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): ~~September~~December 27, 2004 (Date of earliest event reported) Indymac MBS Inc (as Depositor under the Pooling and Servicing Agreement, dated as February 1, 2004, providing for the issuance of Residential Asset Securitization Trust Series 2004-A1 Mortgage Pass-Through Certificates, Series 2004-A) (Exact name of registrant as specified in charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-102888-17 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 ~~September~~December 27, 2004. 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: ~~Sep~~Dec 27, 2004 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT 99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~September~~December 27, 2004.

	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	September 27, 2004 Distribution
	December 27, 2004 Distribution
	Contents
			TABLE OF CONTENTS
								Page
			1.	Contents				1
			2.	Certificate Payment Report				2
			3.	Collection Account Report				4
			4.	Credit Enhancement Report				7
			5.	Collateral Report				8
			6.	Delinquency Report				11
			7.	REO Report				12
			8.	Prepayment Report				13
			9.	Prepayment Detail Report				16
			10.	Realized Loss Report				17
			11.	Realized Loss Detail Report				20
			12.	Triggers, Adj. Rate Cert. and Miscellaneous Report				21
			13.	Other Related Information				22
			14.	Additional Certificate Report				23
				Total Number of Pages				23
			CONTACTS
				Administrator: Brent Hoyler
				Direct Phone Number: (714)247-6322
				Address: Deutsche Bank
				1761 E. St. Andrew Place, Santa Ana, CA 92705
				Web Site: https://www.corporatetrust.db.com/invr
				Web Site: https://www.tss.db.com/invr
				Factor Information: (800) 735-7777
				Main Phone Number: (714) 247-6000
ISSUANCE INFORMATION
	Seller:		IndyMac Bank					Cut-Off Date: ~~December~~February 1, ~~2003~~2004
	Certificate Insurer(s):		MBIA Insurance Corporation					Closing Date: ~~December~~February 2926, ~~2003~~2004
								First Payment Date: March 25, 2004
	Servicer(s):		IndyMac Bank Master Servicer
								Distribution Date: September 27, 2004
								Distribution Date: December 27, 2004
	Underwriter(s):		Goldman, Sachs & Co. Underwriter					Record Date: ~~August~~November 3130, 2004
						Page 1 of 23					© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Certificate Payment Report for September 27, 2004 Distribution
	Certificate Payment Report for December 27, 2004 Distribution
	Distribution in Dollars - Current Period
					Prior						Current
	Class	Original			Principal			Total	Realized	Deferred	Principal
Class	Type	Face Value			Balance	Interest	Principal	Distribution	Losses	Interest	Balance
					(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
A-1		171,407,455.00			~~141~~103,~~432~~616,~~672~~221.1244	~~618~~453,~~767~~320.9497	153,~~464~~535,~~442~~672.7766	163,~~083~~988,~~210~~993.7163	-	-	~~125~~100,~~968~~080,~~229~~548.3478
A-2		38,090,545.00			3123,~~429~~025,~~482~~826.2365	5551,~~394~~436.4643	3785,~~436,542~~705.7902	3837,~~491,937~~141.2545	-	-	2722,~~992~~240,~~939~~121.4563
A-3		-			-	~~154~~102,~~135~~069.4208	-	~~154~~102,~~135~~069.4208	-	-	-
A-4		4,000,000.00			4,000,000.00	19,166.67	-	19,166.67	-	-	4,000,000.00
A-5		25,000,000.00			25,000,000.00	114,583.33	-	114,583.33	-	-	25,000,000.00
A-6		-			-	5,208.33	-	5,208.33	-	-	-
PO		863,244.00			~~833~~814,~~637~~297.3337	-	1,~~191~~143.1376	1,~~191~~143.1376	-	-	~~832~~813,~~446~~153.2061
A-X		-			-	7950,~~483~~060.0482	-	7950,~~483~~060.0482	-	-	-
A-R		100.00			-	-	-	-	-	-	-
B-1		5,640,000.00			5,~~608~~270,~~007~~286.4023	2625,~~871~~253.7045	~~314~~5,~~820~~334.7601	~~341~~30,~~692~~587.46	-	-	5,~~293~~264,~~186~~952.6422
B-2		1,880,000.00			1,~~869~~756,~~335~~762.8008	8,~~957~~417.2382	~~104~~1,~~940~~778.2500	~~113~~10,~~897~~195.4882	-	-	1,~~764~~754,~~395~~984.5507
B-3		1,127,000.00			1,~~120~~053,~~607~~122.1580	5,~~369~~046.5821	621,~~908~~065.3386	686,~~277~~112.9107	-	-	1,~~057~~052,~~698~~056.8294
B-4		878,000.00			~~873~~820,~~019~~445.5927	43,~~183~~931.2230	~~49,009~~830.3336	534,~~192~~761.5566	-	-	~~824~~819,~~010~~614.2690
B-5		626,000.00			~~622~~584,~~449~~964.0539	2,~~982~~802.5795	~~34,942~~592.8704	373,~~925~~394.4499	-	-	~~587~~584,~~506~~372.1836
B-6		1,128,620.00			1,~~122~~054,~~217~~636.9863	5,~~377~~053.2947	621,~~998~~067.7638	686,~~376~~120.0585	-	-	1,~~059~~053,~~219~~569.2324
P		100.00			100.00	-	-	-	-	-	100.00
