
                                       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 January 1, 2005, providing for the
               issuance of IndyMAc INDX Mortgage Loan Trust 2005-AR1
                Mortgage Pass-Through Certificates, Series 2005-AR1)
                 (Exact name of registrant as specified in charter)


                                        DELAWARE
                     (State or Other Jurisdiction of Incorporation)

               333-119384-10                         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-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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					4
										2. Collection Account Report					4
										3. Credit Enhancement Report					6
										4. Collateral Report					7
				Certificate Insurer(s)						5. Delinquency Report					10
				Certificate Insurer(s)						5. Delinquency Report					10
										6. REO Report					11

										7. Foreclosure Report					12
										8. Prepayment Report					13
										9. Prepayment Detail Report					16
										9. Prepayment Detail Report					16
										10. Realized Loss Report					18
										11. Realized Loss Detail Report					21
				Servicer(s)						11. Realized Loss Detail Report					21
				Servicer(s)						12. Triggers and Adj. Cert. Report					22
				IndyMac Bank						12. Triggers and Adj. Cert. Report					22
				IndyMac Bank						13. Other Related Information					23
										13. Other Related Information					23


				Underwriter(s)
				Countrywide Funding Corporation


										Total Number of Pages					23
										Total Number of Pages

				Dates						Contacts

				Cut-Off Date:			January 01, 2005			Brent Hoyler
				Close Date:			January 28, 2005			Administrator
				First Distribution Date:			February 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
										Main Phone Number:			(714) 247-6000

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






Page 1 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Certificate Payment Report
Current Period Distribution - Trust
					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		$	180,869,000.00		139,529,736.02		620,106.29		5,695,825.66		6,315,931.95		0.00		0.00		133,833,910.36
1-A-1		$	180,869,000.00		139,529,736.02		620,106.29		5,695,825.66		6,315,931.95		0.00		0.00		133,833,910.36
1-A-2		$	3,072,000.00		2,369,866.31		10,532.30		96,741.71		107,274.01		0.00		0.00		2,273,124.60
2-A-1		$	141,328,000.00		86,269,385.50		378,634.03		4,885,205.41		5,263,839.44		0.00		0.00		81,384,180.09
3-A-1		$	180,342,000.00		152,320,079.14		680,452.61		2,975,396.76		3,655,849.37		0.00		0.00		149,344,682.38
3-A-2		$	10,054,000.00		8,491,788.25		37,934.98		165,877.27		203,812.25		0.00		0.00		8,325,910.98
4-A-1		$	128,145,000.00		100,306,305.57		452,870.34		6,893,963.94		7,346,834.28		0.00		0.00		93,412,341.63
B-1		$	28,786,000.00		28,660,676.66		127,625.48		39,612.20		167,237.68		0.00		0.00		28,621,064.46
B-2		$	9,829,000.00		9,786,208.26		43,577.81		13,525.61		57,103.42		0.00		0.00		9,772,682.65
B-3		$	6,319,000.00		6,291,489.47		28,015.89		8,695.53		36,711.42		0.00		0.00		6,282,793.94
B-4		$	5,617,000.00		5,592,545.71		24,903.51		7,729.51		32,633.02		0.00		0.00		5,584,816.20
B-5		$	4,213,000.00		4,194,658.19		18,678.74		5,797.48		24,476.22		0.00		0.00		4,188,860.71
B-6		$	3,509,426.03		3,494,147.25		15,559.38		4,829.29		20,388.67		0.00		0.00		3,489,317.96
A-R		$	100.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
P		$	0.00		100.00		14,044.59		0.00		14,044.59		0.00		0.00		100.00


Total			702,083,526.03		547,306,986.33		2,452,935.95		20,793,200.37		23,246,136.32		0.00		0.00		526,513,785.96
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-A-1	09/01/05		09/30/05		A-30/360		45660LDB2		180,869,000.00		771.440855		3.428483		31.491442		34.919925	739.949413
1-A-2	09/01/05		09/30/05		A-30/360		45660LDC0		3,072,000.00		771.440856		3.428483		31.491442		34.919925	739.949414
2-A-1	09/01/05		09/30/05		A-30/360		45660LDD8		141,328,000.00		610.419630		2.679115		34.566437		37.245552	575.853193
3-A-1	09/01/05		09/30/05		A-30/360		45660LDE6		180,342,000.00		844.617888		3.773123		16.498635		20.271758	828.119253
3-A-2	09/01/05		09/30/05		A-30/360		45660LDF3		10,054,000.00		844.617888		3.773123		16.498634		20.271758	828.119254
4-A-1	09/01/05		09/30/05		A-30/360		45660LDG1		128,145,000.00		782.756296		3.534046		53.798150		57.332196	728.958146
B-1	09/01/05		09/30/05		A-30/360		45660LDH9		28,786,000.00		995.646379		4.433595		1.376093		5.809688	994.270286
B-2	09/01/05		09/30/05		A-30/360		45660LDJ5		9,829,000.00		995.646379		4.433595		1.376092		5.809688	994.270287
B-3	09/01/05		09/30/05		A-30/360		45660LDK2		6,319,000.00		995.646379		4.433596		1.376093		5.809688	994.270286
B-4	09/01/05		09/30/05		A-30/360		45660LDL0		5,617,000.00		995.646379		4.433596		1.376092		5.809688	994.270287
B-5	09/01/05		09/30/05		A-30/360		45660LDM8		4,213,000.00		995.646378		4.433596		1.376093		5.809689	994.270285
B-6	09/01/05		09/30/05		A-30/360		45660LDN6		3,509,426.03		995.646359		4.433597		1.376091		5.809688	994.270268
A-R	09/01/05		09/30/05		A-30/360		45660LDP1		100.00		0.000000		0.000000		0.000000		0.000000	0.000000
P	09/01/05		09/30/05		A-30/360		IN05A101P		0.00		0.000000		0.000000		0.000000		0.000000	0.000000




