
                                       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):  August 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
     August 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:  Aug 26, 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 August 25, 2005.



IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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					19
										11. Realized Loss Detail Report					22
				Servicer(s)						11. Realized Loss Detail Report					22
				Servicer(s)						12. Triggers and Adj. Cert. Report					23
				IndyMac Bank						12. Triggers and Adj. Cert. Report					23
				IndyMac Bank						13. Other Related Information					24
										13. Other Related Information					24


				Underwriter(s)
				Countrywide Funding Corporation


										Total Number of Pages					24
										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:			August 25, 2005
										Factor Information:			(800) 735-7777
				Record Date:			July 29, 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 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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		153,567,651.96		684,426.76		7,288,808.82		7,973,235.58		0.00		0.00		146,278,843.14
1-A-1		$	180,869,000.00		153,567,651.96		684,426.76		7,288,808.82		7,973,235.58		0.00		0.00		146,278,843.14
1-A-2		$	3,072,000.00		2,608,295.66		11,624.76		123,798.00		135,422.76		0.00		0.00		2,484,497.66
2-A-1		$	141,328,000.00		101,776,073.17		448,413.57		4,928,308.83		5,376,722.40		0.00		0.00		96,847,764.34
3-A-1		$	180,342,000.00		162,171,642.89		725,903.43		4,727,845.32		5,453,748.75		0.00		0.00		157,443,797.57
3-A-2		$	10,054,000.00		9,041,009.29		40,468.85		263,575.63		304,044.48		0.00		0.00		8,777,433.66
4-A-1		$	128,145,000.00		109,175,275.11		493,208.48		5,187,315.95		5,680,524.43		0.00		0.00		103,987,959.16
B-1		$	28,786,000.00		28,681,147.80		128,017.03		16,619.41		144,636.44		0.00		0.00		28,664,528.39
B-2		$	9,829,000.00		9,793,198.15		43,711.50		5,674.71		49,386.21		0.00		0.00		9,787,523.44
B-3		$	6,319,000.00		6,295,983.22		28,101.84		3,648.23		31,750.07		0.00		0.00		6,292,334.99
B-4		$	5,617,000.00		5,596,540.24		24,979.91		3,242.94		28,222.85		0.00		0.00		5,593,297.30
B-5		$	4,213,000.00		4,197,654.26		18,736.04		2,432.35		21,168.39		0.00		0.00		4,195,221.91
B-6		$	3,509,426.03		3,496,642.99		15,607.11		2,026.16		17,633.27		0.00		0.00		3,494,616.83
A-R		$	100.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
P		$	0.00		100.00		30,794.30		0.00		30,794.30		0.00		0.00		100.00


Total			702,083,526.03		596,401,214.74		2,693,993.58		22,553,296.35		25,247,289.93		0.00		0.00		573,847,918.39
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	07/01/05		07/30/05		A-30/360		45660LDB2		180,869,000.00		849.054575		3.784102		40.298829		44.082931	808.755747
1-A-2	07/01/05		07/30/05		A-30/360		45660LDC0		3,072,000.00		849.054577		3.784102		40.298828		44.082930	808.755749
2-A-1	07/01/05		07/30/05		A-30/360		45660LDD8		141,328,000.00		720.140900		3.172857		34.871426		38.044283	685.269475
3-A-1	07/01/05		07/30/05		A-30/360		45660LDE6		180,342,000.00		899.245006		4.025149		26.215997		30.241146	873.029009
3-A-2	07/01/05		07/30/05		A-30/360		45660LDF3		10,054,000.00		899.245006		4.025149		26.215997		30.241146	873.029009
4-A-1	07/01/05		07/30/05		A-30/360		45660LDG1		128,145,000.00		851.966718		3.848831		40.480050		44.328881	811.486669
B-1	07/01/05		07/30/05		A-30/360		45660LDH9		28,786,000.00		996.357528		4.447198		0.577344		5.024541	995.780184
B-2	07/01/05		07/30/05		A-30/360		45660LDJ5		9,829,000.00		996.357529		4.447197		0.577344		5.024541	995.780185
B-3	07/01/05		07/30/05		A-30/360		45660LDK2		6,319,000.00		996.357528		4.447197		0.577343		5.024540	995.780185
B-4	07/01/05		07/30/05		A-30/360		45660LDL0		5,617,000.00		996.357529		4.447198		0.577344		5.024542	995.780185
B-5	07/01/05		07/30/05		A-30/360		45660LDM8		4,213,000.00		996.357527		4.447197		0.577344		5.024541	995.780183
B-6	07/01/05		07/30/05		A-30/360		45660LDN6		3,509,426.03		996.357513		4.447197		0.577348		5.024545	995.780165
A-R	07/01/05		07/30/05		A-30/360		45660LDP1		100.00		0.000000		0.000000		0.000000		0.000000	0.000000
P	07/01/05		07/30/05		A-30/360		IN05A101P		0.00		0.000000		0.000000		0.000000		0.000000	0.000000




