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): ~~November~~December 2526, 2003 INDYMAC MBS, INC. as Depositor, IndyMac Bank, F.S.B. as Seller and as Master Servicer, and Deutsche Bank National Trust Company, as trustee under the Pooling and Servicing Agreement, dated as of June 1, 2003, providing for the issuance of IndyMac MBS, Inc. Residential Asset-Securitization Trust Series 2003-A8 Mortgage Pass-Through Certificates Series 2003-H. INDYMAC INC RESIDENTIAL ASSET SEC TRUST 2003-A8 (Exact name of Registrant as specified in its Charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-102888-06 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 Item 5. 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 7. Financial Statement and Exhibits Exhibits: (as noted in Item 5 above) Monthly Remittance Statement to the Certificateholders dated as of ~~November~~December 2526, 2003. SIGNATURE 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, not in it individual capacity, but solely as a duly authorized agent of the Registrant pursuant to the Pooling and Servicing Agreement, dated as of June 1, 2003. Date: ~~Nov~~Jan 2602, ~~2003~~2004 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT Monthly Remittance Statement to the Certificateholders dated as of ~~November~~December 2526, 2003.

	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	November 25, 2003 Distribution
	December 26, 2003 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: James Noriega
				Direct Phone Number: (714)247-6281
				Address: Deutsche Bank
				1761 E. St. Andrew Place, Santa Ana, CA 92705
				Web Site: https://www.corporatetrust.db.com/invr
				Factor Information: (800) 735-7777
				Main Phone Number: (714) 247-6000
ISSUANCE INFORMATION
	Seller:		IndyMac Bank					Cut-Off Date: June 1, 2003
	Certificate Insurer(s):							Closing Date: June 16, 2003
								First Payment Date: July 25, 2003
	Servicer(s):		IndyMac Bank Master Servicer
								Distribution Date: November 25, 2003
								Distribution Date: December 26, 2003
	Underwriter(s):		Greenwich Capital Markets					Record Date: ~~October~~November 3128, 2003
						Page 1 of 23					© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Series 2003-A8
	Certificate Payment Report for November 25, 2003 Distribution
	Certificate Payment Report for December 26, 2003 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	NAS	163,542,461.00			~~137~~135,~~589~~502,~~630~~113.0540	~~429~~423,~~967~~444.5910	2932,~~087,516~~742.6548	21,~~517~~356,~~484~~186.2458	-	-	~~135~~134,~~502~~569,~~113~~370.4092
A-2	SEQ,AS	172,685,539.00			~~145~~143,~~281~~077,~~777~~555.4920	~~177~~175,~~970~~120.1897	2984,~~204,222~~888.2980	21,~~382~~160,~~192~~009.4777	-	-	~~143~~142,~~077~~092,~~555~~666.2040
A-3	SEQ,AS	-			-	~~669~~659,~~506~~498.8611	-	~~669~~659,~~506~~498.8611	-	-	-
A-4	SEQ,AS	100,000,000.00			8482,~~130~~854,~~830~~393.1505	~~185~~182,~~788~~970.9212	1570,~~276,437~~336.1058	1753,~~462,226~~306.0270	-	-	82,~~854~~284,~~393~~056.0547
A-5	FLT,AS	30,000,000.00			2524,~~239~~856,~~249~~317.0592	8988,~~389~~032.0179	~~382~~171,~~931~~100.1397	~~472~~259,~~320~~133.1476	-	-	24,~~856~~685,~~317~~216.9295
