
                                       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 27, 2004
                          (Date of earliest event reported)

            Indymac MBS Inc (as Depositor under the Pooling and Servicing
                Agreement, dated as June 1, 2004, providing for the
                issuance of IndyMAc INDX Mortgage Loan Trust 2004-AR4
                Mortgage Pass-Through Certificates, Series 2004-AR4)
                 (Exact name of registrant as specified in charter)


                                         DELAWARE
                     (State or Other Jurisdiction of Incorporation)

               333-116470-05                         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 27, 2004.

                                    Signatures

               Pursuant to the requirements of the Securities Exchange Act of
          1934, the Registrant has duly caused this report to be signed on its
          behalf by the undersigned, hereunto duly authorized.


                                  Deutsche Bank National Trust Company,
                                  in its capacity as Trustee under the
                                  Pooling and Servicing Agreement on
                                  behalf of Indymac MBS Inc, Registrant


          Date:  Sep 27, 2004               By:  /s/  Katherine M. Wannenmacher
                                            Katherine M. Wannenmacher
                                            Vice President


                                   EXHIBIT INDEX

          DOCUMENT

          99.1 Monthly Remittance Statement to the Certificateholders
          dated as of September 27, 2004.


	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds


	September 27, 2004 Distribution


	Contents



			TABLE OF CONTENTS

								Page

			1.	Contents				1
			2.	Certificate Payment Report				2
			3.	Collection Account Report				4
			4.	Credit Enhancement Report				7
			5.	Collateral Report				8
			6.	Delinquency Report				11
			7.	REO Report				15
			8.	Prepayment Report				16
			9.	Prepayment Detail Report				19
			10.	Realized Loss Report				20
			11.	Realized Loss Detail Report				23
			12.	Triggers, Adj. Rate Cert. and Miscellaneous Report				24
			13.	Other Related Information				25
			14.	Additional Certificate Report				26



				Total Number of Pages				26



			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
				Factor Information: (800) 735-7777
				Main Phone Number: (714) 247-6000



ISSUANCE INFORMATION

	Seller:		IndyMac Bank					Cut-Off Date: June 1, 2004
	Certificate Insurer(s):							Closing Date: June 29, 2004
								First Payment Date: July 26, 2004
	Servicer(s):		IndyMac Bank Master Servicer


								Distribution Date: September 27, 2004
	Underwriter(s):		Lehman Brothers Underwriter					Record Date: August 31, 2004







						Page 1 of 26					© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds
	REMIC I Series 2004-AR4
	Certificate Payment Report for September 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)

1-A		332,882,000.00			325,633,654.87	1,305,649.18	5,903,426.68	7,209,075.86	-	-	319,730,228.19
2-A		183,084,000.00			180,794,758.33	786,269.86	1,384,221.97	2,170,491.83	-	-	179,410,536.36
3-A		213,509,000.00			209,839,815.76	863,764.84	1,968,696.54	2,832,461.38	-	-	207,871,119.22
A-R		100.00			-	0.00	-	0.00	-	-	-
B-1		30,591,000.00			30,561,893.66	126,095.96	20,391.80	146,487.76	-	-	30,541,501.86
B-2		8,628,000.00			8,619,790.74	35,564.58	5,751.38	41,315.96	-	-	8,614,039.36
B-3		4,706,000.00			4,701,522.39	19,398.11	3,137.00	22,535.11	-	-	4,698,385.40
B-4		5,098,000.00			5,093,149.42	21,013.93	3,398.30	24,412.23	-	-	5,089,751.12
B-5		3,530,000.00			3,526,641.32	14,550.64	2,353.08	16,903.72	-	-	3,524,288.24
B-6		2,353,358.00			2,351,118.87	9,700.53	1,568.74	11,269.27	-	-	2,349,550.13
P		100.00			100.00	6,949.37	-	6,949.37	-	-	100.00


Total		784,381,558.00			771,122,445.37	3,188,957.01	9,292,945.49	12,481,902.49	-	-	761,829,499.88


	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)

