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): ~~July~~August 25, 2005 (Date of earliest event reported) Indymac MBS, Inc. (as Depositor under the Pooling and Servicing Agreement, dated as May 1, 2005, providing for the issuance of Residential Asset Securitization Trust Series 2005-A6CB Mortgage Pass-Through Certificates, Series 2005-F) (Exact name of registrant as specified in charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-119384-24 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 ~~July~~August 25, 2005. 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: ~~Jul~~Aug 2726, 2005 By: /s/ Katherine M. Wannenmacher Katherine M. Wannenmacher Vice President EXHIBIT INDEX DOCUMENT 99.1 Monthly Remittance Statement to the Certificateholders dated as of ~~July~~August 25, 2005.

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

External Parties

Table of Contents

Page

Seller

1. Certificate Payment Report

IndyMac Bank

2. Collection Account Report

3. Credit Enhancement Report

4. Collateral Report

Certificate Insurer(s)

5. Delinquency Report

6. REO Report

7. Foreclosure Report

8. Prepayment Report

9. Prepayment Detail Report

10. Realized Loss Report

11. Realized Loss Detail Report

Servicer(s)

12. Triggers and Adj. Cert. Report

IndyMac Bank

13. Other Related Information

Underwriter(s)

Morgan Stanley

UBS Investment Bank

Total Number of Pages

Dates

Contacts

Cut-Off Date:

May 01, 2005

Jennifer Hermansader

Close Date:

May 27, 2005

Administrator

First Distribution Date:

June 27, 2005

(714) 247-6258

Jennifer.Vandyne@db.com

Address:

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

Distribution Date:

~~July~~August 25, 2005

Factor Information:

(800) 735-7777

Record Date:

~~June~~July 3029, 2005

Main Phone Number:

(714) 247-6000

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

Page 1 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Certificate Payment Report

Current Period Distribution - REMIC II

Prior

Current

Class

Original

Principal

Total

Realized

Deferred

Principal

Class

Type

Cur

Face Value

Balance

Interest

Principal

Distribution

Loss

Interest

Balance

(1)

(2)

(3)

(4)=(2)+(3)

(5)

(6)

(7)=(1)-(3)-(5)+(6)