Page 2 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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		5,280,254.91		34,368,026.70		222,130.16		34,590,156.86		39,870,411.77		0.00		0.00		146,278,843.14
1-A-2	3,072,000.00		89,683.37		583,729.54		3,772.81		587,502.34		677,185.71		0.00		0.00		2,484,497.66
2-A-1	141,328,000.00		3,855,487.46		44,212,322.58		267,913.08		44,480,235.66		48,335,723.12		0.00		0.00		96,847,764.34
3-A-1	180,342,000.00		5,404,528.58		22,747,470.54		150,731.89		22,898,202.43		28,302,731.01		0.00		0.00		157,443,797.57
3-A-2	10,054,000.00		301,300.47		1,268,163.08		8,403.25		1,276,566.33		1,577,866.80		0.00		0.00		8,777,433.66
4-A-1	128,145,000.00		3,832,580.59		23,996,105.59		160,935.25		24,157,040.84		27,989,621.43		0.00		0.00		103,987,959.16
B-1	28,786,000.00		899,972.56		80,620.07		40,851.54		121,471.61		1,021,444.17		0.00		0.00		28,664,528.39
B-2	9,829,000.00		307,296.27		27,527.77		13,948.79		41,476.56		348,772.83		0.00		0.00		9,787,523.44
B-3	6,319,000.00		197,558.76		17,697.43		8,967.58		26,665.01		224,223.77		0.00		0.00		6,292,334.99
B-4	5,617,000.00		175,611.26		15,731.36		7,971.34		23,702.70		199,313.96		0.00		0.00		5,593,297.30
B-5	4,213,000.00		131,716.26		11,799.23		5,978.86		17,778.09		149,494.35		0.00		0.00		4,195,221.91
B-6	3,509,426.03		109,719.54		9,828.77		4,980.41		14,809.18		124,528.72		0.02		0.00		3,494,616.83
A-R	100.00		0.39		0.00		100.00		100.00		100.39		0.00		0.00		0.00
P	0.00		68,015.64		0.00		0.00		0.00		68,015.64		0.00		0.00		100.00


Total	702,083,526.03		20,653,726.06		127,339,022.66		896,684.96		128,235,707.61		148,889,433.67		0.02		0.00		573,847,918.39


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	5.34821%		153,567,651.96		684,426.76		0.00		0.00		0.00		684,426.76		684,426.76		0.00
1-A-2	5.34821%		2,608,295.66		11,624.76		0.00		0.00		0.00		11,624.76		11,624.76		0.00
2-A-1	5.28706%		101,776,073.17		448,413.57		0.00		0.00		0.00		448,413.57		448,413.57		0.00
3-A-1	5.37137%		162,171,642.89		725,903.43		0.00		0.00		0.00		725,903.43		725,903.43		0.00
3-A-2	5.37137%		9,041,009.29		40,468.85		0.00		0.00		0.00		40,468.85		40,468.85		0.00
4-A-1	5.42110%		109,175,275.11		493,208.48		0.00		0.00		0.00		493,208.48		493,208.48		0.00
B-1	5.35615%		28,681,147.80		128,017.03		0.00		0.00		0.00		128,017.03		128,017.03		0.00
B-2	5.35615%		9,793,198.15		43,711.50		0.00		0.00		0.00		43,711.50		43,711.50		0.00
B-3	5.35615%		6,295,983.22		28,101.84		0.00		0.00		0.00		28,101.84		28,101.84		0.00
B-4	5.35615%		5,596,540.24		24,979.91		0.00		0.00		0.00		24,979.91		24,979.91		0.00
B-5	5.35615%		4,197,654.26		18,736.04		0.00		0.00		0.00		18,736.04		18,736.04		0.00
B-6	5.35615%		3,496,642.99		15,607.11		0.00		0.00		0.00		15,607.11		15,607.11		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		30,794.30		0.00


Total			596,401,214.74		2,663,199.28		0.00		0.00		0.00		2,663,199.28		2,693,993.58		0.00



Page 3 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 25, 2005 Distribution
Collection Account Report
SUMMARY
SUMMARY
						Group 4		Group 3		Group 2		Group 1		Total
Principal Collections						5,189,679.13		4,993,660.36		4,929,945.02		7,440,011.82		22,553,296.33
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						5,189,679.13		4,993,660.36		4,929,945.02		7,440,011.82		22,553,296.33
Interest Collections						552,163.74		860,309.61		515,374.27		784,727.91		2,712,575.53
Interest Withdrawals						-0.00		-0.00		-0.00		-0.00		-0.00
Interest Other Accounts						0.00		0.00		0.00		0.00		30,794.30
Interest Fees						-6,754.95		-17,080.30		-10,823.00		-14,718.01		-49,376.23
TOTAL NET INTEREST						545,408.79		843,229.31		504,551.27		770,009.90		2,693,993.60
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION						5,735,087.92		5,836,889.68		5,434,496.30		8,210,021.73		25,247,289.93



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
							Group 4		Group 3		Group 2		Group 1		Total
Scheduled Principal Received							24,691.39		24,569.45		14,705.68		14,746.59		78,713.11
Curtailments							9,412.64		80,981.38		9,865.06		13,038.38		113,297.46
Prepayments In Full							5,155,575.10		4,888,109.53		4,905,374.28		7,141,649.21		22,090,708.12
Repurchased/Substitutions							0.00		0.00		0.00		270,577.64		270,577.64
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							-21,979.81		-18,482.91		-12,249.97		-11,635.99		-64,348.68
Realized Losses							-0.00		-0.00		-0.00		-0.00		-0.00
Advanced Principal							21,979.81		18,482.91		12,249.97		11,635.99		64,348.68
TOTAL PRINCIPAL COLLECTED							5,189,679.13		4,993,660.36		4,929,945.02		7,440,011.82		22,553,296.33