PO	PO,RSTP	1,646,421.00			1,~~637~~630,~~055~~237.9129	-	6,~~818~~770.6250	6,~~818~~770.6250	-	-	1,~~630~~623,~~237~~466.2979
A-X	IO,NTL	-			-	~~148~~144,~~831~~618.2685	-	~~148~~144,~~831~~618.2685	-	-	-
A-R	R,AS	100.00			-	-	-	-	-	-	-
B-1	SUB,NAS	4,275,000.00			4,~~177~~150,~~888~~417.5530	16,~~537~~428.4874	2715,~~471~~929.2510	4432,~~008~~357.7384	-	-	4,~~150~~134,~~417~~488.3020
B-2	SUB,NAS	712,500.00			~~696~~691,~~314~~736.7622	2,~~756~~738.2512	42,~~578~~654.5485	75,~~334~~392.7997	-	-	~~691~~689,~~736~~081.2237
B-3	SUB,NAS	950,000.00			~~928~~922,~~419~~314.6895	3,~~674~~650.9983	63,~~104~~539.7280	97,~~779~~190.7163	-	-	~~922~~918,~~314~~775.9516
B-4	SUB,NAS	475,000.00			~~464~~461,~~209~~157.8448	1,~~837~~825.5042	31,~~052~~769.3690	43,~~889~~595.8632	-	-	~~461~~459,~~157~~387.4858
B-5	SUB,NAS	237,500.00			~~232~~230,~~104~~578.9274	~~918~~912.7571	~~1,526~~884.1895	21,~~444~~797.9366	-	-	~~230~~229,~~578~~693.7479
B-6	SUB,NAS	475,478.94			~~464~~461,~~677~~622.9652	1,~~839~~827.3526	31,~~055~~771.4468	43,~~894~~598.7994	-	-	~~461~~459,~~622~~850.5284
P	SUB	100.00			100.00	-	-	-	-	-	100.00
Total		475,000,099.94			~~400~~394,~~842~~838,~~258~~544.3607	1,~~729~~701,~~018~~068.1402	62,~~003~~692,~~714~~389.2961	74,~~732~~393,~~732~~457.4363	-	-	~~394~~392,~~838~~146,~~544~~154.0746
Class PO and Class AX payments adjusted to correct an overcollateralization of the Class PO Cert
	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	45660NRL1	163,542,461.00	~~841~~828.~~308301~~543930	2.~~629088~~589200	125.~~764371~~703366	158.~~393459~~292566	~~828~~822.~~543930~~840564
A-2				F-30/360	45660NRM9	172,685,539.00	~~841~~828.~~308301~~543930	1.~~030603~~014103	125.~~764371~~703366	136.~~794974~~717469	~~828~~822.~~543930~~840565
A-3				F-30/360	45660NRN7	172,685,539.00	~~841~~828.~~308301~~543930	3.~~877029~~819070	-	3.~~877029~~819070	~~828~~822.~~543930~~840565
A-4	1011/25/03	1112/24/03		F-30/360	45660NRP2	100,000,000.00	~~841~~828.~~308302~~543931	1.~~857889~~829701	125.~~764371~~703366	147.~~622260~~533067	~~828~~822.~~543931~~840565
A-5	1011/25/03	1112/24/03		A-30/360	45660NRQ0	30,000,000.00	~~841~~828.~~308302~~543931	2.~~979634~~934426	125.~~764371~~703366	158.~~744005~~637792	~~828~~822.~~543931~~840565
PO				F-30/360	45660NRR8	1,646,421.00	~~994~~990.~~311850~~170370	-	4.~~141480~~112253	4.~~141480~~112253	~~990~~986.~~170370~~058116
A-X				A-30/360	45660NRS6	415,829,174.00	~~824~~811.~~956108~~118611	0.~~357914~~347784	-	0.~~357914~~347784	~~811~~805.~~118611~~221394
A-R				-	45660NRT4	100.00	-	-	-	-	-
B-1				F-30/360	45660NRV9	4,275,000.00	~~977~~970.~~283871~~857847	3.~~868416~~842980	63.~~426024~~726105	107.~~294440~~569085	~~970~~967.~~857847~~131743
B-2				F-30/360	45660NRW7	712,500.00	~~977~~970.~~283871~~857847	3.~~868421~~842975	63.~~426024~~726105	107.~~294445~~569080	~~970~~967.~~857847~~131743
B-3				F-30/360	45660NRU1	950,000.00	~~977~~970.~~283871~~857847	3.~~868411~~842979	63.~~426024~~726105	107.~~294435~~569083	~~970~~967.~~857847~~131743
B-4				F-30/360	45660NRH0	475,000.00	~~977~~970.~~283871~~857847	3.~~868421~~842989	63.~~426024~~726105	107.~~294445~~569094	~~970~~967.~~857847~~131743
B-5				F-30/360	45660NRJ6	237,500.00	~~977~~970.~~283871~~857847	3.~~868421~~842989	63.~~426024~~726104	107.~~294445~~569094	~~970~~967.~~857847~~131743
