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 June 1, 2005, providing for the issuance of Residential Asset Securitization Trust Series 2005-A8CB Mortgage Pass-Through Certificates, Series 2005-H) (Exact name of registrant as specified in charter) DELAWARE (State or Other Jurisdiction of Incorporation) 333-119384-27 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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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)

Bear Stearns & Co.

UBS Securities

Total Number of Pages

Dates

Contacts

Cut-Off Date:

June 01, 2005

Jennifer Hermansader

Close Date:

June 29, 2005

Administrator

First Distribution Date:

July 25, 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

July 22, 2005

August 24, 2005

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

Page 1 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Certificate Payment Report

Current Period Distribution -

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

40,804,000.00

40,~~804~~504,~~000~~581.0049

~~126~~133,~~492~~665.4012

~~299~~518,~~418~~933.5137

~~425~~652,~~910~~598.9149

0.00

4039,~~504~~985,~~581~~648.4912

A-2

SR/NTL

70,804,000.00

0.00

~~105~~90,~~025~~198.9337

0.00

~~105~~90,~~025~~198.9337

0.00

A-3

8,279,000.00

37,945.42

0.00

37,945.42

0.00

8,279,000.00

A-4

11,817,000.00

54,161.25

0.00

54,161.25

0.00

11,817,000.00

A-5

10,100,000.00

46,291.67

0.00

46,291.67

0.00

10,100,000.00

A-6

236,444,299.00

~~236~~235,~~444~~006,~~299~~196.0067

~~985~~979,~~184~~192.5849

12,~~438~~464,~~102~~686.3352

23,~~423~~443,~~286~~879.9101

0.00

~~235~~232,~~006~~541,~~196~~510.6715

A-7

41,725,463.00

41,~~725~~471,~~463~~680.0025

~~122~~129,~~394~~944.6960

~~253~~434,~~782~~944.7566

~~376~~564,~~177~~889.4426

0.00

41,~~471~~036,~~680~~735.2559

A-8

SR/NTL

41,725,463.00

0.00

~~138~~129,~~389~~253.4540

0.00

~~138~~129,~~389~~253.4540

0.00

A-9

10,000,000.00

10,~~000~~044,~~000~~791.0067

0.00

44,~~791~~992.6730

10,~~044~~089,~~791~~783.6797

A-10

25,368,862.00

113,631.36

0.00

113,631.36

0.00

25,368,862.00

A-11

80,047,155.00

8079,~~047~~635,~~155~~381.0065

~~400~~398,~~235~~176.7891

~~411~~713,~~773~~659.3572

~~812~~1,~~009~~111,836.1363

0.00

7978,~~635~~921,~~381~~721.6593

A-12

6,650,000.00

29,786.46

0.00

29,786.46

0.00

6,650,000.00

A-13

30,000,000.00

3029,~~000~~779,~~000~~860.0091

9398,~~000~~273.0054

~~220~~381,~~139~~531.0925

~~313~~479,~~139~~804.0979

0.00

29,~~779~~398,~~860~~329.9166

1,680,895.00

1,~~680~~665,~~895~~619.0063

0.00

15,~~275~~998.3711

0.00

1,~~665~~649,~~619~~621.6352

A-X

SR/NTL

435,589,969.10

0.00

~~116~~115,~~128~~457.8149

0.00

~~116~~115,~~128~~457.8149

0.00

A-R

SR/RES

100.00

~~100~~0.00

0.00

~~100~~0.00

0.00

B-1

SUB

10,006,000.00

109,~~006~~997,~~000~~443.0086

45,~~860~~821.8362

8,~~556~~550.1436

54,~~416~~371.9798

0.00

9,~~997~~988,~~443~~893.8650

B-2

SUB

4,740,000.00

4,~~740~~735,~~000~~946.0082

21,~~725~~706.0042

4,~~053~~050.1844

25,~~778~~756.1886

0.00

4,~~735~~731,~~946~~896.8238

B-3

SUB

2,896,000.00

2,~~896~~893,~~000~~523.0063

13,~~273~~261.3398

2,~~476~~474.3770

15,~~749~~736.7068

0.00

2,~~893~~891,~~523~~048.6393

B-4

SUB/NOF

2,633,000.00

2,~~633~~630,~~000~~748.0052

12,~~067~~057.9260

2,~~251~~249.4896

14,~~319~~307.4056

0.00

2,~~630~~628,~~748~~498.5256

B-5

SUB/NOF

2,106,000.00

2,~~106~~104,~~000~~199.0016

9,~~652~~644.5025

1,~~800~~799.8463

11,~~453~~443.3488

0.00

2,~~104~~102,~~199~~399.1653

B-6

SUB/NOF

1,316,650.71

1,~~316~~315,~~650~~525.7129

6,~~034~~029.6549

1,125.4211

7,~~160~~154.0760

0.00

1,~~315~~314,~~525~~400.2918

NOF

100.00

211,189.0034

0.00

211,189.0034

0.00

100.00

Total

1,074,733,956.81

~~526~~524,~~614~~000,~~524~~461.7155

2,~~477~~475,~~284~~688.0378

24,~~658~~550,~~854~~003.83

57,~~136~~025,~~138~~692.8661

0.00

44,~~791~~992.6730

~~524~~519,~~000~~495,~~461~~450.5502

Page 2 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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

