SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant To Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): ~~August~~September 25, 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 March 1, 2003, providing for the issuance of IndyMac MBS, Inc. Residential Asset-Securitization Trust Series 2003-A4 Mortgage Pass-Through Certificates Series 2003-D. INDYMAC MBS INC RESIDENTIAL ASSET SECUR TRUST 2003-A4 (Exact name of Registrant as specified in its Charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-102888-03 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 ~~August~~September 25, 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 March 1, 2003. Date: ~~Aug~~Oct 2801, 2003 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT Monthly Remittance Statement to the Certificateholders dated as of ~~August~~September 25, 2003.

	IndyMac RAST 2003-A4
	IndyMac Residential Asset Securitization Trust 2003-A4
	Mortgage Pass-Through Certificates
	August 25, 2003 Distribution
	September 25, 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
				Total Number of Pages				21
			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: March 1, 2003
	Certificate Insurer(s):							Closing Date: March 27, 2003
								First Payment Date: April 25, 2003
	Servicer(s):		IndyMac Bank
								Distribution Date: August 25, 2003
								Distribution Date: September 25, 2003
	Underwriter(s):		Bear, Stearns & Co. Inc					Record Date: ~~July~~August 3129, 2003
						Page 1 of 21					© COPYRIGHT 2003 Deutsche Bank
	IndyMac RAST 2003-A4
	IndyMac Residential Asset Securitization Trust 2003-A4
	Mortgage Pass-Through Certificates
	Series 2003-A4
	Certificate Payment Report for August 25, 2003 Distribution
	Certificate Payment Report for September 25, 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	PAC,AS	121,359,118.00			~~114~~113,~~727~~000,~~759~~069.2421	~~406~~400,~~327~~208.4858	1,~~727~~704,~~690~~548.0223	2,~~134~~104,~~017~~756.5081	-	-	~~113~~111,~~000~~295,~~069~~520.2199
A-2	PAC,CPT,AS	55,000,000.00			5149,~~938~~910,~~730~~505.0731	~~248~~239,~~873~~154.0850	2,~~028~~736,~~224~~117.7609	2,~~277~~975,~~097~~271.8459	-	-	4947,~~910~~174,~~505~~388.3122
A-3	FLT,PAC,AS	66,195,882.00			6261,~~578~~636,~~777~~400.2588	7877,~~223~~559.4714	~~942~~929,~~376~~753.3757	1,~~020~~007,~~599~~312.8471	-	-	6160,~~636~~706,~~400~~647.8831
A-4	IO,INV,NTL	-			-	~~365~~359,~~042~~032.8704	-	~~365~~359,~~042~~032.8704	-	-	-
A-5	TAC,AS	45,298,500.00			4342,~~684~~800,~~956~~553.9994	~~218~~214,~~424~~002.7877	~~884~~1,~~403~~067,927.0598	1,~~102~~281,~~827~~930.8375	-	-	4241,~~800~~732,~~553~~625.9496
A-6	PO,TAC	1,969,500.00			1,~~899~~860,~~345~~893.9665	-	3846,~~452~~431.3165	3846,~~452~~431.3165	-	-	1,~~860~~814,~~893~~462.6500
A-7	FLT,DLY,SUP	23,513,906.00			1916,~~973~~129,~~545~~421.6712	3831,~~615~~317.5296	3538,~~844,124~~914.5526	3570,~~882,740~~232.0722	-	-	1615,~~129~~590,~~421~~506.1287
A-8	INV,DLY,SUP	9,201,094.00			76,~~815~~311,~~735~~512.5685	9476,~~541~~211.4552	1210,~~504,222~~879.7150	1287,~~598,764~~091.1602	-	-	6,~~311~~100,~~512~~633.8535
A-9	SEQ,AS	11,500,000.00			11,500,000.00	55,104.17	-	55,104.17	-	-	11,500,000.00
PO	PO,RSTP	210,914.00			~~194~~192,~~460~~014.7058	-	2,~~446~~535.1200	2,~~446~~535.1200	-	-	~~192~~189,~~014~~479.58