Page 2 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution

Distribution to Date - Trust
																	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	180,869,000.00		6,550,610.41		46,605,928.02		429,161.61		47,035,089.64		53,585,700.05		0.00		0.00		133,833,910.36
1-A-2	3,072,000.00		111,259.94		791,586.23		7,289.17		798,875.40		910,135.34		0.00		0.00		2,273,124.60
2-A-1	141,328,000.00		4,661,226.15		59,485,829.55		457,990.36		59,943,819.91		64,605,046.06		0.00		0.00		81,384,180.09
3-A-1	180,342,000.00		6,788,975.69		30,734,262.22		263,055.39		30,997,317.62		37,786,293.31		0.00		0.00		149,344,682.38
3-A-2	10,054,000.00		378,482.88		1,713,423.77		14,665.24		1,728,089.01		2,106,571.89		0.00		0.00		8,325,910.98
4-A-1	128,145,000.00		4,754,903.44		34,332,861.57		399,796.81		34,732,658.37		39,487,561.81		0.00		0.00		93,412,341.63
B-1	28,786,000.00		1,155,414.68		80,620.73		84,314.81		164,935.54		1,320,350.22		0.00		0.00		28,621,064.46
B-2	9,829,000.00		394,517.16		27,528.00		28,789.35		56,317.35		450,834.51		0.00		0.00		9,772,682.65
B-3	6,319,000.00		253,632.50		17,697.58		18,508.48		36,206.06		289,838.56		0.00		0.00		6,282,793.94
B-4	5,617,000.00		225,455.58		15,731.48		16,452.32		32,183.80		257,639.38		0.00		0.00		5,584,816.20
B-5	4,213,000.00		169,101.72		11,799.32		12,339.97		24,139.29		193,241.01		0.00		0.00		4,188,860.71
B-6	3,509,426.03		140,861.60		9,828.85		10,279.20		20,108.05		160,969.65		0.02		0.00		3,489,317.96
A-R	100.00		0.39		0.00		100.00		100.00		100.39		0.00		0.00		0.00
P	0.00		96,212.80		0.00		0.00		0.00		96,212.80		0.00		0.00		100.00


Total	702,083,526.03		25,680,654.94		173,827,097.32		1,742,742.71		175,569,840.04		201,250,494.98		0.02		0.00		526,513,785.96


Interest Detail - Trust
	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	5.33311%		139,529,736.02		620,106.29		0.00		0.00		0.00		620,106.29		620,106.29		0.00
1-A-2	5.33311%		2,369,866.31		10,532.30		0.00		0.00		0.00		10,532.30		10,532.30		0.00
2-A-1	5.26677%		86,269,385.50		378,634.03		0.00		0.00		0.00		378,634.03		378,634.03		0.00
3-A-1	5.36071%		152,320,079.14		680,452.61		0.00		0.00		0.00		680,452.61		680,452.61		0.00
3-A-2	5.36071%		8,491,788.25		37,934.98		0.00		0.00		0.00		37,934.98		37,934.98		0.00
4-A-1	5.41785%		100,306,305.57		452,870.34		0.00		0.00		0.00		452,870.34		452,870.34		0.00
B-1	5.34358%		28,660,676.66		127,625.48		0.00		0.00		0.00		127,625.48		127,625.48		0.00
B-2	5.34358%		9,786,208.26		43,577.81		0.00		0.00		0.00		43,577.81		43,577.81		0.00
B-3	5.34358%		6,291,489.47		28,015.89		0.00		0.00		0.00		28,015.89		28,015.89		0.00
B-4	5.34358%		5,592,545.71		24,903.51		0.00		0.00		0.00		24,903.51		24,903.51		0.00
B-5	5.34358%		4,194,658.19		18,678.74		0.00		0.00		0.00		18,678.74		18,678.74		0.00
B-6	5.34358%		3,494,147.25		15,559.38		0.00		0.00		0.00		15,559.38		15,559.38		0.00
A-R	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
P	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		14,044.59		0.00


Total			547,306,986.33		2,438,891.36		0.00		0.00		0.00		2,438,891.36		2,452,935.95		0.00



Page 3 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Collection Account Report
SUMMARY
SUMMARY
						Group 4		Group 3		Group 2		Group 1		Total
Principal Collections						6,933,359.03		3,143,584.40		4,886,969.36		5,829,287.58		20,793,200.37
Principal Withrawals						0.00		0.00		0.00		0.00		0.00
Principal Other Accounts						0.00		0.00		0.00		0.00		0.00
TOTAL NET PRINCIPAL						6,933,359.03		3,143,584.40		4,886,969.36		5,829,287.58		20,793,200.37
Interest Collections						512,976.20		811,163.91		442,956.69		716,269.39		2,483,366.18
Interest Withdrawals						-0.00		-0.00		-0.00		-0.00		-0.00
Interest Other Accounts						0.00		0.00		0.00		0.00		14,044.59
Interest Fees						-7,958.30		-16,092.05		-8,415.15		-12,009.33		-44,474.83
TOTAL NET INTEREST						505,017.90		795,071.86		434,541.53		704,260.06		2,452,935.94
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION						7,438,376.93		3,938,656.26		5,321,510.89		6,533,547.64		23,246,136.31



