
                                       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 25, 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 25, 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 28, 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 25, 2005.



IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

				External Parties						Table of Contents

													Page
				Seller									Page
				Seller						1. Certificate Payment Report					2
				IndyMac Bank						1. Certificate Payment Report					2
				IndyMac Bank						2. Collection Account Report					8
										2. Collection Account Report					8
										3. Credit Enhancement Report					10
										4. Collateral Report					11
				Certificate Insurer(s)						5. Delinquency Report					14
				Certificate Insurer(s)						5. Delinquency Report					14
										6. REO Report					17

										7. Foreclosure Report					18
										8. Prepayment Report					19
										9. Prepayment Detail Report					22
										9. Prepayment Detail Report					22
										10. Realized Loss Report					24
										11. Realized Loss Detail Report					27
				Servicer(s)						11. Realized Loss Detail Report					27
				Servicer(s)						12. Triggers and Adj. Cert. Report					28
				IndyMac Bank						12. Triggers and Adj. Cert. Report					28
				IndyMac Bank						13. Other Related Information					29
										13. Other Related Information					29


				Underwriter(s)
				Goldman Sachs & Co.


										Total Number of Pages					29
										Total Number of Pages

				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
										Brent.Hoyler@db.com
										Address:
										1761 East St. Andrew Place, Santa Ana, CA 92705
				Distribution Date:			October 25, 2005
										Factor Information:			(800) 735-7777
				Record Date:			September 30, 2005			Factor Information:			(800) 735-7777
										Main Phone Number:			(714) 247-6000

							October 24, 2005
							October 24, 2005

										https://www.tss.db.com/invr






Page 1 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Certificate Payment Report
Current Period Distribution - REMIC IV
					Prior												Current
	Class		Original		Principal						Total		Realized		Deferred		Principal
	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		629,654,000.00		3,357,634.15		5,237,814.46		8,595,448.61		0.00		0.00		624,416,185.54
1-A-1	FLT	$	629,654,000.00		629,654,000.00		3,357,634.15		5,237,814.46		8,595,448.61		0.00		0.00		624,416,185.54
1-A-2	FLT	$	262,356,000.00		262,356,000.00		1,573,919.12		2,182,424.08		3,756,343.20		0.00		0.00		260,173,575.92
1-A-3A	FLT	$	77,413,000.00		77,413,000.00		426,223.59		643,964.67		1,070,188.26		0.00		0.00		76,769,035.33
1-A-3B	FLT	$	80,000,000.00		80,000,000.00		429,800.53		665,484.79		1,095,285.32		0.00		0.00		79,334,515.21
2-A-1A	FLT	$	398,032,000.00		398,032,000.00		2,122,508.29		3,761,613.20		5,884,121.49		0.00		0.00		394,270,386.80
2-A-1B	FLT	$	300,000,000.00		300,000,000.00		1,787,752.00		2,835,158.88		4,622,910.88		0.00		0.00		297,164,841.12
2-A-2A	FLT	$	50,000,000.00		50,000,000.00		271,292.00		472,526.48		743,818.48		0.00		0.00		49,527,473.52
2-A-2B	FLT	$	65,846,000.00		65,846,000.00		234,027.66		622,279.57		856,307.23		0.00		0.00		65,223,720.43
2-A-2C	FLT	$	175,000,000.00		175,000,000.00		1,003,188.67		1,653,842.68		2,657,031.35		0.00		0.00		173,346,157.32
2-A-3A	FLT	$	84,508,000.00		84,508,000.00		465,287.53		798,645.36		1,263,932.89		0.00		0.00		83,709,354.64
2-A-3B	FLT	$	90,000,000.00		90,000,000.00		483,525.60		850,547.66		1,334,073.26		0.00		0.00		89,149,452.34
1-X	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
A-R	R	$	100.00		100.00		0.95		100.00		100.95		0.00		0.00		0.00
B-1	SUB	$	12,201,000.00		12,201,000.00		69,454.28		15,814.68		85,268.96		0.00		0.00		12,185,185.32
B-2	SUB	$	49,300,000.00		49,300,000.00		283,927.25		63,901.63		347,828.88		0.00		0.00		49,236,098.37
B-3	SUB	$	33,764,000.00		33,764,000.00		205,707.39		43,764.19		249,471.58		0.00		0.00		33,720,235.81
B-4	SUB	$	14,470,000.00		14,470,000.00		89,316.17		18,755.71		108,071.88		0.00		0.00		14,451,244.29
B-5	SUB	$	13,264,000.00		13,264,000.00		84,348.08		17,192.52		101,540.60		0.00		0.00		13,246,807.48
B-6	SUB	$	10,853,000.00		10,853,000.00		71,476.12		14,067.43		85,543.55		0.00		0.00		10,838,932.57
B-7	SUB	$	9,647,000.00		9,647,000.00		63,533.60		12,504.24		76,037.84		0.00		0.00		9,634,495.76
B-8	SUB	$	7,235,000.00		7,235,000.00		47,648.55		9,377.86		57,026.41		0.00		0.00		7,225,622.14
B-9	SUB	$	16,882,000.00		16,882,000.00		111,182.15		21,882.09		133,064.24		0.00		0.00		16,860,117.91
B-10	SUB	$	18,088,000.00		18,088,000.00		119,124.67		23,445.29		142,569.96		0.00		0.00		18,064,554.71
B-11	SUB	$	13,269,015.79		13,269,015.79		87,387.61		17,199.02		104,586.63		0.01		0.00		13,251,816.76
B-X	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
P-1	SUB	$	100.00		100.00		85,805.63		0.00		85,805.63		0.00		0.00		100.00
P-2	SUB	$	100.00		100.00		53,452.10		0.00		53,452.10		0.00		0.00		100.00


Total			2,411,782,315.79		2,411,782,315.79		13,527,523.69		19,982,306.49		33,509,830.18		0.01		0.00		2,391,800,009.29
Total