0607/25/05

0708/24/05

F-30/360

45660LSP5

40,804,000.00

~~1,000~~992.~~000000~~662030

3.~~100000~~275785

712.~~337970~~717708

1015.~~437970~~993493

~~992~~979.~~662030~~944322

A-2

0607/25/05

0708/24/05

F-30/360

45660LSQ3

70,804,000.00

~~1,000~~992.~~000000~~662030

1.~~483333~~273916

0.000000

1.~~483333~~273916

~~992~~979.~~662030~~944322

A-3

0607/01/05

0607/30/05

A-30/360

45660LSR1

8,279,000.00

1,000.000000

4.583334

0.000000

4.583334

1,000.000000

A-4

0607/01/05

0607/30/05

A-30/360

45660LSS9

11,817,000.00

1,000.000000

4.583333

0.000000

4.583333

1,000.000000

A-5

0607/01/05

0607/30/05

A-30/360

45660LST7

10,100,000.00

1,000.000000

4.583334

0.000000

4.583334

1,000.000000

A-6

0607/01/05

0607/30/05

A-30/360

45660LSU4

236,444,299.00

~~1,000~~993.~~000000~~917797

4.~~166667~~141324

610.~~082203~~423963

1014.~~248870~~565287

~~993~~983.~~917797~~493834

A-7

0607/25/05

0708/24/05

F-30/360

45660LSV2

41,725,463.00

~~1,000~~993.~~000000~~917797

23.~~933333~~114276

610.~~082203~~423962

913.~~015537~~538238

~~993~~983.~~917797~~493834

A-8

0607/25/05

0708/24/05

F-30/360

45660LSW0

41,725,463.00

~~1,000~~993.~~000000~~917797

3.~~316667~~097710

0.000000

3.~~316667~~097710

~~993~~983.~~917797~~493834

A-9

0607/01/05

0607/30/05

A-30/360

45660LSX8

10,000,000.00

1,~~000~~004.~~000000~~479167

0.000000

1,~~004~~008.~~479167~~978397

A-10

0607/01/05

0607/30/05

A-30/360

45660LSY6

25,368,862.00

1,000.000000

4.479167

0.000000

4.479167

1,000.000000

A-11

0607/01/05

0607/30/05

A-30/360

45660LSZ3

80,047,155.00

~~1,000~~994.~~000000~~855865

54.~~000000~~974279

58.~~144135~~915491

1013.~~144135~~889771

~~994~~985.~~855865~~940374

A-12

0607/01/05

0607/30/05

A-30/360

45660LTA7

6,650,000.00

1,000.000000

4.479167

0.000000

4.479167

1,000.000000

A-13

0607/25/05

0708/24/05

F-30/360

45660LTB5