A-X	IO,CSTR,NTL	-			-	~~101~~97,~~063~~538.1021	-	~~101~~97,~~063~~538.1021	-	-	-
A-R	R,AS	100.00			-	~~0.01~~-	-	~~0.01~~-	-	-	-
B-1	SUB,NAS	8,400,000.00			8,~~356~~339,~~408~~533.5686	4039,~~041~~960.1227	1619,~~874~~592.6974	5659,~~915~~553.8101	-	-	8,~~339~~319,~~533~~941.8613
B-2	SUB,NAS	2,625,000.00			2,~~611~~606,~~377~~104.6733	12,~~512~~487.8558	56,~~273~~122.3473	1718,~~786~~610.1931	-	-	2,~~606~~599,~~104~~981.3360
B-3	SUB,NAS	1,925,000.00			1,~~915~~911,~~010~~143.2918	9,~~176~~157.0956	34,~~867~~490.1200	13,~~043~~647.2156	-	-	1,~~911~~906,~~143~~653.1817
B-4	SUB,NAS	1,050,000.00			1,~~044~~042,~~551~~441.0773	54,~~005~~995.1403	2,~~109~~449.3409	7,~~114~~444.4812	-	-	1,~~042~~039,~~441~~992.7364
B-5	SUB,NAS	525,000.00			~~522~~521,~~275~~220.5387	2,~~502~~497.5752	1,~~054~~224.6755	3,~~557~~722.2407	-	-	~~521~~519,~~220~~996.8732
B-6	SUB,NAS	1,225,985.52			1,~~219~~217,~~623~~160.3447	5,~~844~~832.0323	2,~~462~~859.8755	8,~~306~~691.9078	-	-	1,~~217~~214,~~160~~300.4791
P		100.00			100.00	-	-	-	-	-	100.00
Total		350,000,099.52			~~329~~318,~~982~~979,~~657~~075.9099	1,~~681~~625,~~297~~059.7308	117,~~003~~273,~~581~~845.9193	128,~~684~~898,~~879~~905.6401	-	-	~~318~~311,~~979~~705,~~075~~230.9906
	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	45660NPF6	121,359,118.00	~~945~~931.~~357556~~121378	3.~~348141~~297722	14.~~236178~~045490	17.~~584319~~343211	~~931~~917.~~121378~~075889
A-2				F-30/360	45660NPG4	55,000,000.00	~~944~~907.~~340547~~463733	4.~~524965~~348264	3649.~~876814~~747583	4154.~~401779~~095847	~~907~~857.~~463733~~716150
A-3				A-30/360	45660NPH2	66,195,882.00	~~945~~931.~~357556~~121378	1.~~181697~~171661	14.~~236178~~045490	15.~~417875~~217151	~~931~~917.~~121378~~075889
A-4				A-30/360	45660NPJ8	66,195,882.00	~~945~~931.~~357556~~121378	5.~~514586~~423782	-	5.~~514586~~423782	~~931~~917.~~121378~~075889
A-5				F-30/360	45660NPK5	45,298,500.00	~~964~~944.~~379770~~855877	4.~~821899~~724279	1923.~~523893~~575350	2428.~~345791~~299629	~~944~~921.~~855877~~280527
A-6				-30/360	45660NPL3	1,969,500.00	~~964~~944.~~379770~~855877	-	1923.~~523893~~575350	1923.~~523893~~575350	~~944~~921.~~855877~~280527
A-7				A-30/360	45660NPM1	23,513,906.00	~~849~~685.~~435465~~952437	1.~~642242~~331891	~~163~~22.~~483028~~918959	~~165~~24.~~125270~~250850	~~685~~663.~~952437~~033478
A-8				A-30/360	45660NPN9	9,201,094.00	~~849~~685.~~435465~~952437	108.~~275023~~282876	~~163~~22.~~483028~~918959	~~173~~31.~~758050~~201835	~~685~~663.~~952437~~033478
A-9				F-30/360	45660NPP4	11,500,000.00	1,000.000000	4.791667	-	4.791667	1,000.000000
PO				-30/360	45660NPQ2	210,914.00	~~921~~910.~~990480~~392767	-	1112.~~597713~~019117	1112.~~597713~~019117	~~910~~898.~~392767~~373650
A-X				A-30/360	45660NPR0	275,071,562.00	~~939~~905.~~498222~~812354	0.~~367407~~354592	-	0.~~367407~~354592	~~905~~885.~~812354~~943404
A-R				F-30/360	45660NPS8	100.00	-	~~0.100000~~-	-	~~0.100000~~-	-
B-1				F-30/360	45660NPT6	8,400,000.00	~~994~~992.~~810543~~801650	4.~~766800~~757175	2.~~008892~~332469	67.~~775692~~089644	~~992~~990.~~801650~~469182
B-2				F-30/360	45660NPU3	2,625,000.00	~~994~~992.~~810543~~801650	4.~~766800~~757173	2.~~008892~~332469	67.~~775692~~089642	~~992~~990.~~801650~~469182