Total		250,641,064.00			~~213~~166,~~911~~996,~~528~~662.6685	1846,~~100,480~~350.7883	194,~~531~~333,~~797~~189.0009	205,~~632~~179,~~277~~539.7892	-	-	~~194~~162,~~379~~663,~~731~~473.6676
	Interest Accrual Detail				Current Period Factor Information per $1,000 of Original Face
						Orig. Principal	Prior				Current
	Period	Period				(with Notional)	Principal			Total	Principal
Class	Starting	Ending		Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
							(1)	(2)	(3)	(4)=(2)+(3)	(5)
A-1				F-30/360	45660NZE8	171,407,455.00	~~825~~604.~~125559~~502421	32.~~609924~~644698	9020.~~220363~~627298	9323.~~830287~~271996	~~734~~583.~~905196~~875122
A-2				A-30/360	45660NZF5	38,090,545.00	~~825~~604.~~125559~~502421	1.~~454284~~350373	9020.~~220363~~627298	9121.~~674647~~977671	~~734~~583.~~905196~~875122
A-3				A-30/360	45660NZG3	38,090,545.00	~~825~~604.~~125559~~502421	42.~~046553~~679643	-	42.~~046553~~679643	~~734~~583.~~905196~~875122
A-4				F-30/360	45660NZH1	4,000,000.00	1,000.000000	4.791668	-	4.791668	1,000.000000
A-5				F-30/360	45660NZJ7	25,000,000.00	1,000.000000	4.583333	-	4.583333	1,000.000000
A-6				F-30/360	45660NZK4	25,000,000.00	1,000.000000	0.208333	-	0.208333	1,000.000000
PO				F-30/360	45660NZM0	863,244.00	~~965~~943.~~703011~~299195	-	1.~~379830~~324956	1.~~379830~~324956	~~964~~941.~~323181~~974239
A-X				A-30/360	45660NZN8	208,823,470.00	~~838~~617.~~925965~~875635	0.~~380623~~239728	-	0.~~380623~~239728	~~746~~597.~~837819~~337409
A-R				F-30/360	45660NZP3	100.00	-	-	-	-	-
B-1				F-30/360	45660NZQ1	5,640,000.00	~~994~~934.~~327553~~447913	4.~~764486~~477562	550.~~819284~~945746	605.~~583770~~423308	~~938~~933.~~508269~~502167
B-2				F-30/360	45660NZR9	1,880,000.00	~~994~~934.~~327553~~447913	4.~~764484~~477564	550.~~819284~~945746	605.~~583768~~423310	~~938~~933.~~508269~~502167
B-3				F-30/360	45660NZS7	1,127,000.00	~~994~~934.~~327553~~447913	4.~~764490~~477560	550.~~819284~~945746	605.~~583774~~423306	~~938~~933.~~508269~~502167
B-4				F-30/360	45660NZT5	878,000.00	~~994~~934.~~327553~~447913	4.~~764487~~477563	550.~~819284~~945746	605.~~583771~~423308	~~938~~933.~~508269~~502167
B-5				F-30/360	45660NZU2	626,000.00	~~994~~934.~~327553~~447913	4.~~764489~~477556	550.~~819284~~945746	605.~~583773~~423302	~~938~~933.~~508269~~502167
B-6				F-30/360	45660NZV0	1,128,620.00	~~994~~934.~~327570~~447932	4.~~764482~~477566	550.~~819281~~945741	605.~~583763~~423307	~~938~~933.~~508289~~502191
P				F-30/360	IN04011P1	100.00	1,000.000000	-	-	-	1,000.000000
							Page 2 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Certificate Payment Report for September 27, 2004 Distribution
	Certificate Payment Report for December 27, 2004 Distribution
	Distribution in Dollars - to Date
											Current
	Original				Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal
Class	Face Value		Interest		Principal	Principal	Principal	Distribution	Losses	Interest	Balance
	(1)		(2)		(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
A-1	171,407,455.00		46,~~767~~249,~~271~~885.7287		3460,~~885~~010,~~717~~046.1227	1011,~~553~~316,~~508~~859.5395	4571,~~439~~326,~~225~~906.6622	5077,~~206~~576,~~497~~792.3809	-	-	~~125~~100,~~968~~080,~~229~~548.3478
A-2	38,090,545.00		~~350~~506,~~870~~128.5930		713,~~752~~335,~~381~~565.4764	2,~~345~~514,~~224~~857.0873	1015,~~097~~850,~~605~~423.5537	1016,~~448~~356,~~476~~551.1467	-	-	2722,~~992~~240,~~939~~121.4563
A-3	-		1,~~263~~610,~~443~~235.6011		-	-	-	1,~~263~~610,~~443~~235.6011	-	-	-
A-4	4,000,000.00		~~134~~191,~~166~~666.6970		-	-	-	~~134~~191,~~166~~666.6970	-	-	4,000,000.00
A-5	25,000,000.00		~~802~~1,~~083~~145,833.3130		-	-	-	~~802~~1,~~083~~145,833.3130	-	-	25,000,000.00
A-6	-		3652,~~458~~083.3130		-	-	-	3652,~~458~~083.3130	-	-	-
PO	863,244.00		-		-	3050,~~797~~090.8039	3050,~~797~~090.8039	3050,~~797~~090.8039	-	-	~~832~~813,~~446~~153.2061
A-X	-		~~618~~786,~~034~~977.3666		-	-	-	~~618~~786,~~034~~977.3666	-	-	-
A-R	100.00		0.4849		88.94	11.06	100.00	100.4849	-	-	-
B-1	5,640,000.00		~~188~~264,~~642~~599.3701		~~152~~178,~~378~~833.5392	~~194~~196,~~434~~213.8386	~~346~~375,~~813~~047.3678	~~535~~639,~~455~~646.7379	-	-	5,~~293~~264,~~186~~952.6422
B-2	1,880,000.00		6288,~~880~~199.7867		5059,~~792~~611.8431	6465,~~811~~404.6162	~~115~~125,~~604~~015.4593	~~178~~213,~~485~~215.2360	-	-	1,~~764~~754,~~395~~984.5507
B-3	1,127,000.00		3752,~~695~~872.0490		3035,~~448~~735.6908	3839,~~852~~207.4998	6974,~~301~~943.1806	~~106~~127,~~996~~815.2296	-	-	1,~~057~~052,~~698~~056.8294
