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 IndyMac MBS, Inc. Residential Asset- Securitization Trust Series 2004-IndyPort1 Mortgage Pass-Through Certificates Series 2004-1. (Exact name of registrant as specified in charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-102888-15 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: ~~Oct~~Dec 0127, 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-IndyPort1
	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				6
			4.	Credit Enhancement Report				9
			5.	Collateral Report				10
			6.	Delinquency Report				13
			7.	REO Report				14
			8.	Prepayment Report				15
			9.	Prepayment Detail Report				18
			10.	Realized Loss Report				19
			11.	Realized Loss Detail Report				22
			12.	Triggers, Adj. Rate Cert. and Miscellaneous Report				23
			13.	Other Related Information				24
			14.	Additional Certificate Report				25
				Total Number of Pages				25
			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: February 1, 2004
	Certificate Insurer(s):							Closing Date: February 24, 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):		UBS Investment Bank Underwriter					Record Date: ~~August~~November 3130, 2004
			Deutsche Bank Securities Underwriter
						Page 1 of 25					© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	Mortgage Pass-Through Certificates
	Master REMIC
	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	CSTR	484,225,000.00			~~336~~290,~~277~~384,~~992~~715.1267	1957,~~118,431~~410.5913	1911,~~023~~967,~~941~~740.3914	2012,~~142~~925,~~372~~150.9827	-	-	~~317~~278,~~254~~416,~~050~~975.7353
A-1X	IO, NTL, DR	-			-	~~328~~283,~~430~~608.6635	-	~~328~~283,~~430~~608.6635	-	-	-
A-R	R, CSTR	100.00			-	-	-	-	-	-	-
B-1	SUB, CSTR	22,468,000.00			22,~~312~~059,~~279~~010.5174	8281,~~821~~244.8178	~~198~~27,~~697~~710.6631	~~281~~108,~~519~~955.4709	-	-	22,~~113~~031,~~581~~300.8543
B-1X	IO, NTL, DR	-			-	13,~~178~~028.5192	-	13,~~178~~028.5192	-	-	-
B-2	SUB, CSTR	2,582,000.00			2,~~564~~534,~~104~~999.7737	1110,~~032~~833.2684	223,~~834~~184.1444	3314,~~866~~018.4028	-	-	2,~~541~~531,~~270~~814.6393
B-3	SUB, CSTR	3,099,000.00			3,~~077~~042,~~521~~588.5532	13,~~241~~003.2812	273,~~406~~822.2707	4016,~~647~~825.5519	-	-	3,~~050~~038,~~115~~766.2825
B-4	SUB, CSTR	1,808,000.00			1,~~795~~775,~~469~~088.1763	7,~~725~~586.1520	152,~~989~~229.2085	239,~~714~~816.3505	-	-	1,~~779~~772,~~479~~858.9778
B-5	SUB, CSTR	1,292,000.00			1,~~283~~268,~~045~~481.4448	5,~~520~~421.4012	111,~~425~~593.9145	167,~~946~~014.3157	-	-	1,~~271~~266,~~619~~888.5303
B-6	SUB, CSTR	1,033,072.00			1,~~025~~014,~~912~~266.0380	4,~~414~~334.0768	91,~~136~~274.0511	135,~~550~~608.1279	-	-	1,~~016~~012,~~775~~992.9869
P	EXE	100.00			100.00	3528,~~982~~576.3792	-	3528,~~982~~576.3792	-	-	100.00
Total		516,507,272.00			~~368~~322,~~336~~079,~~424~~251.5901	1,~~620~~405,~~778~~048.1006	1912,~~309~~007,~~430~~554.6237	2013,~~930~~412,~~208~~602.7243	-	-	~~349~~310,~~026~~071,~~993~~696.9764
	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				A-30/360	45660NYL3	484,225,000.00	~~694~~599.~~466399~~689639	21.~~309735~~977201	3924.~~287400~~715246	4126.~~597136~~692447	~~655~~574.~~178999~~974393
A-1X				F-30/360	45660NYM1	484,225,000.00	~~694~~599.~~466399~~689639	0.~~678260~~585695	-	0.~~678260~~585695	~~655~~574.~~178999~~974393
A-R				A-30/360	45660NYN9	100.00	-	-	-	-	-
B-1				A-30/360	45660NYP4	22,468,000.00	~~993~~981.~~069232~~796811	3.~~686212~~616022	81.~~843585~~233323	124.~~529797~~849345	~~984~~980.~~225648~~563487