1-A	07/31/04	08/31/04		A-30/360	45660NQ24	332,882,000.00	978.225482	3.922258	17.734292	21.656551	960.491190
2-A	07/31/04	08/31/04		A-30/360	45660NQ32	183,084,000.00	987.496222	4.294585	7.560584	11.855169	979.935638
3-A	07/31/04	08/31/04		A-30/360	45660NQ40	213,509,000.00	982.814850	4.045566	9.220672	13.266239	973.594177
A-R				A-30/360	45660NQ57	100.00	-	0.002000	-	0.002000	-
B-1	07/31/04	08/31/04		A-30/360	45660NQ65	30,591,000.00	999.048533	4.121995	0.666595	4.788590	998.381938
B-2	07/31/04	08/31/04		A-30/360	45660NQ73	8,628,000.00	999.048533	4.121996	0.666595	4.788591	998.381938
B-3	07/31/04	08/31/04		A-30/360	45660NQ81	4,706,000.00	999.048533	4.121995	0.666595	4.788590	998.381938
B-4	07/31/04	08/31/04		A-30/360	45660NQ99	5,098,000.00	999.048533	4.121995	0.666595	4.788590	998.381938
B-5	07/31/04	08/31/04		A-30/360	45660NR23	3,530,000.00	999.048533	4.121994	0.666595	4.788589	998.381938
B-6	07/31/04	08/31/04		A-30/360	45660NR31	2,353,358.00	999.048537	4.121995	0.666595	4.788590	998.381942
P	07/31/04	08/31/04		F-30/360	IN04A401P	100.00	1,000.000000	69,493.700000	-	69,493.700000	1,000.000000


							Page 2 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds
	REMIC I Series 2004-AR4
	Certificate Payment Report for September 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)

1-A	332,882,000.00		3,968,800.44		12,820,768.79	331,003.02	13,151,771.81	17,120,572.25	-	-	319,730,228.19
2-A	183,084,000.00		2,374,669.01		3,456,400.99	217,062.65	3,673,463.64	6,048,132.65	-	-	179,410,536.36
3-A	213,509,000.00		2,619,468.75		5,454,433.03	183,447.75	5,637,880.78	8,257,349.53	-	-	207,871,119.22
A-R	100.00		0.00		-	100.00	100.00	100.00	-	-	-
B-1	30,591,000.00		378,875.55		18,574.26	30,923.88	49,498.14	428,373.69	-	-	30,541,501.86
B-2	8,628,000.00		106,859.48		5,238.75	8,721.89	13,960.64	120,820.12	-	-	8,614,039.36
B-3	4,706,000.00		58,284.74		2,857.39	4,757.21	7,614.60	65,899.34	-	-	4,698,385.40
B-4	5,098,000.00		63,139.73		3,095.41	5,153.47	8,248.88	71,388.61	-	-	5,089,751.12
B-5	3,530,000.00		43,719.74		2,143.35	3,568.41	5,711.76	49,431.50	-	-	3,524,288.24
B-6	2,353,358.00		29,146.80		1,428.90	2,378.97	3,807.87	32,954.67	-	-	2,349,550.13
P	100.00		11,824.90		-	-	-	11,824.90	-	-	100.00


Total	784,381,558.00		9,654,789.15		21,764,940.87	787,117.24	22,552,058.12	32,206,847.26	-	-	761,829,499.88


	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)

1-A	4.81148%	325,633,654.87			1,305,649.18	-	-	-	1,305,649.18	1,305,649.18	-
2-A	5.21876%	180,794,758.33			786,269.86	-	-	-	786,269.86	786,269.86	-
3-A	4.93957%	209,839,815.76			863,764.84	-	-	-	863,764.84	863,764.84	-
A-R		-			-	-	-	-	-	0.00	-
B-1	4.95111%	30,561,893.66			126,095.96	-	-	-	126,095.96	126,095.96	-
B-2	4.95111%	8,619,790.74			35,564.58	-	-	-	35,564.58	35,564.58	-
B-3	4.95111%	4,701,522.39			19,398.11	-	-	-	19,398.11	19,398.11	-
B-4	4.95111%	5,093,149.42			21,013.93	-	-	-	21,013.93	21,013.93	-
B-5	4.95111%	3,526,641.32			14,550.64	-	-	-	14,550.64	14,550.64	-
B-6	4.95111%	2,351,118.87			9,700.53	-	-	-	9,700.53	9,700.53	-
P		100.00			-	-	-	-	-	6,949.37	-