B-4	878,000.00		2941,~~366~~191.6712		2327,~~721~~839.3475	30,~~268~~545.4035	5358,~~989~~385.7410	8399,~~356~~576.4122	-	-	~~824~~819,~~010~~614.2690
B-5	626,000.00		2029,~~937~~368.9761		1619,~~912~~849.9430	21,~~580~~778.8935	3841,~~493~~627.8264	5970,~~431~~996.7925	-	-	~~587~~584,~~506~~372.1836
B-6	1,128,620.00		3752,~~749~~948.2089		3035,~~492~~786.4442	3839,~~908~~264.34	6975,~~400~~050.7776	~~107~~127,~~149~~999.9765	-	-	1,~~059~~053,~~219~~569.2324
P	100.00		2960,~~689~~954.9990		-	-	-	2960,~~689~~954.9990	-	-	100.00
Total	250,641,064.00		811,~~379~~132,~~291~~945.0883		4273,~~942~~703,~~934~~356.3161	1314,~~318~~274,~~398~~233.0363	5687,~~261~~977,~~332~~590.3424	6499,~~640~~110,~~623~~536.4207	-	-	~~194~~162,~~379~~663,~~731~~473.6676
	Interest Detail
	Pass-	Prior Principal				Non-	Prior	Unscheduled		Paid or	Current
	Through	(with Notional)			Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid
Class	Rate	Balance			Interest	Interest SF	Interest	Adjustments	Interest	Interest	Interest
					(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
A-1	5.25000%	~~141~~103,~~432~~616,~~672~~221.1244			~~618~~453,~~767~~320.9497	-	-	-	~~618~~453,~~767~~320.9497	~~618~~453,~~767~~320.9497	-
A-2	2.~~11500~~68063%	3123,~~429~~025,~~482~~826.2365			5551,~~394~~436.4643	-	-	-	5551,~~394~~436.4643	5551,~~394~~436.4643	-
A-3	5.~~88500~~31937%	3123,~~429~~025,~~482~~826.2365			~~154~~102,~~135~~069.4208	-	-	-	~~154~~102,~~135~~069.4208	~~154~~102,~~135~~069.4208	-
A-4	5.75000%	4,000,000.00			19,166.67	-	-	-	19,166.67	19,166.67	-
A-5	5.50000%	25,000,000.00			114,583.33	-	-	-	114,583.33	114,583.33	-
A-6	0.25000%	25,000,000.00			5,208.33	-	-	-	5,208.33	5,208.33	-
PO		~~833~~814,~~637~~297.3337			-	-	-	-	-	-	-
A-X	0.~~54444~~46558%	~~175~~129,~~187~~026,~~431~~934.0513			7950,~~483~~060.0482	-	-	-	7950,~~483~~060.0482	7950,~~483~~060.0482	-
A-R	5.75000%	-			-	-	-	-	-	-	-
B-1	5.75000%	5,~~608~~270,~~007~~286.4023			2625,~~871~~253.7045	-	-	-	2625,~~871~~253.7045	2625,~~871~~253.7045	-
B-2	5.75000%	1,~~869~~756,~~335~~762.8008			8,~~957~~417.2382	-	-	-	8,~~957~~417.2382	8,~~957~~417.2382	-
B-3	5.75000%	1,~~120~~053,~~607~~122.1580			5,~~369~~046.5821	-	-	-	5,~~369~~046.5821	5,~~369~~046.5821	-
B-4	5.75000%	~~873~~820,~~019~~445.5927			43,~~183~~931.2230	-	-	-	43,~~183~~931.2230	43,~~183~~931.2230	-
B-5	5.75000%	~~622~~584,~~449~~964.0539			2,~~982~~802.5795	-	-	-	2,~~982~~802.5795	2,~~982~~802.5795	-
B-6	5.75000%	1,~~122~~054,~~217~~636.9863			5,~~377~~053.2947	-	-	-	5,~~377~~053.2947	5,~~377~~053.2947	-
P		100.00			-	-	-	-	-	-	-
Total		~~445~~344,~~528~~049,~~441~~423.9463			1846,~~100,480~~350.7883	-	-	-	1846,~~100,480~~350.7883	1846,~~100,480~~350.7883	-
							Page 3 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report for December 27, 2004 Distribution
	Collection Account Report
SUMMARY								TOTAL
	Principal Collections							194,~~531~~333,~~797~~189.0009
	Principal Withdrawals							0.00
	Principal Other Accounts							0.00
	TOTAL PRINCIPAL							194,~~531~~333,~~797~~189.0009
	Interest Collections							1853,~~115,735~~070.2158
	Interest Withdrawals							0.00
	Interest Other Accounts							0.00
	Intrest Fees							(156,~~254~~719.4375)
	TOTAL INTEREST							1846,~~100,480~~350.7883
	TOTAL AVAILABLE FUNDS TO BONDHOLDERS							205,~~632~~179,~~277~~539.7892
	Interest Payable to Bondholders							1846,~~100,480~~350.7883
PRINCIPAL - COLLECTIONS								TOTAL
	Scheduled Principal							~~195~~169,~~788~~258.8717
	Curtailments							1423,~~856~~376.4375
	Prepayments in Full							74,~~554~~140,~~170~~554.9917
	Repurchases/Substitutions							~~11,766,980~~0.7100
	Liquidations							0.00
	Insurance Principal							0.00
	Other Additional Principal							0.00
	LESS: Delinquent Principal							(~~161~~150,~~190~~816.6534)
	LESS: Realized Losses							0.00
	PLUS: Recoveries							0.00
	PLUS: Substitution Shortfall Principal							0.00
	PLUS: Principal Loan Adjustments							0.00
	PLUS: Principal Advanced							~~161~~150,~~190~~816.6534
	TOTAL PRINCIPAL							194,~~531~~333,~~797~~189.0009
				Page 4 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report for December 27, 2004 Distribution
	Collection Account Report
PRINCIPAL - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
PRINCIPAL - OTHER ACCOUNTS								TOTAL
	TOTAL PRINCIPAL OTHER ACCOUNTS							0.00
INTEREST - COLLECTIONS								TOTAL
	Scheduled Interest							1890,~~088,470~~209.2488
	Repurchases/Substitutions							~~68,560~~0.1600
	Liquidations							0.00
	Insurance Interest							0.00
	Other Additional Interest							0.00