Page 2 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-
									Orig. Principal		Prior							Current
									Orig. Principal		Prior							Current
	Period		Period						(with Notional)		Principal						Total	Principal
	Period		Period
Class	Starting		Ending		Method		Cusip		Balance		Balance		Interest		Principal		Distribution	Balance

									(1)		(1)		(2)		(3)		(4)=(2)+(3)	(5)
1-A-1	09/07/05		10/24/05		A-Act/360		45660LVZ9		629,654,000.00		1,000.000000		5.332507		8.318560		13.651066	991.681440
1-A-2	09/07/05		10/24/05		A-Act/360		45660LWA3		262,356,000.00		1,000.000000		5.999173		8.318560		14.317733	991.681440
1-A-3A	09/07/05		10/24/05		A-Act/360		45660LWB1		77,413,000.00		1,000.000000		5.505840		8.318560		13.824400	991.681440
1-A-3B	09/07/05		10/24/05		A-Act/360		45660LWC9		80,000,000.00		1,000.000000		5.372507		8.318560		13.691067	991.681440
2-A-1A	09/07/05		10/24/05		A-Act/360		45660LWD7		398,032,000.00		1,000.000000		5.332507		9.450530		14.783036	990.549470
2-A-1B	09/07/05		10/24/05		A-Act/360		45660LWE5		300,000,000.00		1,000.000000		5.959173		9.450530		15.409703	990.549470
2-A-2A	09/07/05		10/24/05		A-Act/360		45660LWV7		50,000,000.00		1,000.000000		5.425840		9.450530		14.876370	990.549470
2-A-2B	09/01/05		09/30/05		A-30/360		45660LWW5		65,846,000.00		1,000.000000		3.554167		9.450530		13.004696	990.549470
2-A-2C	09/07/05		10/24/05		A-Act/360		45660LWF2		175,000,000.00		1,000.000000		5.732507		9.450530		15.183036	990.549470
2-A-3A	09/07/05		10/24/05		A-Act/360		45660LWG0		84,508,000.00		1,000.000000		5.505840		9.450530		14.956370	990.549470
2-A-3B	09/07/05		10/24/05		A-Act/360		45660LWH8		90,000,000.00		1,000.000000		5.372507		9.450530		14.823036	990.549470
1-X	09/01/05		09/30/05		A-30/360		45660LWS4		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
2-X	09/01/05		09/30/05		A-30/360		45660LWT2		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
A-R	09/01/05		09/30/05		A-30/360		45660LYT0		100.00		1,000.000000		9.500000		1,000.000000		1,009.500000	0.000000
B-1	09/07/05		10/24/05		A-30/360		45660LWJ4		12,201,000.00		1,000.000000		5.692507		1.296179		6.988686	998.703821
B-2	09/07/05		10/24/05		A-30/360		45660LWK1		49,300,000.00		1,000.000000		5.759173		1.296179		7.055353	998.703821
B-3	09/07/05		10/24/05		A-30/360		45660LWL9		33,764,000.00		1,000.000000		6.092507		1.296179		7.388686	998.703821
B-4	09/07/05		10/24/05		A-30/360		45660LWM7		14,470,000.00		1,000.000000		6.172507		1.296179		7.468686	998.703821
B-5	09/07/05		10/24/05		A-30/360		45660LWN5		13,264,000.00		1,000.000000		6.359174		1.296179		7.655353	998.703821
B-6	09/07/05		10/24/05		A-30/360		45660LWP0		10,853,000.00		1,000.000000		6.585840		1.296179		7.882019	998.703821
B-7	09/07/05		10/24/05		A-30/360		45660LWQ8		9,647,000.00		1,000.000000		6.585840		1.296179		7.882019	998.703821
B-8	09/07/05		10/24/05		A-30/360		45660LWR6		7,235,000.00		1,000.000000		6.585840		1.296180		7.882019	998.703820
B-9	09/07/05		10/24/05		A-30/360		45660LWX3		16,882,000.00		1,000.000000		6.585840		1.296179		7.882019	998.703821
B-10	09/07/05		10/24/05		A-30/360		45660LWY1		18,088,000.00		1,000.000000		6.585840		1.296179		7.882019	998.703821
B-11	09/07/05		10/24/05		A-30/360		45660LWZ8		13,269,015.79		1,000.000000		6.585840		1.296179		7.882019	998.703820
B-X	09/01/05		09/30/05		A-30/360		45660LWU9		0.00		0.000000		0.000000		0.000000		0.000000	0.000000
P-1	09/07/05		10/24/05		A-30/360		45660LYU7		100.00		1,000.000000		858,056.300000		0.000000		858,056.300000	1,000.000000
P-2	09/07/05		10/24/05		A-30/360		45660LYV5		100.00		1,000.000000		534,521.000000		0.000000		534,521.000000	1,000.000000