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
							Group 4		Group 3		Group 2		Group 1		Total
Scheduled Principal Received							22,025.64		23,954.18		13,710.29		13,710.79		73,400.90
Curtailments							6,864.82		29,919.35		7,263.94		12,185.94		56,234.05
Prepayments In Full							6,544,976.38		3,089,710.87		4,865,995.13		5,465,837.55		19,966,519.93
Repurchased/Substitutions							359,492.19		0.00		0.00		337,553.30		697,045.49
Liquidations							0.00		0.00		0.00		0.00		0.00
Insurance Principal							0.00		0.00		0.00		0.00		0.00
Other Additional Principal							0.00		0.00		0.00		0.00		0.00
Delinquent Principal							-20,107.39		-17,216.82		-11,365.52		-12,063.33		-60,753.06
Realized Losses							-0.00		-0.00		-0.00		-0.00		-0.00
Advanced Principal							20,107.39		17,216.82		11,365.52		12,063.33		60,753.06
TOTAL PRINCIPAL COLLECTED							6,933,359.03		3,143,584.40		4,886,969.36		5,829,287.58		20,793,200.37


PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK



PRINCIPAL - OTHER ACCOUNTS
PRINCIPAL - OTHER ACCOUNTS
						Group 4		Group 3		Group 2		Group 1		Total
TOTAL PRINCIPAL OTHER ACCOUNTS						0.00		0.00		0.00		0.00		0.00





Page 4 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
						Group 4		Group 3		Group 2		Group 1		Total
Scheduled Interest						539,349.08		852,830.68		466,246.10		753,695.80		2,612,121.66
Repurchased/Substitution Interest						1,760.01		0.00		0.00		1,863.58		3,623.59
Liquidation Interest						0.00		0.00		0.00		0.00		0.00
Insurance Interest						0.00		0.00		0.00		0.00		0.00
Other Additional Interest						0.00		0.00		0.00		0.00		0.00
Prepayment Interest Shortfalls						-2,413.34		-845.44		-2,116.75		-3,051.03		-8,426.56
Delinquent Interest						-434,030.62		-642,461.66		-351,974.92		-600,331.22		-2,028,798.42
Compensating Interest						2,413.34		845.44		2,116.75		3,051.03		8,426.57
Civil Relief Act Shortfalls						-0.00		-0.00		-0.00		-0.00		-0.00
Interest Advanced						405,897.73		600,794.89		328,685.51		561,041.24		1,896,419.37
TOTAL INTEREST COLLECTED						512,976.20		811,163.91		442,956.69		716,269.39		2,483,366.18


INTEREST - WITHDRAWALS
INTEREST - WITHDRAWALS
						Group 4		Group 3		Group 2		Group 1		Total
TOTAL INTEREST WITHDRAWALS						0.00		0.00		0.00		0.00		0.00



INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
						Group 4		Group 3		Group 2		Group 1		Total
Prepayment Charges														14,044.59
TOTAL INTEREST OTHER ACCOUNTS						0.00		0.00		0.00		0.00		14,044.59



INTEREST - FEES
INTEREST - FEES
						Group 4		Group 3		Group 2		Group 1		Total
Current Servicing Fees						6,822.25		13,951.27		7,650.45		10,230.37		38,654.34
Trustee Fees						512.68		815.73		453.78		726.30		2,508.49
PMI Fees						623.37		1,325.05		310.92		1,052.66		3,312.00
TOTAL INTEREST FEES						7,958.30		16,092.05		8,415.15		12,009.33		44,474.83




Page 5 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Credit Enhancement Report
ACCOUNTS

SPACE INTENTIONALLY LEFT BLANK



INSURANCE

SPACE INTENTIONALLY LEFT BLANK



STRUCTURAL FEATURES

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Page 6 of 23
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Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Collateral Report


COLLATERAL



							Group 4		Group 3		Group 2		Group 1		Total



Loan Count:


Original						284		1,063		304		1,040		2,691
Prior						227		924		197		837		2,185
Prefunding						0		0		0		0		0
Scheduled Paid Offs						-0		-0		-0		-0		-0
Full Voluntary Prepayments						-14		-16		-10		-26		-66
Repurchases						-1		-0		-0		-1		-2
Liquidations						-0		-0		-0		-0		-0
Current						212		908		187		810		2,117
Principal Balance:


Original						139,743,628.25		207,629,655.64		154,120,313.95		200,589,928.13		702,083,525.97
Prior						111,856,475.77		177,977,724.86		99,007,560.56		158,465,125.19		547,306,886.38
Prefunding						0.00		0.00		0.00		0.00		0.00
Scheduled Principal						-22,025.64		-23,954.18		-13,710.29		-13,710.79		-73,400.90
Partial Prepayments						-6,864.82		-29,919.35		-7,263.94		-12,185.94		-56,234.05
Full Voluntary Prepayments						-6,544,976.38		-3,089,710.87		-4,865,995.13		-5,465,837.55		-19,966,519.93
Repurchases						-359,492.19		-0.00		-0.00		-337,553.30		-697,045.49
Liquidations						-0.00		-0.00		-0.00		-0.00		-0.00
Current						104,923,116.74		174,834,140.46		94,120,591.20		152,635,837.61		526,513,686.01





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 7 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

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2005-AR1

October 25, 2005 Distribution

CHARACTERISTICS
CHARACTERISTICS
						Group 4		Group 3		Group 2		Group 1		Total
Weighted Average Coupon Original						5.83151%		5.78256%		5.71039%		5.75850%		5.76959%
Weighted Average Coupon Prior						5.80436%		5.75486%		5.67889%		5.72248%		5.74099%
Weighted Average Coupon Current						5.80504%		5.75014%		5.65104%		5.72158%		5.73516%
Weighted Average Months to Maturity Original						358		357		358		357		357
Weighted Average Months to Maturity Prior						351		349		351		350		350
Weighted Average Months to Maturity Current						350		349		350		349		349
Weighted Avg Remaining Amortization Term Original						358		357		358		357		357
Weighted Avg Remaining Amortization Term Prior						351		349		351		350		350
Weighted Avg Remaining Amortization Term Current						350		349		350		349		349
Weighted Average Seasoning Original						2.32		3.21		2.22		2.80		2.70
Weighted Average Seasoning Prior						9.27		10.19		9.13		9.73		9.68
Weighted Average Seasoning Current						10.25		11.19		10.11		10.76		10.68