	LESS: Prepayment Interest Shortfalls							(45,~~743~~990.7000)
	LESS: Delinquent Interest							(~~870~~783,~~121~~246.9204)
	LESS: Interest Realized Losses							0.00
	PLUS: Compensating Interest							45,~~743~~990.7000
	LESS: Civil Relief Act Shorfalls							0.00
	PLUS: Substiution Shortfall Interest							0.00
	PLUS: Interest Loan Adjustments							0.00
	LESS: Excess, Special Hazard, Fraud, & Bankruptcy Interest Losses							0.00
	Interest Advanced							~~828~~746,~~826~~106.7374
	TOTAL INTEREST							1853,~~115,735~~070.2158
				Page 5 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collection Account Report for September 27, 2004 Distribution
	Collection Account Report for December 27, 2004 Distribution
	Collection Account Report
INTEREST - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - OTHER ACCOUNTS								TOTAL
	Prepayment Penalties							0.00
	TOTAL INTEREST OTHER ACCOUNTS							0.00
INTEREST - FEES								TOTAL
	Current Servicing Fees							135,~~488~~178.9623
	Trustee Fees							1713.8392
	PMI Fees							1,~~747~~527.6561
	TOTAL INTEREST FEES							156,~~254~~719.4375
				Page 6 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Credit Enhancement Report for September 27, 2004 Distribution
	Credit Enhancement Report for December 27, 2004 Distribution
	Credit Enhancement Report
ACCOUNTS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INSURANCE								TOTAL
SPACE INTENTIONALLY LEFT BLANK
STRUCTURAL FEATURES								TOTAL
SPACE INTENTIONALLY LEFT BLANK
				Page 7 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collateral Report for September 27, 2004 Distribution
	Collateral Report for December 27, 2004 Distribution
	Collateral Report
COLLATERAL								TOTAL
	Loan Count:
	Original							576
	Prior							~~495~~389
	Prefunding							-
	Scheduled Paid Offs							-
	Full Voluntary Prepayments							(149)
	Repurchases							~~(26)~~-
	Liquidations							-
	Current							~~455~~380
	Principal Balance:
	Original							250,421,670.30
	Prior							~~213~~166,~~911~~996,~~430~~564.1433
	Prefunding							-
	Scheduled Principal							(~~195~~169,~~788~~258.8717)
	Partial and Full Voluntary Prepayments							(74,~~569~~163,~~027~~930.4292)
	Repurchases							~~(11,766,980.71)~~-
	Liquidations							-
	Current							~~194~~162,~~379~~663,~~633~~375.1424
PREFUNDING								TOTAL
SPACE INTENTIONALLY LEFT BLANK
Current Prin Balance by Groups (in millions of dollars)					Total Current Principal Balance (in millions of dollars)
				Page 8 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collateral Report for September 27, 2004 Distribution
	Collateral Report for December 27, 2004 Distribution
	Collateral Report
CHARACTERISTICS								TOTAL
	Weighted Average Coupon Original							6.515744%
	Weighted Average Coupon Prior							6.~~497006~~408729%
	Weighted Average Coupon Current							6.~~490707~~396849%
	Weighted Average Months to Maturity Original							352
	Weighted Average Months to Maturity Prior							~~347~~344
	Weighted Average Months to Maturity Current							~~346~~343
	Weighted Avg Remaining Amortization Term Original							352
	Weighted Avg Remaining Amortization Term Prior							~~346~~343
	Weighted Avg Remaining Amortization Term Current							~~346~~342
	Weighted Average Seasoning Original							7.24
	Weighted Average Seasoning Prior							1115.7714
	Weighted Average Seasoning Current							1316.0602
Note: Original information refers to deal issue.
WAC by Groups					Total WAC
WARAT by Groups					Total WARAT
Note: Dates correspond to distribution dates.
				Page 9 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Collateral Report for September 27, 2004 Distribution
	Collateral Report for December 27, 2004 Distribution
	Collateral Report
ARM CHARACTERISTICS								TOTAL
	Weighted Average Margin Original							0.000%
	Weighted Average Margin Prior							0.000%
	Weighted Average Margin Current							0.000%
	Weighted Average Max Rate Original							0.000%
	Weighted Average Max Rate Prior							0.000%
	Weighted Average Max Rate Current							0.000%
	Weighted Average Min Rate Original							0.000%
	Weighted Average Min Rate Prior							0.000%
	Weighted Average Min Rate Current							0.000%
	Weighted Average Cap Up Original							0.000%
	Weighted Average Cap Up Prior							0.000%
	Weighted Average Cap Up Current							0.000%
	Weighted Average Cap Down Original							0.000%
	Weighted Average Cap Down Prior							0.000%
	Weighted Average Cap Down Current							0.000%
Note: Original information refers to deal issue.