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 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 25, 2005 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
						Group 4		Group 3		Group 2		Group 1		Total
Scheduled Interest						584,313.69		904,350.90		541,439.97		824,618.74		2,854,723.30
Repurchased/Substitution Interest						0.00		0.00		0.00		1,446.95		1,446.95
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						-1,649.21		-4,244.08		-2,322.98		-5,385.05		-13,601.32
Delinquent Interest						-496,943.03		-679,508.42		-397,056.91		-634,215.90		-2,207,724.26
Compensating Interest						1,649.21		4,244.08		2,322.98		5,385.05		13,601.32
Civil Relief Act Shortfalls						-0.00		-0.00		-0.00		-0.00		-0.00
Interest Advanced						464,793.08		635,467.13		370,991.21		592,878.13		2,064,129.55
TOTAL INTEREST COLLECTED						552,163.74		860,309.61		515,374.27		784,727.91		2,712,575.53


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														30,794.30
TOTAL INTEREST OTHER ACCOUNTS						0.00		0.00		0.00		0.00		30,794.30



INTEREST - FEES
INTEREST - FEES
						Group 4		Group 3		Group 2		Group 1		Total
Current Servicing Fees						5,578.23		14,828.40		9,721.05		12,652.94		42,780.62
Trustee Fees						553.35		863.42		524.87		791.86		2,733.50
PMI Fees						623.37		1,388.47		577.07		1,273.20		3,862.11
TOTAL INTEREST FEES						6,754.95		17,080.30		10,823.00		14,718.01		49,376.23




Page 5 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

Mortgage Pass-Through Certificates
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2005-AR1

August 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 24
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Mortgage Pass-Through Certificates
2005-AR1

August 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						246		972		227		910		2,355
Prefunding						0		0		0		0		0
Scheduled Paid Offs						-0		-0		-0		-0		-0
Full Voluntary Prepayments						-11		-24		-10		-38		-83
Repurchases						-0		-0		-0		-2		-2
Liquidations						-0		-0		-0		-0		-0
Current						235		948		217		870		2,270
Principal Balance:


Original						139,743,628.25		207,629,655.64		154,120,313.95		200,589,928.13		702,083,525.97
Prior						120,730,190.88		188,383,024.94		114,517,603.11		172,770,295.83		596,401,114.76
Prefunding						0.00		0.00		0.00		0.00		0.00
Scheduled Principal						-24,691.39		-24,569.45		-14,705.68		-14,746.59		-78,713.11
Partial Prepayments						-9,412.64		-80,981.38		-9,865.06		-13,038.38		-113,297.46
Full Voluntary Prepayments						-5,155,575.10		-4,888,109.53		-4,905,374.28		-7,141,649.21		-22,090,708.12
Repurchases						-0.00		-0.00		-0.00		-270,577.64		-270,577.64
Liquidations						-0.00		-0.00		-0.00		-0.00		-0.00
Current						115,540,511.75		183,389,364.58		109,587,658.09		165,330,284.01		573,847,818.43





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 7 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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2005-AR1

August 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						5.81181%		5.76535%		5.69253%		5.74336%		5.75386%
Weighted Average Coupon Current						5.80780%		5.76072%		5.67361%		5.73755%		5.74681%
Weighted Average Months to Maturity Original						358		357		358		357		357
Weighted Average Months to Maturity Prior						353		352		353		352		352
Weighted Average Months to Maturity Current						352		351		352		351		351
Weighted Avg Remaining Amortization Term Original						358		357		358		357		357
Weighted Avg Remaining Amortization Term Prior						353		352		353		352		352
Weighted Avg Remaining Amortization Term Current						352		351		352		351		351
Weighted Average Seasoning Original						2.32		3.21		2.22		2.80		2.70
Weighted Average Seasoning Prior						7.25		8.20		7.24		7.74		7.69
Weighted Average Seasoning Current						8.28		9.19		8.21		8.74		8.69









Page 8 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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						2.69480%		2.49780%		2.67890%		2.58502%		2.59882%
Weighted Average Margin Current						2.69305%		2.49763%		2.67689%		2.58189%		2.59602%
Weighted Average Max Rate Original						11.66939%		11.41604%		11.65065%		11.43514%		11.52343%
Weighted Average Max Rate Prior						11.66172%		11.41393%		11.64938%		11.41576%		11.51123%
Weighted Average Max Rate Current						11.66049%		11.41075%		11.63402%		11.41317%		11.50487%
Weighted Average Min Rate Original						2.68031%		2.49554%		2.67493%		2.58553%		2.59741%
Weighted Average Min Rate Prior						2.69480%		2.49780%		2.67890%		2.58502%		2.59882%
Weighted Average Min Rate Current						2.69305%		2.49763%		2.67689%		2.58189%		2.59602%
Weighted Average Cap Up Original						1.59448%		1.54531%		1.65480%		1.45355%		1.55291%
Weighted Average Cap Up Prior						1.59095%		1.55423%		1.67490%		1.45495%		1.55684%
Weighted Average Cap Up Current						1.58434%		1.55520%		1.67225%		1.45584%		1.55479%
Weighted Average Cap Down Original						1.59448%		1.54531%		1.65480%		1.45355%		1.55291%
Weighted Average Cap Down Prior						1.59095%		1.55423%		1.67490%		1.45495%		1.55684%
Weighted Average Cap Down Current						1.58434%		1.55520%		1.67225%		1.45584%		1.55479%




SERVICING FEES & ADVANCES

							Group 4		Group 3		Group 2		Group 1		Total




Current Servicing Fees						5,578.23		14,828.40		9,721.05		12,652.94		42,780.62
Delinquent Servicing Fees						32,149.95		44,041.29		26,065.70		41,337.78		143,594.72
TOTAL SERVICING FEES						37,728.19		58,869.70		35,786.75		53,990.72		186,375.36


