IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

External Parties

Table of Contents

Page

Seller

1. Certificate Payment Report

IndyMac Bank

2. Collection Account Report

3. Credit Enhancement Report

Servicer(s)

4. Collateral Report

IndyMac Bank

5. Delinquency Report

6. REO Report

Underwriter(s)

7. Foreclosure Report

Lehman Brothers

8. Prepayment Report

9. Prepayment Detail Report

10. Realized Loss Report

11. Realized Loss Detail Report

12. Triggers and Adj. Cert. Report

13. Other Related Information

Total Number of Pages

Dates

Contacts

Cut-Off Date:

February 01, 2007

Marion Hogan

Close Date:

February 27, 2007

Administrator

First Distribution Date:

March 26, 2007

(714) 247-6282

marion.c.hogan@db.com

Address:

Distribution Date:

May 25, 2007

1761 East St. Andrew Place, Santa Ana, CA 92705

Record Date:

April 30, 2007

Factor Information:

(800) 735-7777

May 24, 2007

Main Phone Number:

(714) 247-6000

Determination Date:

May 18, 2007

https://www.tss.db.com/invr

Page 1 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Certificate Payment Report
Current Period Distribution -
			Prior						Current
			Prior

	Class	Original	Principal			Total	Realized	Deferred	Principal

Class	Type	Face Value	Balance	Interest	Principal	Distribution	Loss	Interest	Balance
			(1)	(2)	(3)	(4)=(2)+(3)	(5)	(6)	(7)=(1)-(3)-(5)+(6)
1-A-1	INT	50,000,000.00	49,819,581.84	239,549.16	158,931.17	398,480.33	0.00	0.00	49,660,650.67
1-A-1	INT	50,000,000.00	49,819,581.84	239,549.16	158,931.17	398,480.33	0.00	0.00	49,660,650.67
1-A-2	INT	6,521,739.00	6,498,206.20	30,306.91	20,730.15	51,037.06	0.00	0.00	6,477,476.05
1-A-3	INT	93,816,261.00	93,418,097.41	447,628.38	350,832.16	798,460.54	0.00	0.00	93,067,265.25
1-A-4	INT	16,556,000.00	16,556,000.00	79,330.83	0.00	79,330.83	0.00	0.00	16,556,000.00
2-A-1	INT	176,182,000.00	175,330,517.38	822,592.34	574,494.40	1,397,086.74	0.00	0.00	174,756,022.98
2-A-2	NTL	0.00	0.00	200,170.64	0.00	200,170.64	0.00	0.00	0.00
B-1	INT	9,511,000.00	9,501,706.71	47,482.47	17,962.23	65,444.70	0.00	0.00	9,483,744.48
B-2	INT	4,207,000.00	4,202,889.30	21,878.52	7,945.23	29,823.75	0.00	0.00	4,194,944.07
B-3	INT	3,110,000.00	3,106,961.19	16,545.63	5,873.47	22,419.10	0.00	0.00	3,101,087.72
B-1IO	NTL	0.00	0.00	3,117.35	0.00	3,117.35	0.00	0.00	0.00
B-2IO	NTL	0.00	0.00	503.30	0.00	503.30	0.00	0.00	0.00
PO	PO	819,861.00	819,467.30	0.00	8,660.36	8,660.36	0.00	0.00	810,806.94
B-4	INT	2,012,000.00	2,010,034.05	10,704.12	3,799.81	14,503.93	0.00	0.00	2,006,234.24
B-5	INT	1,646,000.00	1,644,391.68	8,756.95	3,108.59	11,865.54	0.00	0.00	1,641,283.09
B-6	INT	1,463,629.00	1,462,198.88	7,786.71	2,764.17	10,550.88	0.00	0.00	1,459,434.71
A-R	INT	100.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00


Total		365,845,590.00	364,370,051.94	1,936,353.31	1,155,101.74	3,091,455.05	0.00	0.00	363,214,950.20
Total




Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face Value
					Orig. Principal	Prior				Current
					Orig. Principal	Prior				Current
	Period	Period			(with Notional)	Principal			Total	Principal
Class	Starting	Ending	Method	Cusip	Balance	Balance	Interest	Principal	Distribution	Balance
			Method
					(1)	(1)	(2)	(3)	(4)=(2)+(3)	(5)