B-6				F-30/360	45660NRK3	475,478.94	~~977~~970.~~284005~~857980	3.~~868415~~842988	63.~~426025~~726105	107.~~294440~~569093	~~970~~967.~~857980~~131875
P				-		100.00	1,000.000000	-	-	-	1,000.000000
							Page 2 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Series 2003-A8
	Certificate Payment Report for November 25, 2003 Distribution
	Certificate Payment Report for December 26, 2003 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	163,542,461.00		2,~~340~~763,~~305~~749.5969		25,~~286~~692,~~183~~526.9346	23,~~754~~280,~~163~~563.6762	28,~~040~~973,~~347~~090.6008	3031,~~380~~736,~~653~~839.1977	-	-	~~135~~134,~~502~~569,~~113~~370.4092
A-2	172,685,539.00		~~993~~1,~~421~~168,542.4037		2627,~~699~~128,~~844~~904.6332	23,~~908~~463,~~139~~968.1728	2930,~~607~~592,~~983~~872.8060	3031,~~601~~761,~~405~~414.2097	-	-	~~143~~142,~~077~~092,~~555~~666.2040
A-3	-		34,~~619~~278,~~380~~878.2940		-	-	-	34,~~619~~278,~~380~~878.2940	-	-	-
A-4	100,000,000.00		1,~~011~~194,~~245~~215.6173		15,~~461~~710,~~540~~003.5355	12,~~684~~005,~~066~~939.4298	17,~~145~~715,~~606~~943.9553	18,~~156~~910,~~852~~159.5626	-	-	82,~~854~~284,~~393~~056.0547
A-5	30,000,000.00		~~486~~574,~~542~~575.7049		4,~~638~~713,~~462~~001.1606	~~505~~601,~~219~~781.9299	5,~~143~~314,~~682~~783.0805	5,~~630~~889,~~224~~358.7854	-	-	24,~~856~~685,~~317~~216.9295
PO	1,646,421.00		-		1316,~~694~~644.9547	26,~~488~~309.7674	1622,~~183~~954.7121	1622,~~183~~954.7121	-	-	1,~~630~~623,~~237~~466.2979
A-X	-		~~828~~973,~~870~~488.0691		-	-	-	~~828~~973,~~870~~488.0691	-	-	-
A-R	100.00		0.40		92.07	7.93	100.00	100.40	-	-	-
B-1	4,275,000.00		83100,~~790~~219.6741		~~108~~115,~~476~~415.1656	1625,~~106~~096.5424	~~124~~140,~~582~~511.7080	~~208~~240,~~373~~731.3721	-	-	4,~~150~~134,~~417~~488.3020
B-2	712,500.00		1316,~~965~~703.1123		1819,~~079~~235.3693	24,~~684~~182.4271	2023,~~763~~418.7863	3440,~~728~~121.8986	-	-	~~691~~689,~~736~~081.2237
B-3	950,000.00		1822,~~620~~270.1598		2425,~~105~~647.8190	35,~~579~~576.2394	2731,~~685~~224.0584	4653,~~305~~495.2082	-	-	~~922~~918,~~314~~775.9516
B-4	475,000.00		911,~~310~~135.0850		12,~~052~~823.9195	12,~~789~~788.6247	1315,~~842~~612.5242	2326,~~152~~747.6092	-	-	~~461~~459,~~157~~387.4858
B-5	237,500.00		45,~~655~~567.0374		6,~~026~~411.4598	~~894~~1,394.8124	67,~~921~~806.2621	1113,~~576~~373.2995	-	-	~~230~~229,~~578~~693.7479
B-6	475,478.94		911,~~319~~146.4571		12,~~065~~836.0082	12,791.4128	1315,~~856~~628.4210	2326,~~175~~774.8781	-	-	~~461~~459,~~622~~850.5284
P	100.00		-		-	-	-	-	-	-	100.00
Total	475,000,099.94		911,~~419~~120,~~426~~494.5456		7273,~~280~~453,~~623~~544.9606	79,~~880~~400,~~931~~401.9142	8082,~~161~~853,~~555~~945.8748	8993,~~580~~974,~~982~~440.4104	-	-	~~394~~392,~~838~~146,~~544~~154.0746
	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	3.75000%	~~137~~135,~~589~~502,~~630~~113.0540			~~429~~423,~~967~~444.5910	-	-	-	~~429~~423,~~967~~444.5910	~~429~~423,~~967~~444.5910	-
A-2	1.~~47000~~46875%	~~145~~143,~~281~~077,~~777~~555.4920			~~177~~175,~~970~~120.1897	-	-	-	~~177~~175,~~970~~120.1897	~~177~~175,~~970~~120.1897	-