A-1

123,890,000.00

122,~~974~~059,~~643~~287.5000

~~563~~559,~~633~~438.7840

915,356.50

1,~~478~~474,~~990~~794.2890

0.00

~~122~~121,~~059~~143,~~287~~930.0050

A-2

250,000,000.00

~~248~~246,~~216~~111,~~027~~611.6380

1,~~137~~128,~~656~~011.7955

24,~~104~~932,~~415~~113.8314

36,~~242~~060,~~072~~124.6269

0.00

~~246~~241,~~111~~179,~~611~~498.8066

A-3

52,000,000.00

238,333.33

0.00

238,333.33

0.00

52,000,000.00

A-4

5,000,000.00

54,~~000~~981,~~000~~863.0042

20,~~833~~757.3376

187,~~136~~552.5875

3828,~~969~~310.9151

0.00

4,~~981~~974,~~863~~310.4267

A-5

31,000,000.00

30,~~739~~466,~~529~~782.2461

~~128~~126,~~081~~944.3793

~~272~~551,~~746~~699.6389

~~400~~678,~~828~~644.0082

0.00

3029,~~466~~915,~~782~~082.6172

A-6

5,000,000.00

20,833.33

0.00

20,833.33

0.00

5,000,000.00

A-7

41,000,000.00

40,~~739~~448,~~529~~646.2402

~~203~~202,~~697~~243.6523

~~290~~559,~~883~~252.2264

~~494~~761,~~580~~495.87

0.00

4039,~~448~~889,~~646~~393.0238

A-8

6,096,000.00

6,~~057~~014,~~272~~023.4508

27,~~762~~564.5027

4383,~~249~~151.3732

71110,~~011~~715.8759

0.00

65,~~014~~930,~~023~~871.0876

A-9

6,110,000.00

6,~~064~~019,~~856~~713.5000

27,~~797~~590.2635

45,143.50

72,~~940~~733.7685

0.00

65,~~019~~974,~~713~~569.0050

A-R

SR/RES

100.00

0.00

A-X

SR/NTL

0.00

117,~~780~~147.5198

0.00

117,~~780~~147.5198

0.00

B-1

SUB

11,515,000.00

11,~~490~~480,~~051~~214.2767

52,~~662~~617.7365

914,~~836~~495.6001

6267,~~499~~112.3366

0.00

11,~~480~~465,~~214~~719.6766

B-2

SUB

4,935,000.00

4,~~924~~920,~~307~~092.6900

22,~~569~~550.7442

46,~~215~~212.6915

2628,~~785~~762.4357

0.00

4,~~920~~913,~~092~~879.0085

B-3

SUB

2,742,000.00

2,~~736~~733,~~059~~716.1077

12,~~540~~529.2754

23,~~342~~451.3361

1415,~~882~~981.6015

0.00

2,~~733~~730,~~716~~265.7716

B-4

SUB/NOF

3,016,000.00

3,~~009~~006,~~465~~889.4506

13,~~793~~781.3857

23,~~576~~796.3952

1617,~~369~~578.7709

0.00

3,~~006~~003,~~889~~092.0654

B-5

SUB/NOF

1,919,000.00

1,~~914~~913,~~842~~202.2495

8,~~776~~768.3685

12,~~639~~415.2962

1011,~~415~~184.6547

0.00

1,~~913~~910,~~202~~787.9533

B-6

SUB/NOF

1,645,730.66

1,~~642~~640,~~165~~759.3146

7,~~526~~520.5915

12,~~405~~071.8564

89,~~932~~591.4479

0.00

1,~~640~~638,~~759~~687.4682

NOF

100.00

423,~~613~~514.0515

0.00

423,~~613~~514.0515

0.00

100.00

2,477,398.00

2,~~469~~454,~~470~~746.9903

0.00

1420,~~724~~837.9642

0.00

2,~~454~~433,~~746~~908.0361

Total

548,346,328.66

~~544~~541,~~978~~251,~~320~~647.6187

2,~~608~~610,~~891~~147.9746

37,~~726~~147,~~672~~549.7471

69,~~335~~757,~~564~~697.7117

0.00

~~541~~534,~~251~~104,~~647~~098.8716

Page 2 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-

Orig. Principal

Prior

Current

Period

(with Notional)

Principal

Total

Principal

Class

Starting

Ending

Method

Cusip

Balance

Interest

Principal

Distribution

Balance

(1)

(2)

(3)

(4)=(2)+(3)

(5)