Page 3 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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		3,357,634.15		4,311,504.25		926,310.21		5,237,814.46		8,595,448.61		0.00		0.00		624,416,185.54
1-A-2	262,356,000.00		1,573,919.12		1,796,461.25		385,962.83		2,182,424.08		3,756,343.20		0.00		0.00		260,173,575.92
1-A-3A	77,413,000.00		426,223.59		530,079.18		113,885.49		643,964.67		1,070,188.26		0.00		0.00		76,769,035.33
1-A-3B	80,000,000.00		429,800.53		547,793.46		117,691.33		665,484.79		1,095,285.32		0.00		0.00		79,334,515.21
2-A-1A	398,032,000.00		2,122,508.29		3,308,517.46		453,095.74		3,761,613.20		5,884,121.49		0.00		0.00		394,270,386.80
2-A-1B	300,000,000.00		1,787,752.00		2,493,656.88		341,502.00		2,835,158.88		4,622,910.88		0.00		0.00		297,164,841.12
2-A-2A	50,000,000.00		271,292.00		415,609.48		56,917.00		472,526.48		743,818.48		0.00		0.00		49,527,473.52
2-A-2B	65,846,000.00		234,027.66		547,324.44		74,955.13		622,279.57		856,307.23		0.00		0.00		65,223,720.43
2-A-2C	175,000,000.00		1,003,188.67		1,454,633.18		199,209.50		1,653,842.68		2,657,031.35		0.00		0.00		173,346,157.32
2-A-3A	84,508,000.00		465,287.53		702,446.52		96,198.84		798,645.36		1,263,932.89		0.00		0.00		83,709,354.64
2-A-3B	90,000,000.00		483,525.60		748,097.06		102,450.60		850,547.66		1,334,073.26		0.00		0.00		89,149,452.34
1-X	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
A-R	100.00		0.95		82.31		17.69		100.00		100.95		0.00		0.00		0.00
B-1	12,201,000.00		69,454.28		0.00		15,814.68		15,814.68		85,268.96		0.00		0.00		12,185,185.32
B-2	49,300,000.00		283,927.25		0.00		63,901.63		63,901.63		347,828.88		0.00		0.00		49,236,098.37
B-3	33,764,000.00		205,707.39		0.00		43,764.19		43,764.19		249,471.58		0.00		0.00		33,720,235.81
B-4	14,470,000.00		89,316.17		0.00		18,755.71		18,755.71		108,071.88		0.00		0.00		14,451,244.29
B-5	13,264,000.00		84,348.08		0.00		17,192.52		17,192.52		101,540.60		0.00		0.00		13,246,807.48
B-6	10,853,000.00		71,476.12		0.00		14,067.43		14,067.43		85,543.55		0.00		0.00		10,838,932.57
B-7	9,647,000.00		63,533.60		0.00		12,504.24		12,504.24		76,037.84		0.00		0.00		9,634,495.76
B-8	7,235,000.00		47,648.55		0.00		9,377.86		9,377.86		57,026.41		0.00		0.00		7,225,622.14
B-9	16,882,000.00		111,182.15		0.00		21,882.09		21,882.09		133,064.24		0.00		0.00		16,860,117.91
B-10	18,088,000.00		119,124.67		0.00		23,445.29		23,445.29		142,569.96		0.00		0.00		18,064,554.71
B-11	13,269,015.79		87,387.61		0.00		17,199.02		17,199.02		104,586.63		0.01		0.00		13,251,816.76
B-X	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
P-1	100.00		85,805.63		0.00		0.00		0.00		85,805.63		0.00		0.00		100.00
P-2	100.00		53,452.10		0.00		0.00		0.00		53,452.10		0.00		0.00		100.00


Total	2,411,782,315.79		13,527,523.69		16,856,205.47		3,126,101.02		19,982,306.49		33,509,830.18		0.01		0.00		2,391,800,009.29



Page 4 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

Interest Detail - REMIC IV
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or		Current
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or

	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	3.99938%		629,654,000.00		3,357,634.15		0.00		0.00		0.00		3,357,634.15		3,357,634.15		0.00
1-A-2	4.07068%		262,356,000.00		1,423,957.08		0.00		0.00		0.00		1,423,957.08		1,573,919.12		0.00
1-A-3A	4.07068%		77,413,000.00		420,164.93		0.00		0.00		0.00		420,164.93		426,223.59		0.00
1-A-3B	4.02938%		80,000,000.00		429,800.53		0.00		0.00		0.00		429,800.53		429,800.53		0.00
2-A-1A	3.99938%		398,032,000.00		2,122,508.29		0.00		0.00		0.00		2,122,508.29		2,122,508.29		0.00
2-A-1B	4.15904%		300,000,000.00		1,663,615.45		0.00		0.00		0.00		1,663,615.45		1,787,752.00		0.00
2-A-2A	4.06938%		50,000,000.00		271,292.00		0.00		0.00		0.00		271,292.00		271,292.00		0.00
2-A-2B	4.15904%		65,846,000.00		228,213.38		0.00		0.00		0.00		228,213.38		234,027.66		0.00
2-A-2C	4.15904%		175,000,000.00		970,442.35		0.00		0.00		0.00		970,442.35		1,003,188.67		0.00
2-A-3A	4.12938%		84,508,000.00		465,287.53		0.00		0.00		0.00		465,287.53		465,287.53		0.00
2-A-3B	4.02938%		90,000,000.00		483,525.60		0.00		0.00		0.00		483,525.60		483,525.60		0.00
1-X	0.00000%		0.00		127,573.06		0.00		0.00		0.00		127,573.06		0.00		127,573.06
2-X	0.00000%		0.00		180,915.58		0.00		0.00		0.00		180,915.58		0.00		180,915.58
A-R	11.40000%		100.00		0.55		0.00		0.00		0.00		0.55		0.95		0.00
B-1	2.95971%		12,201,000.00		48,148.54		0.00		0.00		0.00		48,148.54		69,454.28		0.00
B-2	2.95971%		49,300,000.00		194,551.50		0.00		0.00		0.00		194,551.50		283,927.25		0.00
B-3	2.95971%		33,764,000.00		133,242.12		0.00		0.00		0.00		133,242.12		205,707.39		0.00
B-4	2.95971%		14,470,000.00		57,102.64		0.00		0.00		0.00		57,102.64		89,316.17		0.00
B-5	2.95971%		13,264,000.00		52,343.43		0.00		0.00		0.00		52,343.43		84,348.08		0.00
B-6	2.95971%		10,853,000.00		42,828.95		0.00		0.00		0.00		42,828.95		71,476.12		0.00
B-7	2.95971%		9,647,000.00		38,069.74		0.00		0.00		0.00		38,069.74		63,533.60		0.00
B-8	2.95971%		7,235,000.00		28,551.32		0.00		0.00		0.00		28,551.32		47,648.55		0.00
B-9	2.95971%		16,882,000.00		66,621.06		0.00		0.00		0.00		66,621.06		111,182.15		0.00
B-10	2.95971%		18,088,000.00		71,380.27		0.00		0.00		0.00		71,380.27		119,124.67		0.00
B-11	2.95971%		13,269,015.79		52,363.22		0.00		0.00		0.00		52,363.22		87,387.61		0.00
B-X	0.00000%		0.00		321,204.64		0.00		0.00		0.00		321,204.64		0.00		321,204.64
P-1	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		85,805.63		0.00
P-2	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		53,452.10		0.00