1-A-1	04/25/07	05/24/07	F-30/360	76113WAA1	50,000,000.00	996.391637	4.790983	3.178623	7.969607	993.213013
1-A-1	04/25/07	05/24/07	F-30/360	76113WAA1	50,000,000.00	996.391637	4.790983	3.178623	7.969607	993.213013
1-A-2	04/25/07	05/24/07	F-30/360	76113WAB9	6,521,739.00	996.391637	4.647060	3.178623	7.825683	993.213014
1-A-3	04/01/07	04/30/07	A-30/360	76113WAC7	93,816,261.00	995.755921	4.771330	3.739567	8.510897	992.016355
1-A-4	04/01/07	04/30/07	A-30/360	76113WAD5	16,556,000.00	1,000.000000	4.791666	0.000000	4.791666	1,000.000000
2-A-1	04/25/07	05/24/07	F-30/360	76113WAE3	176,182,000.00	995.167028	4.668992	3.260801	7.929793	991.906228
2-A-2	04/25/07	05/24/07	F-30/360	76113WAF0	176,182,000.00	995.167028	1.136158	0.000000	1.136158	991.906228
B-1	04/01/07	04/30/07	F-30/360	76113WAJ2	9,511,000.00	999.022890	4.992374	1.888574	6.880948	997.134316
B-2	04/01/07	04/30/07	F-30/360	76113WAL7	4,207,000.00	999.022890	5.200504	1.888574	7.089078	997.134317
B-3	04/01/07	04/30/07	F-30/360	76113WAN3	3,110,000.00	999.022891	5.320138	1.888576	7.208714	997.134315
B-1IO	04/01/07	04/30/07	A-30/360	76113WAK9	9,511,000.00	999.022890	0.327763	0.000000	0.327763	997.134316
B-2IO	04/01/07	04/30/07	A-30/360	76113WAM5	4,207,000.00	999.022890	0.119634	0.000000	0.119634	997.134317
PO		76113WAG8	819,861.00	999.519797	0.000000	10.563205	10.563205	988.956591
B-4	04/01/07	04/30/07	F-30/360	76113WAP8	2,012,000.00	999.022888	5.320139	1.888574	7.208713	997.134314
B-5	04/01/07	04/30/07	F-30/360	76113WAQ6	1,646,000.00	999.022892	5.320140	1.888572	7.208712	997.134320
B-6	04/01/07	04/30/07	F-30/360	76113WAR4	1,463,629.00	999.022894	5.320139	1.888573	7.208712	997.134322
A-R		76113WAH6	100.00	0.000000	0.000000	0.000000	0.000000	0.000000




Page 2 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


Distribution to Date -
									Current


	Original		Unscheduled	Scheduled	Total	Total	Realized	Deferred	Principal

Class	Face Value	Interest	Principal	Principal	Principal	Distribution	Loss	Interest	Balance
(1)	(2)	(3)	(4)	(5)=(3)+(4)	(6)=(2)+(5)	(7)	(8)	(9)=(1)-(5)-(7)+(8)
1-A-1	50,000,000.00	720,256.34	206,806.87	132,542.46	339,349.33	1,059,605.67	0.00	0.00	49,660,650.67
1-A-2	6,521,739.00	91,124.29	26,974.81	17,288.14	44,262.95	135,387.24	0.00	0.00	6,477,476.05
1-A-3	93,816,261.00	1,346,423.85	456,515.11	292,480.64	748,995.75	2,095,419.60	0.00	0.00	93,067,265.25
1-A-4	16,556,000.00	237,992.49	0.00	0.00	0.00	237,992.49	0.00	0.00	16,556,000.00
2-A-1	176,182,000.00	2,475,366.33	887,242.76	538,734.26	1,425,977.02	3,901,343.35	0.00	0.00	174,756,022.98
2-A-2	0.00	623,571.80	0.00	0.00	0.00	623,571.80	0.00	0.00	0.00
B-1	9,511,000.00	142,516.33	0.00	27,255.52	27,255.52	169,771.85	0.00	0.00	9,483,744.48
B-2	4,207,000.00	65,667.32	0.00	12,055.93	12,055.93	77,723.25	0.00	0.00	4,194,944.07
B-3	3,110,000.00	49,660.90	0.00	8,912.28	8,912.28	58,573.18	0.00	0.00	3,101,087.72
B-1IO	0.00	9,356.61	0.00	0.00	0.00	9,356.61	0.00	0.00	0.00
B-2IO	0.00	1,510.63	0.00	0.00	0.00	1,510.63	0.00	0.00	0.00
PO	819,861.00	0.00	8,503.90	550.16	9,054.06	9,054.06	0.00	0.00	810,806.94
B-4	2,012,000.00	32,127.89	0.00	5,765.76	5,765.76	37,893.65	0.00	0.00	2,006,234.24
B-5	1,646,000.00	26,283.56	0.00	4,716.91	4,716.91	31,000.47	0.00	0.00	1,641,283.09
B-6	1,463,629.00	23,371.43	0.00	4,194.29	4,194.29	27,565.72	0.00	0.00	1,459,434.71
A-R	100.00	0.48	0.15	99.85	100.00	100.48	0.00	0.00	0.00