SERVICING FEES / ADVANCES								TOTAL
	Current Servicing Fees							135,~~488~~178.9623
	Delinquent Servicing Fees							4137,~~295~~139.1930
	TOTAL SERVICING FEES							5442,~~784~~317.1553
	Total Servicing Fees							5442,~~784~~317.1553
	Compensating Interest							(45,~~743~~990.7000)
	Delinquent Servicing Fees							(4137,~~295~~139.1930)
	COLLECTED SERVICING FEES							~~8,745~~(811.2677)
	Total Advanced Principal For Current Payment Date							~~161~~150,~~190~~816.6534
	Total Advanced Interest For Current Payment Date							~~828~~746,~~826~~106.7374
	TOTAL ADVANCES FOR CURRENT PERIOD							~~990~~896,~~017~~923.3808
ADDITIONAL COLLATERAL INFORMATION								TOTAL
	Prepayment Interest Shortfall (PPIS)							45,~~743~~990.7000
	Compensating Interest							(45,~~743~~990.7000)
	Net Prepayment Interest Shortfall (Net PPIS)							0.00
	Weighted Average Net Mortgage Rate							6.~~172576~~080788%
				Page 10 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Delinquency Report for September 27, 2004 Distribution
	Delinquency Report for December 27, 2004 Distribution
	Delinquency Report - Total
				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		###########	3,~~075~~309,~~814~~462.1254	~~376,721.14~~-	~~494~~517,~~598~~822.9977	3,~~947~~827,~~134~~285.2531
		% Balance		8187.0348%	12.5803%	0.1900%	0.2532%	2.0335%
		# Loans		~~365~~325	78	1-	2	10
		% # Loans		8085.2253%	12.5411%	0.2200%	0.4453%	2.2063%
FORECLOSURE		Balance		-420,957.94	-166,524.68	~~166,894.04~~-	-	~~166~~587,~~894~~482.0462
		% Balance		0.0026%	0.0010%	0.0900%	0.00%	0.0936%
		# Loans		-1	-1	1-	-	12
		% # Loans		0.0026%	0.0026%	0.2200%	0.00%	0.2253%
BANKRUPTCY		Balance		-	-	-	-	-
		% Balance		0.00%	0.00%	0.00%	0.00%	0.00%
		# Loans		-	-	-	-	-
		% # Loans		0.00%	0.00%	0.00%	0.00%	0.00%
REO		Balance		-	-	-	-	-
		% Balance		0.00%	0.00%	0.00%	0.00%	0.00%
		# Loans		-	-	-	-	-
		% # Loans		0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL		Balance		-420,957.94	3,~~075~~475,~~814~~987.1222	~~543,615.18~~-	~~494~~517,~~598~~822.9977	4,~~114~~414,~~028~~767.2993
		% Balance		0.0026%	12.5814%	0.2800%	0.2532%	2.1271%
		# Loans		-1	79	2-	2	1112
		% # Loans		0.0026%	12.5437%	0.4400%	0.4453%	23.4216%
Note: <1 Payment = 1-30days, 1 Payment = 31-60days, 2 Payments = 61-90days, 3+ Payments = 91+
								6 Months Moving Average
1 or 2 Payments Delinquent					3 or More Payments Delinquent
Total Foreclosure					Total Bankruptcy and REO
Note: Dates correspond to distribution dates.
				Page 11 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	REO Report for September 27, 2004 Distribution
	REO Report for December 27, 2004 Distribution
	REO Report - Mortgage Loans that Become REO During Current Distribution
SUMMARY				LOAN GROUP
Total Loan Count = 0				Loan Group 1 = Group 1; REO Book Value = 000.00
Total Original Principal Balance = 000.00
Total Current Balance = 000.00
REO Book Value = 000.00
REO Book Value reported corresponds to total REO loans, including loans that become REO during current distribution.
Loan Number		Original	Stated		Current	State &
&		Principal	Principal	Paid to	Note	LTV at	Original	Origination
Loan Group		Balance	Balance	Date	Rate	Origination	Term	Date
SPACE INTENTIONALLY LEFT BLANK
				Page 12 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report for December 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENTS								TOTAL
	Current
	Number of Paid in Full Loans							149
	Number of Repurchased Loans							26-
	Total Number of Loans Prepaid in Full							409
	Paid in Full Balance							74,~~554~~140,~~170~~554.9917
	Repurchased Loans Balance							~~11,766,980.71~~-
	Curtailments Amount							1423,~~856~~376.4375
	Total Prepayment Amount							194,~~336~~163,~~008~~930.1392
	Cumulative
	Number of Paid in Full Loans							95168
	Number of Repurchased Loans							2628
	Total Number of Loans Prepaid in Full							~~121~~196
	Paid in Full Balance							4273,~~499~~222,~~653~~006.8633
	Repurchased Loans Balance							1112,~~766~~187,~~980~~032.7189
	Curtailments Amount							~~247~~301,~~366~~545.7342
	Total Prepayment Amount							5485,~~514~~710,~~001~~584.3064
SPACE INTENTIONALLY LEFT BLANK
Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)
				Page 13 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report for December 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENT RATES								TOTAL
	SMM							92.0550%
	3 Months Avg SMM							45.4067%
	12 Months Avg SMM
	Avg SMM Since Cut-off							34.4613%
	CPR							6726.9516%
	3 Months Avg CPR							4150.7438%
	12 Months Avg CPR
	Avg CPR Since Cut-off							3439.4973%
	PSA							~~2601~~816.8380%
	3 Months Avg PSA Approximation							~~1755~~1666.8992%
	12 Months Avg PSA Approximation
	Avg PSA Since Cut-off Approximation							~~1725~~1722.2778%
CPR by Groups					Total CPR
PSA by Groups					Total PSA
				Page 14 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report for December 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
CPR Avg since Cut-Off by Groups					Total CPR Avg since Cut-Off
PSA Avg since Cut-Off by Groups					Total PSA Avg since Cut-Off
PREPAYMENT CALCULATION METHODOLOGY
Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases)/(Beg Principal Balance - Sched Principal)
Conditional Prepayment Rate (CPR): 1-((1-SMM)^12)
PSA Standard Prepayment Model: CPR/(0.02*min(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)
Average CPR over period between the nth month and mth month (AvgCPRn,m): 1-((1-AvgSMMn,m)^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)
Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments and repurchases.
