans		0.0004%		21.1705%		0.0004%		0.0004%		21.17%
Page 16 of 29
Page 16 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
REO Report
Loan Number			Original		Stated				Current		State &
														First
&			Principal		Principal		Paid to		Note		LTV at		Original		Payment
Loan Group			Balance		Balance		Date		Rate		Origination		Term		Date
TOTAL
Page 17 of 29
Page 17 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Foreclosure Report
Loan Number			Original		Stated				Current		State &
														First
&			Principal		Principal		Paid to		Note		LTV at		Original		Payment
Loan Group			Balance		Balance		Date		Rate		Origination		Term		Date
TOTAL
Page 18 of 29
Page 18 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Prepayment Report
VOLUNTARY PREPAYMENTS
											Group 2		Group 1		Total
Current
Number of Paid in Full Loans										2331		3854		6185
Number of Repurchased Loans										20		41		61
Total Number of Loans Prepaid in Full										2531		4255		6786
Curtailments Amount										(21,~~423~~551,~~123~~844.1761)		(1,~~930~~577,~~440~~555.5820)		(43,~~353~~129,~~563~~399.7581)
Paid in Full Balance										1216,~~093~~220,~~408~~104.1968		912,~~116~~304,~~361~~534.0312		2128,~~209~~524,~~769~~638.2280
Repurchased Loans Balance										~~1,011,000~~0.00		1244,~~134,237~~040.1130		2244,~~145,237~~040.1130
Total Prepayment Amount										1014,~~681~~668,~~285~~260.0207		810,~~320~~971,~~157~~019.5622		1925,~~001~~639,~~442~~279.5829
Cumulative
Number of Paid in Full Loans										2382		38122		61204
Number of Repurchased Loans										2		45		67
Total Number of Loans Prepaid in Full										2584		42127		67211
Paid in Full Balance										1243,~~093~~082,~~408~~622.1910		928,~~116~~571,~~361~~389.0368		2171,~~209~~654,~~769~~011.2278
Repurchased Loans Balance										1,011,000.00		1,~~134~~378,~~237~~277.1141		2,~~145~~389,~~237~~277.1141
Curtailments Amount										(25,~~423~~279,~~123~~734.1793)		(14,~~930~~944,~~440~~164.5866)		(410,~~353~~223,~~563~~899.7559)
Total Prepayment Amount										1038,~~681~~813,~~285~~887.0217		825,~~320~~005,~~157~~502.5643		1963,~~001~~819,~~442~~389.5860
Page 19 of 29
Page 19 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
VOLUNTARY PREPAYMENTS RATES
											Group 2		Group 1		Total
SMM										01.8418%		0.7397%		01.7908%
3 Months Avg SMM										01.8403%		0.73%		0.7989%
12 Months Avg SMM										01.8403%		0.73%		0.7989%
Avg SMM Since Cut-off										01.8403%		0.73%		0.7989%
CPR										913.6627%		811.3906%		912.0622%
3 Months Avg CPR										911.6670%		8.3947%		910.0618%
12 Months Avg CPR										911.6670%		8.3947%		910.0618%
Avg CPR Since Cut-off										911.6670%		8.3947%		910.0618%
PSA										1,~~919~~471.5785%		1,~~843~~293.3168%		1,~~885~~390.7721%
3 Months Avg PSA Approximation										1,~~919~~665.5745%		1,~~843~~292.3058%		1,~~885~~496.7785%
12 Months Avg PSA Approximation										1,~~919~~665.5745%		1,~~843~~292.3058%		1,~~885~~496.7785%
Avg PSA Since Cut-off Approximation										1,~~919~~665.5745%		1,~~843~~292.3058%		1,~~885~~496.7786%
Page 20 of 29
Page 20 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
PREPAYMENT CALCULATION METHODOLOGY
Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases + Liquidations )/(Beg Principal Balance - Sched Principal) Conditional Prepayment Rate (CPR): 1-((1-SMM)^12) PSA Standard Prepayment Model: CPR/(0.002min(30,WAS)) Average SMM over period between nth month and mth month (AvgSMMn,m): [(1-SMMn)(1-SMMn+1)...(1-SMMm)]^(1/months in period n,m) Conditional Prepayment Rate (CPR): 1-((1-SMM)^12) Average PSA Approximation over period between the nth month and mth month: AvgCPRn,m/(0.002*Avg WASn,m)) Average WASn,m: (min(30,WASn)+min(30,WASn+1)+...+min(30,WASm)/(number of months in the period n,m) Weighted Average Seasoning (WAS) Dates correspond to distribution dates. Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments, liquidations, and repurchases.