B-1X				F-30/360	45660NYQ2	22,468,000.00	~~993~~981.~~069232~~796811	0.~~586546~~579888	-	0.~~586546~~579888	~~984~~980.~~225648~~563487
B-2				A-30/360	45660NYR0	2,582,000.00	~~993~~981.~~069237~~796813	4.~~272758~~195910	81.~~843586~~233323	135.~~116344~~429233	~~984~~980.~~225651~~563490
B-3				A-30/360	45660NYS8	3,099,000.00	~~993~~981.~~069232~~796812	4.~~272759~~195908	81.~~843585~~233324	135.~~116344~~429232	~~984~~980.~~225647~~563488
B-4				A-30/360	45660NYT6	1,808,000.00	~~993~~981.~~069231~~796809	4.~~272760~~195907	81.~~843584~~233324	135.~~116344~~429231	~~984~~980.~~225647~~563485
B-5				A-30/360	45660NYU3	1,292,000.00	~~993~~981.~~069226~~796811	4.~~272755~~195913	81.~~843584~~233320	135.~~116339~~429234	~~984~~980.~~225642~~563491
B-6				A-30/360	45660NYV1	1,033,072.00	~~993~~981.~~069244~~796817	4.~~272761~~195913	81.~~843575~~233322	135.~~116337~~429234	~~984~~980.~~225669~~563496
P				A-30/360	IN04P10P1	100.00	1,000.000000	~~359~~285,~~823~~769.~~684000~~184000	-	~~359~~285,~~823~~769.~~684000~~184000	1,000.000000
							Page 2 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	Mortgage Pass-Through Certificates
	Master REMIC
	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	484,225,000.00		912,~~503~~516,~~462~~924.4054		~~163~~201,~~423~~015,~~934~~508.5331	34,~~547~~792,~~014~~516.7416	~~166~~205,~~970~~808,~~949~~024.2747	~~176~~218,~~474~~324,~~411~~949.6701	-	-	~~317~~278,~~254~~416,~~050~~975.7353
A-1X	-		23,~~772~~662,~~373~~237.8459		-	-	-	23,~~772~~662,~~373~~237.8459	-	-	-
A-R	100.00		0.43		97.34	2.66	100.00	100.43	-	-	-
B-1	22,468,000.00		~~584~~829,~~970~~677.1247		~~346~~425,~~340~~976.0568	810,~~078~~722.1089	~~354~~436,~~418~~699.1557	~~939~~1,~~388~~266,377.2704	-	-	22,~~113~~031,~~581~~300.8543
B-1X	-		92131,~~575~~711.9917		-	-	-	92131,~~575~~711.9917	-	-	-
B-2	2,582,000.00		77110,~~862~~481.9181		3948,~~801~~952.0581	~~928~~1,232.3226	4050,~~729~~185.3707	~~118~~160,~~592~~666.2888	-	-	2,~~541~~531,~~270~~814.6393
B-3	3,099,000.00		93132,~~453~~603.6085		4758,~~770~~754.5175	1,~~114~~479.2100	4860,~~884~~233.7275	~~142~~192,~~338~~837.3260	-	-	3,~~050~~038,~~115~~766.2825
B-4	1,808,000.00		5477,~~522~~362.1494		2734,~~869~~278.9835	~~650~~862.0587	2835,~~520~~141.0322	83112,~~042~~504.1716	-	-	1,~~779~~772,~~479~~858.9778
B-5	1,292,000.00		3855,~~961~~283.6270		1924,~~915~~495.9435	~~464~~616.5362	2025,~~380~~111.4797	5980,~~342~~395.0967	-	-	1,~~271~~266,~~619~~888.5303
B-6	1,033,072.00		3144,~~153~~204.37		1519,~~924~~586.5927	~~371~~493.4304	1620,~~296~~079.0231	4764,~~449~~283.3968	-	-	1,~~016~~012,~~775~~992.9869
P	100.00		~~288~~398,~~563~~861.5297		-	-	-	~~288~~398,~~563~~861.5297	-	-	100.00
Total	516,507,272.00		1317,~~537~~959,~~899~~349.9484		~~163~~201,~~921~~627,~~653~~649.9986	34,~~558~~807,~~624~~925.0450	~~167~~206,~~480~~435,~~278~~575.0336	~~181~~224,~~018~~394,~~177~~925.9720	-	-	~~349~~310,~~026~~071,~~993~~696.9764
	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	3.~~99110~~95645%	~~336~~290,~~277~~384,~~992~~715.1267			1957,~~118,431~~410.5913	-	-	-	1957,~~118,431~~410.5913	1957,~~118,431~~410.5913	-
A-1X	1.17200%	~~336~~290,~~277~~384,~~992~~715.1267			~~328~~283,~~430~~608.6635	-	-	-	~~328~~283,~~430~~608.6635	~~328~~283,~~430~~608.6635	-
A-R	5.~~16309~~12845%	-			-	-	-	-	-	-	-
B-1	4.~~45433~~41968%	22,~~312~~059,~~279~~010.5174			8281,~~821~~244.8178	-	-	-	8281,~~821~~244.8178	8281,~~821~~244.8178	-
B-1X	0.70877%	22,~~312~~059,~~279~~010.5174			13,~~178~~028.5192	-	-	-	13,~~178~~028.5192	13,~~178~~028.5192	-