Dates correspond to distribution dates.
				Page 15 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Prepayment Detail Report for September 27, 2004 Distribution
	Prepayment Detail Report for December 27, 2004 Distribution
	Prepayment Detail Report - Loans Prepaid in Full During Current Distribution
SUMMARY						LOAN GROUP
Total Loan Count = 40						Loan Group 1 = Group 1
Total Loan Count = 9						Loan Group 1 = Group 1
Total Original Principal Balance = 19,620,133.70
Total Original Principal Balance = 4,225,600.00
Total Prepayment Amount = 19,321,151.70
Total Prepayment Amount = 4,140,554.17
Loan Number			Original			Current	State &	Type Prepayment
&		Loan	Principal	Prepayment	Prepayment	Note	LTV at	&	Origination
Loan Group		Status	Balance	Amount	Date	Rate	Origination	Original Term	Date
1435700 1			356,000.00	347,067.01	Sep-07-04	6.875%	NY - 80.00%	Paid Off - 360	Feb-20-02
1501051 1			460,000.00	447,404.65	Dec-07-04	6.625%	WA - 73.60%	Paid Off - 360	Mar-26-02
1689587 1			995,000.00	972,648.49	Aug-23-04	6.375%	OK - 64.61%	Paid Off - 360	Aug-02-02
1625231 1			590,000.00	574,676.24	Nov-17-04	7.000%	NJ - 73.75%	Paid Off - 360	Aug-10-01
2275361 1			470,000.00	463,347.83	Sep-01-04	6.625%	CA - 65.73%	Paid Off - 360	Mar-11-03
1753603 1			860,000.00	840,125.32	Nov-24-04	6.500%	IL - 68.80%	Paid Off - 360	Sep-23-02
2948221 1			97,733.70	95,295.77	Aug-24-04	6.250%	OR - 79.85%	Paid Off - 360	Jul-08-03
1931051 1			384,000.00	371,227.14	Nov-23-04	6.875%	CA - 80.00%	Paid Off - 360	Oct-17-02
3076954 1			125,600.00	124,781.20	Sep-02-04	7.750%	FL - 80.00%	Paid Off - 360	Oct-01-03
3038141 1			440,000.00	436,020.09	Nov-18-04	6.625%	NY - 46.32%	Paid Off - 360	Dec-19-03
3156322 1			400,000.00	397,327.26	Aug-26-04	7.625%	ME - 80.00%	Paid Off - 360	Oct-15-03
3153607 1			317,600.00	311,545.20	Dec-01-04	6.375%	NJ - 80.00%	Paid Off - 360	Jun-12-03
3156957 1			472,500.00	469,673.08	Aug-23-04	6.875%	MN - 90.00%	Paid Off - 360	Dec-01-03
3156794 1			432,000.00	428,451.52	Nov-17-04	7.125%	NY - 90.00%	Paid Off - 360	Dec-18-03
3173806 1			260,000.00	257,623.39	Aug-24-04	6.000%	NY - 86.67%	Paid Off - 360	Oct-06-03
3259652 1			382,000.00	375,127.88	Nov-18-04	6.375%	CA - 68.83%	Paid Off - 360	Dec-11-03
3179691 1			600,000.00	596,977.64	Aug-30-04	7.750%	NY - 80.00%	Paid Off - 360	Dec-09-03
3276488 1			360,000.00	355,976.13	Dec-08-04	6.500%	CA - 74.69%	Paid Off - 360	Oct-16-03
3227242 1			1,560,000.00	1,550,035.42	Sep-14-04	7.250%	IL - 65.00%	Paid Off - 360	Dec-12-02
3299499 1			452,000.00	449,161.78	Aug-27-04	6.625%	CA - 80.00%	Paid Off - 360	Dec-22-03
3322797 1			1,150,000.00	999,824.21	Aug-24-04	6.625%	NY - 60.53%	Paid Off - 360	Mar-03-03
3403346 1			360,000.00	358,647.35	Aug-27-04	7.500%	CA - 94.74%	Paid Off - 360	Jan-29-04
3415271 1			474,800.00	471,760.56	Sep-01-04	6.125%	CA - 79.99%	Paid Off - 360	Jan-23-04
2156618 1			105,000.00	100,936.83	Sep-01-04	7.125%	NY - 72.41%	Repur/Subs - 180	Jul-31-03
2657301 1			423,000.00	419,859.27	Sep-01-04	6.625%	DC - 59.92%	Repur/Subs - 360	Nov-17-03
2703833 1			165,000.00	163,441.43	Sep-01-04	7.375%	AZ - 80.00%	Repur/Subs - 360	Jul-15-03
2812876 1			730,000.00	724,427.36	Sep-01-04	7.500%	NC - 45.63%	Repur/Subs - 360	Sep-29-03
3072963 1			350,000.00	347,905.99	Sep-01-04	6.875%	CA - 70.71%	Repur/Subs - 360	Dec-12-03
3136790 1			436,000.00	433,391.46	Sep-01-04	6.875%	IL - 80.00%	Repur/Subs - 360	May-19-03
3156353 1			544,000.00	540,532.35	Sep-01-04	7.250%	NY - 80.00%	Repur/Subs - 360	Nov-12-03
3156645 1			450,000.00	445,720.21	Sep-01-04	6.875%	CO - 64.94%	Repur/Subs - 360	Aug-25-03
3156711 1			315,000.00	311,402.98	Sep-01-04	7.250%	CA - 75.00%	Repur/Subs - 360	Oct-07-03
3156904 1			436,000.00	433,454.08	Sep-01-04	7.000%	CA - 48.07%	Repur/Subs - 360	Oct-22-03
3156944 1			580,000.00	576,529.90	Sep-01-04	6.875%	MA - 80.00%	Repur/Subs - 360	Nov-19-03
3156952 1			535,000.00	531,720.70	Sep-01-04	6.750%	GA - 62.57%	Repur/Subs - 360	Nov-24-03
3192896 1			370,000.00	368,349.67	Sep-01-04	6.625%	NY - 62.18%	Repur/Subs - 360	Feb-05-04
3209154 1			427,000.00	422,109.06	Sep-01-04	6.625%	CA - 70.00%	Repur/Subs - 360	Oct-09-03
3209218 1			420,000.00	417,506.70	Sep-01-04	7.000%	NY - 80.00%	Repur/Subs - 360	Dec-19-03
3226080 1			550,000.00	547,118.51	Sep-01-04	6.750%	NJ - 51.52%	Repur/Subs - 360	Jan-28-04