A-1

0607/01/05

0607/30/05

F-30/360

45660LPB9

123,890,000.00

~~992~~985.~~611538~~223077

4.~~549470~~515606

7.388462

11.~~937931~~904067

~~985~~977.~~223077~~834615

A-2

0607/01/05

0607/30/05

F-30/360

45660LPC7

250,000,000.00

~~992~~984.~~864111~~446447

4.~~550627~~512046

819.~~417663~~728453

1224.~~968290~~240499

~~984~~964.~~446447~~717995

A-3

0607/01/05

0607/30/05

F-30/360

45660LPD5

52,000,000.00

1,000.000000

4.583333

0.000000

4.583333

1,000.000000

A-4

0607/01/05

0607/30/05

F-30/360

45660LPE3

5,000,000.00

~~1,000~~996.~~000000~~372684

4.~~166666~~151552

31.~~627316~~510550

75.~~793982~~662102

~~996~~994.~~372684~~862134

A-5

0607/01/05

0607/30/05

F-30/360

45660LPF0

31,000,000.00

~~991~~982.~~597717~~799439

4.~~131657~~094998

817.~~798278~~796771

1221.~~929935~~891768

~~982~~965.~~799439~~002668

A-6

0607/01/05

0607/30/05

F-30/360

45660LPG8

5,000,000.00

1,000.000000

4.166666

0.000000

4.166666

1,000.000000

A-7

0607/01/05

0607/30/05

F-30/360

45660LPH6

41,000,000.00

~~993~~986.~~647055~~552342

4.~~968235~~932762

713.~~094713~~640308

1218.~~062948~~573070

~~986~~972.~~552342~~912034

A-8

0607/01/05

0607/30/05

F-30/360

45660LPJ2

6,096,000.00

~~993~~986.~~647055~~552343

4.~~554216~~521698

713.~~094713~~640308

1118.~~648929~~162006

~~986~~972.~~552343~~912034

A-9

0607/01/05

0607/30/05

F-30/360

45660LPK9

6,110,000.00

~~992~~985.~~611538~~223077

4.~~549470~~515606

7.388462

11.~~937931~~904067

~~985~~977.~~223077~~834615

A-R

0607/01/05

0607/30/05

F-30/360

45660LPN3

100.00

0.000000

A-X

0607/01/05

0607/30/05

A-30/360

45660LPM5

422,157,919.26

~~994~~988.~~029160~~512275

0.~~278996~~277498

0.000000

0.~~278996~~277498

~~988~~973.~~512275~~855383

B-1

0607/01/05

0607/30/05

F-30/360

45660LPP8

11,515,000.00

~~997~~996.~~833371~~979129

4.~~573403~~569488

01.~~854242~~258794

5.~~427645~~828281

~~996~~995.~~979129~~720335

B-2

0607/01/05

0607/30/05

F-30/360

45660LPQ6

4,935,000.00

~~997~~996.~~833372~~979129

4.~~573402~~569487

01.~~854243~~258794

5.~~427645~~828282

~~996~~995.~~979129~~720334

B-3

0607/01/05

0607/30/05

F-30/360

45660LPR4

2,742,000.00

~~997~~996.~~833370~~979128

4.~~573403~~569489

01.~~854241~~258793

5.~~427644~~828282

~~996~~995.~~979128~~720336

B-4

0607/01/05

0607/30/05

F-30/360

45660LPT0

3,016,000.00

~~997~~996.~~833372~~979131

4.~~573402~~569486

01.~~854241~~258793

5.~~427643~~828279

~~996~~995.~~979131~~720338

B-5

0607/01/05

0607/30/05

F-30/360

45660LPU7

1,919,000.00

~~997~~996.~~833372~~979130

4.~~573403~~569489

01.~~854242~~258791

5.~~427645~~828280

~~996~~995.~~979130~~720339

B-6

0607/01/05

0607/30/05

F-30/360

45660LPV5

1,645,730.66

~~997~~996.~~833576~~979336

4.~~573403~~569490

01.~~854241~~258797

5.~~427644~~828287

~~996~~995.~~979336~~720539

0607/01/05

0607/30/05

A-30/360

45660LPS2

100.00

1,000.000000

46235,~~130~~141.500000

0.000000

46235,~~130~~141.500000

1,000.000000

0607/01/05

0607/30/05

A-30/360

45660LPL7

2,477,398.00

~~996~~990.~~800268~~856548

0.000000

58.~~943720~~411010

~~990~~982.~~856548~~445538

Page 3 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Distribution to Date - REMIC II

Current

Original

Unscheduled

Scheduled

Total

Realized

Deferred

Principal

Class

Face Value

Interest

Principal

Distribution

Loss

Interest

Balance

(1)

(2)

(3)

(4)

(5)=(3)+(4)

(6)=(2)+(5)

(7)

(8)

(9)=(1)-(5)-(7)+(8)