B-2	5.~~16309~~12845%	2,~~564~~534,~~104~~999.7737			1110,~~032~~833.2684	-	-	-	1110,~~032~~833.2684	1110,~~032~~833.2684	-
B-3	5.~~16309~~12845%	3,~~077~~042,~~521~~588.5532			13,~~241~~003.2812	-	-	-	13,~~241~~003.2812	13,~~241~~003.2812	-
B-4	5.~~16309~~12845%	1,~~795~~775,~~469~~088.1763			7,~~725~~586.1520	-	-	-	7,~~725~~586.1520	7,~~725~~586.1520	-
B-5	5.~~16309~~12845%	1,~~283~~268,~~045~~481.4448			5,~~520~~421.4012	-	-	-	5,~~520~~421.4012	5,~~520~~421.4012	-
B-6	5.~~16309~~12845%	1,~~025~~014,~~912~~266.0380			4,~~414~~334.0768	-	-	-	4,~~414~~334.0768	4,~~414~~334.0768	-
P		100.00			1,~~584~~376,~~795~~471.7314	-	-	-	1,~~584~~376,~~795~~471.7314	3528,~~982~~576.3792	-
Total		~~726~~634,~~926~~522,~~696~~977.2242			32,~~169~~752,~~591~~942.4628	-	-	-	32,~~169~~752,~~591~~942.4628	1,~~620~~405,~~778~~048.1006	-
							Page 3 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	Mortgage Pass-Through Certificates
	Subsidiary REMIC
	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)
SUB-REMIC	REMIC	516,507,072.00			~~368~~322,~~336~~079,~~324~~151.5901	1,~~620~~405,~~778~~048.1006	1912,~~309~~007,~~430~~554.6237	2013,~~930~~412,~~208~~602.7243	-	-	~~349~~310,~~026~~071,~~893~~596.9764
Total		516,507,072.00			~~368~~322,~~336~~079,~~324~~151.5901	1,~~620~~405,~~778~~048.1006	1912,~~309~~007,~~430~~554.6237	2013,~~930~~412,~~208~~602.7243	-	-	~~349~~310,~~026~~071,~~893~~596.9764
	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)
SUB-REMIC				A-30/360		516,507,072.00	~~713~~623.~~129296~~571619	32.~~137959~~720288	3723.~~384639~~247609	4025.~~522599~~967897	~~675~~600.~~744657~~324010
							Page 4 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	Mortgage Pass-Through Certificates
	Subsidiary REMIC
	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)
SUB-REMIC	516,507,072.00		1317,~~537~~959,~~899~~349.9484		~~163~~201,~~921~~627,~~653~~649.9986	34,~~558~~807,~~524~~825.0450	~~167~~206,~~480~~435,~~178~~475.0336	~~181~~224,~~018~~394,~~077~~825.9720	-	-	~~349~~310,~~026~~071,~~893~~596.9764
Total	516,507,072.00		1317,~~537~~959,~~899~~349.9484		~~163~~201,~~921~~627,~~653~~649.9986	34,~~558~~807,~~524~~825.0450	~~167~~206,~~480~~435,~~178~~475.0336	~~181~~224,~~018~~394,~~077~~825.9720	-	-	~~349~~310,~~026~~071,~~893~~596.9764
	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)
SUB-REMIC	5.~~16309~~12845%	~~368~~322,~~336~~079,~~324~~151.5901			32,~~169~~752,~~591~~942.4628	-	-	-	32,~~169~~752,~~591~~942.4628	1,~~620~~405,~~778~~048.1006	-
Total		~~368~~322,~~336~~079,~~324~~151.5901			32,~~169~~752,~~591~~942.4628	-	-	-	32,~~169~~752,~~591~~942.4628	1,~~620~~405,~~778~~048.1006	-
							Page 5 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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							1912,~~309~~007,~~430~~554.6238
	Principal Withdrawals							0.00
	Principal Other Accounts							0.00
	TOTAL PRINCIPAL							1912,~~309~~007,~~430~~554.6238
	Interest Collections							1,~~584~~376,~~795~~471.7312
	Interest Withdrawals							0.00
	Interest Other Accounts							3528,~~982~~576.3793
	Interest Loan Adjustments							0.00
	Intrest Fees							0.00
	TOTAL INTEREST							1,~~620~~405,~~778~~048.1005
	TOTAL AVAILABLE FUNDS TO BONDHOLDERS							2013,~~930~~412,~~208~~602.7243
	Interest Payable to Bondholders							1,~~620~~405,~~778~~048.1005
	Principal Payment Amount Payable to Bondholders							1912,~~309~~007,~~430~~554.6238
PRINCIPAL - COLLECTIONS								TOTAL
	Scheduled Principal							~~442~~404,~~567~~592.3467
	Curtailments							~~142~~133,~~221~~983.5799
	Prepayments in Full							1511,~~887~~468,~~061~~977.7172