Page 8 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution

ARM CHARACTERISTICS
ARM CHARACTERISTICS
						Group 4		Group 3		Group 2		Group 1		Total
Weighted Average Margin Original						2.68031%		2.49554%		2.67493%		2.58553%		2.59741%
Weighted Average Margin Prior						2.69213%		2.49977%		2.67928%		2.57898%		2.59560%
Weighted Average Margin Current						2.69620%		2.50302%		2.67892%		2.58121%		2.59696%
Weighted Average Max Rate Original						11.66939%		11.41604%		11.65065%		11.43514%		11.52343%
Weighted Average Max Rate Prior						11.65050%		11.41031%		11.64104%		11.39898%		11.49947%
Weighted Average Max Rate Current						11.65340%		11.41312%		11.61293%		11.39468%		11.49303%
Weighted Average Min Rate Original						2.68031%		2.49554%		2.67493%		2.58553%		2.59741%
Weighted Average Min Rate Prior						2.69213%		2.49977%		2.67928%		2.57898%		2.59560%
Weighted Average Min Rate Current						2.69620%		2.50302%		2.67892%		2.58121%		2.59696%
Weighted Average Cap Up Original						1.59448%		1.54531%		1.65480%		1.45355%		1.55291%
Weighted Average Cap Up Prior						1.57742%		1.55923%		1.66788%		1.46040%		1.55517%
Weighted Average Cap Up Current						1.57794%		1.56354%		1.68810%		1.45578%		1.55781%
Weighted Average Cap Down Original						1.59448%		1.54531%		1.65480%		1.45355%		1.55291%
Weighted Average Cap Down Prior						1.57742%		1.55923%		1.66788%		1.46040%		1.55517%
Weighted Average Cap Down Current						1.57794%		1.56354%		1.68810%		1.45578%		1.55781%




SERVICING FEES & ADVANCES

							Group 4		Group 3		Group 2		Group 1		Total




Current Servicing Fees						6,822.25		13,951.27		7,650.45		10,230.37		38,654.34
Delinquent Servicing Fees						28,132.89		41,666.77		23,289.41		39,289.98		132,379.05
TOTAL SERVICING FEES						34,955.15		55,618.04		30,939.86		49,520.35		171,033.40


Total Servicing Fees						34,955.15		55,618.04		30,939.86		49,520.35		171,033.40
Compensating Interest						-2,413.34		-845.44		-2,116.75		-3,051.03		-8,426.57
Delinquent Servicing Fees						-28,132.89		-41,666.77		-23,289.41		-39,289.98		-132,379.05
COLLECTED SERVICING FEES						4,408.91		13,105.84		5,533.70		7,179.34		30,227.79


Total Advanced Interest						405,897.73		600,794.89		328,685.51		561,041.24		1,896,419.37
Total Advanced Principal						20,107.39		17,216.82		11,365.52		12,063.33		60,753.06
Aggregate Advances with respect to this Distribution						426,005.12		618,011.71		340,051.03		573,104.57		1,957,172.43





ADDITIONAL COLLATERAL INFORMATION
						Group 4		Group 3		Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)						2,413.34		845.44		2,116.75		3,051.03		8,426.56
Compensating Interest						-2,413.34		-845.44		-2,116.75		-3,051.03		-8,426.57
Net Prepayment Interest Shortfall (PPIS)						0.00		0.00		0.00		0.00		0.00

Weighted Average Net Mortgage Rate						5.417849%		5.360706%		5.266768%		5.333111%





Page 9 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				11,302,717.49		2,910,337.75		2,895,339.86		17,108,395.10
			% Balance				2.15%		0.55%		0.55%		3.25%
			# Loans				48		16		11		75
			% # Loans				2.27%		0.76%		0.52%		3.54%
	FORECLOSURE		Balance		0.00		0.00		0.00		1,226,900.00		1,226,900.00
			% Balance		0.00%		0.00%		0.00%		0.23%		0.23%
			# Loans		0		0		0		4		4
			% # Loans		0.00%		0.00%		0.00%		0.19%		0.19%
	BANKRUPTCY		Balance		1,120,095.16		137,434.63		0.00		441,500.00		1,699,029.79
			% Balance		0.21%		0.03%		0.00%		0.08%		0.32%
			# Loans		5		1		0		1		7
			% # Loans		0.24%		0.05%		0.00%		0.05%		0.33%
	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		1,120,095.16		11,440,152.12		2,910,337.75		4,563,739.86		20,034,324.89
			% Balance		0.21%		2.17%		0.55%		0.87%		3.81%
			# Loans		5		49		16		16		86
			% # Loans		0.24%		2.31%		0.76%		0.76%		4.06%









Page 10 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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 11 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

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
120277130 1
120277130 1			262,600.00		262,600.00		01-Dec-2004		5.500%		IL - 80.00%		360		01-Jan-2005

120644362 1			284,400.00		284,400.00		01-Jan-2005		5.875%		CA - 80.00%		360		01-Feb-2005
120064629 2			500,000.00		499,900.00		01-Apr-2005		6.000%		CA - 78.43%		360		01-Feb-2005
120679899 3			180,000.00		180,000.00		01-Mar-2005		6.875%		GA - 80.00%		360		01-Feb-2005


TOTAL			1,227,000.00		1,226,900.00


Page 12 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Prepayment Report

VOLUNTARY PREPAYMENTS
VOLUNTARY PREPAYMENTS

							Group 4		Group 3		Group 2		Group 1		Total




Current


Number of Paid in Full Loans						14		16		10		26		66
Number of Repurchased Loans						1		0		0		1		2
Total Number of Loans Prepaid in Full						15		16		10		27		68
Curtailments Amount						6,864.82		29,919.35		7,263.94		12,185.94		56,234.05
Paid in Full Balance						6,544,976.38		3,089,710.87		4,865,995.13		5,465,837.55		19,966,519.93
Repurchased Loans Balance						359,492.19		0.00		0.00		337,553.30		697,045.49
Total Prepayment Amount						6,911,333.39		3,119,630.22		4,873,259.07		5,815,576.79		20,719,799.47