B-3				F-30/360	45660NPV1	1,925,000.00	~~994~~992.~~810542~~801650	4.~~766800~~757174	2.~~008892~~332469	67.~~775692~~089643	~~992~~990.~~801650~~469182
B-4				F-30/360	45660NPW9	1,050,000.00	~~994~~992.~~810542~~801650	4.~~766800~~757171	2.~~008892~~332469	67.~~775692~~089640	~~992~~990.~~801650~~469182
B-5				F-30/360	45660NPX7	525,000.00	~~994~~992.~~810542~~801650	4.~~766800~~757181	2.~~008892~~332469	67.~~775692~~089650	~~992~~990.~~801650~~469182
B-6				F-30/360	45660NPY5	1,225,985.52	~~994~~992.~~810559~~801667	4.~~766802~~757177	2.~~008892~~332452	67.~~775694~~089629	~~992~~990.~~801667~~469214
P				-		100.00	1,000.000000	-	-	-	1,000.000000
							Page 2 of 21				© COPYRIGHT 2003 Deutsche Bank
	IndyMac RAST 2003-A4
	IndyMac Residential Asset Securitization Trust 2003-A4
	Mortgage Pass-Through Certificates
	Series 2003-A4
	Certificate Payment Report for August 25, 2003 Distribution
	Certificate Payment Report for September 25, 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	121,359,118.00		2,~~097~~498,~~916~~125.4705		-	810,~~359~~063,~~048~~597.7901	810,~~359~~063,~~048~~597.7901	1012,~~456~~561,~~965~~722.2606	-	-	~~113~~111,~~000~~295,~~069~~520.2199
A-2	55,000,000.00		1,~~292~~531,~~388~~542.3888		-	57,~~089~~825,~~494~~611.6978	57,~~089~~825,~~494~~611.6978	69,~~381~~357,~~883~~154.0766	-	-	4947,~~910~~174,~~505~~388.3122
A-3	66,195,882.00		~~437~~515,~~505~~064.2135		-	45,~~559~~489,~~481~~234.1269	45,~~559~~489,~~481~~234.1269	46,~~996~~004,~~986~~299.3304	-	-	6160,~~636~~706,~~400~~647.8831
A-4	-		12,~~851~~210,~~130~~162.9094		-	-	-	12,~~851~~210,~~130~~162.9094	-	-	-
A-5	45,298,500.00		1,~~122~~336,~~535~~538.8057		-	23,~~497~~565,~~946~~874.0604	23,~~497~~565,~~946~~874.0604	34,~~620~~902,~~481~~412.8661	-	-	4241,~~800~~732,~~553~~625.9496
A-6	1,969,500.00		-		-	~~108~~155,~~606~~038.3500	~~108~~155,~~606~~038.3500	~~108~~155,~~606~~038.3500	-	-	1,~~860~~814,~~893~~462.6500
A-7	23,513,906.00		~~232~~263,~~458~~776.2824		-	7,~~384~~923,~~484~~399.8813	7,~~384~~923,~~484~~399.8813	78,~~616~~187,~~943~~175.1637	-	-	1615,~~129~~590,~~421~~506.1287
A-8	9,201,094.00		~~527~~603,~~736~~947.2072		-	23,~~889~~100,~~581~~460.1565	23,~~889~~100,~~581~~460.1565	3,~~417~~704,~~317~~408.3537	-	-	6,~~311~~100,~~512~~633.8535
A-9	11,500,000.00		~~275~~330,~~520~~625.8502		-	-	-	~~275~~330,~~520~~625.8502	-	-	11,500,000.00
PO	210,914.00		-		-	1821,~~899~~434.42	1821,~~899~~434.42	1821,~~899~~434.42	-	-	~~192~~189,~~014~~479.58
A-X	-		~~532~~629,~~075~~613.7697		-	-	-	~~532~~629,~~075~~613.7697	-	-	-
A-R	100.00		47.49		-	100.00	100.00	147.49	-	-	-
B-1	8,400,000.00		~~200~~240,~~756~~717.7300		-	6080,~~466~~058.1487	6080,~~466~~058.1487	~~261~~320,~~222~~775.87	-	-	8,~~339~~319,~~533~~941.8613
B-2	2,625,000.00		6275,~~736~~224.4907		-	1825,~~895~~018.6740	1825,~~895~~018.6740	81100,~~632~~242.1647	-	-	2,~~606~~599,~~104~~981.3360
B-3	1,925,000.00		4655,~~006~~164.7531		-	1318,~~856~~346.8283	1318,~~856~~346.8283	5973,~~863~~511.5714	-	-	1,~~911~~906,~~143~~653.1817
B-4	1,050,000.00		2530,~~094~~089.5962		-	710,~~558~~007.2736	710,~~558~~007.2736	3240,~~652~~096.8698	-	-	1,~~042~~039,~~441~~992.7364
B-5	525,000.00		1215,~~547~~044.3082		-	35,~~779~~003.1368	35,~~779~~003.1368	1620,~~326~~048.4350	-	-	~~521~~519,~~220~~996.8732