30,000,000.00

~~1,000~~992.~~000000~~662030

3.~~100000~~275785

712.~~337970~~717708

1015.~~437970~~993493

~~992~~979.~~662030~~944322

0607/25/05

0708/24/05

A-30/360

45660LTC3

1,680,895.00

~~1,000~~990.~~000000~~912359

0.000000

9.~~087641~~517614

~~990~~981.~~912359~~394745

A-X

0607/01/05

0607/30/05

F-30/360

45660LTD1

435,589,969.10

~~1,000~~995.~~000000~~503608

0.~~266601~~265060

0.000000

0.~~266601~~265060

~~995~~986.~~503608~~789923

A-R

0607/01/05

0607/30/05

A-30/360

45660LTE9

100.00

~~1,000~~0.000000

0.000000

~~1,000~~0.000000

0.000000

B-1

0607/01/05

0607/30/05

A-30/360

45660LTF6

10,006,000.00

~~1,000~~999.~~000000~~144899

4.~~583333~~579414

0.~~855101~~854523

5.~~438434~~433938

~~999~~998.~~144899~~290376

B-2

0607/01/05

0607/30/05

A-30/360

45660LTG4

4,740,000.00

~~1,000~~999.~~000000~~144899

4.~~583333~~579414

0.~~855101~~854523

5.~~438435~~433937

~~999~~998.~~144899~~290376

B-3

0607/01/05

0607/30/05

A-30/360

45660LTH2

2,896,000.00

~~1,000~~999.~~000000~~144900

4.~~583332~~579413

0.~~855100~~854523

5.~~438432~~433936

~~999~~998.~~144900~~290376

B-4

0607/01/05

0607/30/05

A-30/360

45660LTK5

2,633,000.00

~~1,000~~999.~~000000~~144899

4.~~583335~~579415

0.~~855101~~854523

5.~~438435~~433938

~~999~~998.~~144899~~290376

B-5

0607/01/05

0607/30/05

A-30/360

45660LTL3

2,106,000.00

~~1,000~~999.~~000000~~144900

4.~~583333~~579416

0.~~855100~~854525

5.~~438433~~433941

~~999~~998.~~144900~~290375

B-6

0607/01/05

0607/30/05

A-30/360

45660LTM1

1,316,650.71

~~1,000~~999.~~000000~~145240

4.~~583334~~579415

0.~~854760~~854524

5.~~438094~~433939

~~999~~998.~~145240~~290716

0607/25/05

0708/24/05

F-30/360

45660LTJ8

100.00

1,000.000000

20111,893.~~000000~~400000

0.000000

20111,893.~~000000~~400000

1,000.000000

Page 3 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Distribution to Date -