Cumulative


Number of Paid in Full Loans						70		151		116		224		561
Number of Repurchased Loans						2		4		1		6		13
Total Number of Loans Prepaid in Full						72		155		117		230		574
Paid in Full Balance						33,783,378.22		31,138,734.30		58,624,625.01		46,423,727.07		169,970,464.60
Repurchased Loans Balance						723,052.19		591,550.00		485,000.00		1,118,129.98		2,917,732.17
Curtailments Amount						86,204.73		838,028.46		730,700.70		268,338.13		1,923,272.02
Total Prepayment Amount						34,592,635.14		32,568,312.76		59,840,325.71		47,810,195.18		174,811,468.79










Page 13 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

							Group 4		Group 3		Group 2		Group 1		Total



SMM						6.18%		1.75%		4.92%		3.67%		3.79%
3 Months Avg SMM						4.55%		2.44%		6.32%		4.04%		4.06%
12 Months Avg SMM						3.11%		1.88%		5.32%		2.98%		3.13%
Avg SMM Since Cut-off						3.11%		1.88%		5.32%		2.98%		3.13%


CPR						53.49%		19.12%		45.43%		36.16%		37.07%
3 Months Avg CPR						42.82%		25.69%		54.30%		39.02%		39.16%
12 Months Avg CPR						31.60%		20.36%		48.10%		30.46%		31.76%
Avg CPR Since Cut-off						31.60%		20.36%		48.10%		30.46%		31.76%


PSA						2,608.74%		854.80%		2,246.95%		1,680.86%		1,735.19%
3 Months Avg PSA Approximation						2,309.93%		1,261.00%		2,966.60%		2,002.72%		2,022.14%
12 Months Avg PSA Approximation						2,515.19%		1,414.35%		3,882.10%		2,251.31%		2,373.92%
Avg PSA Since Cut-off Approximation						2,515.18%		1,414.35%		3,882.10%		2,251.31%		2,373.91%










Page 14 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

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 15 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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

120164192 3			113,600.00		112,212.84			03-Oct-2005		6.875%		GA - 80.00%		Paid Off - 360		01-Aug-2004
			113,600.00