Total		771,122,445.37			3,182,007.64	-	-	-	3,182,007.64	3,188,957.01	-


							Page 3 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collection Account Report for September 27, 2004 Distribution


	Collection Account Report


SUMMARY					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Principal Collections				1,973,276.57	1,389,684.65	5,929,984.27	9,292,945.49
	Principal Withdrawals				0.00	0.00	0.00	0.00
	Principal Other Accounts				0.00	0.00	0.00	0.00
	TOTAL PRINCIPAL				1,973,276.57	1,389,684.65	5,929,984.27	9,292,945.49

	Interest Collections				947,096.86	863,234.81	1,439,220.93	3,249,552.60
	Interest Withdrawals				0.00	0.00	0.00	0.00
	Interest Other Accounts				0.00	0.00	6,949.37	6,949.37
	Interest Fees				(17,220.56)	(17,147.05)	(33,177.34)	(67,544.96)

	TOTAL INTEREST				929,876.30	846,087.76	1,412,992.96	3,188,957.01

	TOTAL AVAILABLE FUNDS TO BONDHOLDERS				2,903,152.87	2,235,772.41	7,342,977.23	12,481,902.50

	Interest Payable to Bondholders				929,876.30	846,087.76	1,412,992.96	3,188,957.01


PRINCIPAL - COLLECTIONS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Scheduled Principal				64,419.45	77,266.29	116,995.97	258,681.71
	Curtailments				90,202.28	112,541.43	97,840.28	300,583.99
	Prepayments in Full				1,818,654.84	1,199,876.93	5,460,199.74	8,478,731.51
	Repurchases/Substitutions				0.00	0.00	254,948.28	254,948.28
	Liquidations				0.00	0.00	0.00	0.00
	Insurance Principal				0.00	0.00	0.00	0.00
	Other Additional Principal				0.00	0.00	0.00	0.00
	LESS: Delinquent Principal				(50,346.82)	(56,616.77)	(95,018.55)	(201,982.14)
	LESS: Realized Losses				0.00	0.00	0.00	0.00
	PLUS: Recoveries				0.00	0.00	0.00	0.00
	PLUS: Substitution Shortfall Principal				0.00	0.00	0.00	0.00
	PLUS: Principal Loan Adjustments				0.00	0.00	0.00	0.00
	PLUS: Principal Advanced				50,346.82	56,616.77	95,018.55	201,982.14
	TOTAL PRINCIPAL				1,973,276.57	1,389,684.65	5,929,984.27	9,292,945.49


				Page 4 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collection Account Report for September 27, 2004 Distribution


	Collection Account Report


PRINCIPAL - WITHDRAWALS					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


PRINCIPAL - OTHER ACCOUNTS					GROUP 3	GROUP 2	GROUP 1	TOTAL



	TOTAL PRINCIPAL OTHER ACCOUNTS				0.00	0.00	0.00	0.00


INTEREST - COLLECTIONS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Scheduled Interest				1,001,411.51	907,695.02	1,515,841.66	3,424,948.19
	Repurchases/Substitutions				0.00	0.00	1,248.18	1,248.18
	Liquidations				0.00	0.00	0.00	0.00
	Insurance Interest				0.00	0.00	0.00	0.00
	Other Additional Interest				0.00	0.00	0.00	0.00
	LESS: Prepayment Interest Shortfalls				(142.93)	(793.98)	(4,255.89)	(5,192.80)
	LESS: Delinquent Interest				(775,998.82)	(666,902.39)	(1,085,208.14)	(2,528,109.35)
	LESS: Interest Realized Losses				0.00	0.00	0.00	0.00
	PLUS: Compensating Interest				142.93	793.98	4,255.89	5,192.80
	LESS: Civil Relief Act Shorfalls				0.00	0.00	0.00	0.00
	PLUS: Substiution Shortfall Interest				0.00	0.00	0.00	0.00
	PLUS: Interest Loan Adjustments				0.00	0.00	0.00	0.00
	LESS: Excess, Special Hazard, Fraud, & Bankruptcy Interest Losses				0.00	0.00	0.00	0.00
	Interest Advanced				721,684.17	622,442.18	1,007,339.23	2,351,465.58
	TOTAL INTEREST				947,096.86	863,234.81	1,439,220.93	3,249,552.60