A-3	5.~~53000~~53125%	~~145~~143,~~281~~077,~~777~~555.4920			~~669~~659,~~506~~498.8611	-	-	-	~~669~~659,~~506~~498.8611	~~669~~659,~~506~~498.8611	-
A-4	2.65000%	8482,~~130~~854,~~830~~393.1505			~~185~~182,~~788~~970.9212	-	-	-	~~185~~182,~~788~~970.9212	~~185~~182,~~788~~970.9212	-
A-5	4.25000%	2524,~~239~~856,~~249~~317.0592			8988,~~389~~032.0179	-	-	-	8988,~~389~~032.0179	8988,~~389~~032.0179	-
PO		1,~~637~~630,~~055~~237.9129			-	-	-	-	-	-	-
A-X	0.~~52078~~51467%	~~343~~337,~~040~~286,~~816~~782.8214			~~148~~144,~~872~~660.9339	~~623~~665.7731	~~582~~623.1077	-	~~148~~144,~~831~~618.2685	~~148~~144,~~831~~618.2685	~~623~~665.7731
A-R	4.75000%	-			-	-	-	-	-	-	-
B-1	4.75000%	4,~~177~~150,~~888~~417.5530			16,~~537~~428.4874	-	-	-	16,~~537~~428.4874	16,~~537~~428.4874	-
B-2	4.75000%	~~696~~691,~~314~~736.7622			2,~~756~~738.2512	-	-	-	2,~~756~~738.2512	2,~~756~~738.2512	-
B-3	4.75000%	~~928~~922,~~419~~314.6895			3,~~674~~650.9983	-	-	-	3,~~674~~650.9983	3,~~674~~650.9983	-
B-4	4.75000%	~~464~~461,~~209~~157.8448			1,~~837~~825.5042	-	-	-	1,~~837~~825.5042	1,~~837~~825.5042	-
B-5	4.75000%	~~232~~230,~~104~~578.9274			~~918~~912.7571	-	-	-	~~918~~912.7571	~~918~~912.7571	-
B-6	4.75000%	~~464~~461,~~677~~622.9652			1,~~839~~827.3526	-	-	-	1,~~839~~827.3526	1,~~839~~827.3526	-
P		100.00			-	-	-	-	-	-	-
Total		~~889~~875,~~164~~202,~~852~~881.6741			1,~~729~~701,~~059~~109.8156	~~623~~665.7731	~~582~~623.1077	-	1,~~729~~701,~~018~~068.1402	1,~~729~~701,~~018~~068.1402	~~623~~665.7731
							Page 3 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collection Account Report for November 25, 2003 Distribution
	Collection Account Report for December 26, 2003 Distribution
	Collection Account Report
SUMMARY								TOTAL
	Principal Collections							62,~~003~~692,~~714~~389.3062
	Principal Withdrawals							0.00
	Principal Other Accounts							0.00
	TOTAL PRINCIPAL							62,~~003~~692,~~714~~389.3062
	Interest Collections							1,~~834~~805,~~625~~052.1763
	Interest Withdrawals							(~~105~~103,~~607~~984.0460)
	Interest Other Accounts							0.00
	TOTAL INTEREST							1,~~729~~701,~~018~~068.1303
	TOTAL AVAILABLE FUNDS TO BONDHOLDERS							74,~~732~~393,~~732~~457.4365
	Interest Payable to Bondholders							1,~~729~~701,~~018~~068.1303
	Principal Payment Amount Payable to Bondholders							62,~~003~~692,~~714~~389.3062
PRINCIPAL - COLLECTIONS								TOTAL
	Scheduled Principal							1,~~511~~515,~~764~~648.0953
	Curtailments							~~165~~174,~~774~~863.1855
	Prepayments in Full							31,~~206~~001,~~502~~877.4254
	Repurchases/Substitutions							~~1,119,673~~0.6100
	Liquidations							0.00
	Insurance Principal							0.00
	Other Additional Principal							0.00
	LESS: Delinquent Principal							(5,~~638~~666.1767)
	LESS: Realized Losses							0.00
	PLUS: Recoveries							0.00
	PLUS: Substitution Shortfall Principal							0.00
	PLUS: Principal Loan Adjustments							0.00
	PLUS: Principal Advanced							5,~~638~~666.1767
	TOTAL PRINCIPAL							62,~~003~~692,~~714~~389.3062
				Page 4 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collection Account Report for November 25, 2003 Distribution
	Collection Account Report for December 26, 2003 Distribution
	Collection Account Report
PRINCIPAL - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