	Repurchases/Substitutions							~~2,837,580~~0.00
	Liquidations							0.00
	Insurance Principal							0.00
	Other Additional Principal							0.00
	LESS: Delinquent Principal							(~~362~~346,~~087~~083.5304)
	LESS: Realized Losses							0.00
	PLUS: Recoveries							0.00
	PLUS: Substitution Shortfall Principal							0.00
	PLUS: Principal Loan Adjustments							0.00
	PLUS: Principal Advanced							~~362~~346,~~087~~083.5304
	TOTAL PRINCIPAL							1912,~~309~~007,~~430~~554.6238
				Page 6 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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
	Cash Release							0.00
	TOTAL PRINCIPAL OTHER ACCOUNTS							0.00
INTEREST - COLLECTIONS								TOTAL
	Scheduled Interest							1,~~647~~445,~~496~~181.6034
	Repurchases/Substitutions							~~15,877~~0.5400
	Liquidations							0.00
	Insurance Interest							0.00
	Other Additional Interest							0.00
	LESS: Prepayment Interest Shortfalls							(97,~~265~~086.3220)
	LESS: Interest Fees							(1813,~~796~~078.7541)
	LESS: Delinquent Interest							(1,~~297~~200,~~725~~485.4542)
	LESS: Interest Realized Losses							0.00
	PLUS: Compensating Interest							97,~~265~~086.3220
	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							1,~~237~~144,~~943~~853.7961
	TOTAL INTEREST							1,~~584~~376,~~795~~471.7312
				Page 7 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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							3528,~~982~~576.3793
	TOTAL INTEREST OTHER ACCOUNTS							3528,~~982~~576.3793
INTEREST - FEES								TOTAL
	Current Servicing Fees							1611,~~955~~468.0701
	Trustee Fees							1,~~841~~610.6840
				Page 8 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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 9 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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							1054
	Prior							~~765~~677
	Prefunding							-
	Scheduled Paid Offs							-
	Full Voluntary Prepayments							(3124)
	Repurchases							~~(6)~~-
	Liquidations							-
	Current							~~728~~653
	Principal Balance:
	Original							516,507,171.71
	Prior							~~368~~322,~~336~~079,~~324~~150.3072
	Prefunding							-
	Scheduled Principal							(~~442~~404,~~567~~592.3467)
	Partial and Full Voluntary Prepayments							(1611,~~029~~602,~~283~~961.2871)
	Repurchases							~~(2,837,580.00)~~-
	Liquidations							-
	Current							~~349~~310,~~026~~071,~~893~~596.6834
PREFUNDING								TOTAL
SPACE INTENTIONALLY LEFT BLANK
Current Prin Balance by Groups (in millions of dollars)					Total Current Principal Balance (in millions of dollars)
				Page 10 of 25				© COPYRIGHT 2004 Deutsche Bank
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	Collateral Report for December 27, 2004 Distribution
	Collateral Report
CHARACTERISTICS								TOTAL
	Weighted Average Coupon Original							5.464863%
	Weighted Average Coupon Prior							5.~~422684~~400857%
	Weighted Average Coupon Current							5.~~419093~~384445%
	Weighted Average Months to Maturity Original							349
	Weighted Average Months to Maturity Prior							~~344~~342
	Weighted Average Months to Maturity Current							~~343~~341
	Weighted Avg Remaining Amortization Term Original							349
	Weighted Avg Remaining Amortization Term Prior							-341
	Weighted Avg Remaining Amortization Term Current							-340
	Weighted Average Seasoning Original							11.44
	Weighted Average Seasoning Prior							-18.95
	Weighted Average Seasoning Current							-19.88
Note: Original information refers to deal issue.