				Page 5 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collection Account Report for September 27, 2004 Distribution


	Collection Account Report


INTEREST - WITHDRAWALS					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


INTEREST - OTHER ACCOUNTS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Prepayment Penalties				0.00	0.00	6,949.37	6,949.37



	TOTAL INTEREST OTHER ACCOUNTS				0.00	0.00	6,949.37	6,949.37


INTEREST - FEES					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Current Servicing Fees				16,279.31	16,336.43	31,716.21	64,331.95
	Trustee Fees				941.25	810.62	1,461.13	3,213.01
	PMI Fees				0.00	0.00	0.00	0.00

	TOTAL INTEREST FEES				17,220.56	17,147.05	33,177.34	67,544.96


				Page 6 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Credit Enhancement Report for September 27, 2004 Distribution


	Credit Enhancement Report


ACCOUNTS					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


INSURANCE					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


STRUCTURAL FEATURES					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


				Page 7 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collateral Report for September 27, 2004 Distribution


	Collateral Report


COLLATERAL					GROUP 3	GROUP 2	GROUP 1	TOTAL
	Loan Count:
	*Original*				468	989	1343	2800
	Prior				461	981	1,318	2,760
	Prefunding				-	-	-	-
	Scheduled Paid Offs				-	-	-	-
	Full Voluntary Prepayments				(4)	(6)	(20)	(30)
	Repurchases				-	-	(1)	(1)
	Liquidations				-	-	-	-
	Current				457	975	1,297	2,729

	*Principal Balance:*
	Original				229,579,204.05	196,864,609.76	357,937,644.19	784,381,458.00
	Prior				225,900,687.00	194,549,273.25	350,672,385.11	771,122,345.36
	Prefunding				-	-	-	-
	Scheduled Principal				(64,419.45)	(77,266.29)	(116,995.97)	(258,681.71)
	Partial and Full Voluntary Prepayments				(1,908,857.12)	(1,312,418.36)	(5,558,040.02)	(8,779,315.50)
	Repurchases				-	-	(254,948.28)	(254,948.28)
	Liquidations				-	-	-	-
	Current				223,927,410.43	193,159,588.60	344,742,400.84	761,829,399.87

PREFUNDING					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


	Group 1		Group 3
	Group 2
Current Prin Balance by Groups (in millions of dollars)					Total Current Principal Balance (in millions of dollars)


				Page 8 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collateral Report for September 27, 2004 Distribution


	Collateral Report


CHARACTERISTICS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Weighted Average Coupon Original				5.333255%	5.601454%	5.202674%	5.340980%
	Weighted Average Coupon Prior				5.327332%	5.598090%	5.199703%	5.337238%
	Weighted Average Coupon Current				5.319567%	5.598757%	5.191478%	5.331755%
	Weighted Average Months to Maturity Original				356	359	359	358
	Weighted Average Months to Maturity Prior				355	358	358	357
	Weighted Average Months to Maturity Current				354	357	357	356
	Weighted Avg Remaining Amortization Term Original				356	358	358	357
	Weighted Avg Remaining Amortization Term Prior				355	357	357	356
	Weighted Avg Remaining Amortization Term Current				354	356	356	355
	Weighted Average Seasoning Original				2.15	1.82	1.92	1.96
	Weighted Average Seasoning Prior				3.15	2.82	2.92	2.96
	Weighted Average Seasoning Current				4.12	3.82	3.88	3.93

Note: Original information refers to deal issue.


	Group 1		Group 3
	Group 2
WAC by Groups					Total WAC


WARAT by Groups					Total WARAT


Note: Dates correspond to distribution dates.
				Page 9 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Collateral Report for September 27, 2004 Distribution


	Collateral Report


ARM CHARACTERISTICS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Weighted Average Margin Original				2.590%	2.609%	2.618%
	Weighted Average Margin Prior				2.589%	2.608%	2.618%
	Weighted Average Margin Current				2.588%	2.608%	2.617%
	Weighted Average Max Rate Original				11.074%	11.442%	11.040%
	Weighted Average Max Rate Prior				11.067%	11.438%	11.036%
	Weighted Average Max Rate Current				11.058%	11.440%	11.028%
	Weighted Average Min Rate Original				2.590%	2.609%	2.618%
	Weighted Average Min Rate Prior				2.589%	2.608%	2.618%
	Weighted Average Min Rate Current				2.588%	2.608%	2.617%
	Weighted Average Cap Up Original				1.773%	1.596%	1.515%
	Weighted Average Cap Up Prior				1.776%	1.599%	1.514%
	Weighted Average Cap Up Current				1.772%	1.600%	1.514%
	Weighted Average Cap Down Original				1.773%	1.596%	1.515%
	Weighted Average Cap Down Prior				1.776%	1.599%	1.514%
	Weighted Average Cap Down Current				1.772%	1.600%	1.514%

Note: Original information refers to deal issue.