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

40,804,000.00

~~126~~260,~~492~~157.4052

~~249~~719,~~648~~057.5721

4999,~~769~~294.9467

~~299~~818,~~418~~351.5188

~~425~~1,~~910~~078,509.9140

0.00

4039,~~504~~985,~~581~~648.4912

A-2

70,804,000.00

~~105~~195,~~025~~224.9330

0.00

~~105~~195,~~025~~224.9330

0.00

A-3

8,279,000.00

3775,~~945~~890.4284

0.00

3775,~~945~~890.4284

0.00

8,279,000.00

A-4

11,817,000.00

54108,~~161~~322.2550

0.00

54108,~~161~~322.2550

0.00

11,817,000.00

A-5

10,100,000.00

4692,~~291~~583.6734

0.00

4692,~~291~~583.6734

0.00

10,100,000.00

A-6

236,444,299.00

~~985~~1,~~184~~964,377.5807

13,~~199~~428,~~058~~525.0972

~~239~~474,~~044~~263.2413

13,~~438~~902,~~102~~788.3385

25,~~423~~867,~~286~~165.9192

0.00

~~235~~232,~~006~~541,~~196~~510.6715

A-7

41,725,463.00

~~122~~252,~~394~~339.6929

~~183~~528,~~547~~666.1371

3673,~~591~~003.9663

~~253~~688,~~782~~727.7541

~~376~~941,~~177~~066.4470

0.00

41,~~471~~036,~~680~~735.2559

A-8

41,725,463.00

~~138~~267,~~389~~642.4585

0.00

~~138~~267,~~389~~642.4585

0.00

A-9

10,000,000.00

0.00

4489,~~791~~783.6797

10,~~044~~089,~~791~~783.6797

A-10

25,368,862.00

~~113~~227,~~631~~262.3672

0.00

~~113~~227,~~631~~262.3672

0.00

25,368,862.00

A-11

80,047,155.00

~~400~~798,~~235~~412.7869

0.00

~~411~~1,~~773~~125,433.3507

~~812~~1,~~009~~923,845.1376

0.00

7978,~~635~~921,~~381~~721.6593

A-12

6,650,000.00

2959,~~786~~572.4692

0.00

2959,~~786~~572.4692

0.00

6,650,000.00

A-13

30,000,000.00

93191,~~000~~273.0054

0.00

~~220~~601,~~139~~670.0934

~~313~~792,~~139~~943.0988

0.00

29,~~779~~398,~~860~~329.9166

1,680,895.00

0.00

1327,~~632~~996.8595

13,~~642~~276.5254

1531,~~275~~273.3748

0.00

1,~~665~~649,~~619~~621.6352

A-X

435,589,969.10

~~116~~231,~~128~~586.8130

0.00

~~116~~231,~~128~~586.8130

0.00

A-R

100.00

0.00

83.38

16.62

100.00

0.00

B-1

10,006,000.00

4591,~~860~~682.8345

0.00

817,~~556~~106.1450

54108,~~416~~788.9795

0.00

9,~~997~~988,~~443~~893.8650

B-2

4,740,000.00

2143,~~725~~431.0042

0.00

48,~~053~~103.1862

2551,~~778~~535.1804

0.00

4,~~735~~731,~~946~~896.8238

B-3

2,896,000.00

1326,~~273~~535.3331

0.00

24,~~476~~951.3707

1531,~~749~~486.7038

0.00

2,~~893~~891,~~523~~048.6393

B-4

2,633,000.00

1224,~~067~~125.9252

0.00

24,~~251~~501.4844

1428,~~319~~626.4096

0.00

2,~~630~~628,~~748~~498.5256

B-5

2,106,000.00

919,~~652~~296.5075

0.00

13,~~800~~600.8447

1122,~~453~~897.3422

0.00

2,~~104~~102,~~199~~399.1653

B-6

1,316,650.71

612,~~034~~064.6514

0.00

12,~~125~~250.4253

714,~~160~~314.0767

0.00

1,~~315~~314,~~525~~400.2918

100.00

211,191.0034

0.00

211,191.0034

0.00

100.00

Total

1,074,733,956.81

24,~~477~~952,~~284~~972.0381

14,~~645~~704,~~970~~329.0297

~~347~~690,~~328~~368.7122

27,~~658~~208,~~854~~858.8366

512,~~136~~161,~~138~~831.8647

0.00

4489,~~791~~783.6797

~~524~~519,~~000~~495,~~461~~450.5502

Page 4 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

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

Adjustment

Interest

(1)

(2)

(3)

(4)

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

(6)

(7)=(5)-(6)