Total			2,411,782,315.79		13,251,337.91		0.00		0.00		0.00		13,251,337.91		13,527,523.69		629,693.28



Page 5 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

Current Period Distribution - REMIC IV
					Prior												Current
	Class		Original		Principal						Total		Realized		Deferred		Principal
	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		0.00		0.00		0.00		0.00		0.00		0.00
1-X-IO	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X-IO	CSTR	$	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-IO	CSTR	$	0.00		0.00		0.00		0.00		0.00		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		0.00		0.00		0.00		0.00		0.00		0.00
Total




Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-
									Orig. Principal		Prior						Current
									Orig. Principal		Prior						Current
	Period		Period						(with Notional)		Principal						Total	Principal
	Period		Period
Class	Starting		Ending		Method		Cusip		Balance		Balance		Interest		Principal		Distribution	Balance

									(1)		(1)		(2)		(3)		(4)=(2)+(3)	(5)
1-X-IO	09/01/05		09/30/05		A-30/360				1,049,423,000.00		1,000.000000		0.000000		0.000000		0.000000	991.681440
2-X-IO	09/01/05		09/30/05		A-30/360				1,163,386,000.00		1,000.000000		0.000000		0.000000		0.000000	990.549470
B-X-IO	09/01/05		09/30/05		A-30/360				198,973,015.00		1,000.000000		0.000000		0.000000		0.000000	998.703825
1-X-PO	09/01/05		09/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
2-X-PO	09/01/05		09/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
B-X-PO-1	09/01/05		09/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000
B-X-PO-2	09/01/05		09/30/05		A-30/360				0.00		0.000000		0.000000		0.000000		0.000000	0.000000






Page 6 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
2-X-IO	0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-X-IO	0.00		0.00		0.00		0.00		0.00		0.00		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		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00


Interest Detail - REMIC IV
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or		Current
	Pass		Prior Principal				Non-		Prior		Unscheduled				Paid or

	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%		1,049,423,000.00		127,573.06		0.00		0.00		0.00		127,573.06		0.00		127,573.06
2-X-IO	0.18661%		1,163,386,000.00		180,915.58		0.00		0.00		0.00		180,915.58		0.00		180,915.58
B-X-IO	1.93718%		198,973,015.00		321,204.64		0.00		0.00		0.00		321,204.64		0.00		321,204.64
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			2,411,782,015.00		629,693.28		0.00		0.00		0.00		629,693.28		0.00		629,693.28



Page 7 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Collection Account Report
SUMMARY
SUMMARY
										Group 2		Group 1		Total
Principal Collections										11,113,695.67		8,868,610.82		19,982,306.48
Principal Withrawals										0.00		0.00		0.00
Principal Other Accounts										0.00		0.00		0.00
TOTAL NET PRINCIPAL										11,113,695.67		8,868,610.82		19,982,306.48
Interest Collections										5,063,255.35		4,454,307.16		9,517,562.51
Interest Withdrawals										-0.00		-0.00		-0.00
Interest Other Accounts										53,452.10		4,220,760.62		4,274,212.72
Interest Fees										-114,888.67		-126,696.19		-264,251.53
TOTAL NET INTEREST										5,001,818.78		8,548,371.59		13,527,523.70
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION										16,115,514.45		17,416,982.41		33,509,830.18



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
											Group 2		Group 1		Total
Scheduled Principal Received											432,410.65		548,453.26		980,863.91
Curtailments											(2,423,123.17)		(1,930,440.58)		(4,353,563.75)
Prepayments In Full											12,093,408.19		9,116,361.03		21,209,769.22
Repurchased/Substitutions											1,011,000.00		1,134,237.11		2,145,237.11
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											-237,130.67		-314,408.44		-551,539.11
Realized Losses											-0.00		-0.00		-0.00
Advanced Principal											237,130.67		314,408.44		551,539.11
TOTAL PRINCIPAL COLLECTED											11,113,695.67		8,868,610.82		19,982,306.48


PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK



PRINCIPAL - OTHER ACCOUNTS
PRINCIPAL - OTHER ACCOUNTS
										Group 2		Group 1		Total
TOTAL PRINCIPAL OTHER ACCOUNTS										0.00		0.00		0.00





Page 8 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
										Group 2		Group 1		Total
Scheduled Interest										5,345,886.28		4,685,086.35		10,030,972.63
Repurchased/Substitution Interest										842.50		1,864.07		2,706.57
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										-10,034.07		-9,160.74		-19,194.81
Delinquent Interest										-3,950,467.67		-3,128,014.59		-7,078,482.26
Compensating Interest										10,034.07		9,160.74		19,194.81
Civil Relief Act Shortfalls										-0.00		-0.00		-0.00
Interest Advanced										3,666,994.24		2,895,371.33		6,562,365.57
TOTAL INTEREST COLLECTED										5,063,255.35		4,454,307.16		9,517,562.51


INTEREST - WITHDRAWALS
INTEREST - WITHDRAWALS
										Group 2		Group 1		Total
TOTAL INTEREST WITHDRAWALS										0.00		0.00		0.00



INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
										Group 2		Group 1		Total
Prepayment Charges														139,257.73
Capitalized Interest														4,134,954.99
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										53,452.10		4,220,760.62		4,274,212.72