SERVICING FEES / ADVANCES					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Current Servicing Fees				16,279.31	16,336.43	31,716.21	64,331.95
	Delinquent Servicing Fees				54,314.65	44,460.21	77,868.91	176,643.77
	TOTAL SERVICING FEES				70,593.96	60,796.64	109,585.12	240,975.72

	Total Servicing Fees				70,593.96	60,796.64	109,585.12	240,975.72
	Compensating Interest				(142.93)	(793.98)	(4,255.89)	(5,192.80)
	Delinquent Servicing Fees				(54,314.65)	(44,460.21)	(77,868.91)	(176,643.77)
	COLLECTED SERVICING FEES				16,136.38	15,542.45	27,460.32	59,139.15

	Total Advanced Principal For Current Payment Date				50,346.82	56,616.77	95,018.55	201,982.14
	Total Advanced Interest For Current Payment Date				721,684.17	622,442.18	1,007,339.23	2,351,465.58
	TOTAL ADVANCES FOR CURRENT PERIOD				772,030.99	679,058.95	1,102,357.78	2,553,447.72


ADDITIONAL COLLATERAL INFORMATION					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Prepayment Interest Shortfall (PPIS)				142.93	793.98	4,255.89	5,192.80
	Compensating Interest				(142.93)	(793.98)	(4,255.89)	(5,192.80)
	Net Prepayment Interest Shortfall (Net PPIS)				0.00	0.00	0.00	0.00

	Weighted Average Net Mortgage Rate				4.939567%	5.218757%	4.811478%	4.951755%


				Page 10 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Delinquency Report for September 27, 2004 Distribution


	Delinquency Report - Total


				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		###########	6,445,170.33	725,017.17	194,217.67	7,364,405.17
		% Balance		72.84%	0.85%	0.10%	0.03%	0.97%
		# Loans		1,968	20	3	1	24
		% # Loans		72.11%	0.73%	0.11%	0.04%	0.88%
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		-	6,445,170.33	725,017.17	194,217.67	7,364,405.17
		% Balance		0.00%	0.85%	0.10%	0.03%	0.97%
		# Loans		-	20	3	1	24
		% # Loans		0.00%	0.73%	0.11%	0.04%	0.88%
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 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Delinquency Report for September 27, 2004 Distribution


	Delinquency Report - Group 1 Group


				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		###########	5,355,967.01	513,897.17	-	5,869,864.18
		% Balance		70.54%	1.55%	0.15%	0.00%	1.70%
		# Loans		913	14	2	-	16
		% # Loans		70.39%	1.08%	0.15%	0.00%	1.23%
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		-	5,355,967.01	513,897.17	-	5,869,864.18
		% Balance		0.00%	1.55%	0.15%	0.00%	1.70%
		# Loans		-	14	2	-	16
		% # Loans		0.00%	1.08%	0.15%	0.00%	1.23%
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 12 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Delinquency Report for September 27, 2004 Distribution


	Delinquency Report - Group 2 Group


				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		###########	1,089,203.32	211,120.00	194,217.67	1,494,540.99
		% Balance		72.85%	0.56%	0.11%	0.10%	0.77%
		# Loans		704	6	1	1	8
		% # Loans		72.21%	0.62%	0.10%	0.10%	0.82%
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		-	1,089,203.32	211,120.00	194,217.67	1,494,540.99
		% Balance		0.00%	0.56%	0.11%	0.10%	0.77%
		# Loans		-	6	1	1	8
		% # Loans		0.00%	0.62%	0.10%	0.10%	0.82%
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 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Delinquency Report for September 27, 2004 Distribution