Total	365,845,590.00	5,845,230.25	1,586,043.60	1,044,596.20	2,630,639.80	8,475,870.05	0.00	0.00	363,214,950.20


Interest Detail -
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or	Current
	Pass	Prior Principal		Non-	Prior	Unscheduled		Paid or

	Through	(with Notional)	Accrued	Supported	Unpaid	Interest	Optimal	Deferred	Unpaid

Class	Rate	Balance	Interest	Interest SF	Interest	Adjustment	Interest	Interest	Interest
			(1)	(2)	(3)	(4)	(5)=(1)-(2)+(3)+(4)	(6)	(7)=(5)-(6)
1-A-1	5.77000%	49,819,581.84	239,549.16	0.00	0.00	0.00	239,549.16	239,549.16	0.00
1-A-2	5.59667%	6,498,206.20	30,306.91	0.00	0.00	0.00	30,306.91	30,306.91	0.00
1-A-3	5.75000%	93,418,097.41	447,628.38	0.00	0.00	0.00	447,628.38	447,628.38	0.00
1-A-4	5.75000%	16,556,000.00	79,330.83	0.00	0.00	0.00	79,330.83	79,330.83	0.00
2-A-1	5.63000%	175,330,517.38	822,592.34	0.00	0.00	0.00	822,592.34	822,592.34	0.00
2-A-2	1.37000%	175,330,517.38	200,169.01	0.00	0.00	0.00	200,169.01	200,170.64	0.00
B-1	5.99671%	9,501,706.71	47,482.47	0.00	0.00	0.00	47,482.47	47,482.47	0.00
B-2	6.24671%	4,202,889.30	21,878.52	0.00	0.00	0.00	21,878.52	21,878.52	0.00
B-3	6.39041%	3,106,961.19	16,545.63	0.00	0.00	0.00	16,545.63	16,545.63	0.00
B-1IO	0.39370%	9,501,706.71	3,117.35	0.00	0.00	0.00	3,117.35	3,117.35	0.00
B-2IO	0.14370%	4,202,889.30	503.30	0.00	0.00	0.00	503.30	503.30	0.00
PO	0.00000%	819,467.30	0.00	0.00	0.00	0.00	0.00	0.00	0.00
B-4	6.39041%	2,010,034.05	10,704.12	0.00	0.00	0.00	10,704.12	10,704.12	0.00
B-5	6.39041%	1,644,391.68	8,756.95	0.00	0.00	0.00	8,756.95	8,756.95	0.00
B-6	6.39041%	1,462,198.88	7,786.71	0.00	0.00	0.00	7,786.71	7,786.71	0.00
A-R	0.00000%	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00


Total		553,405,165.33	1,936,351.68	0.00	0.00	0.00	1,936,351.68	1,936,353.31	0.00



Page 3 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Collection Account Report
SUMMARY

	Group 2	Group 1	Total
Principal Collections	975,907.84	179,193.92	1,155,101.76
Principal Withdrawals	0.00	0.00	0.00
Principal Other Accounts	0.00	0.00	0.00
TOTAL NET PRINCIPAL	975,907.84	179,193.92	1,155,101.76
Interest Collections	1,354,163.00	604,952.25	1,959,115.26
Interest Withdrawals	-0.00	-0.00	-0.00
Interest Other Accounts	0.00	0.00	1.63
Interest Fees	-16,318.70	-6,444.89	-22,763.59
TOTAL NET INTEREST	1,337,844.30	598,507.37	1,936,353.30
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION	2,313,752.14	777,701.29	3,091,455.06




