
                                       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):  October 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
     October 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:  Oct 28, 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 October 25, 2005.



IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

				External Parties						Table of Contents

													Page
				Seller									Page
				Seller						1. Certificate Payment Report					2
				IndyMac Bank						1. Certificate Payment Report					2
				IndyMac Bank						2. Collection Account Report					6
										2. Collection Account Report					6
										3. Credit Enhancement Report					8
										4. Collateral Report					9
				Certificate Insurer(s)						5. Delinquency Report					12
				Certificate Insurer(s)						5. Delinquency Report					12
										6. REO Report					13

										7. Foreclosure Report					14
										8. Prepayment Report					15
										9. Prepayment Detail Report					18
										9. Prepayment Detail Report					18
										10. Realized Loss Report					19
										11. Realized Loss Detail Report					22
				Servicer(s)						11. Realized Loss Detail Report					22
				Servicer(s)						12. Triggers and Adj. Cert. Report					23
				IndyMac Bank						12. Triggers and Adj. Cert. Report					23
				IndyMac Bank						13. Other Related Information					24
										13. Other Related Information					24


				Underwriter(s)
				Bear Stearns & Co.
				UBS Securities


										Total Number of Pages					24
										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
										Jennifer.Vandyne@db.com
										Address:
										1761 East St. Andrew Place, Santa Ana, CA 92705
				Distribution Date:			October 25, 2005
										Factor Information:			(800) 735-7777
				Record Date:			September 30, 2005			Factor Information:			(800) 735-7777
										Main Phone Number:			(714) 247-6000

							October 24, 2005
							October 24, 2005

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






Page 1 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Certificate Payment Report
Current Period Distribution -
					Prior												Current
	Class		Original		Principal						Total		Realized		Deferred		Principal
	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	SR	$	40,804,000.00		39,398,553.29		142,163.11		701,117.82		843,280.93		0.00		0.00		38,697,435.47
A-1	SR	$	40,804,000.00		39,398,553.29		142,163.11		701,117.82		843,280.93		0.00		0.00		38,697,435.47
A-2	SR/NTL	$	70,804,000.00		0.00		66,656.11		0.00		66,656.11		0.00		0.00		0.00
A-3	SR	$	8,279,000.00		8,279,000.00		37,945.42		0.00		37,945.42		0.00		0.00		8,279,000.00
A-4	SR	$	11,817,000.00		11,817,000.00		54,161.25		0.00		54,161.25		0.00		0.00		11,817,000.00
A-5	SR	$	10,100,000.00		10,100,000.00		46,291.67		0.00		46,291.67		0.00		0.00		10,100,000.00
A-6	SR	$	236,444,299.00		229,757,941.10		957,324.75		3,316,893.00		4,274,217.75		0.00		0.00		226,441,048.10
A-7	SR	$	41,725,463.00		40,545,517.54		139,544.16		585,334.04		724,878.20		0.00		0.00		39,960,183.50
A-8	SR/NTL	$	41,725,463.00		0.00		113,865.33		0.00		113,865.33		0.00		0.00		0.00
A-9	SR	$	10,000,000.00		10,134,977.79		0.00		0.00		0.00		0.00		45,396.25		10,180,374.04
A-10	SR	$	25,368,862.00		25,368,862.00		113,631.36		0.00		113,631.36		0.00		0.00		25,368,862.00
A-11	SR	$	80,047,155.00		78,114,323.62		390,571.62		964,207.69		1,354,779.31		0.00		0.00		77,150,115.93
A-12	SR	$	6,650,000.00		6,650,000.00		29,786.46		0.00		29,786.46		0.00		0.00		6,650,000.00
A-13	SR	$	30,000,000.00		28,966,684.61		104,521.45		515,477.27		619,998.72		0.00		0.00		28,451,207.34
PO	SR	$	1,680,895.00		1,617,483.53		0.00		10,992.96		10,992.96		0.00		0.00		1,606,490.57
A-X	SR/NTL	$	435,589,969.10		0.00		113,317.48		0.00		113,317.48		0.00		0.00		0.00
A-R	SR/RES	$	100.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-1	SUB	$	10,006,000.00		9,980,315.94		45,743.11		9,427.35		55,170.46		0.00		0.00		9,970,888.59
B-2	SUB	$	4,740,000.00		4,727,833.06		21,669.23		4,465.88		26,135.11		0.00		0.00		4,723,367.18
B-3	SUB	$	2,896,000.00		2,888,566.36		13,239.26		2,728.52		15,967.78		0.00		0.00		2,885,837.84
B-4	SUB/NOF	$	2,633,000.00		2,626,241.44		12,036.94		2,480.73		14,517.67		0.00		0.00		2,623,760.71
B-5	SUB/NOF	$	2,106,000.00		2,100,594.18		9,627.72		1,984.21		11,611.93		0.00		0.00		2,098,609.97
B-6	SUB/NOF	$	1,316,650.71		1,313,271.49		6,019.16		1,240.51		7,259.67		0.00		0.00		1,312,030.97
P	NOF	$	100.00		100.00		18,297.72		0.00		18,297.72		0.00		0.00		100.00