	Delinquency Report - Group 3 Group


				<1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT		Balance		###########	-	-	-	-
		% Balance		76.35%	0.00%	0.00%	0.00%	0.00%
		# Loans		351	-	-	-	-
		% # Loans		76.81%	0.00%	0.00%	0.00%	0.00%
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		-	-	-	-	-
		% Balance		0.00%	0.00%	0.00%	0.00%	0.00%
		# Loans		-	-	-	-	-
		% # Loans		0.00%	0.00%	0.00%	0.00%	0.00%
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 14 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	REO Report for September 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				Loan Group 2 = Group 2; REO Book Value = 000.00
Total Current Balance = 000.00				Loan Group 3 = Group 3; REO Book Value = 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 15 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Prepayment Report for September 27, 2004 Distribution


	Prepayment Report - Voluntary Prepayments


VOLUNTARY PREPAYMENTS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	*Current*
	Number of Paid in Full Loans				4	6	20	30
	Number of Repurchased Loans				-	-	1	1
	Total Number of Loans Prepaid in Full				4	6	21	31

	Paid in Full Balance				1,818,654.84	1,199,876.93	5,460,199.74	8,478,731.51
	Repurchased Loans Balance				-	-	254,948.28	254,948.28
	Curtailments Amount				90,202.28	112,541.43	97,840.28	300,583.99
	Total Prepayment Amount				1,908,857.12	1,312,418.36	5,812,988.30	9,034,263.78

	*Cumulative*
	Number of Paid in Full Loans				11	13	45	69
	Number of Repurchased Loans				-	1	1	2
	Total Number of Loans Prepaid in Full				11	14	46	71

	Paid in Full Balance				5,269,451.99	3,083,595.19	12,096,272.03	20,449,319.21
	Repurchased Loans Balance				-	215,200.00	254,948.28	470,148.28
	Curtailments Amount				184,981.04	172,740.04	487,752.31	845,473.39
	Total Prepayment Amount				5,454,433.03	3,471,535.23	12,838,972.62	21,764,940.88

SPACE INTENTIONALLY LEFT BLANK


Total Prepayments by Groups (in thousands of dollars)					Total Prepayments (in thousands of dollars)


				Page 16 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Prepayment Report for September 27, 2004 Distribution


	Prepayment Report - Voluntary Prepayments


VOLUNTARY PREPAYMENT RATES					GROUP 3	GROUP 2	GROUP 1	TOTAL

	SMM				0.85%	0.67%	1.66%	1.17%
	3 Months Avg SMM				0.80%	0.59%	1.21%	0.93%
	12 Months Avg SMM
	Avg SMM Since Cut-off				0.80%	0.59%	1.21%	0.93%

	CPR				9.68%	7.80%	18.18%	13.19%
	3 Months Avg CPR				9.18%	6.87%	13.60%	10.65%
	12 Months Avg CPR
	Avg CPR Since Cut-off				9.18%	6.87%	13.60%	10.65%

	PSA				1174.71%	1021.11%	2345.04%	1676.32%
	3 Months Avg PSA Approximation				1459.96%	1217.97%	2340.81%	1803.13%
	12 Months Avg PSA Approximation
	Avg PSA Since Cut-off Approximation				1459.96%	1217.97%	2340.81%	1803.13%



	Group 1		Group 3
	Group 2


CPR by Groups					Total CPR


PSA by Groups					Total PSA


				Page 17 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Prepayment Report for September 27, 2004 Distribution


	Prepayment Report - Voluntary Prepayments

	Group 1		Group 3
	Group 2

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 18 of 26				© COPYRIGHT 2004 Deutsche Bank


	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Prepayment Detail Report for September 27, 2004 Distribution


	Prepayment Detail Report - Loans Prepaid in Full During Current Distribution


SUMMARY						LOAN GROUP

Total Loan Count = 31						Loan Group 1 = Group 1
Total Original Principal Balance = 8,785,795.00						Loan Group 2 = Group 2
Total Prepayment Amount = 8,733,679.79						Loan Group 3 = Group 3