B-6	1,225,985.52		2935,~~300~~132.5881		-	811,~~825~~684.0561	811,~~825~~684.0561	3846,~~125~~817.6342	-	-	1,~~217~~214,~~160~~300.4791
P	100.00		17,786.27		-	-	-	17,786.27	-	-	100.00
Total	350,000,099.52		810,~~763~~388,~~544~~603.0513		-	3138,~~021~~294,~~023~~869.5346	3138,~~021~~294,~~023~~869.5346	3948,~~784~~683,~~567~~472.5859	-	-	~~318~~311,~~979~~705,~~075~~230.9906
	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	4.25000%	~~114~~113,~~727~~000,~~759~~069.2421			~~406~~400,~~327~~208.4858	-	-	-	~~406~~400,~~327~~208.4858	~~406~~400,~~327~~208.4858	-
A-2	5.75000%	5149,~~938~~910,~~730~~505.0731			~~248~~239,~~873~~154.0850	-	-	-	~~248~~239,~~873~~154.0850	~~248~~239,~~873~~154.0850	-
A-3	1.~~50000~~51000%	6261,~~578~~636,~~777~~400.2588			7877,~~223~~559.4714	-	-	-	7877,~~223~~559.4714	7877,~~223~~559.4714	-
A-4	76.~~00000~~99000%	6261,~~578~~636,~~777~~400.2588			~~365~~359,~~042~~032.8704	-	-	-	~~365~~359,~~042~~032.8704	~~365~~359,~~042~~032.8704	-
A-5	6.00000%	4342,~~684~~800,~~956~~553.9994			~~218~~214,~~424~~002.7877	-	-	-	~~218~~214,~~424~~002.7877	~~218~~214,~~424~~002.7877	-
A-6		1,~~899~~860,~~345~~893.9665			-	-	-	-	-	-	-
A-7	2.~~32000~~33000%	1916,~~973~~129,~~545~~421.6712			3831,~~615~~317.5296	-	-	-	3831,~~615~~317.5296	3831,~~615~~317.5296	-
A-8	########	76,~~815~~311,~~735~~512.5685			9476,~~541~~211.4552	-	-	-	9476,~~541~~211.4552	9476,~~541~~211.4552	-
A-9	5.75000%	11,500,000.00			55,104.17	-	-	-	55,104.17	55,104.17	-
PO		~~194~~192,~~460~~014.7058			-	-	-	-	-	-	-
A-X	0.~~46928~~46976%	~~258~~249,~~429~~163,~~243~~219.2922			~~101~~97,~~063~~538.1021	-	-	-	~~101~~97,~~063~~538.1021	~~101~~97,~~063~~538.1021	-
A-R	5.75000%	-			-	-	-	-	-	~~0.01~~-	-
B-1	5.75000%	8,~~356~~339,~~408~~533.5686			4039,~~041~~960.1227	-	-	-	4039,~~041~~960.1227	4039,~~041~~960.1227	-
B-2	5.75000%	2,~~611~~606,~~377~~104.6733			12,~~512~~487.8558	-	-	-	12,~~512~~487.8558	12,~~512~~487.8558	-
B-3	5.75000%	1,~~915~~911,~~010~~143.2918			9,~~176~~157.0956	-	-	-	9,~~176~~157.0956	9,~~176~~157.0956	-
B-4	5.75000%	1,~~044~~042,~~551~~441.0773			54,~~005~~995.1403	-	-	-	54,~~005~~995.1403	54,~~005~~995.1403	-
B-5	5.75000%	~~522~~521,~~275~~220.5387			2,~~502~~497.5752	-	-	-	2,~~502~~497.5752	2,~~502~~497.5752	-
B-6	5.75000%	1,~~219~~217,~~623~~160.3447			5,~~844~~832.0323	-	-	-	5,~~844~~832.0323	5,~~844~~832.0323	-
P		100.00			-	-	-	-	-	-	-
Total		~~650~~629,~~990~~778,~~678~~696.4409			1,~~681~~625,~~297~~059.7208	-	-	-	1,~~681~~625,~~297~~059.7208	1,~~681~~625,~~297~~059.7308	-
							Page 3 of 21				© COPYRIGHT 2003 Deutsche Bank
	IndyMac RAST 2003-A4
	IndyMac Residential Asset Securitization Trust 2003-A4
	Mortgage Pass-Through Certificates
	Collection Account Report for August 25, 2003 Distribution
	Collection Account Report for September 25, 2003 Distribution
	Collection Account Report
SUMMARY								TOTAL
	Principal Collections							117,~~003~~273,~~581~~845.9195
	Principal Withdrawals							0.00
	Principal Other Accounts							0.00
	TOTAL PRINCIPAL							117,~~003~~273,~~581~~845.9195
	Interest Collections							1,~~767~~708,~~181~~041.5315
	Interest Withdrawals							(8582,~~883~~982.8009)
	Interest Other Accounts							0.00
	TOTAL INTEREST							1,~~681~~625,~~297~~059.7306
	TOTAL AVAILABLE FUNDS TO BONDHOLDERS							128,~~684~~898,~~879~~905.6401