A-1

3.~~72000~~96000%

40,~~804~~504,~~000~~581.0049

~~126~~133,~~492~~665.4012

0.00

~~126~~133,~~492~~665.4012

0.00

A-2

1.~~78000~~54000%

70,~~804~~284,~~000~~442.0040

~~105~~90,~~025~~198.9337

0.00

~~105~~90,~~025~~198.9337

0.00

A-3

5.50000%

8,279,000.00

37,945.42

0.00

37,945.42

0.00

A-4

5.50000%

11,817,000.00

54,161.25

0.00

54,161.25

0.00

A-5

5.50000%

10,100,000.00

46,291.67

0.00

46,291.67

0.00

A-6

5.00000%

~~236~~235,~~444~~006,~~299~~196.0067

~~985~~979,~~184~~192.5849

0.00

~~985~~979,~~184~~192.5849

0.00

A-7

3.~~52000~~76000%

41,~~725~~471,~~463~~680.0025

~~122~~129,~~394~~944.6960

0.00

~~122~~129,~~394~~944.6960

0.00

A-8

3.~~98000~~74000%

41,~~725~~471,~~463~~680.0025

~~138~~129,~~389~~253.4540

0.00

~~138~~129,~~389~~253.4540

0.00

A-9

5.37500%

10,~~000~~044,~~000~~791.0067

44,~~791~~992.6730

0.00

44,~~791~~992.6730

0.00

A-10

5.37500%

25,368,862.00

113,631.36

0.00

113,631.36

0.00

A-11

6.00000%

8079,~~047~~635,~~155~~381.0065

~~400~~398,~~235~~176.7891

0.00

~~400~~398,~~235~~176.7891

0.00

A-12

5.37500%

6,650,000.00

29,786.46

0.00

29,786.46

0.00

A-13

3.~~72000~~96000%

3029,~~000~~779,~~000~~860.0091

9398,~~000~~273.0054

0.00

9398,~~000~~273.0054

0.00

0.00000%

1,~~680~~665,~~895~~619.0063

0.00

A-X

0.~~31992~~31951%

~~435~~433,~~589~~631,~~969~~385.1092

~~116~~115,~~128~~457.8149

0.00

~~116~~115,~~128~~457.8149

0.00

A-R

50.~~52000~~00000%

~~100~~0.00

0.00

B-1

5.50000%

109,~~006~~997,~~000~~443.0086

45,~~860~~821.8362

0.00

45,~~860~~821.8362

0.00

B-2

5.50000%

4,~~740~~735,~~000~~946.0082

21,~~725~~706.0042

0.00

21,~~725~~706.0042

0.00

B-3

5.50000%

2,~~896~~893,~~000~~523.0063

13,~~273~~261.3398

0.00

13,~~273~~261.3398

0.00

B-4

5.50000%

2,~~633~~630,~~000~~748.0052

12,~~067~~057.9260

0.00

12,~~067~~057.9260

0.00

B-5

5.50000%

2,~~106~~104,~~000~~199.0016

9,~~652~~644.5025

0.00

9,~~652~~644.5025

0.00

B-6

5.50000%

1,~~316~~315,~~650~~525.7129

6,~~034~~029.6549

0.00

6,~~034~~029.6549

0.00

24134,272.~~00000~~08000%

100.00

0.00

211,189.0034

0.00

Total

1,~~074~~069,~~733~~387,~~956~~970.8112

2,~~522~~509,~~073~~491.7074

0.00

2,~~522~~509,~~073~~491.7074

2,~~522~~520,~~075~~681.7008

0.00

Page 5 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Collection Account Report