Total Servicing Fees						37,728.19		58,869.70		35,786.75		53,990.72		186,375.36
Compensating Interest						-1,649.21		-4,244.08		-2,322.98		-5,385.05		-13,601.32
Delinquent Servicing Fees						-32,149.95		-44,041.29		-26,065.70		-41,337.78		-143,594.72
COLLECTED SERVICING FEES						3,929.02		10,584.33		7,398.07		7,267.90		29,179.32


Total Advanced Interest						464,793.08		635,467.13		370,991.21		592,878.13		2,064,129.55
Total Advanced Principal						21,979.81		18,482.91		12,249.97		11,635.99		64,348.68
Aggregate Advances with respect to this Distribution						486,772.89		653,950.04		383,241.18		604,514.12		2,128,478.23





ADDITIONAL COLLATERAL INFORMATION
						Group 4		Group 3		Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)						1,649.21		4,244.08		2,322.98		5,385.05		13,601.32
Compensating Interest						-1,649.21		-4,244.08		-2,322.98		-5,385.05		-13,601.32
Net Prepayment Interest Shortfall (PPIS)						0.00		0.00		0.00		0.00		0.00

Weighted Average Net Mortgage Rate						5.421101%		5.371371%		5.287061%		5.348210%





Page 9 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

August 25, 2005 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				10,908,491.75		3,008,706.28		1,329,900.00		15,247,098.03
			% Balance				1.90%		0.52%		0.23%		2.66%
			# Loans				47		13		3		63
			% # Loans				2.07%		0.57%		0.13%		2.78%
	FORECLOSURE		Balance		0.00		0.00		0.00		847,750.00		847,750.00
			% Balance		0.00%		0.00%		0.00%		0.15%		0.15%
			# Loans		0		0		0		3		3
			% # Loans		0.00%		0.00%		0.00%		0.13%		0.13%
	BANKRUPTCY		Balance		969,175.25		540,000.00		0.00		441,500.00		1,950,675.25
			% Balance		0.17%		0.09%		0.00%		0.08%		0.34%
			# Loans		6		1		0		1		8
			% # Loans		0.26%		0.04%		0.00%		0.04%		0.35%
	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		969,175.25		11,448,491.75		3,008,706.28		2,619,150.00		18,045,523.28
			% Balance		0.17%		2.00%		0.52%		0.46%		3.14%
			# Loans		6		48		13		7		74
			% # Loans		0.26%		2.11%		0.57%		0.31%		3.26%









Page 10 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

August 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

120602141 1			300,750.00		300,750.00		01-Jan-2005		6.875%		NY - 75.00%		360		01-Feb-2005
120644362 1			284,400.00		284,400.00		01-Jan-2005		5.875%		CA - 80.00%		360		01-Feb-2005


TOTAL			847,750.00		847,750.00


Page 12 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

August 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						11		24		10		38		83
Number of Repurchased Loans						0		0		0		2		2
Total Number of Loans Prepaid in Full						11		24		10		40		85
Curtailments Amount						9,412.64		80,981.38		9,865.06		13,038.38		113,297.46
Paid in Full Balance						5,155,575.10		4,888,109.53		4,905,374.28		7,141,649.21		22,090,708.12
Repurchased Loans Balance						0.00		0.00		0.00		270,577.64		270,577.64
Total Prepayment Amount						5,164,987.74		4,969,090.91		4,915,239.34		7,425,265.23		22,474,583.22

Cumulative


Number of Paid in Full Loans						48		111		86		165		410
Number of Repurchased Loans						1		4		1		5		11
Total Number of Loans Prepaid in Full						49		115		87		170		421
Paid in Full Balance						23,585,802.32		22,786,059.83		43,203,369.87		34,127,168.36		123,702,400.38
Repurchased Loans Balance						363,560.00		591,550.00		485,000.00		780,576.68		2,220,686.68
Curtailments Amount						71,730.47		683,743.84		713,383.33		235,888.94		1,704,746.58
Total Prepayment Amount						24,021,092.79		24,061,353.67		44,401,753.20		35,143,633.98		127,627,833.64










Page 13 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

August 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

							Group 4		Group 3		Group 2		Group 1		Total



SMM						4.28%		2.64%		4.29%		4.30%		3.77%
3 Months Avg SMM						4.49%		2.19%		5.77%		3.68%		3.80%
12 Months Avg SMM						2.66%		1.75%		4.74%		2.72%		2.83%
Avg SMM Since Cut-off						2.66%		1.75%		4.74%		2.72%		2.83%


CPR						40.83%		27.44%		40.93%		40.97%		36.94%
3 Months Avg CPR						42.41%		23.36%		51.02%		36.25%		37.21%
12 Months Avg CPR						27.65%		19.04%		44.18%		28.13%		29.12%
Avg CPR Since Cut-off						27.65%		19.04%		44.18%		28.13%		29.12%


PSA						2,466.36%		1,493.25%		2,492.46%		2,345.37%		2,125.58%
3 Months Avg PSA Approximation						2,917.91%		1,425.10%		3,535.01%		2,339.34%		2,419.89%
12 Months Avg PSA Approximation						2,615.44%		1,535.56%		4,234.05%		2,437.84%		2,558.18%
Avg PSA Since Cut-off Approximation						2,615.44%		1,535.55%		4,234.05%		2,437.84%		2,558.17%










Page 14 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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Mortgage Pass-Through Certificates
2005-AR1

August 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 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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

120085270 1			148,675.00		148,675.00			09-Aug-2005		8.125%		FL - 95.00%		Paid Off - 360		01-Sep-2004
			148,675.00