120167670 4			430,000.00		400,957.92			03-Oct-2005		5.750%		MA - 31.39%		Paid Off - 360		01-Sep-2004
120167670 4					400,957.92			03-Oct-2005		5.750%		MA - 31.39%		Paid Off - 360		01-Sep-2004
120167683 3			214,500.00		211,475.39			04-Oct-2005		5.250%		MA - 65.00%		Paid Off - 360		01-Sep-2004
120167683 3					211,475.39			04-Oct-2005		5.250%		MA - 65.00%		Paid Off - 360		01-Sep-2004
120168182 1			218,200.00		218,200.00			16-Sep-2005		5.500%		MI - 79.99%		Paid Off - 360		01-Nov-2004
120168182 1					218,200.00			16-Sep-2005		5.500%		MI - 79.99%		Paid Off - 360		01-Nov-2004
120168190 1			185,500.00		185,500.00			05-Oct-2005		6.250%		NJ - 59.84%		Paid Off - 360		01-Nov-2004
120168190 1					185,500.00			05-Oct-2005		6.250%		NJ - 59.84%		Paid Off - 360		01-Nov-2004
120168198 1			131,850.00		131,841.00			12-Oct-2005		5.250%		NJ - 92.85%		Paid Off - 360		01-Nov-2004
120168198 1					131,841.00			12-Oct-2005		5.250%		NJ - 92.85%		Paid Off - 360		01-Nov-2004
120168236 1			251,450.00		251,409.17			26-Sep-2005		6.750%		MI - 90.00%		Paid Off - 360		01-Nov-2004
120168236 1					251,409.17			26-Sep-2005		6.750%		MI - 90.00%		Paid Off - 360		01-Nov-2004
120168570 1			96,750.00		96,596.33			03-Oct-2005		6.500%		WI - 79.96%		Paid Off - 360		01-Nov-2004
120168570 1					96,596.33			03-Oct-2005		6.500%		WI - 79.96%		Paid Off - 360		01-Nov-2004
120168590 1			97,000.00		96,929.12			06-Oct-2005		6.250%		MI - 62.58%		Paid Off - 360		01-Nov-2004
120168590 1					96,929.12			06-Oct-2005		6.250%		MI - 62.58%		Paid Off - 360		01-Nov-2004
120168640 3			100,000.00		99,500.00			03-Oct-2005		6.000%		MI - 80.00%		Paid Off - 360		01-Nov-2004
120168640 3					99,500.00			03-Oct-2005		6.000%		MI - 80.00%		Paid Off - 360		01-Nov-2004
120196444 4			432,250.00		432,250.00			14-Oct-2005		6.375%		CA - 95.00%		Paid Off - 360		01-Nov-2004
120196444 4					432,250.00			14-Oct-2005		6.375%		CA - 95.00%		Paid Off - 360		01-Nov-2004
120272440 3			115,000.00		113,344.12			12-Oct-2005		6.000%		MA - 60.53%		Paid Off - 360		01-Aug-2004
120272440 3					113,344.12			12-Oct-2005		6.000%		MA - 60.53%		Paid Off - 360		01-Aug-2004
120300672 4			793,125.00		792,008.99			27-Sep-2005		6.625%		CA - 75.00%		Paid Off - 360		01-Oct-2004
120300672 4					792,008.99			27-Sep-2005		6.625%		CA - 75.00%		Paid Off - 360		01-Oct-2004
120365201 3			302,392.00		301,388.37			04-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120365201 3					301,388.37			04-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120371303 1			94,400.00		#######			14-Oct-2005		6.375%		MI - 80.00%		Paid Off - 360		01-Nov-2004
120371303 1								14-Oct-2005		6.375%		MI - 80.00%		Paid Off - 360		01-Nov-2004
120372615 1			181,950.00		181,906.41			20-Sep-2005		6.500%		PA - 68.66%		Paid Off - 360		01-Nov-2004
120372615 1					181,906.41			20-Sep-2005		6.500%		PA - 68.66%		Paid Off - 360		01-Nov-2004
120372999 1			200,000.00		200,000.00			14-Oct-2005		7.750%		VA - 80.00%		Paid Off - 360		01-Nov-2004
120372999 1					200,000.00			14-Oct-2005		7.750%		VA - 80.00%		Paid Off - 360		01-Nov-2004
120373587 1			158,500.00		156,000.00			29-Sep-2005		5.875%		FL - 57.64%		Paid Off - 360		01-Dec-2004
120373587 1					156,000.00			29-Sep-2005		5.875%		FL - 57.64%		Paid Off - 360		01-Dec-2004
120373591 2			423,650.00		423,650.00			14-Oct-2005		4.875%		CA - 72.79%		Paid Off - 360		01-Nov-2004
120373591 2					423,650.00			14-Oct-2005		4.875%		CA - 72.79%		Paid Off - 360		01-Nov-2004
120374001 3			229,500.00		229,492.46			03-Oct-2005		5.750%		AZ - 90.00%		Paid Off - 360		01-Dec-2004
120374001 3					229,492.46			03-Oct-2005		5.750%		AZ - 90.00%		Paid Off - 360		01-Dec-2004
120374122 3			172,000.00		171,987.00			21-Sep-2005		5.625%		OR - 80.00%		Paid Off - 360		01-Dec-2004
120374122 3					171,987.00			21-Sep-2005		5.625%		OR - 80.00%		Paid Off - 360		01-Dec-2004
120374248 3			281,250.00		279,584.24			26-Sep-2005		5.625%		FL - 75.00%		Paid Off - 360		01-Nov-2004
120374248 3					279,584.24			26-Sep-2005		5.625%		FL - 75.00%		Paid Off - 360		01-Nov-2004
120375395 1			141,300.00		141,300.00			03-Oct-2005		5.875%		AZ - 90.00%		Paid Off - 360		01-Jan-2005
120375395 1					141,300.00			03-Oct-2005		5.875%		AZ - 90.00%		Paid Off - 360		01-Jan-2005
120376527 3			304,000.00		304,000.00			07-Oct-2005		5.625%		VA - 80.00%		Paid Off - 360		01-Dec-2004
120376527 3					304,000.00			07-Oct-2005		5.625%		VA - 80.00%		Paid Off - 360		01-Dec-2004
120420723 4			376,000.00		376,000.00			14-Oct-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Oct-2004
120420723 4					376,000.00			14-Oct-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Oct-2004
120423974 3			148,000.00		147,433.90			05-Oct-2005		6.250%		CO - 80.00%		Paid Off - 360		01-Sep-2004
120423974 3					147,433.90			05-Oct-2005		6.250%		CO - 80.00%		Paid Off - 360		01-Sep-2004
120433035 1			230,800.00		230,800.00			05-Oct-2005		5.875%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120433035 1					230,800.00			05-Oct-2005		5.875%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120457262 1			264,000.00		263,938.96			16-Sep-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120457262 1					263,938.96			16-Sep-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120465531 2			525,000.00		512,620.68			19-Sep-2005		4.375%		MA - 68.63%		Paid Off - 360		01-May-2004
120465531 2					512,620.68			19-Sep-2005		4.375%		MA - 68.63%		Paid Off - 360		01-May-2004
120467803 3			294,000.00		293,000.00			05-Oct-2005		5.750%		CA - 69.01%		Paid Off - 360		01-Nov-2004
120467803 3					293,000.00			05-Oct-2005		5.750%		CA - 69.01%		Paid Off - 360		01-Nov-2004
120467822 4			364,000.00		364,000.00			04-Oct-2005		5.625%		CA - 79.13%		Paid Off - 360		01-Nov-2004
120467822 4					364,000.00			04-Oct-2005		5.625%		CA - 79.13%		Paid Off - 360		01-Nov-2004
120472171 1			218,400.00		218,358.14			05-Oct-2005		5.750%		NY - 80.00%		Paid Off - 360		01-Feb-2005
120472171 1					218,358.14			05-Oct-2005		5.750%		NY - 80.00%		Paid Off - 360		01-Feb-2005
120486919 1			302,392.00		301,822.18			28-Sep-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120486919 1					301,822.18			28-Sep-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120497253 4			460,000.00		458,699.10			07-Oct-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120497253 4					458,699.10			07-Oct-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120509979 2			384,000.00		383,700.00			26-Sep-2005		5.875%		CA - 79.18%		Paid Off - 360		01-Feb-2005
120509979 2					383,700.00			26-Sep-2005		5.875%		CA - 79.18%		Paid Off - 360		01-Feb-2005
120556672 4			364,000.00		360,431.35			28-Sep-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120556672 4					360,431.35			28-Sep-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120572158 1			240,000.00		240,000.00			27-Sep-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120572158 1					240,000.00					5.875%		CA - 80.00%		Paid Off - 360


Page 16 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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

120578486 4			510,000.00		510,000.00			29-Sep-2005		5.500%		CA - 55.14%		Paid Off - 360		01-Jan-2005
			510,000.00