	Interest Payable to Bondholders							1,~~681~~625,~~297~~059.7306
	Principal Payment Amount Payable to Bondholders							117,~~003~~273,~~581~~845.9195
PRINCIPAL - COLLECTIONS								TOTAL
	Scheduled Principal							~~307~~302,~~498~~467.0279
	Curtailments							58155,~~317~~974.6254
	Prepayments in Full							106,~~278~~368,~~703~~265.3786
	Repurchases/Substitutions							~~359~~447,~~062~~137.9076
	Liquidations							0.00
	Insurance Principal							0.00
	Other Additional Principal							0.00
	LESS: Delinquent Principal							(34,~~600~~838.5649)
	LESS: Realized Losses							0.00
	Principal Advanced							34,~~600~~838.5649
	TOTAL PRINCIPAL							117,~~003~~273,~~581~~845.9195
				Page 4 of 21				© COPYRIGHT 2003 Deutsche Bank
	IndyMac RAST 2003-A4
	IndyMac Residential Asset Securitization Trust 2003-A4
	Mortgage Pass-Through Certificates
	Collection Account Report for August 25, 2003 Distribution
	Collection Account Report for September 25, 2003 Distribution
	Collection Account Report
PRINCIPAL - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
PRINCIPAL - OTHER ACCOUNTS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - COLLECTIONS								TOTAL
	Scheduled Interest							1,~~765~~705,~~012~~060.1924
	Repurchases/Substitutions							2,~~169~~980.3492
	Liquidations							0.00
	Insurance Interest							0.00
	Other Additional Interest							0.00
	Prepayment Interest Shortfalls							(79,~~306~~988.7549)
	Delinquent Interest							(2229,~~964~~721.7136)
	Interest Realized Losses							0.00
	Compensating Interest							79,~~306~~988.7549
	Interest Advanced							2229,~~964~~721.7135
	Capitalized Interest							0.00
	TOTAL INTEREST							1,~~767~~708,~~181~~041.5315
				Page 5 of 21				© COPYRIGHT 2003 Deutsche Bank
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	Collection Account Report
INTEREST - WITHDRAWALS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - OTHER ACCOUNTS								TOTAL
SPACE INTENTIONALLY LEFT BLANK
INTEREST - FEES								TOTAL
	Master Servicing Fees							0.00
	Current Servicing Fees							8279,~~833~~661.5523
	Delinquent Servicing Fees							~~987~~1,327.8624
	Trustee Fees							21,~~062~~993.3962
	TOTAL INTEREST FEES							8582,~~883~~982.8009
				Page 6 of 21				© COPYRIGHT 2003 Deutsche Bank
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	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 21				© COPYRIGHT 2003 Deutsche Bank
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	Collateral Report
COLLATERAL								TOTAL
	Loan Count:
	Original							1045
	Prior							~~993~~969
	Prefunding							-
	Scheduled Paid Offs							-
	Full Voluntary Prepayments							(2314)
	Repurchases							(1)
	Liquidations							-
	Current							~~969~~954
	Principal Balance:
	Original							349,999,381.33
	Prior							~~329~~318,~~982~~978,~~557~~975.8897
	Prefunding							-
	Scheduled Principal							(~~307~~302,~~498~~467.0279)
	Partial and Full Voluntary Prepayments							(106,~~337~~524,~~020~~240.9940)
	Repurchases							(~~359~~447,~~062~~137.9076)
	Liquidations							-
	Current							~~318~~311,~~978~~705,~~975~~130.9702
PREFUNDING								TOTAL
	Remaining Pre-Funding Amount							0.00
Current Prin Balance by Groups (in millions of dollars)					Total Current Principal Balance (in millions of dollars)
				Page 8 of 21				© COPYRIGHT 2003 Deutsche Bank