120142462 1			170,100.00		169,810.32			12-Aug-2005		6.500%		CA - 90.00%		Paid Off - 360		01-Oct-2004
120142462 1					169,810.32			12-Aug-2005		6.500%		CA - 90.00%		Paid Off - 360		01-Oct-2004
120160393 1			152,000.00		152,000.00			21-Jul-2005		4.625%		GA - 80.00%		Paid Off - 360		01-Sep-2004
120160393 1					152,000.00			21-Jul-2005		4.625%		GA - 80.00%		Paid Off - 360		01-Sep-2004
120160406 1			144,000.00		143,993.90			01-Aug-2005		5.375%		CA - 50.53%		Paid Off - 360		01-Sep-2004
120160406 1					143,993.90			01-Aug-2005		5.375%		CA - 50.53%		Paid Off - 360		01-Sep-2004
120163377 1			208,000.00		207,986.01			22-Jul-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Sep-2004
120163377 1					207,986.01			22-Jul-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Sep-2004
120164243 3			254,600.00		251,003.44			21-Jul-2005		4.500%		GA - 80.00%		Paid Off - 360		01-Aug-2004
120164243 3					251,003.44			21-Jul-2005		4.500%		GA - 80.00%		Paid Off - 360		01-Aug-2004
120164632 3			218,000.00		218,000.00			21-Jul-2005		5.750%		VA - 66.67%		Paid Off - 360		01-Aug-2004
120164632 3					218,000.00			21-Jul-2005		5.750%		VA - 66.67%		Paid Off - 360		01-Aug-2004
120165508 1			177,000.00		175,197.72			15-Aug-2005		6.000%		NV - 79.93%		Paid Off - 360		01-Oct-2004
120165508 1					175,197.72			15-Aug-2005		6.000%		NV - 79.93%		Paid Off - 360		01-Oct-2004
120167130 2			361,600.00		360,763.06			15-Aug-2005		5.000%		VA - 80.00%		Paid Off - 360		01-Oct-2004
120167130 2					360,763.06			15-Aug-2005		5.000%		VA - 80.00%		Paid Off - 360		01-Oct-2004
120167664 2			396,750.00		396,750.00			03-Aug-2005		5.250%		MA - 75.00%		Paid Off - 360		01-Sep-2004
120167664 2					396,750.00			03-Aug-2005		5.250%		MA - 75.00%		Paid Off - 360		01-Sep-2004
120168192 1			159,900.00		159,900.00			04-Aug-2005		6.250%		FL - 79.99%		Paid Off - 360		01-Sep-2004
120168192 1					159,900.00			04-Aug-2005		6.250%		FL - 79.99%		Paid Off - 360		01-Sep-2004
120168211 1			81,600.00		80,368.04			27-Jul-2005		6.125%		FL - 80.00%		Paid Off - 360		01-Nov-2004
120168211 1					80,368.04			27-Jul-2005		6.125%		FL - 80.00%		Paid Off - 360		01-Nov-2004
120168558 2			387,000.00		386,999.99			27-Jul-2005		6.250%		TN - 56.91%		Paid Off - 360		01-Nov-2004
120168558 2					386,999.99			27-Jul-2005		6.250%		TN - 56.91%		Paid Off - 360		01-Nov-2004
120168617 3			121,000.00		121,000.00			28-Jul-2005		6.875%		MI - 79.61%		Paid Off - 360		01-Nov-2004
120168617 3					121,000.00			28-Jul-2005		6.875%		MI - 79.61%		Paid Off - 360		01-Nov-2004
120168630 3			337,500.00		337,500.00			21-Jul-2005		6.375%		CA - 75.00%		Paid Off - 360		01-Nov-2004
120168630 3					337,500.00			21-Jul-2005		6.375%		CA - 75.00%		Paid Off - 360		01-Nov-2004
120168631 3			264,000.00		264,000.00			03-Aug-2005		6.375%		MI - 78.57%		Paid Off - 360		01-Nov-2004
120168631 3					264,000.00			03-Aug-2005		6.375%		MI - 78.57%		Paid Off - 360		01-Nov-2004
120202763 3			91,350.00		91,350.00			21-Jul-2005		7.750%		GA - 90.00%		Paid Off - 360		01-Oct-2004
120202763 3					91,350.00			21-Jul-2005		7.750%		GA - 90.00%		Paid Off - 360		01-Oct-2004
120254953 4			476,000.00		476,000.01			19-Jul-2005		5.750%		CA - 80.00%		Paid Off - 360		01-Oct-2004
120254953 4					476,000.01			19-Jul-2005		5.750%		CA - 80.00%		Paid Off - 360		01-Oct-2004
120361324 1			230,000.00		229,999.23			19-Jul-2005		5.875%		MD - 76.92%		Paid Off - 360		01-Dec-2004
120361324 1					229,999.23			19-Jul-2005		5.875%		MD - 76.92%		Paid Off - 360		01-Dec-2004