Total			1,074,733,956.81		514,387,265.95		2,436,413.31		6,116,349.98		8,552,763.29		0.00		45,396.25		508,316,312.21
Total





Page 2 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

Interest Accrual Detail Current Period Factor Information per $1,000 of Original Face-
									Orig. Principal		Prior							Current
									Orig. Principal		Prior							Current
	Period		Period						(with Notional)		Principal						Total	Principal
	Period		Period
Class	Starting		Ending		Method		Cusip		Balance		Balance		Interest		Principal		Distribution	Balance

									(1)		(1)		(2)		(3)		(4)=(2)+(3)	(5)
A-1	09/25/05		10/24/05		F-30/360		45660LSP5		40,804,000.00		965.556154		3.484048		17.182576		20.666624	948.373578
A-2	09/25/05		10/24/05		F-30/360		45660LSQ3		70,804,000.00		965.556154		0.941417		0.000000		0.941417	948.373578
A-3	09/01/05		09/30/05		A-30/360		45660LSR1		8,279,000.00		1,000.000000		4.583334		0.000000		4.583334	1,000.000000
A-4	09/01/05		09/30/05		A-30/360		45660LSS9		11,817,000.00		1,000.000000		4.583333		0.000000		4.583333	1,000.000000
A-5	09/01/05		09/30/05		A-30/360		45660LST7		10,100,000.00		1,000.000000		4.583334		0.000000		4.583334	1,000.000000
A-6	09/01/05		09/30/05		A-30/360		45660LSU4		236,444,299.00		971.721213		4.048838		14.028222		18.077060	957.692992
A-7	09/25/05		10/24/05		F-30/360		45660LSV2		41,725,463.00		971.721213		3.344341		14.028222		17.372562	957.692992
A-8	09/25/05		10/24/05		F-30/360		45660LSW0		41,725,463.00		971.721213		2.728917		0.000000		2.728917	957.692992
A-9	09/01/05		09/30/05		A-30/360		45660LSX8		10,000,000.00		1,013.497779		0.000000		0.000000		0.000000	1,018.037404
A-10	09/01/05		09/30/05		A-30/360		45660LSY6		25,368,862.00		1,000.000000		4.479167		0.000000		4.479167	1,000.000000
A-11	09/01/05		09/30/05		A-30/360		45660LSZ3		80,047,155.00		975.853840		4.879269		12.045496		16.924765	963.808344
A-12	09/01/05		09/30/05		A-30/360		45660LTA7		6,650,000.00		1,000.000000		4.479167		0.000000		4.479167	1,000.000000
A-13	09/25/05		10/24/05		F-30/360		45660LTB5		30,000,000.00		965.556154		3.484048		17.182576		20.666624	948.373578
PO	09/25/05		10/24/05		A-30/360		45660LTC3		1,680,895.00		962.275175		0.000000		6.539944		6.539944	955.735230
A-X	09/01/05		09/30/05		F-30/360		45660LTD1		435,589,969.10		977.945430		0.260147		0.000000		0.260147	965.294365
A-R	09/01/05		09/30/05		A-30/360		45660LTE9		100.00		0.000000		0.000000		0.000000		0.000000	0.000000
B-1	09/01/05		09/30/05		A-30/360		45660LTF6		10,006,000.00		997.433134		4.571568		0.942170		5.513738	996.490964
B-2	09/01/05		09/30/05		A-30/360		45660LTG4		4,740,000.00		997.433135		4.571568		0.942169		5.513736	996.490966
B-3	09/01/05		09/30/05		A-30/360		45660LTH2		2,896,000.00		997.433135		4.571568		0.942169		5.513736	996.490967
B-4	09/01/05		09/30/05		A-30/360		45660LTK5		2,633,000.00		997.433133		4.571569		0.942169		5.513737	996.490965
B-5	09/01/05		09/30/05		A-30/360		45660LTL3		2,106,000.00		997.433134		4.571567		0.942170		5.513737	996.490964
B-6	09/01/05		09/30/05		A-30/360		45660LTM1		1,316,650.71		997.433473		4.571569		0.942171		5.513740	996.491294
P	09/25/05		10/24/05		F-30/360		45660LTJ8		100.00		1,000.000000		182,977.200000		0.000000		182,977.200000	1,000.000000