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CHARACTERISTICS								TOTAL
	Weighted Average Coupon Original							6.434559%
	Weighted Average Coupon Prior							6.~~428452~~426454%
	Weighted Average Coupon Current							6.~~426454~~425657%
	Weighted Average Months to Maturity Original							357
	Weighted Average Months to Maturity Prior							~~354~~353
	Weighted Average Months to Maturity Current							~~353~~352
	Weighted Avg Remaining Amortization Term Original							-
	Weighted Avg Remaining Amortization Term Prior							-
	Weighted Avg Remaining Amortization Term Current							-
	Weighted Average Seasoning Original							2.54
	Weighted Average Seasoning Prior							56.1615
	Weighted Average Seasoning Current							6.1588
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 21				© COPYRIGHT 2003 Deutsche Bank
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	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 PPIS							79,~~306~~988.7549
	Current Net PPIS							0.00
	Delinquent Servicing Fees							~~987~~1,327.8624
	TOTAL SERVICING FEES							8380,~~821~~988.4147
	TOTAL ADVANCES FOR CURRENT PERIOD							2533,~~577~~232.4160
ADDITIONAL COLLATERAL INFORMATION								TOTAL
	Net Mortgage Rate							6.~~114133~~113478%
				Page 10 of 21				© COPYRIGHT 2003 Deutsche Bank
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	Delinquency Report - Total
				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		-	12,~~684~~852,~~346~~034.4376	~~430~~84,~~674~~785.5674	1,~~147~~101,~~131~~883.0054	34,~~262~~038,~~151~~704.9904
		% Balance		~~0.00%~~	0.5391%	0.1403%	0.3635%	1.0230%
		# Loans		-	811	41	36	1518
		% # Loans		~~0.00%~~	01.8315%	0.4110%	0.3163%	1.5589%
FORECLOSURE		Balance		-	-	-	~~525~~1,~~776~~018,230.6232	~~525~~1,~~776~~018,230.6232
		% Balance		0.00%	0.00%	0.00%	0.1633%	0.1633%
		# Loans		-	-	-	23	23
		% # Loans		0.00%	0.00%	0.00%	0.2131%	0.2131%
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		-	12,~~684~~852,~~346~~034.4376	~~430~~84,~~674~~785.5674	12,~~672~~120,~~907~~113.6286	35,~~787~~056,~~928~~934.6136
		% Balance		0.00%	0.5391%	0.1403%	0.5268%	1.1962%
		# Loans		-	811	41	59	1721
		% # Loans		0.00%	01.8315%	0.4110%	0.5294%	12.7520%
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 21				© COPYRIGHT 2003 Deutsche Bank
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SUMMARY				LOAN GROUP
Total Loan Count = 0				Loan Group 1 = Group I 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 21				© COPYRIGHT 2003 Deutsche Bank
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	Prepayment Report - Voluntary Prepayments
VOLUNTARY PREPAYMENTS								TOTAL
	Current
	Number of Paid in Full Loans							2314
	Number of Repurchased Loans							1
	Total Number of Loans Prepaid in Full							2415
	Paid in Full Balance							106,~~278~~368,~~703~~265.3786
	Repurchased Loans Balance							~~359~~447,~~062~~137.9076
	Curtailments Amount							58155,~~317~~974.6254
	Total Prepayment Amount							106,~~696~~971,~~083~~378.8916
	Cumulative
	Number of Paid in Full Loans							7387
	Number of Repurchased Loans							34
	Total Number of Loans Prepaid in Full							7691
	Paid in Full Balance							2834,~~459~~827,~~657~~923.7864
	Repurchased Loans Balance							~~863~~1,~~213~~310,351.7450