120371247 1			215,650.00		215,650.00			08-Aug-2005		6.750%		MI - 95.00%		Paid Off - 360		01-Nov-2004
120371247 1					215,650.00			08-Aug-2005		6.750%		MI - 95.00%		Paid Off - 360		01-Nov-2004
120371283 1			195,000.00		195,000.00			04-Aug-2005		6.000%		CA - 52.70%		Paid Off - 360		01-Nov-2004
120371283 1					195,000.00			04-Aug-2005		6.000%		CA - 52.70%		Paid Off - 360		01-Nov-2004
120371323 3			133,200.00		130,121.99			18-Jul-2005		6.000%		MI - 90.00%		Paid Off - 360		01-Nov-2004
120371323 3					130,121.99			18-Jul-2005		6.000%		MI - 90.00%		Paid Off - 360		01-Nov-2004
120371336 3			138,700.00		138,646.37			22-Jul-2005		6.000%		IL - 95.00%		Paid Off - 360		01-Nov-2004
120371336 3					138,646.37			22-Jul-2005		6.000%		IL - 95.00%		Paid Off - 360		01-Nov-2004
120371346 3			83,200.00		83,200.00			27-Jul-2005		7.000%		NY - 89.95%		Paid Off - 360		01-Nov-2004
120371346 3					83,200.00			27-Jul-2005		7.000%		NY - 89.95%		Paid Off - 360		01-Nov-2004
120371351 3			85,000.00		84,999.26			08-Aug-2005		6.250%		AZ - 68.00%		Paid Off - 360		01-Nov-2004
120371351 3					84,999.26			08-Aug-2005		6.250%		AZ - 68.00%		Paid Off - 360		01-Nov-2004
120371645 3			272,000.00		271,997.67			26-Jul-2005		5.725%		CA - 80.00%		Paid Off - 360		01-Nov-2004
120371645 3					271,997.67			26-Jul-2005		5.725%		CA - 80.00%		Paid Off - 360		01-Nov-2004
120372632 1			264,000.00		264,000.00			22-Jul-2005		5.125%		NJ - 80.00%		Paid Off - 360		01-Dec-2004
120372632 1					264,000.00			22-Jul-2005		5.125%		NJ - 80.00%		Paid Off - 360		01-Dec-2004
120372638 1			242,250.00		242,250.00			11-Aug-2005		6.250%		RI - 95.00%		Paid Off - 360		01-Dec-2004
120372638 1					242,250.00			11-Aug-2005		6.250%		RI - 95.00%		Paid Off - 360		01-Dec-2004
120372652 1			193,500.00		193,500.00			29-Jul-2005		6.875%		CA - 90.00%		Paid Off - 360		01-Dec-2004
120372652 1					193,500.00			29-Jul-2005		6.875%		CA - 90.00%		Paid Off - 360		01-Dec-2004
120372686 3			156,750.00		156,750.00			04-Aug-2005		6.875%		NJ - 95.00%		Paid Off - 360		01-Nov-2004
120372686 3					156,750.00			04-Aug-2005		6.875%		NJ - 95.00%		Paid Off - 360		01-Nov-2004
120372687 3			132,200.00		132,190.00			10-Aug-2005		5.625%		AL - 94.43%		Paid Off - 360		01-Nov-2004
120372687 3					132,190.00			10-Aug-2005		5.625%		AL - 94.43%		Paid Off - 360		01-Nov-2004
120372714 3			147,500.00		147,500.00			02-Aug-2005		6.000%		MD - 76.82%		Paid Off - 360		01-Dec-2004
120372714 3					147,500.00			02-Aug-2005		6.000%		MD - 76.82%		Paid Off - 360		01-Dec-2004
120372895 2			435,000.00		429,766.43			18-Jul-2005		4.500%		IL - 75.65%		Paid Off - 360		01-Nov-2004
120372895 2					429,766.43			18-Jul-2005		4.500%		IL - 75.65%		Paid Off - 360		01-Nov-2004
120373059 1			203,200.00		201,808.37			21-Jul-2005		7.500%		VA - 79.06%		Paid Off - 360		01-Nov-2004
120373059 1					201,808.37			21-Jul-2005		7.500%		VA - 79.06%		Paid Off - 360		01-Nov-2004
120373550 1			182,850.00		182,850.00			25-Jul-2005		6.250%		MI - 94.98%		Paid Off - 360		01-Dec-2004
120373550 1					182,850.00			25-Jul-2005		6.250%		MI - 94.98%		Paid Off - 360		01-Dec-2004
120373618 3			267,600.00		267,600.00			28-Jul-2005		6.250%		NJ - 80.00%		Paid Off - 360		01-Nov-2004
120373618 3					267,600.00			28-Jul-2005		6.250%		NJ - 80.00%		Paid Off - 360		01-Nov-2004
120374104 1			132,800.00		132,800.00			11-Aug-2005		4.750%		AZ - 80.00%		Paid Off - 360		01-Dec-2004
120374104 1					132,800.00					4.750%		AZ - 80.00%		Paid Off - 360