Page 3 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 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)
A-1	40,804,000.00		540,312.77		1,904,337.39		202,227.14		2,106,564.53		2,646,877.30		0.00		0.00		38,697,435.47
A-2	70,804,000.00		340,443.31		0.00		0.00		0.00		340,443.31		0.00		0.00		0.00
A-3	8,279,000.00		151,781.68		0.00		0.00		0.00		151,781.68		0.00		0.00		8,279,000.00
A-4	11,817,000.00		216,645.00		0.00		0.00		0.00		216,645.00		0.00		0.00		11,817,000.00
A-5	10,100,000.00		185,166.68		0.00		0.00		0.00		185,166.68		0.00		0.00		10,100,000.00
A-6	236,444,299.00		3,890,624.78		9,041,515.96		961,734.94		10,003,250.90		13,893,875.68		0.00		0.00		226,441,048.10
A-7	41,725,463.00		526,663.48		1,400,110.81		148,681.85		1,765,279.50		2,291,942.98		0.00		0.00		39,960,183.50
A-8	41,725,463.00		503,207.75		0.00		0.00		0.00		503,207.75		0.00		0.00		0.00
A-9	10,000,000.00		0.00		0.00		0.00		0.00		0.00		0.00		180,374.04		10,180,374.04
A-10	25,368,862.00		454,525.44		0.00		0.00		0.00		454,525.44		0.00		0.00		25,368,862.00
A-11	80,047,155.00		1,583,592.92		0.00		0.00		2,897,039.07		4,480,631.99		0.00		0.00		77,150,115.93
A-12	6,650,000.00		119,145.84		0.00		0.00		0.00		119,145.84		0.00		0.00		6,650,000.00
A-13	30,000,000.00		397,249.85		0.00		0.00		1,548,792.66		1,946,042.51		0.00		0.00		28,451,207.34
PO	1,680,895.00		0.00		69,519.24		4,885.19		74,404.43		74,404.43		0.00		0.00		1,606,490.57
A-X	435,589,969.10		458,948.56		0.00		0.00		0.00		458,948.56		0.00		0.00		0.00
A-R	100.00		0.00		83.38		16.62		100.00		100.00		0.00		0.00		0.00
B-1	10,006,000.00		183,207.99		0.00		35,111.41		35,111.41		218,319.40		0.00		0.00		9,970,888.59
B-2	4,740,000.00		86,788.51		0.00		16,632.82		16,632.82		103,421.33		0.00		0.00		4,723,367.18
B-3	2,896,000.00		53,025.21		0.00		10,162.16		10,162.16		63,187.37		0.00		0.00		2,885,837.84
B-4	2,633,000.00		48,209.75		0.00		9,239.29		9,239.29		57,449.04		0.00		0.00		2,623,760.71
B-5	2,106,000.00		38,560.47		0.00		7,390.03		7,390.03		45,950.50		0.00		0.00		2,098,609.97
B-6	1,316,650.71		24,107.63		0.00		4,619.73		4,619.73		28,727.36		0.00		0.00		1,312,030.97
P	100.00		48,846.84		0.00		0.00		0.00		48,846.84		0.00		0.00		100.00