PRINCIPAL - OTHER ACCOUNTS								TOTAL
	Prefunding Release							0.00
INTEREST - COLLECTIONS								TOTAL
	Scheduled Interest							1,~~828~~805,~~744~~468.6384
	Repurchases/Substitutions							~~6,298~~0.2600
	Liquidations							0.00
	Insurance Interest							0.00
	Other Additional Interest							0.00
	LESS: Prepayment Interest Shortfalls							0(4,060.0054)
	LESS: Delinquent Interest							(7,~~924~~895.3888)
	LESS: Interest Realized Losses							0.00
	PLUS: Compensating Interest							04,060.0054
	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							7,~~506~~479.6667
	TOTAL INTEREST							1,~~834~~805,~~625~~052.1763
				Page 5 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collection Account Report for November 25, 2003 Distribution
	Collection Account Report for December 26, 2003 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							~~103,~~101,516.7886
	Trustee Fees							2,~~505~~467.2674
	TOTAL INTEREST FEES							~~105~~103,~~607~~984.0460
				Page 6 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Credit Enhancement Report for November 25, 2003 Distribution
	Credit Enhancement Report for December 26, 2003 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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collateral Report for November 25, 2003 Distribution
	Collateral Report for December 26, 2003 Distribution
	Collateral Report
COLLATERAL								TOTAL
	Loan Count:
	Original							1050
	Prior							~~937~~928
	Prefunding							-
	Scheduled Paid Offs							-
	Full Voluntary Prepayments							(62)
	Repurchases							~~(3)~~-
	Liquidations							-
	Current							~~928~~926
	Principal Balance:
	Original							466,773,042.90
	Prior							~~400~~394,~~842~~838,~~158~~444.3606
	Prefunding							-
	Scheduled Principal							(1,~~511~~515,~~764~~648.0953)
	Partial and Full Voluntary Prepayments							(31,~~372~~176,~~276~~741.6009)
	Repurchases							~~(1,119,673.61)~~-
	Liquidations							-
	Current							~~394~~392,~~838~~146,~~444~~054.0644
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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collateral Report for November 25, 2003 Distribution
	Collateral Report for December 26, 2003 Distribution
	Collateral Report
CHARACTERISTICS								TOTAL
	Weighted Average Coupon Original							5.518635%
	Weighted Average Coupon Prior							5.~~500760~~493563%
	Weighted Average Coupon Current							5.~~493563~~487213%
	Weighted Average Months to Maturity Original							176
	Weighted Average Months to Maturity Prior							~~173~~172
	Weighted Average Months to Maturity Current							~~172~~171
	Weighted Avg Remaining Amortization Term Original							176
	Weighted Avg Remaining Amortization Term Prior							~~173~~172
	Weighted Avg Remaining Amortization Term Current							~~172~~171
	Weighted Average Seasoning Original							3.79
	Weighted Average Seasoning Prior							67.3223
	Weighted Average Seasoning Current							78.2322
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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Collateral Report for November 25, 2003 Distribution
	Collateral Report for December 26, 2003 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							5.519%