PRINCIPAL - COLLECTIONS

	Group 2	Group 1	Total
Scheduled Principal Received	131,847.65	45,251.28	177,098.93
Curtailments	74,258.19	5,930.28	80,188.47
Prepayments In Full	259,290.02	128,012.36	387,302.38
Repurchased/Substitutions	510,511.98	0.00	510,511.98
Liquidations	0.00	0.00	0.00
Insurance Principal	0.00	0.00	0.00
Other Additional Principal	0.00	0.00	0.00
Delinquent Principal	-102,673.99	-34,420.84	-137,094.83
Realized Losses	-0.00	-0.00	-0.00
Advanced Principal	102,673.99	34,420.84	137,094.83
TOTAL PRINCIPAL COLLECTED	975,907.84	179,193.92	1,155,101.76




PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK




PRINCIPAL - OTHER ACCOUNTS

	Group 2	Group 1	Total
TOTAL PRINCIPAL OTHER ACCOUNTS	0.00	0.00	0.00






Page 4 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


INTEREST - COLLECTIONS

	Group 2	Group 1	Total
Scheduled Interest	1,391,887.95	624,067.58	2,015,955.53
Repurchased/Substitution Interest	2,881.27	0.00	2,881.27
Liquidation Interest	0.00	0.00	0.00
Insurance Interest	0.00	0.00	0.00
Other Additional Interest	0.00	0.00	0.00
Prepayment Interest Shortfalls	-0.00	-286.69	-286.69
Delinquent Interest	-1,093,167.88	-495,825.47	-1,588,993.35
Compensating Interest	0.00	286.69	286.69
Civil Relief Act Shortfalls	-0.00	-0.00	-0.00
Interest Advanced	1,052,561.66	476,710.14	1,529,271.80
Interest Realized Loss	0.00	0.00	0.00
TOTAL INTEREST COLLECTED	1,354,163.00	604,952.25	1,959,115.26




INTEREST - WITHDRAWALS

	Group 2	Group 1	Total
TOTAL INTEREST WITHDRAWALS	0.00	0.00	0.00




INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
	Group 2	Group 1	Total
Prepayment Charges Collected. *
Prepayment Charges Waived. *
Prepayment Charges paid by the Servicer	1.63	0.00	1.63

TOTAL INTEREST OTHER ACCOUNTS	0.00	0.00	1.63






* Information not available with Trustee



INTEREST FEES
INTEREST FEES
	Group 2	Group 1	Total
Current Servicing Fees	11,207.29	4,981.59	16,188.89
Trustee Fees	0.00	0.00	0.00
PMI	5,111.41	1,463.29	6,574.71
TOTAL INTEREST FEES	16,318.70	6,444.89	22,763.59



Page 5 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

Credit Enhancement Report

ACCOUNTS

Distribution Account

Beginning Balance

0.00

Ending Balance

3,091,455.06

INSURANCE

SPACE INTENTIONALLY LEFT BLANK

STRUCTURAL FEATURES

SPACE INTENTIONALLY LEFT BLANK

Page 6 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Collateral Report


COLLATERAL




		Group 2	Group 1	Total



Loan Count:


Original	950	410	1,360
Prior	947	410	1,357
Prefunding	0	0	0
Scheduled Paid Offs	-0	-0	-0
Full Voluntary Prepayments	-2	-1	-3
Repurchases	-2	-0	-2
Liquidations	-0	-0	-0
Current	943	409	1,352
Principal Balance:


Original	250,074,942.58	115,770,647.08	365,845,589.66
Prior	248,704,867.26	115,665,184.32	364,370,051.58
Prefunding	0.00	0.00	0.00
Scheduled Principal	-131,847.65	-45,251.28	-177,098.93
Partial Prepayments	-74,258.19	-5,930.28	-80,188.47
Full Voluntary Prepayments	-259,290.02	-128,012.36	-387,302.38
Repurchases	-510,511.98	-0.00	-510,511.98
Liquidations	-0.00	-0.00	-0.00
Current	247,728,959.42	115,485,990.40	363,214,949.82

Aggregate number and outstanding Stated Principal
of Mortgage Loans repurchased during the related
Due Period due to material breaches of
representations and warranties regarding
such Mortgage Loans.*

* Information not available with Trustee





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 7 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution



CHARACTERISTICS
CHARACTERISTICS

	Group 2	Group 1	Total
Weighted Average Coupon Original	6.72986%	6.47461%	6.64909%
Weighted Average Coupon Prior	6.72990%	6.47458%	6.64910%
Weighted Average Coupon Current	6.72976%	6.47456%	6.64875%
Weighted Average Months to Maturity Original	357	357	357
Weighted Average Months to Maturity Prior	356	356	356
Weighted Average Months to Maturity Current	355	355	355
Weighted Avg Remaining Amortization Term Original	367	364	366
Weighted Avg Remaining Amortization Term Prior	366	363	365
Weighted Avg Remaining Amortization Term Current	365	362	364
Weighted Average Seasoning Original	2.00	2.88	2.28
Weighted Average Seasoning Prior	3.00	3.88	3.28
Weighted Average Seasoning Current	3.99	4.88	4.27

Page 8 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution



ARM CHARACTERISTICS
ARM CHARACTERISTICS

	Group 2	Group 1	Total
Weighted Average Margin Original	0.00000%	0.00000%	0.00000%
Weighted Average Margin Prior	0.00000%	0.00000%	0.00000%
Weighted Average Margin Current	0.00000%	0.00000%	0.00000%
Weighted Average Max Rate Original	0.00000%	0.00000%	0.00000%
Weighted Average Max Rate Prior	0.00000%	0.00000%	0.00000%
Weighted Average Max Rate Current	0.00000%	0.00000%	0.00000%
Weighted Average Min Rate Original	0.00000%	0.00000%	0.00000%
Weighted Average Min Rate Prior	0.00000%	0.00000%	0.00000%
Weighted Average Min Rate Current	0.00000%	0.00000%	0.00000%
Weighted Average Cap Up Original	0.00000%	0.00000%	0.00000%
Weighted Average Cap Up Prior	0.00000%	0.00000%	0.00000%
Weighted Average Cap Up Current	0.00000%	0.00000%	0.00000%
Weighted Average Cap Down Original	0.00000%	0.00000%	0.00000%
Weighted Average Cap Down Prior	0.00000%	0.00000%	0.00000%
Weighted Average Cap Down Current	0.00000%	0.00000%	0.00000%





Page 9 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


SERVICING FEES & ADVANCES
SERVICING FEES & ADVANCES

	Group 2	Group 1	Total




Current Servicing Fees	11,207.29	4,981.59	16,188.89
Delinquent Servicing Fees	40,606.22	19,115.31	59,721.53
TOTAL SERVICING FEES	51,813.51	24,096.92	75,910.43


Total Servicing Fees	51,813.51	24,096.92	75,910.43
Compensating Interest	-0.00	-286.69	-286.69
Delinquent Servicing Fees	-40,606.22	-19,115.31	-59,721.53
COLLECTED SERVICING FEES	11,207.29	4,694.90	15,902.19


Total Advanced Interest	1,052,561.66	476,710.14	1,529,271.80
Total Advanced Principal	102,673.99	34,420.84	137,094.83
Aggregate Advances with respect to this Distribution	1,155,235.65	511,130.99	1,666,366.64
	0.00	0.00	0.00

Any additional servicing compensation received by the
Servicer attributable to penalties, fees, Excess Proceeds
or other similar charges or fees and items. *


The aggregate amount of Advances reimbursed
during the related Due Period. *
The general source of funds for such reimbursements. *
The aggregate amount of Advances outstanding as
of the close of business on the Distribution Date. *


The aggregate amount of Servicing Advances
reimbursed during the related Due Period. *
The general source of funds for such reimbursements. *
The aggregate amount of Servicing Advances outstanding
as of the close of business on the Distribution Date. *



* Information not available with Trustee




ADDITIONAL COLLATERAL INFORMATION
ADDITIONAL COLLATERAL INFORMATION
	Group 2	Group 1	Total
Prepayment Interest Shortfall (PPIS)	0.00	286.69	286.69
Compensating Interest	0.00	(286.69)	(286.69)
Net Prepayment Interest Shortfall (PPIS)	0.00	0.00	0.00

Weighted Average Net Mortgage Rate	6.455093%	6.209378%	6.377094%

The number and aggregate balance of any
Delayed Delivery Mortgage Loans not delivered
within the time periods specified in the
definition of Delayed Delivery Mortgage Loans. *