Page 21 of 29
Page 21 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Prepayment Detail Report
Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution
Loan Number			Original							Current		State &		Type Prepayment		First
&		Loan	Principal		Prepayment			Prepayment		Note		LTV at		&		Payment
Loan Group		Status	Balance		Amount			Date		Rate		Origination		Original Term		Date
120397814 2			496,000.00		494,893.84			01-Oct-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121017514 2			463,875.00		464,925.27			16-Nov-2005		6.013%		CA - 75.00%		Paid Off - 360		01-Aug-2005
120397854 2			576,000.00		575,036.46			07-Oct-2005		5.750%		NV - 90.00%		Paid Off - 360		01-Apr-2005
121035759 1			225,000.00		225,792.68			01-Dec-2005		6.113%		CA - 75.00%		Paid Off - 360		01-May-2005
121064646 1			263,012.00		262,385.23			08-Sep-2005		5.815%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121204640 1			250,000.00		250,402.35			16-Nov-2005		6.263%		NJ - 56.18%		Paid Off - 360		01-Jul-2005
121170868 1			168,000.00		167,238.53			29-Sep-2005		5.715%		MD - 80.00%		Paid Off - 360		01-Jun-2005
121303534 2			485,500.00		487,663.39			05-Dec-2005		5.875%		CA - 79.59%		Paid Off - 360		01-Jun-2005
121257392 2			646,800.00		646,785.44			07-Sep-2005		5.625%		CA - 71.87%		Paid Off - 360		01-May-2005
121303910 1			255,000.00		255,993.58			15-Dec-2005		6.663%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121303521 2			368,750.00		368,121.48			06-Sep-2005		5.375%		CA - 79.99%		Paid Off - 360		01-Jun-2005
121330330 1			275,000.00		275,243.22			15-Dec-2005		6.413%		CA - 50.00%		Paid Off - 360		01-Sep-2005
121390678 2			616,000.00		614,532.03			07-Oct-2005		5.765%		CA - 70.00%		Paid Off - 360		01-Sep-2005
121331475 1			201,000.00		201,177.75			15-Dec-2005		6.413%		CA - 60.00%		Paid Off - 360		01-Sep-2005
121405425 1			341,600.00		340,559.93			23-Sep-2005		6.015%		CA - 70.00%		Paid Off - 360		01-Aug-2005
121331701 1			330,000.00		330,291.86			15-Dec-2005		6.413%		CA - 60.00%		Paid Off - 360		01-Sep-2005
121406587 1			224,000.00		223,247.41			06-Sep-2005		6.215%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121343912 1			178,500.00		178,253.93			29-Nov-2005		5.763%		IL - 70.83%		Paid Off - 360		01-Aug-2005
121414813 1			150,000.00		149,485.92			30-Sep-2005		5.865%		VT - 78.13%		Paid Off - 360		01-Aug-2005
121353907 1			255,000.00		255,671.08			15-Dec-2005		6.163%		IL - 76.12%		Paid Off - 360		01-Aug-2005
121417847 1			226,500.00		225,734.74			07-Oct-2005		6.115%		VA - 75.00%		Paid Off - 360		01-Aug-2005
121387006 2			397,600.00		398,799.66			01-Dec-2005		6.313%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121418657 1			337,600.00		336,902.87			30-Sep-2005		5.915%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121397867 1			307,200.00		307,478.12			14-Dec-2005		6.063%		MA - 80.00%		Paid Off - 360		01-Sep-2005
121419599 1			157,500.00		156,967.86			12-Sep-2005		6.115%		NJ - 75.00%		Paid Off - 360		01-Aug-2005
121403422 1			391,575.00		392,559.87			16-Nov-2005		6.113%		HI - 75.00%		Paid Off - 360		01-Aug-2005
121425743 2			650,000.00		647,759.34			12-Oct-2005		5.765%		CA - 73.91%		Paid Off - 360		01-Aug-2005
121417623 1			258,750.00		259,660.70			06-Dec-2005		6.513%		NY - 75.00%		Paid Off - 360		01-Aug-2005