SUMMARY

Total

Principal Collections

24,~~614~~505,~~063~~011.6354

Principal Withrawals

0.00

Principal Other Accounts

0.00

TOTAL NET PRINCIPAL

24,~~614~~505,~~063~~011.6354

Interest Collections

2,~~564~~551,~~941~~886.8735

Interest Withdrawals

-0.00

Interest Other Accounts

211,189.0034

Interest Fees

-42,~~868~~394.1864

TOTAL NET INTEREST

2,~~522~~520,~~075~~681.6905

TOTAL AVAILABLE FUNDS FOR DISTRIBUTION

57,~~136~~025,~~139~~692.3259

PRINCIPAL - COLLECTIONS

Total

Scheduled Principal Received

~~450~~448,~~513~~363.8742

Curtailments

~~419~~50,~~060~~487.6897

Prepayments In Full

14,~~744~~006,~~489~~160.0815

Repurchased/Substitutions

0.00

Liquidations

0.00

Insurance Principal

0.00

Other Additional Principal

0.00

Delinquent Principal

-~~305~~317,~~807~~096.9776

Realized Losses

-0.00

Advanced Principal

~~305~~317,~~807~~096.9776

TOTAL PRINCIPAL COLLECTED

24,~~614~~505,~~063~~011.6354

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

INTEREST - COLLECTIONS

Total

Scheduled Interest

2,~~660~~646,~~039~~784.1922

Repurchased/Substitution Interest

0.00

Liquidation Interest

0.00

Insurance Interest

0.00

Other Additional Interest

0.00

Prepayment Interest Shortfalls

-442,976.6142

Delinquent Interest

-1,~~869~~865,~~208~~258.7536

Compensating Interest

442,976.6141

Civil Relief Act Shortfalls

-0.00

Interest Advanced

1,~~774~~770,~~111~~360.4349

TOTAL INTEREST COLLECTED

2,~~564~~551,~~941~~886.8735

INTEREST - WITHDRAWALS

Total

TOTAL INTEREST WITHDRAWALS

0.00

INTEREST - OTHER ACCOUNTS

Total

Prepayment Charges

211,189.0034

TOTAL INTEREST OTHER ACCOUNTS

211,189.0034

INTEREST - FEES

Total

Current Servicing Fees

4039,~~015~~556.6930

Trustee Fees

2,~~852~~838.4934

TOTAL INTEREST FEES

42,~~868~~394.1864

Page 7 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Collateral Report

COLLATERAL

Total

Loan Count:

Original

2,527

Prior

2,~~527~~519

Prefunding

Scheduled Paid Offs

-0

Full Voluntary Prepayments

-816

Repurchases

-0

Liquidations

-0

Current

2,~~519~~503

Principal Balance:

Original

526,614,425.19

Prior

~~526~~524,~~614~~000,~~425~~361.1956

Prefunding

0.00

Scheduled Principal

-~~450~~448,~~513~~363.8742

Partial Prepayments

-~~419~~50,~~060~~487.6897

Full Voluntary Prepayments

-14,~~744~~006,~~489~~160.0815

Repurchases

-0.00

Liquidations

-0.00

Current

~~524~~519,~~000~~495,~~361~~350.5602

PREFUNDING

SPACE INTENTIONALLY LEFT BLANK

Page 9 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

CHARACTERISTICS

Total

Weighted Average Coupon Original

6.06145%

Weighted Average Coupon Prior

6.06145%

Weighted Average Coupon Current

6.~~06145~~06133%

Weighted Average Months to Maturity Original

357

Weighted Average Months to Maturity Prior

357

Weighted Average Months to Maturity Current

~~357~~356

Weighted Avg Remaining Amortization Term Original

357

Weighted Avg Remaining Amortization Term Prior

357

Weighted Avg Remaining Amortization Term Current

~~357~~356

Weighted Average Seasoning Original

1.96

Weighted Average Seasoning Prior

1.96

Weighted Average Seasoning Current

12.96

Page 10 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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

4039,~~015~~556.6930

Delinquent Servicing Fees

9594,~~097~~897.3287

TOTAL SERVICING FEES

~~135~~134,~~113~~454.0016

Total Servicing Fees

~~135~~134,~~113~~454.0016

Compensating Interest

-442,976.6141

Delinquent Servicing Fees

-9594,~~097~~897.3287

COLLECTED SERVICING FEES

3936,~~971~~579.0889

Total Advaced Interest

1,~~774~~770,~~111~~360.4349

Total Advaced Principal

~~305~~317,~~807~~096.9776

Aggregate Advances with respect to this Distribution

2,~~079~~087,~~919~~457.4126

ADDITIONAL COLLATERAL INFORMATION

Total

Prepayment Interest Shortfall (PPIS)