WAC by Groups					Total WAC
WARAT by Groups					Total WARAT
Note: Dates correspond to distribution dates.
				Page 11 of 25				© COPYRIGHT 2004 Deutsche Bank
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	Collateral Report for September 27, 2004 Distribution
	Collateral Report for December 27, 2004 Distribution
	Collateral Report
ARM CHARACTERISTICS								TOTAL
	Weighted Average Margin Original							2.758%
	Weighted Average Margin Prior							02.~~000~~759%
	Weighted Average Margin Current							02.~~000~~759%
	Weighted Average Max Rate Original							11.638%
	Weighted Average Max Rate Prior							011.~~000~~554%
	Weighted Average Max Rate Current							011.~~000~~536%
	Weighted Average Min Rate Original							2.761%
	Weighted Average Min Rate Prior							02.~~000~~764%
	Weighted Average Min Rate Current							02.~~000~~759%
	Weighted Average Cap Up Original							2.000%
	Weighted Average Cap Up Prior							02.000%
	Weighted Average Cap Up Current							02.000%
	Weighted Average Cap Down Original							2.000%
	Weighted Average Cap Down Prior							02.000%
	Weighted Average Cap Down Current							02.000%
Note: Original information refers to deal issue.
SERVICING FEES / ADVANCES								TOTAL
	Current Servicing Fees							1611,~~955~~468.0701
	Delinquent Servicing Fees							5955,~~781~~631.6682
	TOTAL SERVICING FEES							7667,~~736~~099.7383
	Total Servicing Fees							7667,~~736~~099.7383
	Compensating Interest							(97,~~265~~086.3220)
	Delinquent Servicing Fees							(5955,~~781~~631.6682)
	COLLECTED SERVICING FEES							74,~~689~~381.7581
	Total Advanced Principal For Current Payment Date							~~362~~346,~~087~~083.5304
	Total Advanced Interest For Current Payment Date							1,~~237~~144,~~943~~853.7961
	TOTAL ADVANCES FOR CURRENT PERIOD							1,~~600~~490,~~031~~936.3265
ADDITIONAL COLLATERAL INFORMATION								TOTAL
	Prepayment Interest Shortfall (PPIS)							97,~~265~~086.3220
	Compensating Interest							(97,~~265~~086.3220)
	Net Prepayment Interest Shortfall (Net PPIS)							0.00
	Weighted Average Net Mortgage Rate							5.~~163093~~128445%
				Page 12 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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		###########	43,~~216~~317,~~381~~343.7318	~~893~~928,~~217~~637.7116	-2,050,974.09	56,~~109~~296,~~599~~954.4443
		% Balance		8083.4497%	1.2107%	0.2630%	0.0066%	12.4603%
		# Loans		~~593~~542	8	2	-4	1014
		% # Loans		8183.4600%	1.1023%	0.2731%	0.0061%	12.3714%
FORECLOSURE		Balance		-	-	-	-	-
		% Balance		0.00%	0.00%	0.00%	0.00%	0.00%
		# Loans		-	-	-	-	-
		% # Loans		0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY		Balance		~~572,877.58~~-	-	-	-	~~572,877.58~~-
		% Balance		0.1600%	0.00%	0.00%	0.00%	0.1600%
		# Loans		1-	-	-	-	1-
		% # Loans		0.1400%	0.00%	0.00%	0.00%	0.1400%
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		~~572,877.58~~-	43,~~216~~317,~~381~~343.7318	~~893~~928,~~217~~637.7116	-2,050,974.09	56,~~682~~296,~~477~~954.0243
		% Balance		0.1600%	1.2107%	0.2630%	0.0066%	12.6303%
		# Loans		1-	8	2	-4	1114
		% # Loans		0.1400%	1.1023%	0.2731%	0.0061%	12.5114%
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 13 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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 14 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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							3124