	Weighted Average Max Rate Prior							5.~~393~~382%
	Weighted Average Max Rate Current							5.~~382~~374%
	Weighted Average Min Rate Original							5.519%
	Weighted Average Min Rate Prior							5.~~393~~382%
	Weighted Average Min Rate Current							5.~~382~~374%
	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							~~103,~~101,516.7886
	Delinquent Servicing Fees							~~417~~416.7221
	TOTAL SERVICING FEES							~~103~~101,~~519~~933.5007
	Total Servicing Fees							~~103~~101,~~519~~933.5007
	Compensating Interest							0(4,060.0054)
	Delinquent Servicing Fees							(~~417~~416.7221)
	COLLECTED SERVICING FEES							~~103~~97,~~101~~456.7832
	Total Advanced Principal For Current Payment Date							5,~~638~~666.1767
	Total Advanced Interest For Current Payment Date							7,~~506~~479.6667
	TOTAL ADVANCES FOR CURRENT PERIOD							13,~~144~~146.8334
ADDITIONAL COLLATERAL INFORMATION								TOTAL
	Prepayment Interest Shortfall (PPIS)							04,060.0054
	Compensating Interest							0(4,060.0054)
	Net Prepayment Interest Shortfall (Net PPIS)							0.00
	Weighted Average Net Mortgage Rate							5.~~176281~~170042%
				Page 10 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Delinquency Report for November 25, 2003 Distribution
	Delinquency Report for December 26, 2003 Distribution
	Delinquency Report - Total
				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		-	~~987,539.64~~-	~~573~~983,~~257~~992.3971	-571,137.65	1,~~560~~555,~~797~~130.0336
		% Balance			0.2500%	0.1525%	0.0015%	0.40%
		# Loans			3-	23	-2	5
		% # Loans			0.3200%	0.2232%	0.0022%	0.54%
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		-	-	-	-	-
		% 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		-	~~987,539.64~~-	~~573~~983,~~257~~992.3971	-571,137.65	1,~~560~~555,~~797~~130.0336
		% Balance		0.00%	0.2500%	0.1525%	0.0015%	0.40%
		# Loans		-	3-	23	-2	5
		% # Loans		0.00%	0.3200%	0.2232%	0.0022%	0.54%
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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	REO Report for November 25, 2003 Distribution
	REO Report for December 26, 2003 Distribution
	REO Report - Mortgage Loans that Become REO During Current Distribution
SUMMARY				LOAN GROUP
Total Loan Count = 0				Loan Group 1 = Group 1 Group; 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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Prepayment Report for November 25, 2003 Distribution
	Prepayment Report for December 26, 2003 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENTS								TOTAL
	Current
	Number of Paid in Full Loans							62
	Number of Repurchased Loans							3-
	Total Number of Loans Prepaid in Full							92
	Paid in Full Balance							31,~~206~~001,~~502~~877.4254
	Repurchased Loans Balance							~~1,119,673.61~~-
	Curtailments Amount							~~165~~174,~~774~~863.1855
	Total Prepayment Amount							41,~~491~~176,~~950~~741.2109
	Cumulative
	Number of Paid in Full Loans							~~128~~130
	Number of Repurchased Loans							10
	Total Number of Loans Prepaid in Full							~~138~~140
	Paid in Full Balance							6667,~~533~~535,~~700~~577.4498
	Repurchased Loans Balance							4,828,772.80
	Curtailments Amount							~~919~~1,~~808~~094,672.8136