442,976.6142

Compensating Interest

-442,976.6141

Net Prepayment Interest Shortfall (PPIS)

0.00

Weighted Average Net Mortgage Rate

5.~~747067~~746924%

Current LIBOR Rate

3.460000%

Next LIBOR Rate

0.000000%

Page 11 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Delinquency Report

TOTAL

< 1 PAYMENT

1 PAYMENT

2 PAYMENTS

3+ PAYMENTS

TOTAL

DELINQUENT

Balance

0.00

% Balance

0.00%

# Loans

% # Loans

0.00%

FORECLOSURE

Balance

0.00

% Balance

0.00%

# Loans

% # Loans

0.00%

BANKRUPTCY

Balance

~~161~~160,~~119~~991.7749

0.00

~~161~~160,~~119~~991.7749

% Balance

0.03%

0.00%

0.03%

# Loans

% # Loans

0.04%

0.00%

0.04%

REO

Balance

0.00

% Balance

0.00%

# Loans

% # Loans

0.00%

TOTAL

Balance

~~161~~160,~~119~~991.7749

0.00

~~161~~160,~~119~~991.7749

% Balance

0.03%

0.00%

0.03%

# Loans

% # Loans

0.04%

0.00%

0.04%

Page 12 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Prepayment Report

VOLUNTARY PREPAYMENTS

Total

Current

Number of Paid in Full Loans

816

Number of Repurchased Loans

Total Number of Loans Prepaid in Full

816

Curtailments Amount

~~419~~50,~~060~~487.6897

Paid in Full Balance

14,~~744~~006,~~489~~160.0815

Repurchased Loans Balance

0.00

Total Prepayment Amount

24,~~163~~056,~~549~~648.7612

Cumulative

Number of Paid in Full Loans

824

Number of Repurchased Loans

Total Number of Loans Prepaid in Full

824

Paid in Full Balance

15,~~744~~750,~~489~~649.0823

Repurchased Loans Balance

0.00

Curtailments Amount

~~419~~469,~~060~~548.6865

Total Prepayment Amount

26,~~163~~220,~~549~~197.7688

Page 15 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES

Total

SMM

0.4177%

3 Months Avg SMM

0.4159%

12 Months Avg SMM

0.4159%

Avg SMM Since Cut-off

0.4159%

CPR

48.8291%

3 Months Avg CPR

46.8289%

12 Months Avg CPR

46.8289%

Avg CPR Since Cut-off

46.8289%

PSA

1,~~231~~504.5675%

3 Months Avg PSA Approximation

1,~~231~~400.5554%

12 Months Avg PSA Approximation

1,~~231~~400.5554%

Avg PSA Since Cut-off Approximation

1,~~231~~400.5554%

Page 16 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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