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

1800193 1			366,400.00	358,088.29	Aug-25-04	5.000%	CA - 80.00%	Paid Off - 360	Sep-12-02
1969754 1			649,950.00	634,459.67	Aug-23-04	4.875%	RI - 65.00%	Paid Off - 360	Nov-25-02
3486320 1			164,800.00	164,800.00	Aug-19-04	5.375%	CA - 80.00%	Paid Off - 360	Feb-23-04
3588123 1			465,804.00	465,804.00	Aug-23-04	5.375%	CA - 80.00%	Paid Off - 360	May-24-04
3626470 1			71,000.00	71,000.00	Aug-31-04	8.125%	FL - 94.96%	Paid Off - 360	Apr-29-04
3651578 1			119,464.00	119,176.32	Aug-30-04	5.000%	FL - 95.00%	Paid Off - 360	May-19-04
3662238 1			24,000.00	23,874.64	Aug-17-04	6.875%	IL - 75.00%	Paid Off - 360	May-20-04
3676626 1			119,200.00	119,200.00	Sep-15-04	5.375%	ID - 80.00%	Paid Off - 360	May-26-04
3684139 1			232,000.00	231,490.67	Sep-13-04	5.625%	CA - 80.00%	Paid Off - 360	May-03-04
3696564 1			104,000.00	103,508.82	Sep-15-04	5.500%	WA - 78.79%	Paid Off - 360	Apr-23-04
3719497 1			330,000.00	327,916.50	Aug-17-04	3.625%	CA - 68.00%	Paid Off - 360	Mar-12-04
3782940 1			278,400.00	278,400.00	Aug-17-04	5.125%	CA - 80.00%	Paid Off - 360	May-24-04
3786659 1			532,000.00	530,798.37	Sep-13-04	4.875%	NJ - 80.00%	Paid Off - 360	Apr-29-04
3811192 1			387,200.00	387,200.00	Aug-31-04	5.000%	CA - 80.00%	Paid Off - 360	May-26-04
3811287 1			322,700.00	321,415.62	Aug-16-04	5.375%	NH - 71.71%	Paid Off - 360	Jan-30-03
3826846 1			207,000.00	206,600.00	Aug-17-04	5.250%	LA - 66.77%	Paid Off - 360	Dec-02-03
3872778 1			167,772.00	167,596.84	Sep-01-04	5.750%	CO - 80.00%	Paid Off - 360	Jun-14-04
3874505 1			330,000.00	325,000.00	Aug-19-04	4.875%	CA - 70.21%	Paid Off - 360	May-20-04
3890692 1			317,870.00	317,870.00	Aug-31-04	7.250%	TX - 95.00%	Paid Off - 360	May-26-04
3909701 1			306,000.00	306,000.00	Sep-10-04	7.125%	CA - 90.00%	Paid Off - 360	Jun-03-04
3398350 2			126,000.00	125,506.38	Aug-20-04	6.125%	NV - 90.00%	Paid Off - 360	Mar-11-04
3620279 2			265,000.00	265,000.00	Aug-31-04	5.375%	IL - 56.99%	Paid Off - 360	Apr-26-04
3670016 2			187,000.00	186,635.57	Sep-01-04	6.125%	CA - 79.57%	Paid Off - 360	May-06-04
3703884 2			141,335.00	141,334.98	Aug-31-04	5.875%	NV - 80.00%	Paid Off - 360	Apr-21-04
3779639 2			154,400.00	154,400.00	Aug-30-04	6.750%	CO - 80.00%	Paid Off - 360	May-28-04
3785870 2			327,000.00	327,000.00	Aug-18-04	5.000%	FL - 65.00%	Paid Off - 360	Apr-22-04
1768756 3			348,000.00	338,085.54	Sep-10-04	5.375%	CA - 80.00%	Paid Off - 360	Jul-15-02
3470635 3			650,000.00	647,066.97	Aug-30-04	5.375%	NY - 72.22%	Paid Off - 360	Jun-16-03
3776140 3			348,000.00	347,288.66	Aug-30-04	5.875%	NJ - 80.00%	Paid Off - 360	May-12-04
3820401 3			487,500.00	486,213.67	Sep-03-04	4.500%	CA - 75.00%	Paid Off - 360	May-10-04
3643702 1			256,000.00	254,948.28	Aug-31-04	5.875%	CA - 80.00%	Repur/Subs - 360	Mar-19-04


					Page 19 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Realized Loss Report for September 27, 2004 Distribution