A-1

123,890,000.00

1,~~131~~690,~~462~~901.9535

12,~~408~~240,~~794~~561.6710

~~421~~505,~~918~~508.3340

12,~~830~~746,~~713~~069.0050

24,~~962~~436,~~175~~970.9585

0.00

~~122~~121,~~059~~143,~~287~~930.0050

A-2

250,000,000.00

23,~~283~~411,~~490~~501.1267

37,~~027~~509,~~674~~388.5768

~~860~~1,~~713~~311,112.6366

38,~~888~~820,~~388~~501.2034

612,~~171~~232,~~878~~003.3201

0.00

~~246~~241,~~111~~179,~~611~~498.8066

A-3

52,000,000.00

~~476~~714,~~666~~999.6699

0.00

~~476~~714,~~666~~999.6699

0.00

52,000,000.00

A-4

5,000,000.00

4162,~~666~~424.6642

1522,~~962~~825.0003

2,~~174~~864.5830

1825,~~136~~689.5833

5988,~~803~~113.2475

0.00

4,~~981~~974,~~863~~310.4267

A-5

31,000,000.00

~~257~~384,~~248~~192.0497

~~411~~913,~~685~~004.8568

~~121~~171,~~531~~912.5460

~~533~~1,~~217~~084,917.3928

~~790~~1,~~465~~469,110.4325

0.00

3029,~~466~~915,~~782~~082.6172

A-6

5,000,000.00

4162,~~666~~499.6699

0.00

4162,~~666~~499.6699

0.00

5,000,000.00

A-7

41,000,000.00

~~408~~610,~~697~~940.6588

~~427~~935,~~647~~829.8571

~~123~~174,~~706~~776.1290

~~551~~1,~~353~~110,606.9862

~~960~~1,~~051~~721,547.6350

0.00

4039,~~448~~889,~~646~~393.0238

A-8

6,096,000.00

5583,~~702~~266.5077

63139,~~583~~141.9390

1825,~~392~~986.9934

81165,~~976~~128.9224

~~137~~248,~~679~~395.4201

0.00

65,~~014~~930,~~023~~871.0876

A-9

6,110,000.00

5583,~~801~~391.4378

69110,~~478~~499.8687

2024,~~808~~930.1463

90135,~~287~~430.0050

~~146~~218,~~088~~822.4328

0.00

65,~~019~~974,~~713~~569.0050

A-R

100.00

0.48

65.90

34.10

100.00

100.48

0.00

A-X

0.00

~~236~~353,~~598~~746.9189

0.00

~~236~~353,~~598~~746.9189

0.00

B-1

11,515,000.00

~~105~~158,~~439~~057.8146

0.00

3449,~~785~~280.3334

~~140~~207,~~225~~337.1480

0.00

11,~~480~~465,~~214~~719.6766

B-2

4,935,000.00

4567,~~188~~738.4991

0.00

1421,~~908~~120.0015

6088,~~096~~859.4906

0.00

4,~~920~~913,~~092~~879.0085

B-3

2,742,000.00

2537,~~107~~637.7731

0.00

811,~~283~~734.2384

3349,~~391~~372.0015

0.00

2,~~733~~730,~~716~~265.7716

B-4

3,016,000.00

2741,~~616~~398.7128

0.00

912,~~110~~907.9446

3654,~~727~~305.6574

0.00

3,~~006~~003,~~889~~092.0654

B-5

1,919,000.00

1726,~~571~~340.7863

0.00

58,~~797~~212.0567

2334,~~368~~553.8330

0.00

1,~~913~~910,~~202~~787.9533

B-6

1,645,730.66

1522,~~069~~589.5267

0.00

47,~~971~~043.5418

2029,~~041~~632.0685

0.00

1,~~640~~638,~~759~~687.4682

100.00

428,~~613~~127.3045

0.00

428,~~613~~127.3045

0.00

100.00

2,477,398.00

0.00

2040,~~038~~875.4486

2,613.53

2243,~~651~~489.9739

0.00

2,~~454~~433,~~746~~908.0361

Total

548,346,328.66

57,~~229~~839,~~609~~756.4490

511,~~444~~912,~~932~~192.0773

12,~~649~~330,~~749~~038.0510

714,~~094~~242,~~681~~230.1384

1222,~~324~~081,~~290~~987.5774

0.00

~~541~~534,~~251~~104,~~647~~098.8716

Page 4 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Interest Detail - REMIC II

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

Adjustment

Interest

(1)

(2)

(3)

(4)

(5)=(1)-(2)+(3)+(4)

(6)

(7)=(5)-(6)

A-1

5.50000%

122,~~974~~059,~~643~~287.5000

~~563~~559,~~633~~438.7840

0.00

~~563~~559,~~633~~438.7840

0.00

A-2

5.50000%

~~248~~246,~~216~~111,~~027~~611.6380

1,~~137~~128,~~656~~011.7955

0.00

1,~~137~~128,~~656~~011.7955

0.00

A-3

5.50000%

52,000,000.00

238,333.33

0.00

238,333.33

0.00

A-4

5.00000%

54,~~000~~981,~~000~~863.0042

20,~~833~~757.3376

0.00

20,~~833~~757.3376

0.00

A-5

5.00000%

30,~~739~~466,~~529~~782.2461

~~128~~126,~~081~~944.3793

0.00

~~128~~126,~~081~~944.3793

0.00

A-6

5.00000%

5,000,000.00

20,833.33

0.00

20,833.33

0.00

A-7

6.00000%

40,~~739~~448,~~529~~646.2402

~~203~~202,~~697~~243.6523

0.00

~~203~~202,~~697~~243.6523

0.00

A-8

5.50000%

6,~~057~~014,~~272~~023.4508

27,~~762~~564.5027

0.00

27,~~762~~564.5027

0.00

A-9

5.50000%

6,~~064~~019,~~856~~713.5000

27,~~797~~590.2635

0.00

27,~~797~~590.2635

0.00

A-R

0.00000%

0.00

A-X

0.~~33681~~33687%

~~419~~417,~~637~~308,~~281~~285.8328

117,~~780~~147.5198

0.00

117,~~780~~147.5198

0.00

B-1

5.50000%

11,~~490~~480,~~051~~214.2767

52,~~662~~617.7365

0.00

52,~~662~~617.7365

0.00

B-2

5.50000%

4,~~924~~920,~~307~~092.6900

22,~~569~~550.7442

0.00

22,~~569~~550.7442

0.00

B-3

5.50000%

2,~~736~~733,~~059~~716.1077

12,~~540~~529.2754

0.00

12,~~540~~529.2754

0.00

B-4

5.50000%

3,~~009~~006,~~465~~889.4506

13,~~793~~781.3857

0.00

13,~~793~~781.3857

0.00

B-5

5.50000%

1,~~914~~913,~~842~~202.2495

8,~~776~~768.3685

0.00

8,~~776~~768.3685

0.00

B-6

5.50000%

1,~~642~~640,~~165~~759.3146

7,~~526~~520.5915

0.00

7,~~526~~520.5915

0.00

55282,~~356~~169.~~60000~~80000%

100.00

0.00

423,~~613~~514.0515

0.00

0.00000%

2,~~469~~454,~~470~~746.9903

0.00

Total

~~964~~958,~~615~~559,~~602~~933.4415

2,~~604~~586,~~278~~633.9231

0.00

2,~~604~~586,~~278~~633.9231

2,~~608~~610,~~891~~147.9746

0.00

Page 5 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Collection Account Report