Page 16 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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

120375359 1			42,300.00		42,258.62			18-Jul-2005		6.375%		MI - 48.62%		Paid Off - 360		01-Dec-2004
			42,300.00

120375377 1			139,500.00		139,312.80			01-Aug-2005		5.875%		IN - 90.00%		Paid Off - 360		01-Dec-2004
120375377 1					139,312.80			01-Aug-2005		5.875%		IN - 90.00%		Paid Off - 360		01-Dec-2004
120375405 1			111,900.00		111,900.00			09-Aug-2005		6.250%		AL - 79.99%		Paid Off - 360		01-Dec-2004
120375405 1					111,900.00			09-Aug-2005		6.250%		AL - 79.99%		Paid Off - 360		01-Dec-2004
120375410 1			157,500.00		157,494.33			21-Jul-2005		6.250%		NH - 90.00%		Paid Off - 360		01-Dec-2004
120375410 1					157,494.33			21-Jul-2005		6.250%		NH - 90.00%		Paid Off - 360		01-Dec-2004
120375414 1			296,000.00		296,000.00			01-Aug-2005		6.375%		CA - 76.88%		Paid Off - 360		01-Dec-2004
120375414 1					296,000.00			01-Aug-2005		6.375%		CA - 76.88%		Paid Off - 360		01-Dec-2004
120375425 1			190,000.00		190,000.00			03-Aug-2005		6.250%		AZ - 95.00%		Paid Off - 360		01-Dec-2004
120375425 1					190,000.00			03-Aug-2005		6.250%		AZ - 95.00%		Paid Off - 360		01-Dec-2004
120375646 3			95,000.00		95,000.00			02-Aug-2005		6.875%		FL - 74.22%		Paid Off - 360		01-Dec-2004
120375646 3					95,000.00			02-Aug-2005		6.875%		FL - 74.22%		Paid Off - 360		01-Dec-2004
120375658 3			125,900.00		125,860.66			29-Jul-2005		6.250%		PA - 71.17%		Paid Off - 360		01-Dec-2004
120375658 3					125,860.66			29-Jul-2005		6.250%		PA - 71.17%		Paid Off - 360		01-Dec-2004
120376557 3			284,800.00		284,800.00			01-Aug-2005		5.500%		VA - 80.00%		Paid Off - 360		01-Dec-2004
120376557 3					284,800.00			01-Aug-2005		5.500%		VA - 80.00%		Paid Off - 360		01-Dec-2004
120421188 1			96,805.00		96,805.00			10-Aug-2005		7.125%		AZ - 95.00%		Paid Off - 360		01-Jan-2005
120421188 1					96,805.00			10-Aug-2005		7.125%		AZ - 95.00%		Paid Off - 360		01-Jan-2005
120428469 1			260,800.00		260,800.00			20-Jul-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120428469 1					260,800.00			20-Jul-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120441925 1			87,121.00		87,121.00			21-Jul-2005		5.625%		AZ - 80.00%		Paid Off - 360		01-Dec-2004
120441925 1					87,121.00			21-Jul-2005		5.625%		AZ - 80.00%		Paid Off - 360		01-Dec-2004
120445587 1			246,400.00		246,400.00			04-Aug-2005		4.750%		MD - 80.00%		Paid Off - 360		01-Dec-2004
120445587 1					246,400.00			04-Aug-2005		4.750%		MD - 80.00%		Paid Off - 360		01-Dec-2004
120465521 3			359,000.00		355,258.14			10-Aug-2005		5.875%		NH - 85.48%		Paid Off - 360		01-Oct-2004
120465521 3					355,258.14			10-Aug-2005		5.875%		NH - 85.48%		Paid Off - 360		01-Oct-2004
120486264 4			383,200.00		383,200.00			15-Aug-2005		6.000%		FL - 79.94%		Paid Off - 360		01-Feb-2005
120486264 4					383,200.00			15-Aug-2005		6.000%		FL - 79.94%		Paid Off - 360		01-Feb-2005
120493651 1			146,800.00		146,800.00			08-Aug-2005		5.375%		AZ - 80.00%		Paid Off - 360		01-Dec-2004
120493651 1					146,800.00			08-Aug-2005		5.375%		AZ - 80.00%		Paid Off - 360		01-Dec-2004
120507648 2			460,000.00		460,000.00			28-Jul-2005		5.750%		WI - 80.00%		Paid Off - 360		01-Jan-2005
120507648 2					460,000.00			28-Jul-2005		5.750%		WI - 80.00%		Paid Off - 360		01-Jan-2005
120523510 4			374,550.00		374,550.00			28-Jul-2005		5.750%		VA - 80.00%		Paid Off - 360		01-Feb-2005
120523510 4					374,550.00			28-Jul-2005		5.750%		VA - 80.00%		Paid Off - 360		01-Feb-2005
120526956 4			432,000.00		432,000.00			12-Aug-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120526956 4					432,000.00			12-Aug-2005		5.500%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120538720 2			900,000.00		893,782.27			10-Aug-2005		6.125%		CA - 67.93%		Paid Off - 360		01-Jan-2005
120538720 2					893,782.27			10-Aug-2005		6.125%		CA - 67.93%		Paid Off - 360		01-Jan-2005
120544535 3			283,200.00		283,200.00			22-Jul-2005		6.625%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120544535 3					283,200.00			22-Jul-2005		6.625%		CA - 80.00%		Paid Off - 360		01-Jan-2005
120555966 1			234,636.00		234,636.00			21-Jul-2005		5.375%		NV - 80.00%		Paid Off - 360		01-Jan-2005
120555966 1					234,636.00			21-Jul-2005		5.375%		NV - 80.00%		Paid Off - 360		01-Jan-2005
120570928 1			352,000.00		352,000.00			19-Jul-2005		7.000%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120570928 1					352,000.00			19-Jul-2005		7.000%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120580361 1			96,000.00		96,000.00			27-Jul-2005		5.875%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120580361 1					96,000.00			27-Jul-2005		5.875%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120596734 1			203,109.00		203,109.00			27-Jul-2005		5.250%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120596734 1					203,109.00			27-Jul-2005		5.250%		AZ - 80.00%		Paid Off - 360		01-Feb-2005
120597512 3			168,000.00		168,000.00			21-Jul-2005		5.875%		FL - 76.36%		Paid Off - 360		01-Feb-2005
120597512 3					168,000.00			21-Jul-2005		5.875%		FL - 76.36%		Paid Off - 360		01-Feb-2005
120598958 1			311,052.00		311,051.99			04-Aug-2005		5.500%		CO - 80.00%		Paid Off - 360		01-Jan-2005
120598958 1					311,051.99			04-Aug-2005		5.500%		CO - 80.00%		Paid Off - 360		01-Jan-2005
120611852 3			349,232.00		349,232.00			19-Jul-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120611852 3					349,232.00			19-Jul-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120613481 4			585,600.00		581,615.97			15-Aug-2005		6.250%		CO - 80.00%		Paid Off - 360		01-Jan-2005
120613481 4					581,615.97			15-Aug-2005		6.250%		CO - 80.00%		Paid Off - 360		01-Jan-2005
120628141 4			498,400.00		498,390.00			01-Aug-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120628141 4					498,390.00			01-Aug-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120629079 3			182,000.00		181,900.00			11-Aug-2005		5.125%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120629079 3					181,900.00			11-Aug-2005		5.125%		WA - 80.00%		Paid Off - 360		01-Jan-2005
120641293 1			189,600.00		189,600.00			21-Jul-2005		6.500%		FL - 80.00%		Paid Off - 360		01-Feb-2005
120641293 1					189,600.00			21-Jul-2005		6.500%		FL - 80.00%		Paid Off - 360		01-Feb-2005
120642097 2			386,400.00		386,400.00			15-Aug-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120642097 2					386,400.00			15-Aug-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120647165 2			478,954.00		476,312.53			22-Jul-2005		6.500%		CA - 72.02%		Paid Off - 360		01-Feb-2005
120647165 2					476,312.53			22-Jul-2005		6.500%		CA - 72.02%		Paid Off - 360		01-Feb-2005
120654053 4			376,000.00		376,000.00			26-Jul-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Dec-2004
120654053 4					376,000.00			26-Jul-2005		5.625%		CA - 80.00%		Paid Off - 360		01-Dec-2004
120654057 2			489,600.00		489,600.00			04-Aug-2005		4.750%		CA - 80.00%		Paid Off - 360		01-Dec-2004
120654057 2					489,600.00			04-Aug-2005		4.750%		CA - 80.00%		Paid Off - 360		01-Dec-2004
120666283 4			521,600.00		518,519.12			05-Aug-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120666283 4					518,519.12			05-Aug-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120692628 3			349,000.00		349,000.00			19-Jul-2005		5.625%		NV - 73.47%		Paid Off - 360		01-Feb-2005
120692628 3					349,000.00					5.625%		NV - 73.47%		Paid Off - 360