	Curtailments Amount							96252,~~702~~676.3589
	Total Prepayment Amount							2936,~~419~~390,~~573~~952.8703
SPACE INTENTIONALLY LEFT BLANK
Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)
				Page 13 of 21				© COPYRIGHT 2003 Deutsche Bank
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VOLUNTARY PREPAYMENT RATES								TOTAL
	SMM							32.2419%
	3 Months Avg SMM							2.6081%
	12 Months Avg SMM
	Avg SMM Since Cut-off							1.7582%
	CPR							3223.6931%
	3 Months Avg CPR							2729.0700%
	12 Months Avg CPR
	Avg CPR Since Cut-off							19.0779%
	PSA							~~2656~~1695.6039%
	3 Months Avg PSA Approximation							~~2609~~2391.4356%
	12 Months Avg PSA Approximation
	Avg PSA Since Cut-off Approximation							~~2208~~2086.5525%
CPR by Groups					Total CPR
PSA by Groups					Total PSA
				Page 14 of 21				© COPYRIGHT 2003 Deutsche Bank
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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 21				© COPYRIGHT 2003 Deutsche Bank
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	Prepayment Detail Report - Loans Prepaid in Full During Current Distribution
SUMMARY						LOAN GROUP
Total Loan Count = 24						Loan Group 1 = Group I Group
Total Loan Count = 15						Loan Group 1 = Group I Group
Total Original Principal Balance = 10,693,700.00
Total Original Principal Balance = 6,949,270.00
Total Prepayment Amount = 10,637,766.27
Total Prepayment Amount = 6,815,403.62
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
620982 1			266,000.00	251,183.82	Aug-14-03	6.875%	CA - 76.00%	Paid Off - 360	Oct-30-98
306438 1			980,000.00	922,983.32	Aug-22-03	7.500%	CA - 46.70%	Paid Off - 360	Mar-16-98
1945203 1			240,300.00	239,265.81	Jul-16-03	7.750%	CA - 90.00%	Paid Off - 360	Dec-12-02
309314 1			235,000.00	215,092.64	Aug-15-03	7.250%	CA - 100.00%	Paid Off - 360	Mar-20-98
1965254 1			114,000.00	113,597.84	Aug-09-03	10.875%	NJ - 95.00%	Paid Off - 360	Oct-25-02
620733 1			516,800.00	484,412.72	Aug-29-03	7.000%	CA - 80.00%	Paid Off - 360	Apr-28-98
1996762 1			489,000.00	485,700.92	Jul-23-03	6.250%	CA - 21.73%	Paid Off - 360	Nov-15-02
1953561 1			195,000.00	194,155.14	Aug-02-03	6.000%	CA - 32.50%	Paid Off - 360	Feb-27-03
1998561 1			475,000.00	471,870.89	Aug-14-03	6.375%	CA - 47.98%	Paid Off - 360	Nov-15-02
2153607 1			175,920.00	174,929.25	Aug-28-03	6.375%	CA - 80.00%	Paid Off - 360	Jan-07-03
2041544 1			499,500.00	496,753.71	Aug-06-03	6.500%	CA - 67.96%	Paid Off - 360	Dec-12-02
2192432 1			650,000.00	646,884.00	Aug-21-03	6.250%	CA - 72.22%	Paid Off - 360	Feb-13-03
2173754 1			765,000.00	762,703.88	Aug-13-03	6.000%	WI - 67.40%	Paid Off - 360	Mar-04-03
2205669 1			650,000.00	646,627.10	Aug-15-03	6.000%	CA - 57.02%	Paid Off - 360	Feb-21-03
2179533 1			480,000.00	478,119.51	Aug-08-03	6.125%	MD - 64.00%	Paid Off - 360	Feb-14-03
2215262 1			650,000.00	647,513.69	Aug-20-03	6.250%	CA - 50.00%	Paid Off - 360	Mar-05-03
2187924 1			284,900.00	283,067.57	Jul-16-03	6.500%	CA - 81.40%	Paid Off - 360	Nov-24-02
2229573 1			500,000.00	497,482.97	Aug-25-03	6.000%	CA - 50.00%	Paid Off - 360	Feb-27-03
2189221 1			215,000.00	214,413.73	Jul-31-03	6.500%	NJ - 60.56%	Paid Off - 360	Mar-20-03
2240339 1			592,900.00	590,840.79	Aug-22-03	6.750%	CA - 70.00%	Paid Off - 360	Mar-15-03
2197766 1			566,250.00	564,668.26	Aug-15-03	6.375%	IL - 75.00%	Paid Off - 360	Mar-12-03