	Total Prepayment Amount							7273,~~282~~459,~~282~~023.0514
SPACE INTENTIONALLY LEFT BLANK
Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)
				Page 13 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Prepayment Report for November 25, 2003 Distribution
	Prepayment Report for December 26, 2003 Distribution
	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENT RATES								TOTAL
	SMM							10.1230%
	3 Months Avg SMM							21.4082%
	12 Months Avg SMM
	Avg SMM Since Cut-off							32.2980%
	CPR							123.6953%
	3 Months Avg CPR							2519.2881%
	12 Months Avg CPR
	Avg CPR Since Cut-off							3328.0989%
	PSA							~~877~~214.7871%
	3 Months Avg PSA Approximation							~~1987~~1364.2460%
	12 Months Avg PSA Approximation
	Avg PSA Since Cut-off Approximation							~~3005~~2423.5992%
CPR by Groups					Total CPR
PSA by Groups					Total PSA
				Page 14 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Prepayment Report for November 25, 2003 Distribution
	Prepayment Report for December 26, 2003 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/(0.02*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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Prepayment Detail Report for November 25, 2003 Distribution
	Prepayment Detail Report for December 26, 2003 Distribution
	Prepayment Detail Report - Loans Prepaid in Full During Current Distribution
SUMMARY						LOAN GROUP
Total Loan Count = 9						Loan Group 1 = Group 1 Group
Total Loan Count = 2						Loan Group 1 = Group 1 Group
Total Original Principal Balance = 4,605,490.00
Total Original Principal Balance = 1,040,000.00
Total Prepayment Amount = 4,326,176.03
Total Prepayment Amount = 1,001,877.54
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
1176488 1			399,990.00	363,872.08	Oct-17-03	7.625%	NY - 74.07%	Paid Off - 180	Jul-25-01
2075542 1			560,000.00	533,727.65	Nov-09-03	6.125%	WA - 79.43%	Paid Off - 180	Oct-07-02
2050996 1			800,000.00	774,481.79	Oct-27-03	5.875%	CA - 34.04%	Paid Off - 180	Dec-12-02
2319644 1			480,000.00	468,149.89	Nov-01-03	5.875%	CA - 80.00%	Paid Off - 180	Mar-24-03
2297305 1			590,000.00	579,319.43	Oct-29-03	5.500%	CA - 42.14%	Paid Off - 180	Apr-03-03
2368158 1			450,000.00	441,937.70	Oct-17-03	5.625%	CA - 32.26%	Paid Off - 180	Apr-10-03
2384968 1			720,000.00	706,830.81	Nov-13-03	5.375%	CA - 43.64%	Paid Off - 180	May-05-03
2613556 1			345,000.00	340,060.61	Nov-03-03	5.750%	NY - 23.00%	Paid Off - 180	May-23-03
941288 1			378,000.00	330,120.14	Oct-31-03	6.625%	CA - 46.55%	Repur/Subs - 180	Mar-09-01
2117863 1			472,500.00	458,476.95	Oct-31-03	6.750%	NY - 90.00%	Repur/Subs - 180	Dec-06-02
2131299 1			450,000.00	331,076.52	Oct-31-03	6.875%	WA - 64.29%	Repur/Subs - 180	Jan-27-98
					Page 16 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Realized Loss Report for November 25, 2003 Distribution
	Realized Loss Report for December 26, 2003 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							2,985,500.00
	Current Fraud Loss Coverage Amount							4,289,089.00
	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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Realized Loss Report for November 25, 2003 Distribution