INTEREST - FEES
INTEREST - FEES
										Group 2		Group 1		Total
Current Servicing Fees										112,775.34		124,789.88		237,565.22
Class 1-A-3B Ambac Premium														10,666.67
Class 2-A-3B Ambac Premium														12,000.00
Trustee Fees										2,113.33		1,906.31		4,019.64
TOTAL INTEREST FEES										114,888.67		126,696.19		264,251.53




Page 9 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Credit Enhancement Report
ACCOUNTS

SPACE INTENTIONALLY LEFT BLANK



INSURANCE
INSURANCE
										Group 2		Group 1		Total
Class 1-A-3B Ambac Premium														10,666.67
Class 2-A-3B Ambac Premium														12,000.00



STRUCTURAL FEATURES

SPACE INTENTIONALLY LEFT BLANK




Page 10 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

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Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Collateral Report


COLLATERAL



											Group 2		Group 1		Total



Loan Count:


Original										2,555		4,879		7,434
Prior										2,555		4,879		7,434
Prefunding										0		0		0
Scheduled Paid Offs										-0		-0		-0
Full Voluntary Prepayments										-23		-38		-61
Repurchases										-2		-4		-6
Liquidations										-0		-0		-0
Current										2,530		4,837		7,367
Principal Balance:


Original										1,267,996,081.81		1,143,786,033.97		2,411,782,115.77
Prior										1,267,996,081.81		1,143,786,033.97		2,411,782,115.77
Prefunding										0.00		0.00		0.00
Scheduled Principal										-432,410.65		-548,453.26		-980,863.91
Partial Prepayments										(2,423,123.17)		(1,930,440.58)		(4,353,563.75)
Full Voluntary Prepayments										-12,093,408.19		-9,116,361.03		-21,209,769.22
Repurchases										-1,011,000.00		-1,134,237.11		-2,145,237.11
Liquidations										-0.00		-0.00		-0.00
Current										1,256,882,386.14		1,134,917,423.15		2,391,799,809.29





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 11 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

CHARACTERISTICS
CHARACTERISTICS
										Group 2		Group 1		Total
Weighted Average Coupon Original										5.06001%		4.91730%		4.99233%
Weighted Average Coupon Prior										5.06001%		4.91730%		4.99233%
Weighted Average Coupon Current										5.06001%		4.91730%		4.99233%
Weighted Average Months to Maturity Original										357		358		357
Weighted Average Months to Maturity Prior										357		358		357
Weighted Average Months to Maturity Current										357		358		357
Weighted Avg Remaining Amortization Term Original										357		358		357
Weighted Avg Remaining Amortization Term Prior										357		358		357
Weighted Avg Remaining Amortization Term Current										357		358		357
Weighted Average Seasoning Original										2.52		2.28		2.40
Weighted Average Seasoning Prior										2.52		2.28		2.40
Weighted Average Seasoning Current										2.52		2.28		2.40









Page 12 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

ARM CHARACTERISTICS
ARM CHARACTERISTICS
										Group 2		Group 1		Total
Weighted Average Margin Original										2.88392%		3.04715%		2.96133%
Weighted Average Margin Prior										2.88392%		3.04715%		2.96133%
Weighted Average Margin Current										2.88392%		3.04715%		2.96133%
Weighted Average Max Rate Original										9.08990%		8.92349%		9.01098%
Weighted Average Max Rate Prior										9.08990%		8.92349%		9.01098%
Weighted Average Max Rate Current										9.08990%		8.92349%		9.01098%
Weighted Average Min Rate Original										1.09215%		1.10615%		1.09879%
Weighted Average Min Rate Prior										1.09215%		1.10615%		1.09879%
Weighted Average Min Rate Current										1.09215%		1.10615%		1.09879%
Weighted Average Cap Up Original										96.13668%		97.88894%		96.96769%
Weighted Average Cap Up Prior										96.13668%		97.88894%		96.96769%
Weighted Average Cap Up Current										96.13668%		97.88894%		96.96769%
Weighted Average Cap Down Original										96.13668%		97.88894%		96.96769%
Weighted Average Cap Down Prior										96.13668%		97.88894%		96.96769%
Weighted Average Cap Down Current										96.13668%		97.88894%		96.96769%




SERVICING FEES & ADVANCES

											Group 2		Group 1		Total




Current Servicing Fees										112,775.34		124,789.88		237,565.22
Delinquent Servicing Fees										283,473.43		232,643.26		516,116.69
TOTAL SERVICING FEES										396,248.78		357,433.15		753,681.93


Total Servicing Fees										396,248.78		357,433.15		753,681.93
Compensating Interest										-10,034.07		-9,160.74		-19,194.81
Delinquent Servicing Fees										-283,473.43		-232,643.26		-516,116.69
COLLECTED SERVICING FEES										102,741.27		115,629.15		218,370.42


Total Advaced Interest										3,666,994.24		2,895,371.33		6,562,365.57
Total Advaced Principal										237,130.67		314,408.44		551,539.11
Aggregate Advances with respect to this Distribution										3,904,124.91		3,209,779.77		7,113,904.68





ADDITIONAL COLLATERAL INFORMATION
										Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)										10,034.07		9,160.74		19,194.81
Compensating Interest										-10,034.07		-9,160.74		-19,194.81
Net Prepayment Interest Shortfall (PPIS)										0.00		0.00		0.00

Weighted Average Net Mortgage Rate										6.740389%		6.597679%		6.672709%

Current Deferred Interest										1,676,526.34		1,504,752.09		3,181,278.43
Cumulative Deferred Interest										1,676,526.34		1,504,752.09		3,181,278.43
Current Net Deferred Interest										0.00		0.00		0.00
Cumulative Net Deferred Interest										0.00		0.00		0.00