120393421 1

214,100.00

213,702.05

12-Jul-2005

6.375%

IL - 79.99%

Paid Off - 360

01-May-2005

120384476 1

146,950.00

146,278.56

19-Jul-2005

6.500%

IN - 94.99%

Paid Off - 360

01-Mar-2005

120394974 1

292,500.00

291,969.72

13-Jul-2005

6.500%

CA - 90.00%

Paid Off - 360

01-May-2005

120392313 1

135,000.00

134,613.72

09-Aug-2005

6.250%

CO - 48.04%

Paid Off - 360

01-May-2005

120804367 1

135,000.00

134,724.04

05-Jul-2005

5.875%

FL - 56.25%

Paid Off - 360

01-May-2005

120392915 1

200,000.00

199,637.40

18-Jul-2005

6.500%

WA - 63.49%

Paid Off - 360

01-Jun-2005

120852539 1

145,000.00

144,554.32

29-Jun-2005

5.875%

CA - 60.42%

Paid Off - 360

01-Apr-2005

120393488 1

297,000.00

296,461.55

18-Jul-2005

6.500%

FL - 90.00%

Paid Off - 360

01-Jun-2005

120927136 1

295,952.00

295,671.19

08-Jul-2005

6.250%

CA - 75.00%

Paid Off - 360

01-Jun-2005

120395012 1

196,000.00

195,999.99

20-Jul-2005

6.250%

CA - 80.00%

Paid Off - 360

01-Jun-2005

121055747 1

295,000.00

294,367.76

01-Jul-2005

5.625%

CA - 63.44%

Paid Off - 360

01-May-2005

120757822 1

307,645.00

307,087.25

10-Aug-2005

6.500%

NV - 80.00%

Paid Off - 360

01-Jun-2005

121300011 1

97,500.00

01-Jul-2005

6.500%

GA - 72.22%

Paid Off - 360

01-Jul-2005

120930233 1

219,120.00

218,921.91

29-Jul-2005

6.500%

NV - 80.00%

Paid Off - 360

01-Jul-2005

121424275 1

272,000.00

13-Jul-2005

5.625%

OH - 74.52%

Paid Off - 360

01-Jul-2005

121060375 1

335,200.00

334,881.95

27-Jul-2005

6.250%

ID - 80.00%

Paid Off - 360

01-Jul-2005

TOTAL

1,747,052.00

1,744,489.08

121156196 1

318,156.00

317,490.07

10-Aug-2005

5.750%

CA - 43.88%

Paid Off - 360

01-Jun-2005

121264703 1

232,000.00

231,779.87

10-Aug-2005

6.250%

FL - 80.00%

Paid Off - 360

01-Jul-2005

121273033 1

330,000.00

329,671.48

04-Aug-2005

6.000%

CA - 60.00%

Paid Off - 360

01-Jul-2005

121342761 1

320,000.00

319,688.98

05-Aug-2005

6.125%

CA - 74.42%

Paid Off - 360

01-Jul-2005

121363602 1

245,000.00

244,750.21

27-Jul-2005

5.875%

CA - 54.44%

Paid Off - 360

01-Jul-2005

121389761 1

112,410.00

112,303.34

20-Jul-2005

6.250%

FL - 90.00%

Paid Off - 360

01-Jul-2005

121394960 1

320,500.00

319,918.95

03-Aug-2005

6.500%

CA - 79.99%

Paid Off - 360

01-Jun-2005

121477742 1

297,000.00

296,674.92

18-Jul-2005

5.500%

NY - 59.40%

Paid Off - 360

01-Jul-2005

TOTAL

4,011,981.00

4,006,160.15

Page 18 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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

54,~~266~~156,~~144~~239.00

Fraud Loss Coverage Amt

5,266,144.00

Bankrupt Loss Coverage Amt

146,077.00

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

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.~~485591~~467010%

Next Senior Percentage

95.~~467009~~431625%

Current Subordinate Percentage

4.~~514409~~532990%

Next Subordinate Percentage

4.~~532991~~568375%

Senior Prepayment Percentage

100.000000%

Next Senior Prepayment Percentage

100.000000%

Subordinate Prepayment Percentage

0.000000%

Next Subordinate Prepayment Percentage

0.000000%

CAPPMT-FXNEC7136

Page 23 of 24

IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates

2005-A8CB

July 25, 2005 Distribution

August 25, 2005 Distribution

Other Related Information

ADDITIONAL INFORMATION

Total

Current Scheduled Payments

3,~~110~~095,~~553~~147.0664

Current Scheduled Payments 1 Month Prior

03,110,553.0006

Current Scheduled Payments 2 Month Prior

0.00

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

1,101.71

Delinq. 60+ Sched. Pmnts, 1 Month Prior

01,101.0071

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

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Filing Compare · Residential Asset Securitization Trust 2005-A8CB