SUMMARY

Total

Principal Collections

37,~~726~~147,~~672~~549.7570

Principal Withrawals

0.00

Principal Other Accounts

0.00

TOTAL NET PRINCIPAL

37,~~726~~147,~~672~~549.7570

Interest Collections

2,~~648~~627,~~777~~663.6382

Interest Withdrawals

-0.00

Interest Other Accounts

423,~~613~~514.0515

Interest Fees

-4441,~~498~~030.6850

TOTAL NET INTEREST

2,~~608~~610,~~892~~147.0047

TOTAL AVAILABLE FUNDS FOR DISTRIBUTION

69,~~335~~757,~~564~~697.7517

PRINCIPAL - COLLECTIONS

Total

Scheduled Principal Received

~~467~~464,~~053~~402.7617

Curtailments

78138,~~091~~995.6995

Prepayments In Full

36,~~181~~325,~~527~~654.3056

Repurchased/Substitutions

0218,497.0002

Liquidations

0.00

Insurance Principal

0.00

Other Additional Principal

0.00

Delinquent Principal

-~~329~~343,~~435~~513.3581

Realized Losses

-0.00

Advanced Principal

~~329~~343,~~435~~513.3581

TOTAL PRINCIPAL COLLECTED

37,~~726~~147,~~672~~549.7570

PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK

PRINCIPAL - OTHER ACCOUNTS

Total

TOTAL PRINCIPAL OTHER ACCOUNTS

0.00

Page 6 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

INTEREST - COLLECTIONS

Total

Scheduled Interest

2,~~748~~728,~~653~~819.0769

Repurchased/Substitution Interest

01,183.0053

Liquidation Interest

0.00

Insurance Interest

0.00

Other Additional Interest

0.00

Prepayment Interest Shortfalls

-2,~~625~~479.0680

Delinquent Interest

-1,~~937~~994,~~853~~055.5236

Compensating Interest

2,~~625~~479.0681

Civil Relief Act Shortfalls

-0.00

Interest Advanced

1,~~837~~891,~~978~~715.0897

TOTAL INTEREST COLLECTED

2,~~648~~627,~~777~~663.6382

INTEREST - WITHDRAWALS

Total

TOTAL INTEREST WITHDRAWALS

0.00

INTEREST - OTHER ACCOUNTS

Total

Prepayment Charges

423,~~613~~514.0515

TOTAL INTEREST OTHER ACCOUNTS

423,~~613~~514.0515

INTEREST - FEES

Total

Current Servicing Fees

4138,~~546~~098.72

Trustee Fees

2,~~951~~931.9778

TOTAL INTEREST FEES

4441,~~498~~030.6850

Page 7 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Credit Enhancement Report

ACCOUNTS

SPACE INTENTIONALLY LEFT BLANK

INSURANCE

SPACE INTENTIONALLY LEFT BLANK

STRUCTURAL FEATURES

SPACE INTENTIONALLY LEFT BLANK

Page 8 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Collateral Report

COLLATERAL

Total

Loan Count:

Original

2,758

Prior

2,~~743~~727

Prefunding

Scheduled Paid Offs

-0

Full Voluntary Prepayments

-1632

Repurchases

-01

Liquidations

-0

Current

2,~~727~~694

Principal Balance:

Original

548,346,229.29

Prior

~~544~~541,~~978~~251,~~220~~548.8914

Prefunding

0.00

Scheduled Principal

-~~467~~464,~~053~~402.7617

Partial Prepayments

-78138,~~091~~995.6995

Full Voluntary Prepayments

-36,~~181~~325,~~527~~654.3056

Repurchases

-0218,497.0002

Liquidations

-0.00

Current

~~541~~534,~~251~~103,~~548~~998.1444

PREFUNDING

SPACE INTENTIONALLY LEFT BLANK

Page 9 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

CHARACTERISTICS

Total

Weighted Average Coupon Original

6.05303%

Weighted Average Coupon Prior

6.~~05303~~05232%

Weighted Average Coupon Current

6.~~05232~~05265%

Weighted Average Months to Maturity Original

357

Weighted Average Months to Maturity Prior

~~357~~356

Weighted Average Months to Maturity Current

~~356~~355

Weighted Avg Remaining Amortization Term Original

357

Weighted Avg Remaining Amortization Term Prior

~~357~~356

Weighted Avg Remaining Amortization Term Current

~~356~~355

Weighted Average Seasoning Original

2.24

Weighted Average Seasoning Prior

23.2423

Weighted Average Seasoning Current

34.2322

Page 10 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

ARM CHARACTERISTICS

Total

Weighted Average Margin Original

0.00000%

Weighted Average Margin Prior

0.00000%

Weighted Average Margin Current

0.00000%

Weighted Average Max Rate Original

0.00000%

Weighted Average Max Rate Prior

0.00000%

Weighted Average Max Rate Current

0.00000%

Weighted Average Min Rate Original

0.00000%

Weighted Average Min Rate Prior

0.00000%

Weighted Average Min Rate Current

0.00000%

Weighted Average Cap Up Original

0.00000%

Weighted Average Cap Up Prior

0.00000%

Weighted Average Cap Up Current

0.00000%

Weighted Average Cap Down Original

0.00000%

Weighted Average Cap Down Prior

0.00000%

Weighted Average Cap Down Current

0.00000%

SERVICING FEES & ADVANCES

Total

Current Servicing Fees

4138,~~546~~098.72

Delinquent Servicing Fees

99102,~~875~~339.4439

TOTAL SERVICING FEES

~~141~~140,~~422~~438.1612

Total Servicing Fees

~~141~~140,~~422~~438.1612

Compensating Interest

-2,~~625~~479.0681

Delinquent Servicing Fees

-99102,~~875~~339.4439

COLLECTED SERVICING FEES

3835,~~921~~618.6692

Total Advaced Interest

1,~~837~~891,~~978~~715.0897

Total Advaced Principal

~~329~~343,~~435~~513.3581

Aggregate Advances with respect to this Distribution

2,~~167~~235,~~413~~229.4378

ADDITIONAL COLLATERAL INFORMATION

Total

Prepayment Interest Shortfall (PPIS)