Page 13 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				42,867,655.84		0.00		0.00		42,867,655.84
			% Balance				1.79%		0.00%		0.00%		1.79%
			# Loans				117		0		0		117
			% # Loans				1.59%		0.00%		0.00%		1.59%
	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		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%
	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		0.00		42,867,655.84		0.00		0.00		42,867,655.84
			% Balance		0.00%		1.79%		0.00%		0.00%		1.79%
			# Loans		0		117		0		0		117
			% # Loans		0.00%		1.59%		0.00%		0.00%		1.59%









Page 14 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution


	GROUP 1
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				14,038,963.46		0.00		0.00		14,038,963.46
			% Balance				1.24%		0.00%		0.00%		1.24%
			# Loans				62		0		0		62
			% # Loans				1.28%		0.00%		0.00%		1.28%
	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		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%
	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		0.00		14,038,963.46		0.00		0.00		14,038,963.46
			% Balance		0.00%		1.24%		0.00%		0.00%		1.24%
			# Loans		0		62		0		0		62
			% # Loans		0.00%		1.28%		0.00%		0.00%		1.28%










Page 15 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

	GROUP 2
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				28,828,692.38		0.00		0.00		28,828,692.38
			% Balance				2.29%		0.00%		0.00%		2.29%
			# Loans				55		0		0		55
			% # Loans				2.17%		0.00%		0.00%		2.17%
	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		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%
	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		0.00		28,828,692.38		0.00		0.00		28,828,692.38
			% Balance		0.00%		2.29%		0.00%		0.00%		2.29%
			# Loans		0		55		0		0		55
			% # Loans		0.00%		2.17%		0.00%		0.00%		2.17%









Page 16 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Prepayment Report

VOLUNTARY PREPAYMENTS
VOLUNTARY PREPAYMENTS

											Group 2		Group 1		Total




Current


Number of Paid in Full Loans										23		38		61
Number of Repurchased Loans										2		4		6
Total Number of Loans Prepaid in Full										25		42		67
Curtailments Amount										(2,423,123.17)		(1,930,440.58)		(4,353,563.75)
Paid in Full Balance										12,093,408.19		9,116,361.03		21,209,769.22
Repurchased Loans Balance										1,011,000.00		1,134,237.11		2,145,237.11
Total Prepayment Amount										10,681,285.02		8,320,157.56		19,001,442.58

Cumulative


Number of Paid in Full Loans										23		38		61
Number of Repurchased Loans										2		4		6
Total Number of Loans Prepaid in Full										25		42		67
Paid in Full Balance										12,093,408.19		9,116,361.03		21,209,769.22
Repurchased Loans Balance										1,011,000.00		1,134,237.11		2,145,237.11
Curtailments Amount										(2,423,123.17)		(1,930,440.58)		(4,353,563.75)
Total Prepayment Amount										10,681,285.02		8,320,157.56		19,001,442.58










Page 19 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

											Group 2		Group 1		Total



SMM										0.84%		0.73%		0.79%
3 Months Avg SMM										0.84%		0.73%		0.79%
12 Months Avg SMM										0.84%		0.73%		0.79%
Avg SMM Since Cut-off										0.84%		0.73%		0.79%


CPR										9.66%		8.39%		9.06%
3 Months Avg CPR										9.66%		8.39%		9.06%
12 Months Avg CPR										9.66%		8.39%		9.06%
Avg CPR Since Cut-off										9.66%		8.39%		9.06%


PSA										1,919.57%		1,843.31%		1,885.77%
3 Months Avg PSA Approximation										1,919.57%		1,843.30%		1,885.77%
12 Months Avg PSA Approximation										1,919.57%		1,843.30%		1,885.77%
Avg PSA Since Cut-off Approximation										1,919.57%		1,843.30%		1,885.77%










Page 20 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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 Number			Original							Current		State &		Type Prepayment