	Realized Loss Report for December 26, 2003 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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Realized Loss Report for November 25, 2003 Distribution
	Realized Loss Report for December 26, 2003 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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Realized Loss Detail Report for November 25, 2003 Distribution
	Realized Loss Detail Report for December 26, 2003 Distribution
	Realized Loss Detail Report - Loans Liquidated During Current Distribution
SUMMARY						LOAN GROUP
Total Loan Count = 0						Loan Group 1 = Group 1 Group
Total Original Principal Balance = 0.00
Total Prior Principal Balance = 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			Original	Prior		Current	State &
&		Loan	Principal	Principal	Realized	Note	LTV at	Original	Origination
Loan Group		Status	Balance	Balance	Loss/(Gain)	Rate	Origination	Term	Date
SPACE INTENTIONALLY LEFT BLANK
					Page 20 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Triggers, Adj. Rate Cert. and Miscellaneous Report for November 25, 2003 Distribution
	Triggers, Adj. Rate Cert. and Miscellaneous Report for December 26, 2003 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							98.~~255630~~240671%
	Next Senior Percentage							98.~~240671~~235370%
	Current Subordinate Percentage							1.~~744370~~759329%
	Next Subordinate Percentage							1.~~759329~~764630%
	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-4							2.650000%
	Next Projected Pass-Through Rate for Class A-5							1.~~470000~~468750%
	Next Projected Pass-Through Rate for Class A-6							5.~~530000~~531250%
	Next Projected Pass-Through Rate for Class A-X							0.~~514673~~513505%
	Next Projected Pass-Through Rate for all other classes							3.750000%
	Scheduled Principal
				Page 21 of 23				© COPYRIGHT 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Other Related Information for November 25, 2003 Distribution
	Other Related Information for December 26, 2003 Distribution
	Other Related Information
ADDITIONAL INFORMATION								TOTAL
	1 Month Prior							1,~~511~~515,~~764~~648.0953
	2 Months Prior							1,~~521~~511,~~062~~764.1509
	3 Months Prior							1,~~580~~521,~~618~~062.4815
	4 Months Prior							1,~~608~~580,~~237~~618.5648
	5 Months Prior							1,~~656~~608,~~760~~237.8756
	6 Months Prior							01,656,760.0087
	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							25,~~109~~666.0867
	2 Months Prior							~~354~~2,109.3208
	3 Months Prior							~~352~~354.2632
	4 Months Prior							0352.0026
	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 2003 Deutsche Bank
	IndyMac Residential Asset Securitization Trust 2003-A8
	Mortgage Pass-Through Certificates
	Additional Certificate Report for November 25, 2003 Distribution
	Additional Certificate Report for December 26, 2003 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-2				0.00	0.00	0.00	0.00
	A-3				0.00	0.00	0.00	0.00
	A-4				0.00	0.00	0.00	0.00
	A-5				0.00	0.00	0.00	0.00
	PO				0.00	0.00	0.00	0.00
	A-X				0.00	~~582~~623.1077	0.00	~~623~~665.7731
	A-R				0.00	0.00	0.00	0.00
	B-1				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
				Page 23 of 23				© COPYRIGHT 2003 Deutsche Bank

Filing Compare · INDYMAC MBS INC RESIDENTIAL ASSET SEC TRUST 2003-A8