2,~~625~~479.0680

Compensating Interest

-2,~~625~~479.0681

Net Prepayment Interest Shortfall (PPIS)

0.00

Weighted Average Net Mortgage Rate

5.~~734421~~734783%

Page 11 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Delinquency Report

TOTAL

< 1 PAYMENT

1 PAYMENT

2 PAYMENTS

3+ PAYMENTS

TOTAL

DELINQUENT

Balance

~~980~~1,~~801~~430,515.0024

0359,650.00

0.00

~~980~~1,~~801~~790,165.0024

% Balance

0.1827%

0.0007%

0.00%

0.1834%

# Loans

% # Loans

0.1530%

0.0004%

0.00%

0.1533%

FORECLOSURE

Balance

0.00

% Balance

0.00%

# Loans

% # Loans

0.00%

BANKRUPTCY

Balance

364,~~636~~423.3388

0.00

364,~~636~~423.3388

% Balance

0.07%

0.00%

0.07%

# Loans

% # Loans

0.07%

0.00%

0.07%

REO

Balance

0.00

% Balance

0.00%

# Loans

% # Loans

0.00%

TOTAL

Balance

364,~~636~~423.3388

~~980~~1,~~801~~430,515.0024

0359,650.00

0.00

12,~~345~~154,~~437~~589.3312

% Balance

0.07%

0.1827%

0.0007%

0.00%

0.2540%

# Loans

611

% # Loans

0.07%

0.1530%

0.0004%

0.00%

0.2241%

Page 12 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 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

TOTAL

Page 13 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 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

TOTAL

Page 14 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Prepayment Report

VOLUNTARY PREPAYMENTS

Total

Current

Number of Paid in Full Loans

1632

Number of Repurchased Loans

Total Number of Loans Prepaid in Full

1633

Curtailments Amount

78138,~~091~~995.6995

Paid in Full Balance

36,~~181~~325,~~527~~654.3056

Repurchased Loans Balance

0218,497.0002

Total Prepayment Amount

36,~~259~~683,~~618~~147.9953

Cumulative

Number of Paid in Full Loans

2860

Number of Repurchased Loans

Total Number of Loans Prepaid in Full

3164

Paid in Full Balance

511,~~295~~620,~~061~~715.3187

Repurchased Loans Balance

~~712~~930,~~473~~970.1113

Curtailments Amount

~~146~~285,~~718~~713.0196

Total Prepayment Amount

612,~~154~~837,~~252~~399.4396

Page 15 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES

Total

SMM

01.6024%

3 Months Avg SMM

0.5679%

12 Months Avg SMM

0.5679%

Avg SMM Since Cut-off

0.5679%

CPR

613.9586%

3 Months Avg CPR

69.5606%

12 Months Avg CPR

69.5606%

Avg CPR Since Cut-off

69.5606%

PSA

1,~~075~~643.1609%

3 Months Avg PSA Approximation

1,~~198~~402.9967%

12 Months Avg PSA Approximation

1,~~198~~402.9967%

Avg PSA Since Cut-off Approximation

1,~~198~~402.9966%

Page 16 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

PREPAYMENT CALCULATION METHODOLOGY

Single Monthly Mortality (SMM): (Voluntary partial and full prepayments + Repurchases + Liquidations )/(Beg Principal Balance - Sched Principal) Conditional Prepayment Rate (CPR): 1-((1-SMM)^12) PSA Standard Prepayment Model: CPR/(0.002*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) Conditional Prepayment Rate (CPR): 1-((1-SMM)^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) Dates correspond to distribution dates. Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments, liquidations, and repurchases.

Page 17 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 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