&		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
			496,000.00

120397854 2			576,000.00		575,036.46			07-Oct-2005		5.750%		NV - 90.00%		Paid Off - 360		01-Apr-2005
120397854 2					575,036.46			07-Oct-2005		5.750%		NV - 90.00%		Paid Off - 360		01-Apr-2005
121064646 1			263,012.00		262,385.23			08-Sep-2005		5.815%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121064646 1					262,385.23			08-Sep-2005		5.815%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121170868 1			168,000.00		167,238.53			29-Sep-2005		5.715%		MD - 80.00%		Paid Off - 360		01-Jun-2005
121170868 1					167,238.53			29-Sep-2005		5.715%		MD - 80.00%		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
121257392 2					646,785.44			07-Sep-2005		5.625%		CA - 71.87%		Paid Off - 360		01-May-2005
121303521 2			368,750.00		368,121.48			06-Sep-2005		5.375%		CA - 79.99%		Paid Off - 360		01-Jun-2005
121303521 2					368,121.48			06-Sep-2005		5.375%		CA - 79.99%		Paid Off - 360		01-Jun-2005
121390678 2			616,000.00		614,532.03			07-Oct-2005		5.765%		CA - 70.00%		Paid Off - 360		01-Sep-2005
121390678 2					614,532.03			07-Oct-2005		5.765%		CA - 70.00%		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
121405425 1					340,559.93			23-Sep-2005		6.015%		CA - 70.00%		Paid Off - 360		01-Aug-2005
121406587 1			224,000.00		223,247.41			06-Sep-2005		6.215%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121406587 1					223,247.41			06-Sep-2005		6.215%		CA - 80.00%		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
121414813 1					149,485.92			30-Sep-2005		5.865%		VT - 78.13%		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
121417847 1					225,734.74			07-Oct-2005		6.115%		VA - 75.00%		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
121418657 1					336,902.87			30-Sep-2005		5.915%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121419599 1			157,500.00		156,967.86			12-Sep-2005		6.115%		NJ - 75.00%		Paid Off - 360		01-Aug-2005
121419599 1					156,967.86			12-Sep-2005		6.115%		NJ - 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
121425743 2					647,759.34			12-Oct-2005		5.765%		CA - 73.91%		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
121440310 2					648,387.71			14-Oct-2005		5.365%		CA - 73.45%		Paid Off - 360		01-Jul-2005
121447443 1			506,200.00		504,489.71			06-Oct-2005		6.115%		HI - 74.99%		Paid Off - 360		01-Aug-2005
121447443 1					504,489.71			06-Oct-2005		6.115%		HI - 74.99%		Paid Off - 360		01-Aug-2005
121452561 1			150,000.00		149,495.14			07-Oct-2005		6.215%		CA - 65.22%		Paid Off - 360		01-Aug-2005
121452561 1					149,495.14			07-Oct-2005		6.215%		CA - 65.22%		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
121469643 1					100,502.71			19-Sep-2005		5.715%		NJ - 15.42%		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
121471096 2					537,629.31			23-Sep-2005		5.665%		CA - 65.00%		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
121476978 1					348,789.96			09-Sep-2005		5.715%		CA - 37.84%		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
121480998 1					191,351.29			06-Oct-2005		6.115%		FL - 80.00%		Paid Off - 360		01-Aug-2005
121505763 1			159,600.00		159,060.76			09-Sep-2005		6.115%		NV - 77.85%		Paid Off - 360		01-Aug-2005
121505763 1					159,060.76			09-Sep-2005				NV - 77.85%		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
121507094 2					390,668.04			26-Sep-2005		6.015%		CA - 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
121507640 1					66,454.48			07-Oct-2005		6.040%		FL - 36.94%		Paid Off - 360		01-Aug-2005
121514620 1			298,000.00		296,993.15			05-Oct-2005		6.115%		CA - 79.47%		Paid Off - 360		01-Aug-2005
121514620 1					296,993.15			05-Oct-2005		6.115%		CA - 79.47%		Paid Off - 360		01-Aug-2005
121519110 1			348,000.00		346,810.76			29-Sep-2005		5.915%		FL - 80.00%		Paid Off - 360		01-Aug-2005
121519110 1					346,810.76			29-Sep-2005		5.915%		FL - 80.00%		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
121522805 2					498,320.11			05-Oct-2005		6.215%		CA - 71.43%		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
121523183 1					216,804.40			15-Sep-2005		5.915%		AZ - 74.83%		Paid Off - 360		01-Aug-2005
121531777 1			235,200.00		234,916.81			07-Oct-2005		5.565%		AZ - 70.00%		Paid Off - 360		01-Aug-2005
121531777 1					234,916.81			07-Oct-2005		5.565%		AZ - 70.00%		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
121532063 1					148,477.18			20-Sep-2005		5.465%		UT - 78.42%		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
121563792 2					518,909.21			01-Sep-2005		5.740%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121568598 1			156,000.00		155,628.24			29-Sep-2005		6.115%		AZ - 80.00%		Paid Off - 360		01-Sep-2005
121568598 1					155,628.24			29-Sep-2005		6.115%		AZ - 80.00%		Paid Off - 360		01-Sep-2005
121573402 1			300,000.00		298,986.40			23-Sep-2005		6.115%		AZ - 68.99%		Paid Off - 360		01-Aug-2005
121573402 1					298,986.40			23-Sep-2005		6.115%		AZ - 68.99%		Paid Off - 360		01-Aug-2005
121579147 2			548,000.00		546,694.08			05-Oct-2005		4.865%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121579147 2					546,694.08			05-Oct-2005		4.865%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121582610 1			328,000.00		328,000.00			28-Sep-2005		1.000%		VA - 80.00%		Paid Off - 360		01-Oct-2005
121582610 1					328,000.00			28-Sep-2005		1.000%		VA - 80.00%		Paid Off - 360		01-Oct-2005
121583576 2			412,500.00		411,094.38			19-Sep-2005		5.965%		CA - 75.00%		Paid Off - 360		01-Aug-2005
121583576 2					411,094.38			19-Sep-2005		5.965%		CA - 75.00%		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
121589302 1					159,618.71					5.915%		IL - 80.00%		Paid Off - 360


Page 22 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution

Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution
Loan Number			Original							Current		State &		Type Prepayment		First
Loan Number			Original							Current		State &		Type Prepayment