* Information not available with Trustee




Page 10 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Delinquency Report

TOTAL
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		4,942,966.33	530,150.60	99,345.78	5,572,462.71
	% Balance		1.36%	0.15%	0.03%	1.53%
	# Loans		21	2	1	24
	% # Loans		1.55%	0.15%	0.07%	1.78%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	4,942,966.33	530,150.60	99,345.78	5,572,462.71
	% Balance	0.00%	1.36%	0.15%	0.03%	1.53%
	# Loans	0	21	2	1	24
	% # Loans	0.00%	1.55%	0.15%	0.07%	1.78%

Page 11 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


GROUP 1
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		1,039,999.47	127,200.00	0.00	1,167,199.47
	% Balance		0.90%	0.11%	0.00%	1.01%
	# Loans		5	1	0	6
	% # Loans		1.22%	0.24%	0.00%	1.47%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	1,039,999.47	127,200.00	0.00	1,167,199.47
	% Balance	0.00%	0.90%	0.11%	0.00%	1.01%
	# Loans	0	5	1	0	6
	% # Loans	0.00%	1.22%	0.24%	0.00%	1.47%

Page 12 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


GROUP 2
		< 1 PAYMENT	1 PAYMENT	2 PAYMENTS	3+ PAYMENTS	TOTAL
DELINQUENT	Balance		3,902,966.86	402,950.60	99,345.78	4,405,263.24
	% Balance		1.58%	0.16%	0.04%	1.78%
	# Loans		16	1	1	18
	% # Loans		1.70%	0.11%	0.11%	1.91%
FORECLOSURE	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
BANKRUPTCY	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
REO	Balance	0.00	0.00	0.00	0.00	0.00
	% Balance	0.00%	0.00%	0.00%	0.00%	0.00%
	# Loans	0	0	0	0	0
	% # Loans	0.00%	0.00%	0.00%	0.00%	0.00%
TOTAL	Balance	0.00	3,902,966.86	402,950.60	99,345.78	4,405,263.24
	% Balance	0.00%	1.58%	0.16%	0.04%	1.78%
	# Loans	0	16	1	1	18
	% # Loans	0.00%	1.70%	0.11%	0.11%	1.91%

Page 13 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

REO Report

Loan Number

Original

Stated

Current

State &

First

Principal

Paid to

Note

LTV at

Original

Payment

Loan Group

Balance

Date

Rate

Origination

Term

Date

Page 14 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

Foreclosure Report

Loan Number

Original

Stated

Current

State &

First

Principal

Paid to

Note

LTV at

Original

Payment

Loan Group

Balance

Date

Rate

Origination

Term

Date

Page 15 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Prepayment Report

VOLUNTARY PREPAYMENTS



		Group 2	Group 1	Total


Current


Number of Paid in Full Loans	2	1	3
Number of Repurchased Loans	2	0	2
Total Number of Loans Prepaid in Full	4	1	5
Curtailments Amount	74,258.19	5,930.28	80,188.47
Paid in Full Balance	259,290.02	128,012.36	387,302.38
Repurchased Loans Balance	510,511.98	0.00	510,511.98
Total Prepayment Amount	844,060.19	133,942.64	978,002.83
Cumulative


Number of Paid in Full Loans	5	1	6
Number of Repurchased Loans	2	0	2
Total Number of Loans Prepaid in Full	7	1	8
Paid in Full Balance	1,329,161.31	128,012.36	1,457,173.67
Repurchased Loans Balance	510,511.98	0.00	510,511.98
Curtailments Amount	110,911.41	17,958.51	128,869.92
Total Prepayment Amount	1,950,584.70	145,970.87	2,096,555.57

Page 16 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


VOLUNTARY PREPAYMENTS RATES - Including Liquidated Balances



		Group 2	Group 1	Total





SMM	0.34%	0.12%	0.27%
3 Months Avg SMM	0.26%	0.04%	0.19%
12 Months Avg SMM	0.26%	0.04%	0.19%
Avg SMM Since Cut-off	0.26%	0.04%	0.19%



CPR	4.00%	1.38%	3.18%
3 Months Avg CPR	3.09%	0.50%	2.28%
12 Months Avg CPR	3.09%	0.50%	2.28%
Avg CPR Since Cut-off	3.09%	0.50%	2.28%



PSA	501.27%	141.58%	371.64%
3 Months Avg PSA Approximation	515.58%	64.96%	347.38%
12 Months Avg PSA Approximation	515.58%	64.96%	347.38%
Avg PSA Since Cut-off Approximation	515.57%	64.96%	347.39%