121440310 2			650,000.00		648,387.71			14-Oct-2005		5.365%		CA - 73.45%		Paid Off - 360		01-Jul-2005
121436783 2			400,000.00		400,991.15			06-Dec-2005		6.113%		CA - 56.90%		Paid Off - 360		01-Aug-2005
121447443 1			506,200.00		504,489.71			06-Oct-2005		6.115%		HI - 74.99%		Paid Off - 360		01-Aug-2005
121462801 2			412,000.00		412,338.66			22-Nov-2005		6.013%		NY - 80.00%		Paid Off - 360		01-Sep-2005
121452561 1			150,000.00		149,495.14			07-Oct-2005		6.215%		CA - 65.22%		Paid Off - 360		01-Aug-2005
121468443 2			610,000.00		611,457.69			05-Dec-2005		6.063%		CA - 67.78%		Paid Off - 360		01-Aug-2005
121469643 1			101,000.00		100,502.71			19-Sep-2005		5.715%		NJ - 15.42%		Paid Off - 360		01-Aug-2005
121468476 1			217,250.00		217,314.80			21-Nov-2005		5.663%		AZ - 89.99%		Paid Off - 360		01-Aug-2005
121471096 2			539,500.00		537,629.31			23-Sep-2005		5.665%		CA - 65.00%		Paid Off - 360		01-Aug-2005
121477179 1			183,400.00		183,541.04			13-Dec-2005		6.413%		CA - 70.00%		Paid Off - 360		01-Aug-2005
121476978 1			350,000.00		348,789.96			09-Sep-2005		5.715%		CA - 37.84%		Paid Off - 360		01-Aug-2005
121485216 2			400,000.00		400,955.84			02-Dec-2005		6.063%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121480998 1			192,000.00		191,351.29			06-Oct-2005		6.115%		FL - 80.00%		Paid Off - 360		01-Aug-2005
121495693 1			162,000.00		162,241.26			23-Nov-2005		6.413%		MA - 75.88%		Paid Off - 360		01-Sep-2005
121505763 1			159,600.00		159,060.76			09-Sep-2005		6.115%		NV - 77.85%		Paid Off - 360		01-Aug-2005
121497981 2			648,000.00		647,479.40			21-Nov-2005		5.913%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121507094 2			392,000.00		390,668.04			26-Sep-2005		6.015%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121503645 1			138,400.00		138,684.42			06-Dec-2005		6.363%		FL - 80.00%		Paid Off - 360		01-Aug-2005
121507640 1			66,500.00		66,454.48			07-Oct-2005		6.040%		FL - 36.94%		Paid Off - 360		01-Aug-2005
121510907 1			219,000.00		219,438.62			22-Nov-2005		6.213%		FL - 56.88%		Paid Off - 360		#######
121514620 1			298,000.00		296,993.15			05-Oct-2005		6.115%		CA - 79.47%		Paid Off - 360		01-Aug-2005
121513775 1			322,200.00		322,456.19			22-Nov-2005		6.000%		VA - 90.00%		Paid Off - 360		01-May-2005
121519110 1			348,000.00		346,810.76			29-Sep-2005		5.915%		FL - 80.00%		Paid Off - 360		01-Aug-2005
121516724 1			236,200.00		236,640.87			12-Dec-2005		5.863%		CA - 70.51%		Paid Off - 360		01-Aug-2005
121522805 2			500,000.00		498,320.11			05-Oct-2005		6.215%		CA - 71.43%		Paid Off - 360		01-Aug-2005
121518026 2			450,000.00		451,131.80			05-Dec-2005		6.113%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121523183 1			217,000.00		216,804.40			15-Sep-2005		5.915%		AZ - 74.83%		Paid Off - 360		01-Aug-2005
121522244 1			131,300.00		131,335.15			13-Dec-2005		6.063%		FL - 89.99%		Paid Off - 360		01-Sep-2005
121531777 1			235,200.00		234,916.81			07-Oct-2005		5.565%		AZ - 70.00%		Paid Off - 360		01-Aug-2005
121523692 1			225,000.00		225,509.43			22-Nov-2005		6.013%		CA - 56.96%		Paid Off - 360		01-Aug-2005
121532063 1			149,000.00		148,477.18			20-Sep-2005		5.465%		UT - 78.42%		Paid Off - 360		01-Aug-2005