	Number of Repurchased Loans							6-
	Total Number of Loans Prepaid in Full							3724
	Paid in Full Balance							1511,~~887~~468,~~061~~977.7172
	Repurchased Loans Balance							~~2,837,580.00~~-
	Curtailments Amount							~~142~~133,~~221~~983.5799
	Total Prepayment Amount							1811,~~866~~602,~~863~~961.2871
	Cumulative
	Number of Paid in Full Loans							~~320~~395
	Number of Repurchased Loans							6
	Total Number of Loans Prepaid in Full							~~326~~401
	Paid in Full Balance							~~159~~197,~~905~~229,~~465~~488.0233
	Repurchased Loans Balance							2,837,580.00
	Curtailments Amount							1,~~178~~496,~~608~~277.9858
	Total Prepayment Amount							~~163~~201,~~921~~563,~~654~~345.0091
SPACE INTENTIONALLY LEFT BLANK
Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)
				Page 15 of 25				© COPYRIGHT 2004 Deutsche Bank
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	Prepayment Report for September 27, 2004 Distribution
	Prepayment Report for December 27, 2004 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENT RATES								TOTAL
	SMM							53.1361%
	3 Months Avg SMM							43.8075%
	12 Months Avg SMM
	Avg SMM Since Cut-off							54.3486%
	CPR							4635.8365%
	3 Months Avg CPR							4436.6178%
	12 Months Avg CPR
	Avg CPR Since Cut-off							4845.2100%
	PSA							~~780~~896.5644%
	3 Months Avg PSA Approximation							~~743~~970.5382%
	12 Months Avg PSA Approximation
	Avg PSA Since Cut-off Approximation							~~1193~~1437.47%
CPR by Groups					Total CPR
PSA by Groups					Total PSA
				Page 16 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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 17 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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 = 37						Loan Group 1 = Group 1
Total Loan Count = 24						Loan Group 1 = Group 1
Total Original Principal Balance = 19,111,942.00
Total Original Principal Balance = 11,805,150.00
Total Prepayment Amount = 18,724,641.71
Total Prepayment Amount = 11,468,977.72
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
1250781 1			600,000.00	580,106.78	Sep-02-04	7.500%	DC - 71.43%	Paid Off - 360	Aug-30-01
1777279 1			375,000.00	364,426.50	Dec-03-04	5.875%	CA - 50.68%	Paid Off - 360	Aug-08-02
1826756 1			372,000.00	362,768.69	Aug-18-04	5.250%	CA - 80.00%	Paid Off - 360	Aug-16-02
1800889 1			460,000.00	448,378.32	Dec-02-04	6.250%	CA - 69.70%	Paid Off - 360	Sep-17-02
1835422 1			543,750.00	523,643.77	Aug-31-04	5.250%	CA - 75.00%	Paid Off - 360	Aug-23-02
1848978 1			870,000.00	845,184.13	Dec-08-04	5.125%	FL - 48.33%	Paid Off - 360	Oct-09-02
1911657 1			360,000.00	351,723.06	Aug-30-04	5.375%	CA - 72.00%	Paid Off - 360	Oct-25-02
1880234 1			600,000.00	586,215.68	Nov-23-04	6.000%	HI - 80.00%	Paid Off - 360	Nov-06-02
1921126 1			372,000.00	363,920.24	Aug-18-04	5.500%	CA - 80.00%	Paid Off - 360	Nov-06-02
1882066 1			434,400.00	423,010.44	Nov-18-04	5.625%	NY - 80.00%	Paid Off - 360	Nov-07-02
1936197 1			363,000.00	354,835.51	Aug-31-04	5.875%	VA - 79.96%	Paid Off - 360	Oct-11-02
1896038 1			544,000.00	527,566.98	Nov-16-04	5.250%	CA - 80.00%	Paid Off - 360	Sep-06-02
1957336 1			635,000.00	621,231.86	Aug-23-04	5.625%	MO - 79.28%	Paid Off - 360	Oct-28-02
1906245 1			505,000.00	436,394.29	Dec-08-04	5.000%	CA - 54.89%	Paid Off - 360	Oct-05-02
1962053 1			363,000.00	354,947.87	Aug-30-04	5.500%	CA - 76.42%	Paid Off - 360	Oct-28-02