&		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
			564,000.00

121596481 1			192,000.00		191,340.07			07-Sep-2005		5.815%		NM - 80.00%		Paid Off - 360		01-Aug-2005
121596481 1					191,340.07			07-Sep-2005		5.815%		NM - 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
121604549 2					389,070.61			11-Oct-2005		5.615%		CA - 65.00%		Paid Off - 360		01-Sep-2005
121610353 2			400,000.00		399,046.78			11-Oct-2005		5.765%		CA - 72.07%		Paid Off - 360		01-Sep-2005
121610353 2					399,046.78			11-Oct-2005		5.765%		CA - 72.07%		Paid Off - 360		01-Sep-2005
121615550 1			92,800.00		92,611.66			03-Oct-2005		5.865%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121615550 1					92,611.66			03-Oct-2005		5.865%		FL - 80.00%		Paid Off - 360		01-Sep-2005
121616526 1			164,000.00		163,609.18			02-Sep-2005		5.465%		MI - 69.79%		Paid Off - 360		01-Aug-2005
121616526 1					163,609.18			02-Sep-2005		5.465%		MI - 69.79%		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
121622073 1					348,789.96			03-Oct-2005		5.715%		CA - 67.31%		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
121627321 2					597,943.67			15-Sep-2005		5.865%		CA - 70.59%		Paid Off - 360		01-Aug-2005
121635603 2			479,200.00		478,058.04			19-Sep-2005		5.665%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121635603 2					478,058.04			19-Sep-2005		5.665%		CA - 80.00%		Paid Off - 360		01-Sep-2005
121675032 1			263,000.00		262,373.25			07-Oct-2005		5.915%		CA - 73.06%		Paid Off - 360		01-Sep-2005
121675032 1					262,373.25			07-Oct-2005		5.915%		CA - 73.06%		Paid Off - 360		01-Sep-2005
121693198 2			576,000.00		574,040.05			30-Aug-2005		5.990%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121693198 2					574,040.05			30-Aug-2005		5.990%		CA - 80.00%		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
121708502 2					448,927.62			14-Oct-2005		5.765%		MA - 64.75%		Paid Off - 360		01-Sep-2005
121716268 1			336,400.00		335,598.34			30-Sep-2005		5.815%		CA - 79.99%		Paid Off - 360		01-Sep-2005
121716268 1					335,598.34			30-Sep-2005		5.815%		CA - 79.99%		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
121717126 2					597,881.91			07-Oct-2005		5.375%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121717131 1			341,000.00		339,807.04			03-Oct-2005		5.500%		CA - 56.83%		Paid Off - 360		01-Aug-2005
121717131 1					339,807.04			03-Oct-2005		5.500%		CA - 56.83%		Paid Off - 360		01-Aug-2005
121717695 2			500,000.00		498,502.24			29-Sep-2005		6.375%		VA - 75.73%		Paid Off - 360		01-Aug-2005
121717695 2					498,502.24			29-Sep-2005		6.375%		VA - 75.73%		Paid Off - 360		01-Aug-2005
121723078 1			229,600.00		228,852.46			05-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121723078 1					228,852.46			05-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121723687 2			650,000.00		648,451.01			29-Aug-2005		5.875%		OR - 75.00%		Paid Off - 360		01-Sep-2005
121723687 2					648,451.01			29-Aug-2005		5.875%		OR - 75.00%		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
121752343 1					350,864.00			22-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Aug-2005
121760461 1			359,000.00		358,144.48			14-Sep-2005		5.965%		CA - 73.27%		Paid Off - 360		01-Sep-2005
121760461 1					358,144.48			14-Sep-2005		5.965%		CA - 73.27%		Paid Off - 360		01-Sep-2005
121780385 1			159,000.00		156,940.19			22-Sep-2005		5.940%		CA - 46.77%		Paid Off - 360		01-Apr-2005
121780385 1					156,940.19			22-Sep-2005		5.940%		CA - 46.77%		Paid Off - 360		01-Apr-2005
121809077 1			185,000.00		184,362.28			30-Sep-2005		5.765%		CA - 50.69%		Paid Off - 360		01-Aug-2005
121809077 1					184,362.28			30-Sep-2005		5.765%		CA - 50.69%		Paid Off - 360		01-Aug-2005
121832231 1			185,000.00		185,000.00			06-Oct-2005		1.000%		FL - 64.91%		Paid Off - 360		01-Oct-2005
121832231 1					185,000.00			06-Oct-2005		1.000%		FL - 64.91%		Paid Off - 360		01-Oct-2005
121846455 1			350,000.00		349,165.93			05-Oct-2005		5.865%		NY - 71.43%		Paid Off - 360		01-Sep-2005
121846455 1					349,165.93			05-Oct-2005		5.865%		NY - 71.43%		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
121608558 1					159,237.11			30-Sep-2005		5.915%		CA - 46.38%		Repur/Subs - 360		01-Aug-2005
121706248 2			375,000.00		375,000.00			30-Sep-2005		1.000%		NJ - 71.43%		Repur/Subs - 360		01-Oct-2005
121706248 2					375,000.00			30-Sep-2005		1.000%		NJ - 71.43%		Repur/Subs - 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
121713538 1					343,000.00			30-Sep-2005		1.000%		CA - 51.97%		Repur/Subs - 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
121814586 1					320,000.00			30-Sep-2005		2.000%		HI - 49.23%		Repur/Subs - 360		01-Oct-2005
121851481 1			312,000.00		312,000.00			30-Sep-2005		1.000%		NJ - 52.00%		Repur/Subs - 360		01-Oct-2005
121851481 1					312,000.00			30-Sep-2005		1.000%		NJ - 52.00%		Repur/Subs - 360		01-Oct-2005
121861461 2			636,000.00		636,000.00			30-Sep-2005		1.000%		FL - 80.00%		Repur/Subs - 360		01-Oct-2005
121861461 2					636,000.00			30-Sep-2005		1.000%		FL - 80.00%		Repur/Subs - 360		01-Oct-2005


TOTAL			23,414,262.00		23,355,006.33
TOTAL


Page 23 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Realized Loss Report

COLLATERAL REALIZED LOSSES



											Group 2		Group 1		Total


Current
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
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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Realized Loss Detail Report
Loan Number			Current		State &				Prior		Realized				Cumulative
															Cumulative
&		Loan	Note		LTV at		Original		Principal		Loss/(Gain)		Realized		Realized

Loan Group		Status	Rate		Origination		Term		Balance		Revision		Loss/(Gain)		Loss/(Gain)
Loan Group		Status	Rate		Origination		Term		Balance		Revision		Loss/(Gain)		Loss/(Gain)




TOTAL



Page 27 of 29
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
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
ADDITIONAL INFORMATION
										Group 2		Group 1		Total
Current Senior Percentage										91.749968%		91.749949%		91.749959%
Next Senior Percentage										91.686493%		91.697712%		91.691817%
Current Subordinate Percentage										8.250032%		8.250051%		8.250041%
Next Subordinate Percentage										8.313507%		8.302288%		8.308183%
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
IndyMac INDX Mortgage Loan Trust 2005-AR18

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR18

October 25, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
										Group 2		Group 1		Total
Current Scheduled Payments										5,778,296.93		5,233,539.61		11,011,836.53
Current Scheduled Payments 1 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 2 Month Prior										0.00		0.00		0.00
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

INDYMAC INDX MORTGAGE LOAN TRUST 2005-AR18 8-K