121529994 2			444,000.00		445,228.19			02-Dec-2005		6.213%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121563792 2			520,000.00		518,909.21			01-Sep-2005		5.740%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121532061 1			180,200.00		179,768.99			14-Dec-2005		6.213%		CA - 61.50%		Paid Off - 360		01-Aug-2005
121568598 1			156,000.00		155,628.24			29-Sep-2005		6.115%		AZ - 80.00%		Paid Off - 360		01-Sep-2005
121532181 1			174,600.00		175,039.16			09-Dec-2005		6.113%		WA - 80.00%		Paid Off - 360		01-Aug-2005
121573402 1			300,000.00		298,986.40			23-Sep-2005		6.115%		AZ - 68.99%		Paid Off - 360		01-Aug-2005
121537252 2			1,000,000.00		1,000,488.38			02-Dec-2005		5.813%		CA - 66.67%		Paid Off - 360		01-Sep-2005
121579147 2			548,000.00		546,694.08			05-Oct-2005		4.865%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121538997 2			583,000.00		584,685.87			22-Nov-2005		6.263%		CA - 74.74%		Paid Off - 360		01-Aug-2005
121582610 1			328,000.00		328,000.00			28-Sep-2005		1.000%		VA - 80.00%		Paid Off - 360		01-Oct-2005
121544385 2			508,000.00		509,596.55			02-Dec-2005		6.363%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121583576 2			412,500.00		411,094.38			19-Sep-2005		5.965%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121545258 1			250,000.00		248,967.73			01-Dec-2005		6.413%		MD - 79.11%		Paid Off - 360		01-Aug-2005
121589302 1			160,000.00		159,618.71			13-Oct-2005		5.915%		IL - 80.00%		Paid Off - 360		01-Sep-2005
121546901 1			273,750.00		274,575.96			16-Nov-2005		6.313%		VA - 75.00%		Paid Off - 360		01-Aug-2005
Page 22 of 29
121548019 1			213,750.00		214,243.56			16-Nov-2005		6.513%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121551139 2			399,000.00		400,103.72			02-Dec-2005		6.213%		CA - 58.94%		Paid Off - 360		01-Aug-2005
121565102 2			408,000.00		408,471.49			22-Nov-2005		6.213%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121568260 1			218,400.00		219,086.40			30-Nov-2005		6.363%		CA - 80.00%		Paid Off - 360		01-Aug-2005
Page 22 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution
Loan Number			Original							Current		State &		Type Prepayment		First
&		Loan	Principal		Prepayment			Prepayment		Note		LTV at		&		Payment
Loan Group		Status	Balance		Amount			Date		Rate		Origination		Original Term		Date
121592542 2			564,000.00		562,654.83			26-Aug-2005		5.765%		NJ - 80.00%		Paid Off - 360		01-Aug-2005
121573555 1			121,680.00		121,970.78			16-Nov-2005		6.063%		FL - 71.58%		Paid Off - 360		01-Aug-2005
121596481 1			192,000.00		191,340.07			07-Sep-2005		5.815%		NM - 80.00%		Paid Off - 360		01-Aug-2005
121579518 1			306,000.00		306,758.57			16-Nov-2005		6.163%		NV - 80.00%		Paid Off - 360		01-Aug-2005
121604549 2			390,000.00		389,070.61			11-Oct-2005		5.615%		CA - 65.00%		Paid Off - 360		01-Sep-2005
121580254 2			600,000.00		597,930.46			21-Nov-2005		6.213%		CA - 48.39%		Paid Off - 360		01-Aug-2005
121610353 2			400,000.00		399,046.78			11-Oct-2005		5.765%		CA - 72.07%		Paid Off - 360		01-Sep-2005
121589389 1			180,368.00		178,895.17			08-Dec-2005		6.013%		NV - 65.00%		Paid Off - 360		01-Oct-2005
121615550 1			92,800.00		92,611.66			03-Oct-2005		5.865%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121592890 2			410,000.00		411,134.13			18-Nov-2005		6.213%		CA - 68.33%		Paid Off - 360		01-Aug-2005
121616526 1			164,000.00		163,609.18			02-Sep-2005		5.465%		MI - 69.79%		Paid Off - 360		01-Aug-2005