2252173 1			126,850.00	126,185.40	Aug-26-03	6.750%	MD - 58.73%	Paid Off - 360	Dec-31-02
2200784 1			290,250.00	289,419.48	Jul-28-03	6.250%	CA - 75.00%	Paid Off - 360	Mar-04-03
2262767 1			735,000.00	731,391.47	Aug-29-03	6.125%	UT - 66.82%	Paid Off - 360	May-22-02
2201592 1			405,000.00	403,550.27	Jul-31-03	6.000%	CA - 59.30%	Paid Off - 360	Mar-11-03
2278587 1			385,000.00	383,455.38	Aug-26-03	6.000%	AZ - 71.96%	Paid Off - 360	Mar-05-03
2201847 1			522,000.00	520,576.61	Aug-15-03	6.500%	NY - 74.57%	Paid Off - 360	Mar-01-03
2323727 1			106,800.00	106,311.99	Aug-02-03	6.500%	AZ - 75.00%	Paid Off - 360	Feb-24-03
2229028 1			363,800.00	362,374.76	Jul-24-03	6.125%	CA - 52.34%	Paid Off - 360	Feb-24-03
2293181 1			450,000.00	447,137.76	Aug-31-03	8.000%	NJ - 60.65%	Repur/Subs - 360	Jan-29-03
2230235 1			825,000.00	821,992.43	Aug-01-03	6.500%	CA - 75.00%	Paid Off - 360	Feb-26-03
2239015 1			595,000.00	592,830.92	Jul-16-03	6.500%	CA - 62.63%	Paid Off - 360	Feb-26-03
2240690 1			572,000.00	570,440.29	Aug-06-03	6.500%	TN - 80.00%	Paid Off - 360	Mar-05-03
2248867 1			339,600.00	338,628.26	Jul-23-03	6.250%	IL - 71.50%	Paid Off - 360	Mar-12-03
2254864 1			825,000.00	821,992.43	Jul-28-03	6.500%	CA - 75.00%	Paid Off - 360	Feb-26-03
2258427 1			388,000.00	386,183.95	Jul-18-03	6.375%	MD - 79.83%	Paid Off - 360	May-13-02
2310648 1			490,000.00	488,529.27	Jul-13-03	6.000%	CA - 70.00%	Paid Off - 360	Mar-04-03
2316541 1			322,700.00	320,838.76	Aug-13-03	6.250%	MD - 67.94%	Paid Off - 360	Dec-10-02
2121152 1			360,400.00	359,062.90	Jul-31-03	7.250%	NY - 80.00%	Repur/Subs - 360	Feb-27-03
					Page 16 of 21				© COPYRIGHT 2003 Deutsche Bank
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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.
SPACE INTENTIONALLY LEFT BLANK
							3 Months Moving Average
Collateral Loss Severity Approximation by Groups					Collateral Loss Severity Approximation
				Page 17 of 21				© COPYRIGHT 2003 Deutsche Bank
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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 21				© COPYRIGHT 2003 Deutsche Bank
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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 21				© COPYRIGHT 2003 Deutsche Bank
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SUMMARY						LOAN GROUP
Total Loan Count = 0						Loan Group 1 = Group I 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 21				© COPYRIGHT 2003 Deutsche Bank
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	Triggers, Adj. Rate Cert. and Miscellaneous Report
TRIGGER EVENTS								TOTAL
	Senior Credit Depletion Date							No
ADJUSTABLE RATE CERTIFICATE INFORMATION								TOTAL
SPACE INTENTIONALLY LEFT BLANK
ADDITIONAL INFORMATION								TOTAL
	Senior Percentage							95.~~251493~~097607%
	Subordinate Percentage							4.~~748507~~902393%
	Senior Prepayment Percentage							100.000000%
	Subordinate Prepayment Percentage							0.000000%
	Current Special Hazard Loss Coverage Amount							3,~~858~~855,~~796~~108.1088
	Current Fraud Loss Coverage Amount							3,500,000.00
	Current Bankruptcy Loss Coverage Amount							100,000.00
				Page 21 of 21				© COPYRIGHT 2003 Deutsche Bank

Filing Compare · INDYMAC MBS INC RESIDENTIAL ASSET SECUR TRUST 2003-A4