Page 17 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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

120693234 1			146,400.00		145,400.00			15-Aug-2005		5.500%		FL - 80.00%		Paid Off - 360		01-Feb-2005
			146,400.00

120693392 1			285,600.00		285,600.00			02-Aug-2005		5.875%		IL - 80.00%		Paid Off - 360		01-Feb-2005
120693392 1					285,600.00			02-Aug-2005		5.875%		IL - 80.00%		Paid Off - 360		01-Feb-2005
120706500 4			544,000.00		544,000.00			04-Aug-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120706500 4					544,000.00			04-Aug-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120716072 4			580,000.00		580,000.00			27-Jul-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120716072 4					580,000.00			27-Jul-2005		5.875%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120717380 4			391,300.00		391,300.00			01-Aug-2005		5.750%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120717380 4					391,300.00			01-Aug-2005		5.750%		CA - 80.00%		Paid Off - 360		01-Feb-2005
120718925 2			625,000.00		625,000.00			25-Jul-2005		5.125%		CA - 62.50%		Paid Off - 360		01-Jan-2005
120718925 2					625,000.00			25-Jul-2005		5.125%		CA - 62.50%		Paid Off - 360		01-Jan-2005
120725607 1			93,575.00		93,571.88			15-Aug-2005		6.000%		IN - 95.00%		Paid Off - 360		01-Feb-2005
120725607 1					93,571.88			15-Aug-2005		6.000%		IN - 95.00%		Paid Off - 360		01-Feb-2005
120757408 1			360,000.00		360,000.00			21-Jul-2005		6.750%		NY - 80.00%		Paid Off - 360		01-Feb-2005
120757408 1					360,000.00			21-Jul-2005		6.750%		NY - 80.00%		Paid Off - 360		01-Feb-2005
120168584 1		BK	150,000.00		149,960.94			18-Jul-2005		6.250%		MI - 71.77%		Repur/Subs - 360		01-Oct-2004
120168584 1		BK			149,960.94			18-Jul-2005		6.250%		MI - 71.77%		Repur/Subs - 360		01-Oct-2004
120372634 1			120,650.00		120,616.70			18-Jul-2008		6.625%		VA - 94.96%		Repur/Subs - 360		01-Nov-2004
120372634 1					120,616.70			18-Jul-2008		6.625%		VA - 94.96%		Repur/Subs - 360		01-Nov-2004


TOTAL			22,399,959.00		22,361,285.76
TOTAL


Page 18 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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 19 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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%












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IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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 21 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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 22 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 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														90.264745%
Next Senior Percentage														89.887995%
Current Subordinate Percentage														9.735255%
Next Subordinate Percentage														10.112005%
Senior Prepayment Percentage														100.000000%
Next Senior Prepayment Percentage														100.000000%
Subordinate Prepayment Percentage														0.000000%
Next Subordinate Prepayment Percentage														0.000000%




Page 23 of 24
IndyMac INDX Mortgage Loan Trust 2005-AR1

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

August 25, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
						Group 4		Group 3		Group 2		Group 1		Total
Current Scheduled Payments														2,933,436.40
Current Scheduled Payments 1 Month Prior														3,056,932.42
Current Scheduled Payments 2 Month Prior														3,181,988.60
Current Scheduled Payments 3 Month Prior														3,267,934.02
Current Scheduled Payments 4 Month Prior														3,348,670.91
Current Scheduled Payments 5 Month Prior														3,419,843.70
Current Scheduled Payments 6 Month Prior														3,461,787.79
Current Scheduled Payments 7 Month Prior														0.00
Current Scheduled Payments 8 Month Prior														0.00
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 24 of 24

IndyMac INDX Mortgage Loan Trust 2005-AR1 8-K