121594737 1			213,750.00		214,252.82			21-Nov-2005		6.613%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121622073 1			350,000.00		348,789.96			03-Oct-2005		5.715%		CA - 67.31%		Paid Off - 360		01-Aug-2005
121597304 1			296,500.00		297,394.62			02-Dec-2005		6.313%		CA - 74.13%		Paid Off - 360		01-Aug-2005
121627321 2			600,000.00		597,943.67			15-Sep-2005		5.865%		CA - 70.59%		Paid Off - 360		01-Aug-2005
121598556 1			173,400.00		173,528.08			06-Dec-2005		5.963%		FL - 66.69%		Paid Off - 360		01-Sep-2005
121635603 2			479,200.00		478,058.04			19-Sep-2005		5.665%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121600727 1			248,800.00		249,431.74			01-Dec-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121675032 1			263,000.00		262,373.25			07-Oct-2005		5.915%		CA - 73.06%		Paid Off - 360		01-Sep-2005
121601127 1			110,000.00		110,304.30			16-Nov-2005		6.213%		CA - 47.83%		Paid Off - 360		01-Aug-2005
121693198 2			576,000.00		574,040.05			30-Aug-2005		5.990%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121613720 2			375,000.00		375,601.21			02-Dec-2005		6.413%		CA - 72.12%		Paid Off - 360		01-Aug-2005
121708502 2			450,000.00		448,927.62			14-Oct-2005		5.765%		MA - 64.75%		Paid Off - 360		01-Sep-2005
121627335 2			650,000.00		650,018.35			07-Dec-2005		6.413%		CA - 73.28%		Paid Off - 61		01-Aug-2005
121716268 1			336,400.00		335,598.34			30-Sep-2005		5.815%		CA - 79.99%		Paid Off - 360		01-Sep-2005
121627404 1			340,000.00		340,336.20			23-Nov-2005		6.113%		MA - 56.67%		Paid Off - 360		01-Sep-2005
121717126 2			600,000.00		597,881.91			07-Oct-2005		5.375%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121628462 2			470,400.00		470,551.30			02-Dec-2005		5.713%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121717131 1			341,000.00		339,807.04			03-Oct-2005		5.500%		CA - 56.83%		Paid Off - 360		01-Aug-2005
121632731 1			98,800.00		98,897.69			12-Dec-2005		6.113%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121717695 2			500,000.00		498,502.24			29-Sep-2005		6.375%		VA - 75.73%		Paid Off - 360		01-Aug-2005
121635783 1			274,400.00		274,213.76			05-Dec-2005		6.063%		CA - 80.00%		Paid Off - 360		01-Oct-2005
121723078 1			229,600.00		228,852.46			05-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121638679 2			468,000.00		468,462.77			14-Dec-2005		6.113%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121723687 2			650,000.00		648,451.01			29-Aug-2005		5.875%		OR - 75.00%		Paid Off - 360		01-Sep-2005
121657101 2			414,400.00		414,636.96			16-Nov-2005		5.863%		CA - 70.00%		Paid Off - 360		01-Sep-2005
121752343 1			352,000.00		350,864.00			22-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121662956 1			150,000.00		149,558.42			29-Nov-2005		6.313%		FL - 62.50%		Paid Off - 360		01-Sep-2005
121760461 1			359,000.00		358,144.48			14-Sep-2005		5.965%		CA - 73.27%		Paid Off - 360		01-Sep-2005
121672032 1			232,000.00		231,861.35			01-Dec-2005		6.563%		AZ - 80.00%		Paid Off - 360		01-Oct-2005
121780385 1			159,000.00		156,940.19			22-Sep-2005		5.940%		CA - 46.77%		Paid Off - 360		01-Apr-2005
121674638 1			100,000.00		99,761.69			01-Dec-2005		6.013%		NJ - 29.41%		Paid Off - 360		01-Sep-2005