3252866 1			440,000.00	437,425.56	Sep-01-04	7.000%	CO - 80.00%	Repur/Subs - 360	Dec-05-03
3274829 1			356,000.00	354,308.33	Sep-01-04	7.250%	NJ - 80.00%	Repur/Subs - 360	Jan-15-04
3280378 1			1,000,000.00	994,632.73	Sep-01-04	6.625%	CA - 56.47%	Repur/Subs - 360	Jan-05-04
3300896 1			500,000.00	497,481.29	Sep-01-04	7.750%	FL - 88.50%	Repur/Subs - 360	Dec-22-03
3304517 1			397,500.00	395,467.40	Sep-01-04	6.875%	CA - 75.00%	Repur/Subs - 360	Jan-13-04
3311292 1			520,000.00	517,275.68	Sep-01-04	6.750%	CA - 64.20%	Repur/Subs - 360	Jan-02-04
3322456 1			384,000.00	382,263.18	Sep-01-04	7.500%	NJ - 80.00%	Repur/Subs - 360	Jan-15-04
3332110 1			405,000.00	402,517.56	Sep-01-04	6.750%	NY - 75.00%	Repur/Subs - 360	Dec-02-03
3342733 1			348,000.00	345,307.66	Sep-01-04	6.875%	CA - 80.00%	Repur/Subs - 360	Oct-24-03
3437979 1			660,000.00	655,894.82	Sep-01-04	7.375%	MA - 80.00%	Repur/Subs - 360	Nov-18-03
					Page 16 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report for December 27, 2004 Distribution
	Realized Loss Report - Collateral
COLLATERAL REALIZED LOSSES								TOTAL
	Current
	Number of Loans Liquidated							-
	Collateral Realized Loss/(Gain) Amount							-
	Net Liquidation Proceeds							-
	Cumulative
	Number of Loans Liquidated							-
	Collateral Realized Loss/(Gain) Amount							-
	Net Liquidation Proceeds							-
	Note: Collateral Realized Loss Amount may include adjustments to loans liquidated in prior periods.
	Current Realized Losses							0.00
	Supplemental Losses (Recoveries)							0.00
	Current Net Realized Losses (Recoveries)							0.00
	Prior Cumulative Realized Loss							0.00
	Current Net Realized Loss (Recoveries)							0.00
	Current Cumulative Realized Loss							0.00
	Current Special Hazard Loss Coverage Amount							3,~~617~~606,~~984~~727.5834
	Current Fraud Loss Coverage Amount							2,500,000.00
	Current Bankruptcy Loss Coverage Amount							100,000.00
	Class B-1 Write Down Amount							0.00
	Class B-2 Write Down Amount							0.00
	Class B-3 Write Down Amount							0.00
	Class B-4 Write Down Amount							0.00
	Class B-5 Write Down Amount							0.00
	Class B-6 Write Down Amount							0.00
							3 Months Moving Average
Collateral Loss Severity Approximation by Groups					Collateral Loss Severity Approximation
				Page 17 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
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	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report for December 27, 2004 Distribution
	Realized Loss Report - Collateral
DEFAULT SPEEDS								TOTAL
	MDR							0.00%
	3 Months Avg MDR							0.00%
	12 Months Avg MDR
	Avg MDR Since Cut-off							0.00%
	CDR							0.00%
	3 Months Avg CDR							0.00%
	12 Months Avg CDR
	Avg CDR Since Cut-off							0.00%
	SDA							0.00%
	3 Months Avg SDA Approximation							0.00%
	12 Months Avg SDA Approximation
	Avg SDA Since Cut-off Approximation							0.00%
	Loss Severity Approximation for Current Period
	3 Months Avg Loss Severity Approximation
	12 Months Avg Loss Severity Approximation
	Avg Loss Severity Approximation Since Cut-off
CDR by Groups					Total CDR
SDA by Groups					Total SDA
				Page 18 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Realized Loss Report for September 27, 2004 Distribution
	Realized Loss Report for December 27, 2004 Distribution
	Realized Loss Report - Collateral
CDR Avg since Cut-Off by Groups					Total CDR Avg since Cut-Off
SDA Avg since Cut-Off by Groups					Total SDA Avg since Cut-Off
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 19 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Realized Loss Detail Report for September 27, 2004 Distribution
	Realized Loss Detail Report for December 27, 2004 Distribution
	Realized Loss Detail Report - Loans Liquidated During Current Distribution
SUMMARY							LOAN GROUP
Total Loan Count Current Losses = 0
Total Loan Count Revisions = 0						Loan Group 1 = Group 1
Total Prior Principal Balance = 0.00
Total Current Realized Loss Amount = 0.00
Total Revisions Amount = 0.00
Total Realized Loss Amount = 0.00
Total Net Liquidation Proceeds = 0.00
Note: Total Realized Loss Amount may include adjustments to loans liquidated in prior periods.