120387619 1

125,000.00

124,510.27

20-Jun-2005

6.125%

FL - 38.46%

Paid Off - 360

01-Mar-2005

120377096 1

98,000.00

97,277.64

29-Jul-2005

6.500%

NC - 80.00%

Paid Off - 360

01-Dec-2004

120388375 1

329,750.00

328,279.17

30-Jun-2005

6.625%

AZ - 89.99%

Paid Off - 360

01-Feb-2005

120377097 1

98,000.00

97,277.31

29-Jul-2005

6.500%

NC - 80.00%

Paid Off - 360

01-Dec-2004

120389425 1

60,000.00

59,505.27

28-Jun-2005

5.625%

IN - 44.44%

Paid Off - 360

01-Apr-2005

120377098 1

98,000.00

97,277.64

29-Jul-2005

6.500%

NC - 80.00%

Paid Off - 360

01-Dec-2004

120390810 1

196,300.00

07-Jul-2005

5.875%

AZ - 79.98%

Paid Off - 360

01-May-2005

120377099 1

98,000.00

97,277.31

29-Jul-2005

6.500%

NC - 80.00%

Paid Off - 360

01-Dec-2004

120950680 1

399,000.00

397,714.31

16-Jun-2005

5.625%

HI - 63.33%

Paid Off - 360

01-Apr-2005

120378033 1

45,000.00

44,454.51

05-Aug-2005

6.250%

IN - 60.00%

Paid Off - 360

01-Jan-2005

120978135 1

179,000.00

178,634.11

24-Jun-2005

5.875%

NV - 74.58%

Paid Off - 360

01-May-2005

120386197 1

208,000.00

10-Aug-2005

6.000%

MN - 48.94%

Paid Off - 360

01-Apr-2005

120982618 1

338,000.00

337,292.51

27-Jun-2005

5.750%

AZ - 79.91%

Paid Off - 360

01-May-2005

120387084 1

252,200.00

27-Jul-2005

6.250%

CA - 72.68%

Paid Off - 360

01-Mar-2005

120986465 1

100,000.00

99,790.70

28-Jun-2005

5.750%

CO - 20.00%

Paid Off - 360

01-May-2005

120387353 1

274,500.00

269,242.52

20-Jul-2005

6.500%

MD - 90.00%

Paid Off - 360

01-Dec-2003

121001698 1

198,400.00

197,790.19

17-Jun-2005

5.875%

TN - 80.00%

Paid Off - 360

01-Apr-2005

120387651 1

276,500.00

275,416.79

05-Aug-2005

6.125%

MA - 57.01%

Paid Off - 360

01-Apr-2005

121033734 1

110,000.00

109,769.75

20-Jun-2005

5.750%

AK - 73.33%

Paid Off - 360

01-May-2005

120388389 1

75,200.00

74,806.00

26-Jul-2005

6.750%

TN - 80.00%

Paid Off - 360

01-Feb-2005

121074861 1

166,700.00

166,390.38

14-Jul-2005

6.375%

FL - 40.66%

Paid Off - 360

01-May-2005

120389320 1

168,750.00

167,362.38

21-Jul-2005

6.500%

PA - 75.00%

Paid Off - 240

01-Apr-2005

121129217 1

262,000.00

261,194.71

30-Jun-2005

5.875%

CO - 65.50%

Paid Off - 360

01-Apr-2005

120390347 1

140,250.00

11-Aug-2005

5.875%

IL - 75.81%

Paid Off - 360

01-May-2005

121164590 1

100,000.00

99,907.38

22-Jun-2005

6.375%

FL - 45.45%

Paid Off - 360

01-Jun-2005

120391622 1

148,800.00

01-Aug-2005

6.250%

ID - 79.65%

Paid Off - 360

01-May-2005

121190792 1

222,400.00

221,986.93

06-Jul-2005

6.375%

FL - 94.98%

Paid Off - 360

01-May-2005

120556066 1

200,000.00

199,147.23

12-Aug-2005

6.000%

MI - 89.69%

Paid Off - 360

01-Apr-2005

121260405 1

250,000.00

249,738.99

14-Jul-2005

5.750%

WI - 63.29%

Paid Off - 360

01-May-2005

120664340 1

120,000.00

119,324.25

29-Jul-2005

6.375%

VA - 80.00%

Paid Off - 360

01-Feb-2005

121278320 1

153,000.00

152,722.63

24-Jun-2005

6.500%

ME - 90.00%

Paid Off - 360

01-May-2005

120905609 1

301,340.00

300,369.01

10-Aug-2005

5.625%

MO - 73.50%

Paid Off - 360

01-May-2005

TOTAL

3,189,550.00

3,181,527.30

120916056 1

215,000.00

214,357.63

02-Aug-2005

6.125%

PA - 68.47%

Paid Off - 360

01-May-2005

121009822 1

336,372.00

335,700.61

05-Aug-2005

6.000%

CA - 80.00%

Paid Off - 360

01-Jun-2005

121053876 1

295,000.00

294,114.58

28-Jul-2005

6.000%

CA - 41.84%

Paid Off - 360

01-May-2005

121099693 1

55,200.00

55,097.47

02-Aug-2005

6.375%

FL - 80.00%

Paid Off - 360

01-Jun-2005

121108383 1

78,500.00

78,264.38

03-Aug-2005

6.000%

CO - 42.43%

Paid Off - 360

01-May-2005

121113999 1

359,650.00

358,147.46

05-Aug-2005

5.875%

MA - 76.52%

Paid Off - 360

01-Apr-2005

121128912 1

284,900.00

284,202.00

09-Aug-2005

6.125%

CA - 63.95%

Paid Off - 360

01-Jun-2005

121155163 1

300,000.00

299,033.33

21-Jul-2005

5.625%

CA - 60.00%

Paid Off - 360

01-May-2005

121166908 1

55,000.00

54,868.74

26-Jul-2005

5.750%

VA - 15.73%

Paid Off - 360

01-Jun-2005

121177716 1

387,000.00

386,298.40

26-Jul-2005

6.500%

NY - 68.50%

Paid Off - 360

01-Jun-2005

121184382 1

135,200.00

134,972.17

15-Aug-2005

6.875%

OR - 80.00%

Paid Off - 360

01-Jun-2005

121244665 1

355,000.00

08-Aug-2005

6.125%

CA - 29.86%

Paid Off - 360

01-May-2005

121278241 1

184,000.00

183,222.99

01-Aug-2005

6.125%

CA - 80.00%

Paid Off - 360

01-Apr-2005

121278242 1

248,000.00

247,307.23

28-Jul-2005

6.375%

IL - 80.00%

Paid Off - 360

01-May-2005

121278296 1

99,000.00

98,688.42

18-Jul-2005

5.750%

FL - 75.00%