121809077 1			185,000.00		184,362.28			30-Sep-2005		5.765%		CA - 50.69%		Paid Off - 360		01-Aug-2005
121682194 2			433,600.00		434,173.41			13-Dec-2005		6.313%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121832231 1			185,000.00		185,000.00			06-Oct-2005		1.000%		FL - 64.91%		Paid Off - 360		01-Oct-2005
121693210 2			820,000.00		815,847.31			22-Nov-2005		6.013%		CA - 64.98%		Paid Off - 360		01-Aug-2005
121846455 1			350,000.00		349,165.93			05-Oct-2005		5.865%		NY - 71.43%		Paid Off - 360		01-Sep-2005
121697346 1			288,000.00		288,274.39			14-Dec-2005		6.113%		AZ - 80.00%		Paid Off - 360		01-Sep-2005
121608558 1			160,000.00		159,237.11			30-Sep-2005		5.915%		CA - 46.38%		Repur/Subs - 360		01-Aug-2005
121698725 1			240,000.00		240,136.64			09-Dec-2005		6.213%		CA - 78.69%		Paid Off - 360		01-Sep-2005
121706248 2			375,000.00		375,000.00			30-Sep-2005		1.000%		NJ - 71.43%		Repur/Subs - 360		01-Oct-2005
121702427 1			320,000.00		319,681.73			16-Nov-2005		6.413%		CA - 63.37%		Paid Off - 360		01-Oct-2005
121713538 1			343,000.00		343,000.00			30-Sep-2005		1.000%		CA - 51.97%		Repur/Subs - 360		01-Oct-2005
121705431 1			353,500.00		353,318.96			05-Dec-2005		6.413%		CA - 70.00%		Paid Off - 360		01-Oct-2005
121814586 1			320,000.00		320,000.00			30-Sep-2005		2.000%		HI - 49.23%		Repur/Subs - 360		01-Oct-2005
121707640 1			160,000.00		160,184.91			30-Nov-2005		6.213%		NJ - 56.14%		Paid Off - 360		01-Sep-2005
121851481 1			312,000.00		312,000.00			30-Sep-2005		1.000%		NJ - 52.00%		Repur/Subs - 360		01-Oct-2005
121717132 1			234,000.00		234,493.16			21-Nov-2005		6.125%		CA - 52.00%		Paid Off - 360		01-Aug-2005
121861461 2			636,000.00		636,000.00			30-Sep-2005		1.000%		FL - 80.00%		Repur/Subs - 360		01-Oct-2005
121717704 2			592,000.00		593,785.07			01-Dec-2005		6.375%		CA - 80.00%		Paid Off - 360		01-Aug-2005
TOTAL			23,414,262.00		23,355,006.33
121723098 2			450,000.00		449,254.68			08-Dec-2005		6.000%		CA - 75.00%		Paid Off - 360		01-Aug-2005
Page 23 of 29
121761776 2			578,000.00		578,075.92			29-Nov-2005		5.663%		CA - 77.07%		Paid Off - 360		01-Aug-2005
121771133 1			241,600.00		241,818.74			17-Nov-2005		6.063%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121781430 1			262,700.00		262,894.02			18-Nov-2005		5.963%		MD - 42.10%		Paid Off - 360		01-Sep-2005
121783075 2			483,300.00		483,434.45			06-Dec-2005		6.063%		AZ - 90.00%		Paid Off - 360		01-Sep-2005
121794134 1			180,000.00		179,888.00			30-Nov-2005		6.413%		FL - 79.65%		Paid Off - 360		01-Oct-2005
121809957 2			441,600.00		441,300.28			06-Dec-2005		6.063%		CA - 80.00%		Paid Off - 360		01-Oct-2005
121826265 1			166,500.00		166,647.25			23-Nov-2005		5.463%		ME - 60.77%		Paid Off - 360		01-Aug-2005
121828452 2			520,000.00		517,297.72			13-Dec-2005		5.663%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121828478 2			900,000.00		894,283.60			02-Dec-2005		6.263%		CA - 75.00%		Paid Off - 360		01-Sep-2005
121830735 1			345,000.00		345,438.59			29-Nov-2005		6.250%		CA - 79.49%		Paid Off - 360		01-Sep-2005
121836338 1			140,000.00		139,899.18			12-Dec-2005		6.163%		VA - 80.00%		Paid Off - 360		01-Oct-2005
121837212 1			178,000.00		177,871.78			13-Dec-2005		6.013%		MD - 68.46%		Paid Off - 360		01-Oct-2005
Page 23 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution
Loan Number			Original							Current		State &		Type Prepayment		First
&		Loan	Principal		Prepayment			Prepayment		Note		LTV at		&		Payment
Loan Group		Status	Balance		Amount			Date		Rate		Origination		Original Term		Date
121879155 1			265,600.00		265,452.86			06-Dec-2005		6.213%		NY - 80.00%		Paid Off - 360		01-Oct-2005
121583911 1			243,750.00		244,040.30			30-Nov-2005		6.263%		CA - 75.00%		Repur/Subs - 360		01-Sep-2005
TOTAL			28,752,098.00		28,768,679.10
Page 24 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
December 27, 2005 Distribution
Realized Loss Report
COLLATERAL REALIZED LOSSES
											Group 2		Group 1		Total
Current
Number of Loans Liquidated										0		0		0
Collateral Principal Realized Loss/(Gain) Amount										0.00		0.00		0.00
Collateral Interest Realized Loss/(Gain) Amount										0.00		0.00		0.00
Net Liquidation Proceeds										0.00		0.00		0.00
Cumulative
Number of Loans Liquidated										0		0		0
Collateral Realized Loss/(Gain) Amount										0.00		0.00		0.00
Net Liquidation Proceeds										0.00		0.00		0.00
Page 24 of 29
Page 25 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
DEFAULT SPEEDS
											Group 2		Group 1		Total
MDR										0.00%		0.00%		0.00%
3 Months Avg MDR										0.00%		0.00%		0.00%
12 Months Avg MDR										0.00%		0.00%		0.00%
Avg MDR Since Cut-off										0.00%		0.00%		0.00%
CDR										0.00%		0.00%		0.00%
3 Months Avg CDR										0.00%		0.00%		0.00%
12 Months Avg CDR										0.00%		0.00%		0.00%
Avg CDR Since Cut-off										0.00%		0.00%		0.00%
SDA										0.00%		0.00%		0.00%
3 Months Avg SDA Approximation										0.00%		0.00%		0.00%
12 Months Avg SDA Approximation										0.00%		0.00%		0.00%
Avg SDA Since Cut-off Approximation										0.00%		0.00%		0.00%
Loss Severity Approximation for Current Period										0.00%		0.00%		0.00%
3 Months Avg Loss Severity Approximation										0.00%		0.00%		0.00%
12 Months Avg Loss Severity Approximation										0.00%		0.00%		0.00%
Avg Loss Severity Approximation Since Cut-off										0.00%		0.00%		0.00%
Page 25 of 29
Page 26 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
COLLATERAL REALIZED LOSS CALCULATION METHODOLOGY
	Monthly Default Rate (MDR): (Beg Principal Balance of Liquidated Loans)/(Total Beg Principal Balance)
	Conditional Default Rate (CDR): 1-((1-MDR)^12)
	SDA Standard Default Assumption: CDR/IF(WAS<61,MIN(30,WAS)0.02,MAX(0.03,MIN(30,WAS)0.02-0.0095*(WAS-60)))
	Average MDR over period between nth month and mth month (AvgMDRn,m): [(1-MDRn)(1-MDRn+1)...*(1-MDRm)]^(1/months in period n,m)
	Average CDR over period between the nth month and mth month (AvgCDRn,m): 1-((1-AvgMDRn,m)^12)
	Average SDA Approximation over period between the nth month and mth month:
	AvgCDRn,m/IF(Avg WASn,m<61,MIN(30,Avg WASn,m)0.02,MAX(0.03,MIN(30,Avg WASn,m)0.02-0.0095*(Avg WASn,m-60)))
	Average WASn,m: (WASn + WASn+1 +...+ WASm )/(number of months in the period n,m)
	Loss Severity Approximation for current period: sum(Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)
	Average Loss Severity Approximation over period between nth month and mth month: Avg(Loss Severityn,m)
	Note: Default rates are calculated since deal issue date and include realized gains and additional realized losses and gains from prior periods.