	Realized Loss Report - Collateral


COLLATERAL REALIZED LOSSES					GROUP 3	GROUP 2	GROUP 1	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							7,711,223.45
	Current Fraud Loss Coverage Amount							23,531,443.00
	Current Bankruptcy Loss Coverage Amount							302,827.00

	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


	Group 1		Group 3				3 Months Moving Average
	Group 2

Collateral Loss Severity Approximation by Groups					Collateral Loss Severity Approximation


				Page 20 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Realized Loss Report for September 27, 2004 Distribution


	Realized Loss Report - Collateral


DEFAULT SPEEDS					GROUP 3	GROUP 2	GROUP 1	TOTAL

	MDR				0.00%	0.00%	0.00%	0.00%
	3 Months Avg MDR				0.00%	0.00%	0.00%	0.00%
	12 Months Avg MDR
	Avg MDR Since Cut-off				0.00%	0.00%	0.00%	0.00%

	CDR				0.00%	0.00%	0.00%	0.00%
	3 Months Avg CDR				0.00%	0.00%	0.00%	0.00%
	12 Months Avg CDR
	Avg CDR Since Cut-off				0.00%	0.00%	0.00%	0.00%

	SDA				0.00%	0.00%	0.00%	0.00%
	3 Months Avg SDA Approximation				0.00%	0.00%	0.00%	0.00%
	12 Months Avg SDA Approximation
	Avg SDA Since Cut-off Approximation				0.00%	0.00%	0.00%	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

	Group 1		Group 3
	Group 2
CDR by Groups					Total CDR


SDA by Groups					Total SDA


				Page 21 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Realized Loss Report for September 27, 2004 Distribution


	Realized Loss Report - Collateral

	Group 1		Group 3
	Group 2

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 22 of 26				© COPYRIGHT 2004 Deutsche Bank


	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Realized Loss Detail Report for September 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						Loan Group 2 = Group 2
Total Current Realized Loss Amount = 0.00						Loan Group 3 = Group 3
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 23 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Triggers, Adj. Rate Cert. and Miscellaneous Report for September 27, 2004 Distribution


	Triggers, Adj. Rate Cert. and Miscellaneous Report


TRIGGER EVENTS					GROUP 3	GROUP 2	GROUP 1	TOTAL



	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					GROUP 3	GROUP 2	GROUP 1	TOTAL
SPACE INTENTIONALLY LEFT BLANK


ADDITIONAL INFORMATION					GROUP 3	GROUP 2	GROUP 1	TOTAL

	Current Senior Percentage				92.890296%	92.930061%	92.859794%	92.886457%
	Next Senior Percentage				0.000000%	0.000000%	0.000000%	0.000000%
	Current Subordinate Percentage				7.109704%	7.069939%	7.140206%	7.113543%
	Next Subordinate Percentage				0.000000%	0.000000%	0.000000%	0.000000%
	Current Senior Prepayment Percentage				100.000000%	100.000000%	100.000000%	100.000000%
	Next Projected Senior Prepayment Percentage				0.000000%	0.000000%	0.000000%	0.000000%
	Current Subordinated Prepayment Percentage				0.000000%	0.000000%	0.000000%	0.000000%
	Next Projected Subordinated Prepayment Percentage				0.000000%	0.000000%	0.000000%	0.000000%


				Page 24 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Other Related Information for September 27, 2004 Distribution


	Other Related Information


ADDITIONAL INFORMATION					GROUP 3	GROUP 2	GROUP 1	TOTAL


	Scheduled Principal
	1 Month Prior							258,681.71
	2 Months Prior							262,571.55
	3 Months Prior							265,863.99
	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							323.68
	2 Months Prior							196.07
	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 25 of 26				© COPYRIGHT 2004 Deutsche Bank
	IndyMac INDX Mortgage Loan Trust 2004-AR4
	Collateralized Asset-Backed Bonds

	Additional Certificate Report for September 27, 2004 Distribution


	Additional Certificate Report


	CLASS	Net PPIS & Relief Act Shortfall Allocation	Unpaid Interest Amount Due	Unpaid Interest Paid	Remaining Unpaid Interest Amount

		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00
		0.00	0.00	0.00	0.00


				Page 26 of 26				© COPYRIGHT 2004 Deutsche Bank

IndyMac INDX Mortgage Loan Trust 2004-AR4 8-K