120579063 1			312,000.00		312,000.00			28-Sep-2005		4.875%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120579063 1					312,000.00			28-Sep-2005		4.875%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120579301 4			400,000.00		400,000.00			27-Sep-2005		5.750%		CA - 69.57%		Paid Off - 360		01-Feb-2005
120579301 4					400,000.00			27-Sep-2005		5.750%		CA - 69.57%		Paid Off - 360		01-Feb-2005
120583957 3			216,000.00		215,957.49			27-Sep-2005		5.250%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120583957 3					215,957.49			27-Sep-2005		5.250%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120603157 1			351,920.00		351,920.00			04-Oct-2005		5.625%		MD - 80.00%		Paid Off - 360		01-Feb-2005
120603157 1					351,920.00			04-Oct-2005		5.625%		MD - 80.00%		Paid Off - 360		01-Feb-2005
120608630 1			270,400.00		270,400.00			04-Oct-2005		5.875%		VA - 80.00%		Paid Off - 360		01-Jan-2005
120608630 1					270,400.00			04-Oct-2005		5.875%		VA - 80.00%		Paid Off - 360		01-Jan-2005
120610211 2			880,000.00		880,000.00			07-Oct-2005		6.500%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120610211 2					880,000.00			07-Oct-2005		6.500%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120611420 1			236,000.00		235,934.65			03-Oct-2005		6.500%		TX - 80.00%		Paid Off - 360		01-Jan-2005
120611420 1					235,934.65			03-Oct-2005		6.500%		TX - 80.00%		Paid Off - 360		01-Jan-2005
120613947 1			476,000.00		476,000.00			19-Sep-2005		5.875%		IL - 80.00%		Paid Off - 360		01-Feb-2005
120613947 1					476,000.00			19-Sep-2005		5.875%		IL - 80.00%		Paid Off - 360		01-Feb-2005
120617410 1			140,000.00		139,768.79			05-Oct-2005		6.250%		WV - 73.68%		Paid Off - 360		01-Feb-2005
120617410 1					139,768.79			05-Oct-2005		6.250%		WV - 73.68%		Paid Off - 360		01-Feb-2005
120623144 2			411,000.00		410,984.45			22-Sep-2005		6.125%		CA - 78.29%		Paid Off - 360		01-Feb-2005
120623144 2					410,984.45			22-Sep-2005		6.125%		CA - 78.29%		Paid Off - 360		01-Feb-2005
120623384 4			565,000.00		565,000.00			28-Sep-2005		6.250%		CA - 68.07%		Paid Off - 360		01-Jan-2005
120623384 4					565,000.00			28-Sep-2005		6.250%		CA - 68.07%		Paid Off - 360		01-Jan-2005
120635036 3			156,000.00		156,000.00			12-Oct-2005		6.000%		CO - 80.00%		Paid Off - 360		01-Feb-2005
120635036 3					156,000.00			12-Oct-2005		6.000%		CO - 80.00%		Paid Off - 360		01-Feb-2005
120642446 3			204,000.00		203,935.06			05-Oct-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120642446 3					203,935.06			05-Oct-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120651559 2			400,000.00		400,000.00			03-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120651559 2					400,000.00			03-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120655684 3			124,000.00		124,000.00			27-Sep-2005		5.625%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120655684 3					124,000.00			27-Sep-2005		5.625%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120663105 1			209,700.00		207,462.81			14-Oct-2005		5.750%		RI - 90.00%		Paid Off - 360		01-Dec-2004
120663105 1					207,462.81			14-Oct-2005		5.750%		RI - 90.00%		Paid Off - 360		01-Dec-2004
120667198 1			192,900.00		192,899.99			14-Oct-2005		5.500%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120667198 1					192,899.99			14-Oct-2005		5.500%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120667717 4			510,000.00		505,768.29			01-Oct-2005		5.875%		VA - 77.86%		Paid Off - 360		01-Feb-2005
120667717 4					505,768.29			01-Oct-2005		5.875%		VA - 77.86%		Paid Off - 360		01-Feb-2005
120670237 1			192,850.00		192,850.00			13-Oct-2005		6.625%		AZ - 95.00%		Paid Off - 360		01-Feb-2005
120670237 1					192,850.00			13-Oct-2005		6.625%		AZ - 95.00%		Paid Off - 360		01-Feb-2005
120682807 2			392,000.00		392,000.00			30-Sep-2005		6.000%		CA - 79.99%		Paid Off - 360		01-Feb-2005
120682807 2					392,000.00			30-Sep-2005		6.000%		CA - 79.99%		Paid Off - 360		01-Feb-2005
120688152 2			650,000.00		650,000.00			29-Sep-2005		5.750%		VA - 76.47%		Paid Off - 360		01-Feb-2005
120688152 2					650,000.00			29-Sep-2005		5.750%		VA - 76.47%		Paid Off - 360		01-Feb-2005
120712996 2			399,200.00		396,040.00			28-Sep-2005		6.125%		WA - 80.00%		Paid Off - 360		01-Feb-2005
120712996 2					396,040.00			28-Sep-2005		6.125%		WA - 80.00%		Paid Off - 360		01-Feb-2005
120714600 1			77,600.00		77,600.00			22-Sep-2005		5.750%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120714600 1					77,600.00			22-Sep-2005		5.750%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120716620 4			504,000.00		504,000.00			20-Sep-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120716620 4					504,000.00			20-Sep-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120719522 3			126,400.00		126,400.00			22-Sep-2005		6.750%		FL - 80.00%		Paid Off - 360		01-Jan-2005
120719522 3					126,400.00			22-Sep-2005		6.750%		FL - 80.00%		Paid Off - 360		01-Jan-2005
120748745 4			360,000.00		360,000.00			12-Oct-2005		5.375%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120748745 4					360,000.00			12-Oct-2005		5.375%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120749108 2			417,000.00		417,000.00			29-Sep-2005		4.875%		CA - 52.13%		Paid Off - 360		01-Jan-2005
120749108 2					417,000.00			29-Sep-2005		4.875%		CA - 52.13%		Paid Off - 360		01-Jan-2005
120749117 4			520,000.00		515,860.73			28-Sep-2005		5.875%		CA - 63.03%		Paid Off - 360		01-Jan-2005
120749117 4					515,860.73			28-Sep-2005		5.875%		CA - 63.03%		Paid Off - 360		01-Jan-2005
120630680 4			362,500.00		359,492.19			01-Jan-1900		5.875%		CA - 72.50%		Repur/Subs - 360		01-Feb-2005
120630680 4					359,492.19			01-Jan-1900		5.875%		CA - 72.50%		Repur/Subs - 360		01-Feb-2005
120699699 1			340,000.00		337,553.30			01-Jan-1900		6.625%		CA - 80.00%		Repur/Subs - 360		01-Feb-2005
120699699 1					337,553.30			01-Jan-1900		6.625%		CA - 80.00%		Repur/Subs - 360		01-Feb-2005