1928229 1			492,000.00	477,125.36	Dec-01-04	5.250%	CA - 80.00%	Paid Off - 360	Sep-17-02
1991825 1			483,000.00	471,886.84	Sep-03-04	5.750%	CA - 79.83%	Paid Off - 360	Oct-29-02
1941353 1			408,000.00	393,600.69	Nov-18-04	5.625%	CA - 80.00%	Paid Off - 360	Oct-21-02
2016675 1			510,000.00	492,013.81	Sep-01-04	5.750%	CA - 69.86%	Paid Off - 360	Dec-16-02
1971625 1			378,000.00	368,088.13	Dec-01-04	5.875%	CA - 70.00%	Paid Off - 360	Oct-26-02
2028048 1			600,000.00	585,379.80	Aug-18-04	5.125%	FL - 70.59%	Paid Off - 360	Oct-29-02
2055065 1			504,000.00	490,973.12	Nov-30-04	5.375%	CA - 67.20%	Paid Off - 360	Dec-04-02
2042164 1			368,800.00	360,325.37	Aug-17-04	5.250%	CA - 80.00%	Paid Off - 360	Dec-03-02
2107952 1			617,000.00	602,803.89	Dec-07-04	5.750%	CA - 76.17%	Paid Off - 360	Dec-31-01
2078030 1			524,000.00	513,108.87	Sep-01-04	5.500%	FL - 80.00%	Paid Off - 360	Jan-31-03
2125183 1			455,000.00	445,924.74	Nov-16-04	6.250%	CA - 78.58%	Paid Off - 360	Feb-14-03
2095498 1			457,700.00	450,129.88	Sep-07-04	6.000%	GA - 62.93%	Paid Off - 360	Mar-03-03
2169714 1			428,000.00	418,152.40	Nov-24-04	5.750%	NY - 80.00%	Paid Off - 360	Jan-30-03
2131882 1			476,000.00	467,165.74	Aug-19-04	5.875%	CA - 80.00%	Paid Off - 360	Feb-07-03
2257570 1			388,000.00	379,202.69	Nov-22-04	5.250%	GA - 80.00%	Paid Off - 360	Mar-14-03
2159409 1			350,000.00	343,236.59	Aug-19-04	5.125%	CT - 46.98%	Paid Off - 360	Feb-05-03
2266876 1			538,000.00	527,224.23	Nov-30-04	5.625%	MA - 74.93%	Paid Off - 360	Apr-08-03
2238268 1			616,000.00	604,894.80	Sep-15-04	5.875%	CA - 80.00%	Paid Off - 360	Feb-10-03
2303902 1			600,000.00	586,701.78	Dec-07-04	5.500%	CA - 48.19%	Paid Off - 360	Mar-07-03
2271470 1			496,000.00	487,058.07	Aug-24-04	5.875%	CA - 80.00%	Paid Off - 360	Feb-21-03
2343757 1			703,750.00	687,288.77	Dec-07-04	5.375%	FL - 78.19%	Paid Off - 360	Jan-23-02
2290835 1			416,000.00	408,958.91	Sep-01-04	5.875%	MD - 80.00%	Paid Off - 360	Mar-17-03
2422866 1			408,000.00	401,046.18	Nov-19-04	6.500%	NJ - 80.00%	Paid Off - 360	Apr-25-03
2298454 1			700,000.00	680,441.25	Sep-09-04	5.250%	NY - 56.00%	Paid Off - 360	Mar-07-03
2722252 1			475,000.00	466,184.75	Dec-03-04	5.000%	CA - 63.33%	Paid Off - 360	Jul-24-03
2310134 1			352,500.00	344,543.74	Sep-01-04	5.500%	CA - 75.00%	Paid Off - 360	Feb-26-03
2728725 1			340,000.00	333,836.52	Nov-18-04	5.500%	CA - 80.00%	Paid Off - 360	Jun-23-03
2311682 1			1,500,000.00	1,469,017.11	Aug-26-04	5.125%	CA - 68.18%	Paid Off - 360	Feb-05-03
2788292 1			540,000.00	527,022.44	Dec-03-04	5.625%	CA - 80.00%	Paid Off - 360	Jul-17-03
2316708 1			449,500.00	441,208.53	Aug-24-04	5.750%	CA - 79.23%	Paid Off - 360	Feb-19-03
2811675 1			357,000.00	352,300.25	Dec-01-04	5.625%	CA - 71.40%	Paid Off - 360	Dec-04-02
2336978 1			566,250.00	556,081.65	Aug-19-04	5.375%	CA - 75.00%	Paid Off - 360	Mar-11-03
2939496 1			385,000.00	380,325.44	Dec-02-04	6.500%	CA - 70.00%	Paid Off - 360	Sep-09-03
2405408 1			560,000.00	551,136.02	Sep-01-04	5.875%	DC - 80.00%	Paid Off - 360	Apr-17-03
2445329 1			440,000.00	432,539.51	Sep-01-04	5.500%	CA - 80.00%	Paid Off - 360	Apr-10-03
2512296 1			840,000.00	826,545.99	Sep-01-04	5.000%	CA - 70.00%	Paid Off - 360	Feb-11-02
2594520 1			649,990.00	640,262.80	Sep-07-04	5.375%	NV - 79.36%	Paid Off - 360	Jun-24-03
2693912 1			360,000.00	350,423.96	Aug-19-04	4.625%	CA - 80.00%	Paid Off - 360	Jul-14-03