Loan Number			Current	State &		Prior	Realized		Cumulative
&		Loan	Note	LTV at	Original	Principal	Loss/(Gain)	Realized	Realized
Loan Group		Status	Rate	Origination	Term	Balance	Revisions	Loss/(Gain)	Loss/(Gain)
SPACE INTENTIONALLY LEFT BLANK
					Page 20 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Triggers, Adj. Rate Cert. and Miscellaneous Report for September 27, 2004 Distribution
	Triggers, Adj. Rate Cert. and Miscellaneous Report for December 27, 2004 Distribution
	Triggers, Adj. Rate Cert. and Miscellaneous Report
TRIGGER EVENTS								TOTAL
	Has the Optional Termination Date been reached?							No
	Have the Sr. Prepay Step Down Cond been satisfied?							No
	Has the Sr. Credit Supp. Depletion Date been reached?							No
	Has the Spec. Haz. Coverage Term Date been reached?							No
	Has the Fraud LossCoverage Term. Date been reached?							No
	Has the Bank LossCoverage Term. Date been reached?							No
ADJUSTABLE RATE CERTIFICATE INFORMATION								TOTAL
SPACE INTENTIONALLY LEFT BLANK
ADDITIONAL INFORMATION								TOTAL
	Current Senior Percentage							9493.~~736365~~657435%
	Next Senior Percentage							9493.~~530524~~494263%
	Current Subordinate Percentage							56.~~263635~~342565%
	Next Subordinate Percentage							56.~~469476~~505737%
	Current Senior Prepayment Percentage							100.000000%
	Next Projected Senior Prepayment Percentage							100.000000%
	Current Subordinated Prepayment Percentage							0.000000%
	Next Projected Subordinated Prepayment Percentage							0.000000%
	Next Projected Pass-Through Rate for Class A-X							0.~~500482~~459858%
	Next Projected Pass-Through Rate for all other classes							5.250000%
				Page 21 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Other Related Information for September 27, 2004 Distribution
	Other Related Information for December 27, 2004 Distribution
	Other Related Information
ADDITIONAL INFORMATION								TOTAL
	Scheduled Principal
	1 Month Prior							~~195~~169,~~788~~258.8717
	2 Months Prior							~~212~~172,~~783~~403.8768
	3 Months Prior							~~213~~178,~~925~~012.0171
	4 Months Prior							~~218~~195,~~621~~788.8287
	5 Months Prior							~~222~~212,~~414~~783.7687
	6 Months Prior							~~227~~213,~~417~~925.9701
	7 Months Prior							~~237~~218,~~083~~621.5682
	8 Months Prior							0222,414.0076
	9 Months Prior							0227,417.0097
	10 Months Prior							0237,083.0056
	11 Months Prior							0.00
	12 Months Prior							0.00
	Scheduled Principal on 60+ Day Delinquent Loans
	1 Month Prior							0.00
	2 Months Prior							0.00
	3 Months Prior							0.00
	4 Months Prior							0.00
	5 Months Prior							0.00
	6 Months Prior							0.00
	7 Months Prior							0.00
	8 Months Prior							0.00
	9 Months Prior							0.00
	10 Months Prior							0.00
	11 Months Prior							0.00
	12 Months Prior							0.00
				Page 22 of 23				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-A1
	Mortgage Pass-Through Certificates
	Additional Certificate Report for September 27, 2004 Distribution
	Additional Certificate Report for December 27, 2004 Distribution
	Additional Certificate Report
	CLASS				Net PPIS & Relief Act Shortfall Allocation	Unpaid Interest Amount Due	Unpaid Interest Paid	Remaining Unpaid Interest Amount
	A-1				0.00	~~618,767~~0.9400	0.00	0.00
	A-2				0.00	~~55,394~~0.4600	0.00	0.00
	A-3				0.00	~~154,135~~0.4200	0.00	0.00
	A-4				0.00	~~19,166~~0.6700	0.00	0.00
	A-5				0.00	~~114,583~~0.3300	0.00	0.00
	A-6				0.00	~~5,208~~0.3300		0.00
	PO				0.00	0.00	0.00	0.00
	A-X				0.00	~~79,483~~0.0400	0.00	0.00
	A-R				0.00	0.00	0.00	0.00
	B-1				0.00	~~26,871~~0.7000	0.00	0.00
	B-2				0.00	~~8,957~~0.2300	0.00	0.00
	B-3				0.00	~~5,369~~0.5800	0.00	0.00
	B-4				0.00	~~4,183~~0.2200	0.00	0.00
	B-5				0.00	~~2,982~~0.5700	0.00	0.00
	B-6				0.00	~~5,377~~0.2900	0.00	0.00
	P				0.00	0.00	0.00	0.00
				Page 23 of 23				© COPYRIGHT 2004 Deutsche Bank

Filing Compare · RESIDENTIAL ASSET SECURITIZATION TRUST 2004-A1