TOTAL			20,745,229.00		20,663,565.42
TOTAL


Page 17 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Realized Loss Report

COLLATERAL REALIZED LOSSES



							Group 4		Group 3		Group 2		Group 1		Total


Current
Current



Number of Loans Liquidated						0		0		0		0		0
Collateral Principal Realized Loss/(Gain) Amount						0.00		0.00		0.00		0.00		0.00
Collateral Interest Realized Loss/(Gain) Amount						0.00		0.00		0.00		0.00		0.00
Net Liquidation Proceeds						0.00		0.00		0.00		0.00		0.00

Cumulative
Cumulative



Number of Loans Liquidated						0		0		0		0		0
Collateral Realized Loss/(Gain) Amount						0.00		0.00		0.00		0.00		0.00
Net Liquidation Proceeds						0.00		0.00		0.00		0.00		0.00





		Special Hazard Loss Coverage Amt														7,020,835.00
		Fraud Loss Coverage Amt														14,041,671.00
		Bankrupt Loss Coverage Amt														316,641.00
		Class B-1 Writedown Amount														0.00
		Class B-2 Writedown Amount														0.00
		Class B-3 Writedown Amount														0.00
		Class B-4 Writedown Amount														0.00
		Class B-5 Writedown Amount														0.00
		Class B-6 Writedown Amount														0.00









Page 18 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution


DEFAULT SPEEDS



							Group 4		Group 3		Group 2		Group 1		Total



MDR						0.00%		0.00%		0.00%		0.00%		0.00%
3 Months Avg MDR						0.00%		0.00%		0.00%		0.00%		0.00%
12 Months Avg MDR						0.00%		0.00%		0.00%		0.00%		0.00%
Avg MDR Since Cut-off						0.00%		0.00%		0.00%		0.00%		0.00%


CDR						0.00%		0.00%		0.00%		0.00%		0.00%
3 Months Avg CDR						0.00%		0.00%		0.00%		0.00%		0.00%
12 Months Avg CDR						0.00%		0.00%		0.00%		0.00%		0.00%
Avg CDR Since Cut-off						0.00%		0.00%		0.00%		0.00%		0.00%


SDA						0.00%		0.00%		0.00%		0.00%		0.00%
3 Months Avg SDA Approximation						0.00%		0.00%		0.00%		0.00%		0.00%
12 Months Avg SDA Approximation						0.00%		0.00%		0.00%		0.00%		0.00%
Avg SDA Since Cut-off Approximation						0.00%		0.00%		0.00%		0.00%		0.00%


Loss Severity Approximation for Current Period						0.00%		0.00%		0.00%		0.00%		0.00%
3 Months Avg Loss Severity Approximation						0.00%		0.00%		0.00%		0.00%		0.00%
12 Months Avg Loss Severity Approximation						0.00%		0.00%		0.00%		0.00%		0.00%
Avg Loss Severity Approximation Since Cut-off						0.00%		0.00%		0.00%		0.00%		0.00%












Page 19 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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 20 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

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 21 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
TRIGGER EVENTS
						Group 4		Group 3		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
						Has Special Haz. Cov. Term Date Occured								0
						Has Fraud Loss Coverage Term Date Occured								0
						Has BK Loss Cov. Term Date Occured (0=No,1=Yes)								0



ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK



ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
						Group 4		Group 3		Group 2		Group 1		Total
Current Senior Percentage														89.399051%
Next Senior Percentage														88.995626%
Current Subordinate Percentage														10.600949%
Next Subordinate Percentage														11.004374%
Senior Prepayment Percentage														100.000000%
Next Senior Prepayment Percentage														100.000000%
Subordinate Prepayment Percentage														0.000000%
Next Subordinate Prepayment Percentage														0.000000%




Page 22 of 23
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-AR1

October 25, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
						Group 4		Group 3		Group 2		Group 1		Total
Current Scheduled Payments														2,685,522.55
Current Scheduled Payments 1 Month Prior														2,822,474.42
Current Scheduled Payments 2 Month Prior														2,933,436.40
Current Scheduled Payments 3 Month Prior														3,056,932.42
Current Scheduled Payments 4 Month Prior														3,181,988.60
Current Scheduled Payments 5 Month Prior														3,267,934.02
Current Scheduled Payments 6 Month Prior														3,348,670.91
Current Scheduled Payments 7 Month Prior														3,419,843.70
Current Scheduled Payments 8 Month Prior														3,461,787.79
Current Scheduled Payments 9 Month Prior														0.00
Current Scheduled Payments 10 Month Prior														0.00
Current Scheduled Payments 11 Month Prior														0.00


Delinquent 60+ Scheduled Payments														0.00
Delinq. 60+ Sched. Pmnts, 1 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 2 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 3 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 4 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 5 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 6 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 7 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 8 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 9 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 10 Month Prior														0.00
Delinq. 60+ Sched. Pmnts, 11 Month Prior														0.00






Page 23 of 23

IndyMac INDX Mortgage Loan Trust 2005-AR1 8-K