(*) SMM, CPR, PSA Figures Include Liquidated Balances

Page 17 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

PREPAYMENT CALCULATION METHODOLOGY - Including Liquidated Balances

Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases + Liquidated Balances)/(Beg Principal Balance - Sched Principal)

Conditional Prepayment Rate (CPR): 1-((1-SMM)^12)

PSA Standard Prepayment Model: CPR/(0.20%*min(30,WAS))

Average SMM over period between nth month and mth month (AvgSMMn,m): 1 - [(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/(0.20%*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 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


VOLUNTARY PREPAYMENTS RATES - Excluding Liquidated Balances



		Group 2	Group 1	Total





SMM	0.34%	0.12%	0.27%
3 Months Avg SMM	0.26%	0.04%	0.19%
12 Months Avg SMM	0.26%	0.04%	0.19%
Avg SMM Since Cut-off	0.26%	0.04%	0.19%



CPR	4.00%	1.38%	3.18%
3 Months Avg CPR	3.09%	0.50%	2.28%
12 Months Avg CPR	3.09%	0.50%	2.28%
Avg CPR Since Cut-off	3.09%	0.50%	2.28%



PSA	501.27%	141.58%	371.64%
3 Months Avg PSA Approximation	515.58%	64.96%	347.38%
12 Months Avg PSA Approximation	515.58%	64.96%	347.38%
Avg PSA Since Cut-off Approximation	515.57%	64.96%	347.39%

(*) SMM, CPR, PSA Figures Exclude Liquidated Balances
(*) SMM, CPR, PSA Figures Exclude Liquidated Balances

Page 19 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

PREPAYMENT CALCULATION METHODOLOGY - Excluding Liquidated Balances

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/(0.20%*min(30,WAS))

Average SMM over period between nth month and mth month (AvgSMMn,m): 1 - [(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/(0.20%*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 20 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

Prepayment Detail Report

Prepayment Detail Report - Mortgage Loans Prepaid in Full During Current Distribution

Loan Number

Original

Current

State &

Type Prepayment

First

Loan

Principal

Prepayment

Note

LTV at

Payment

Loan Group

Status

Balance

Amount

Date

Rate

Origination

Original Term

Date

6056595 2

203,758.00

202,707.55

11-May-2007

7.750%

TX - 95.00%

Paid Off - 360

01-Oct-2006

6060129 1

128,025.00

128,012.36

16-Apr-2007

5.625%

MO - 67.03%

Paid Off - 360

01-Dec-2006

6069067 2

56,771.00

56,582.47

04-May-2007

8.125%

MO - 90.00%

Paid Off - 360

01-Dec-2006

6078991 2

208,960.00

208,959.99

30-Apr-2007

6.625%

CO - 80.00%

Repur/Subs - 360

01-Jan-2007

6079396 2

301,552.00

301,551.99

30-Apr-2007

6.875%

CA - 80.00%

Repur/Subs - 360

01-Jan-2007

TOTAL

899,066.00

897,814.36

Page 21 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Realized Loss Report

COLLATERAL REALIZED LOSSES


		Group 2	Group 1	Total


Current





	Subsequent Recoveries		0.00	0.00	0.00

	Number of Loans Liquidated		0	0	0
	Collateral Principal Realized Loss/(Gain) Amount		0.00	0.00	0.00
	Collateral Interest Realized Loss/(Gain) Amount		0.00	0.00	0.00
Net Liquidation Proceeds		0.00	0.00	0.00
Cumulative




	Number of Loans Liquidated		0	0	0

	Collateral Realized Loss/(Gain) Amount		0.00	0.00	0.00
	Net Liquidation Proceeds		0.00	0.00	0.00
Cumulative Subsequent Recoveries		0.00	0.00	0.00



	Special Hazard Loss Coverage Amt				3,643,700.52
	Fraud Loss Coverage Amt				7,427,763.00
	Bankrupt Loss Coverage Amt				128,013.00

	Class B-1 Writedown Amount				0.00
	Class B-2 Writedown Amount				0.00
	Class B-3 Writedown Amount				0.00
	Class B-4 Writedown Amount				0.00
	Class B-5 Writedown Amount				0.00
	Class B-6 Writedown Amount				0.00