	Dates correspond to distribution dates.
Page 26 of 29
Page 27 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Realized Loss Detail Report
Loan Number			Current		State &				Prior		Realized				Cumulative
&		Loan	Note		LTV at		Original		Principal		Loss/(Gain)		Realized		Realized
Loan Group		Status	Rate		Origination		Term		Balance		Revision		Loss/(Gain)		Loss/(Gain)
TOTAL
Page 27 of 29
Page 28 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
										Group 2		Group 1		Total
						Has Optional Termination Date Reached (0=No,1=Yes)								0
						Has Sr. Prepay Stepdown Condition Occurred								0
						Has Sr. Credit Supp. Depletion Date Occured								0
ADJUSTABLE RATE CERTIFICATE INFORMATION
SPACE INTENTIONALLY LEFT BLANK
ADDITIONAL INFORMATION
										Group 2		Group 1		Total
Current Senior Percentage										91.~~749968~~596470%		91.~~749949~~655698%		91.~~749959~~624659%
Next Senior Percentage										91.~~686493~~496152%		91.~~697712~~575653%		91.~~691817~~534031%
Current Subordinate Percentage										8.~~250032~~403530%		8.~~250051~~344302%		8.~~250041~~375341%
Next Subordinate Percentage										8.~~313507~~503848%		8.~~302288~~424347%		8.~~308183~~465969%
Senior Prepayment Percentage										100.000000%		100.000000%		100.000000%
Next Senior Prepayment Percentage										100.000000%		100.000000%		100.000000%
Subordinate Prepayment Percentage										0.000000%		0.000000%		0.000000%
Next Subordinate Prepayment Percentage										0.000000%		0.000000%		0.000000%
Page 28 of 29
Page 29 of 30
IndyMac INDX Mortgage Loan Trust 2005-AR18
Mortgage Pass-Through Certificates
2005-AR18
October 25, 2005 Distribution
December 27, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
										Group 2		Group 1		Total
Current Scheduled Payments										56,~~778~~266,~~296~~771.9394		5,~~233~~843,~~539~~686.6113		1112,~~011~~110,~~836~~458.5308
Current Scheduled Payments 1 Month Prior										06,178,624.0024		05,737,674.0049		011,916,298.0073
Current Scheduled Payments 2 Month Prior										05,778,296.0093		05,233,539.0061		011,011,836.0053
Current Scheduled Payments 3 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 4 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 5 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 6 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 7 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 8 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 9 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 10 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 11 Month Prior										0.00		0.00		0.00
1-A-1 Carryforward Amount Paid
1-A-2 Carryforward Amount Paid
1-A-3A Carryforward Amount Paid
1-A-3B Carryforward Amount Paid
2-A-1A Carryforward Amount Paid
2-A-1B Carryforward Amount Paid
2-A-2A Carryforward Amount Paid
2-A-2B Carryforward Amount Paid
2-A-2C Carryforward Amount Paid
2-A-3A Carryforward Amount Paid
2-A-3B Carryforward Amount Paid
B-1 Carryforward Amount Paid
B-2 Carryforward Amount Paid
B-3 Carryforward Amount Paid
B-4 Carryforward Amount Paid
B-5 Carryforward Amount Paid
B-6 Carryforward Amount Paid
B-7 Carryforward Amount Paid
B-8 Carryforward Amount Paid
B-9 Carryforward Amount Paid
B-10 Carryforward Amount Paid
B-11 Carryforward Amount Paid
Page 29 of 29
Page 30 of 30

Filing Compare · INDYMAC INDX MORTGAGE LOAN TRUST 2005-AR18