Paid Off - 360

01-May-2005

121321536 1

359,000.00

357,896.56

02-Aug-2005

5.875%

CA - 77.87%

Paid Off - 360

01-May-2005

120377855 1

220,400.00

218,497.02

18-Jul-2005

6.500%

SC - 80.00%

Repur/Subs - 360

01-Nov-2004

TOTAL

6,569,762.00

6,544,151.58

Page 18 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Realized Loss Report

COLLATERAL REALIZED LOSSES

Total

Current

Number of Loans Liquidated

Collateral Principal Realized Loss/(Gain) Amount

0.00

Collateral Interest Realized Loss/(Gain) Amount

0.00

Net Liquidation Proceeds

0.00

Cumulative

Number of Loans Liquidated

Collateral Realized Loss/(Gain) Amount

0.00

Net Liquidation Proceeds

0.00

Special Hazard Loss Coverage Amt

4,156,239.00

Fraud Loss Coverage Amt

16,450,387.00

Bankrupt Loss Coverage Amt

150,751.00

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 19 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

DEFAULT SPEEDS

Total

MDR

0.00%

3 Months Avg MDR

0.00%

12 Months Avg MDR

0.00%

Avg MDR Since Cut-off

0.00%

CDR

0.00%

3 Months Avg CDR

0.00%

12 Months Avg CDR

0.00%

Avg CDR Since Cut-off

0.00%

SDA

0.00%

3 Months Avg SDA Approximation

0.00%

12 Months Avg SDA Approximation

0.00%

Avg SDA Since Cut-off Approximation

0.00%

Loss Severity Approximation for Current Period

0.00%

3 Months Avg Loss Severity Approximation

0.00%

12 Months Avg Loss Severity Approximation

0.00%

Avg Loss Severity Approximation Since Cut-off

0.00%

Page 20 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 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)

Loss Severity Approximation for current period: sum(Realized Loss Amount)/sum(Beg Principal Balance of Liquidated Loans)

Average Loss Severity Approximation over period between nth month and mth month: Avg(Loss Severityn,m)

Note: Default rates are calculated since deal issue date and include realized gains and additional realized losses and gains from prior periods.

Dates correspond to distribution dates.

Page 21 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 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 22 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Triggers and Adj. Cert. Report

TRIGGER EVENTS

Total

Has Optional Termination Date Reached

Has Sr. Prepay Stepdown Condition Occurred

Has Sr. Credit Supp. Depletion Date Occured

Have all Prepayment Penalties Expired?

Has Special Haz. Cov. Term Date Occured

Has Fraud Loss Coverage Term Date Occured

Has BK Loss Cov. Term Date Occured

ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK

ADDITIONAL INFORMATION

Total

Current Senior Percentage

95.~~259636~~231064%

Next Senior Percentage

91.~~068405~~011111%

Current Subordinate Percentage

4.~~740364~~768936%

Next Subordinate Percentage

8.~~931595~~988889%

Senior Prepayment Percentage

100.000000%

Next Senior Prepayment Percentage

100.000000%

Subordinate Prepayment Percentage

0.000000%

Next Subordinate Prepayment Percentage

0.000000%

Cap Contract Payment

Page 23 of 24

IndyMac Residential Asset Securitization Trust 2005-A6CB

Mortgage Pass-Through Certificates

2005-A6CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Other Related Information

ADDITIONAL INFORMATION

Total

Current Scheduled Payments

3,~~215~~193,~~706~~221.8386

Current Scheduled Payments 1 Month Prior

3,~~235~~215,~~704~~706.9683

Current Scheduled Payments 2 Month Prior

03,235,704.0096

Current Scheduled Payments 3 Month Prior

0.00

Current Scheduled Payments 4 Month Prior

0.00

Current Scheduled Payments 5 Month Prior

0.00

Current Scheduled Payments 6 Month Prior

0.00

Current Scheduled Payments 7 Month Prior

0.00

Current Scheduled Payments 8 Month Prior

0.00

Current Scheduled Payments 9 Month Prior

0.00

Current Scheduled Payments 10 Month Prior

0.00

Current Scheduled Payments 11 Month Prior

0.00

Delinquent 60+ Scheduled Payments

23,~~014~~924.4395

Delinq. 60+ Sched. Pmnts, 1 Month Prior

02,014.0043

Delinq. 60+ Sched. Pmnts, 2 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 3 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 4 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 5 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 6 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 7 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 8 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 9 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 10 Month Prior

0.00

Delinq. 60+ Sched. Pmnts, 11 Month Prior

0.00

Page 24 of 24

Filing Compare · IndyMac MBS, Inc. Residential Asset Securitization Trust 2005-A6CB