2716465 1			560,000.00	553,282.06	Aug-26-04	6.125%	CA - 80.00%	Paid Off - 360	Jul-18-03
2863920 1			348,000.00	344,242.63	Sep-01-04	5.250%	FL - 80.00%	Paid Off - 360	Oct-09-03
1847940 1			720,000.00	705,525.45	Aug-31-04	6.750%	SC - 80.00%	Repur/Subs - 360	Sep-11-02
1855043 1			410,000.00	401,969.31	Aug-31-04	6.625%	NY - 63.57%	Repur/Subs - 360	Oct-07-02
1956713 1			411,000.00	402,949.53	Aug-31-04	6.625%	NJ - 60.89%	Repur/Subs - 360	Nov-01-02
2724709 1			380,000.00	376,298.18	Aug-31-04	6.750%	CA - 80.00%	Repur/Subs - 360	Aug-25-03
2921301 1			488,000.00	483,690.44	Aug-31-04	6.750%	CA - 80.00%	Repur/Subs - 360	Sep-02-03
2966361 1			470,452.00	467,147.09	Aug-31-04	6.750%	CO - 79.66%	Repur/Subs - 360	Nov-17-03
					Page 18 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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							5,~~868~~848,~~091~~093.3494
	Current Fraud Loss Coverage Amount							15,495,215.15
	Current Bankruptcy Loss Coverage Amount							150,000.00
	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 19 of 25				© COPYRIGHT 2004 Deutsche Bank
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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 20 of 25				© COPYRIGHT 2004 Deutsche Bank
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	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 21 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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 22 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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 Bankruptcy Coverage Termination Date occurred?							No
	Have the Fraud Loss Coverage Termination Date occurred?							No
	Has the Senior Step Down Conditions occurred?							No
	Has the Special Hazard Coverage Termination Date occurred?							No
	Has the Two Times Test occurred?							No
ADJUSTABLE RATE CERTIFICATE INFORMATION								TOTAL
SPACE INTENTIONALLY LEFT BLANK
ADDITIONAL INFORMATION								TOTAL
	Current Senior Percentage							9190.~~296451~~159427%
	Next Senior Percentage							9089.~~896735~~791190%
	Current Subordinate Percentage							89.~~703549~~840573%
	Next Subordinate Percentage							910.~~103265~~208810%
	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-1							3.~~982081~~954233%
	Next Projected Pass-Through Rate for Class A-1X							1.171997%
	Next Projected Pass-Through Rate for Class B-1							4.~~445311~~417463%
	Next Projected Pass-Through Rate for Class B-1X							0.708767%
				Page 23 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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
	Next Projected Pass-Through Rate for all other classes							5.~~154078~~126230%
	Scheduled Principal
	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
	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 24 of 25				© COPYRIGHT 2004 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2004-IndyPort1
	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	0.00	0.00	0.00
	A-1X				0.00	0.00	0.00	0.00
	A-R				0.00	0.00	0.00	0.00
	B-1				0.00	0.00	0.00	0.00
	B-1X				0.00	0.00	0.00	0.00
	B-2				0.00	0.00	0.00	0.00
	B-3				0.00	0.00	0.00	0.00
	B-4				0.00	0.00	0.00	0.00
	B-5				0.00	0.00	0.00	0.00
	B-6				0.00	0.00	0.00	0.00
	P				0.00	0.00	0.00	0.00
				Page 25 of 25				© COPYRIGHT 2004 Deutsche Bank

Filing Compare · RESIDENTIAL ASSET SECURITIZATION TRUST SERIES 2004-INDYPORT1