Page 22 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution


DEFAULT SPEEDS
DEFAULT SPEEDS
	Group 2	Group 1	Total




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


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


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


Principal Only Loss Severity Approx for Current Period	0.00%	0.00%	0.00%
3 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
12 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
Avg Loss Severity Approximation Since Cut-Off	0.00%	0.00%	0.00%


Principal & Interest Loss Severity Approx for Current Period	0.00%	0.00%	0.00%
3 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
12 Months Avg Loss Severity Approximation	0.00%	0.00%	0.00%
Avg Loss Severity Approximation Since Cut-Off	0.00%	0.00%	0.00%

Page 23 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

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)

Principal Only Loss Severity Approximation for current period:

Sum(Principal Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)

Principal & Interest Loss Severity Approximation for current period:

Sum(Principal & Interest Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)

Average Loss Severity Approximation over period between nth month and mth month:

Sum(Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans for months in the period n,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.

All Realized Losses in excess of Principal Balance are treated as Interest Realized Losses.

Page 24 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

Realized Loss Detail Report

Loan Number

Current

State &

Prior

Realized

Cumulative

Loan

Note

LTV at

Original

Principal

Loss/(Gain)

Realized

Loan Group

Status

Rate

Origination

Term

Balance

Revision

Loss/(Gain)

TOTAL

Page 25 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

Triggers and Adj. Cert. Report

TRIGGER EVENTS

Group 2

Group 1

Total

Has Optional Termination Date Reached ?

Has Sr. Credit Supp. Depletion Date Occured ?

Has Special Haz. Cov. Term Date Occured ?

Has Fraud Loss Coverage Term Date Occured ?

Has BK Loss Cov. Term Date Occured ?

Does an Event of Default Exist?

Senior Stepdown Date has occurred?

Sr.Stepdown Cond Satisfied?(1=Yes or 2=Yes)

1.Delinquency Trigger

Does Delinquency Trigger Event Exist (a > 50% of b)

(a) Rolling Six Month 60+ Delq Balance

0.00

(b) Aggregate Balance of Subordinate Certificates

21,886,728.31

2.Cumulative Loss Trigger

Does a Loss Trigger Event Exist (a > b)

(a) Cumulative Realized Loss

0.00

(b) Cumulative Loss Threshold (i)*(ii)

22,233,177.00

(i) Threshold Percentage

100.0000%

(ii) Cutoff Date Subordinate Principal Balance

22,233,177.00

ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK

Page 26 of 28

IndyMac Residential Asset Securitization Trust 2007-A3

Mortgage Pass-Through Certificates

May 25, 2007 Distribution

ADDITIONAL INFORMATION

Group 2

Group 1

Total

Current Senior Percentage

93.978291%

93.957824%

93.968327%

Current Subordinate Percentage

6.021709%

6.042176%

6.031673%

Senior Prepayment Percentage

100.000000%

Subordinate Prepayment Percentage

0.000000%

Subordinate Pass Through Rate

6.390408%

Current LIBOR Rate

5.320000%

Libor Rate Determination Date

04/23/2007

Next LIBOR Rate

5.320000%

Next Libor Determination Date

05/23/2007

Items with respect to the Distribution Date,and,with

respect to Lender PMI Loans, the interest premium charged

the related borrower for mortgage guaranty insurance*

* Information not available with Trustee

Page 27 of 28

IndyMac Residential Asset Securitization Trust 2007-A3



Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
May 25, 2007 Distribution

Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
	Group 2	Group 1	Total
Current Scheduled Payments	1,523,735.60	669,318.85	2,193,054.46
Current Scheduled Payments 1 Month Prior	1,532,919.63	669,352.27	2,202,271.90
Current Scheduled Payments 2 Month Prior	1,534,838.95	673,091.74	2,207,930.69
Current Scheduled Payments 3 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 4 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 5 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 6 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 7 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 8 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 9 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 10 Month Prior	0.00	0.00	0.00
Current Scheduled Payments 11 Month Prior



Delinquent 60+ Scheduled Payments	3,294.06	742.00	4,036.06
Delinq. 60+ Sched. Pmnts, 1 Month Prior	4,126.53	1,776.67	0.00
Delinq. 60+ Sched. Pmnts, 2 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 3 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 4 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 5 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 6 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 7 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 8 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 9 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 10 Month Prior	0.00	0.00	0.00
Delinq. 60+ Sched. Pmnts, 11 Month Prior





Page 28 of 28

Residential Asset Securitization Trust 2007-A3 10-D