Total	1,074,733,956.81		9,851,054.46		12,415,566.78		1,400,701.18		18,478,586.53		28,329,640.99		0.00		180,374.04		508,316,312.21



Page 4 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

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)
A-1	4.33000%		39,398,553.29		142,163.11		0.00		0.00		0.00		142,163.11		142,163.11		0.00
A-2	1.17000%		68,365,237.90		66,656.11		0.00		0.00		0.00		66,656.11		66,656.11		0.00
A-3	5.50000%		8,279,000.00		37,945.42		0.00		0.00		0.00		37,945.42		37,945.42		0.00
A-4	5.50000%		11,817,000.00		54,161.25		0.00		0.00		0.00		54,161.25		54,161.25		0.00
A-5	5.50000%		10,100,000.00		46,291.67		0.00		0.00		0.00		46,291.67		46,291.67		0.00
A-6	5.00000%		229,757,941.10		957,324.75		0.00		0.00		0.00		957,324.75		957,324.75		0.00
A-7	4.13000%		40,545,517.54		139,544.16		0.00		0.00		0.00		139,544.16		139,544.16		0.00
A-8	3.37000%		40,545,517.54		113,865.33		0.00		0.00		0.00		113,865.33		113,865.33		0.00
A-9	5.37500%		10,134,977.79		45,396.25		0.00		0.00		0.00		45,396.25		45,396.25		0.00
A-10	5.37500%		25,368,862.00		113,631.36		0.00		0.00		0.00		113,631.36		113,631.36		0.00
A-11	6.00000%		78,114,323.62		390,571.62		0.00		0.00		0.00		390,571.62		390,571.62		0.00
A-12	5.37500%		6,650,000.00		29,786.46		0.00		0.00		0.00		29,786.46		29,786.46		0.00
A-13	4.33000%		28,966,684.61		104,521.45		0.00		0.00		0.00		104,521.45		104,521.45		0.00
PO	0.00000%		1,617,483.53		0.00		0.00		0.00		0.00		0.00		0.00		0.00
A-X	0.31922%		425,983,219.79		113,317.48		0.00		0.00		0.00		113,317.48		113,317.48		0.00
A-R	0.00000%		0.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-1	5.50000%		9,980,315.94		45,743.11		0.00		0.00		0.00		45,743.11		45,743.11		0.00
B-2	5.50000%		4,727,833.06		21,669.23		0.00		0.00		0.00		21,669.23		21,669.23		0.00
B-3	5.50000%		2,888,566.36		13,239.26		0.00		0.00		0.00		13,239.26		13,239.26		0.00
B-4	5.50000%		2,626,241.44		12,036.94		0.00		0.00		0.00		12,036.94		12,036.94		0.00
B-5	5.50000%		2,100,594.18		9,627.72		0.00		0.00		0.00		9,627.72		9,627.72		0.00
B-6	5.50000%		1,313,271.49		6,019.16		0.00		0.00		0.00		6,019.16		6,019.16		0.00
P	219,572.64000%		100.00		0.00		0.00		0.00		0.00		0.00		18,297.72		0.00


Total			1,049,281,241.18		2,463,511.84		0.00		0.00		0.00		2,463,511.84		2,481,809.56		0.00



Page 5 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Collection Account Report
SUMMARY
SUMMARY
														Total
Principal Collections														6,070,953.72
Principal Withrawals														0.00
Principal Other Accounts														0.00
TOTAL NET PRINCIPAL														6,070,953.72
Interest Collections														2,500,814.84
Interest Withdrawals														-0.00
Interest Other Accounts														18,297.72
Interest Fees														-37,302.99
TOTAL NET INTEREST														2,481,809.57
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION														8,552,763.29



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
															Total
Scheduled Principal Received															445,115.36
Curtailments															83,756.75
Prepayments In Full															5,501,231.09
Repurchased/Substitutions															40,850.52
Liquidations															0.00
Insurance Principal															0.00
Other Additional Principal															0.00
Delinquent Principal															-331,559.72
Realized Losses															-0.00
Advanced Principal															331,559.72
TOTAL PRINCIPAL COLLECTED															6,070,953.72


PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK



PRINCIPAL - OTHER ACCOUNTS
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
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
														Total
Scheduled Interest														2,598,082.14
Repurchased/Substitution Interest														221.27
Liquidation Interest														0.00
Insurance Interest														0.00
Other Additional Interest														0.00
Prepayment Interest Shortfalls														-4,134.86
Delinquent Interest														-1,916,686.51
Compensating Interest														4,134.86
Civil Relief Act Shortfalls														-0.00
Interest Advanced														1,819,197.94
TOTAL INTEREST COLLECTED														2,500,814.84


INTEREST - WITHDRAWALS
INTEREST - WITHDRAWALS
														Total
TOTAL INTEREST WITHDRAWALS														0.00



INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
														Total
Prepayment Charges														18,297.72
TOTAL INTEREST OTHER ACCOUNTS														18,297.72



INTEREST - FEES
INTEREST - FEES
														Total
Current Servicing Fees														34,516.72
Trustee Fees														2,786.26
TOTAL INTEREST FEES														37,302.99




Page 7 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 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
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Collateral Report


COLLATERAL



															Total



Loan Count:


Original														2,527
Prior														2,482
Prefunding														0
Scheduled Paid Offs														-0
Full Voluntary Prepayments														-25
Repurchases														-1
Liquidations														-0
Current														2,456
Principal Balance:


Original														526,614,425.19
Prior														514,387,165.95
Prefunding														0.00
Scheduled Principal														-445,115.36
Partial Prepayments														-83,756.75
Full Voluntary Prepayments														-5,501,231.09
Repurchases														-40,850.52
Liquidations														-0.00
Current														508,316,212.23





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 9 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

CHARACTERISTICS
CHARACTERISTICS
														Total
Weighted Average Coupon Original														6.06145%
Weighted Average Coupon Prior														6.06037%
Weighted Average Coupon Current														6.06151%
Weighted Average Months to Maturity Original														357
Weighted Average Months to Maturity Prior														355
Weighted Average Months to Maturity Current														354
Weighted Avg Remaining Amortization Term Original														357
Weighted Avg Remaining Amortization Term Prior														355
Weighted Avg Remaining Amortization Term Current														354
Weighted Average Seasoning Original														1.96
Weighted Average Seasoning Prior														3.96
Weighted Average Seasoning Current														4.96









Page 10 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

ARM CHARACTERISTICS
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														34,516.72
Delinquent Servicing Fees														97,488.56
TOTAL SERVICING FEES														132,005.29


Total Servicing Fees														132,005.29
Compensating Interest														-4,134.86
Delinquent Servicing Fees														-97,488.56
COLLECTED SERVICING FEES														30,381.86


Total Advaced Interest														1,819,197.94
Total Advaced Principal														331,559.72
Aggregate Advances with respect to this Distribution														2,150,757.66





ADDITIONAL COLLATERAL INFORMATION
														Total
Prepayment Interest Shortfall (PPIS)														4,134.86
Compensating Interest														-4,134.86
Net Prepayment Interest Shortfall (PPIS)														0.00

Weighted Average Net Mortgage Rate														5.747061%
Current LIBOR Rate														3.830000%
Next LIBOR Rate														4.037500%




Page 11 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				5,360,523.57		352,660.87		175,786.29		5,888,970.73
			% Balance				1.05%		0.07%		0.03%		1.16%
			# Loans				25		3		1		29
			% # Loans				1.02%		0.12%		0.04%		1.18%
	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		446,811.74		0.00		0.00		0.00		446,811.74
			% Balance		0.09%		0.00%		0.00%		0.00%		0.09%
			# Loans		2		0		0		0		2
			% # Loans		0.08%		0.00%		0.00%		0.00%		0.08%
	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		446,811.74		5,360,523.57		352,660.87		175,786.29		6,335,782.47
			% Balance		0.09%		1.05%		0.07%		0.03%		1.25%
			# Loans		2		25		3		1		31
			% # Loans		0.08%		1.02%		0.12%		0.04%		1.26%









Page 12 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
REO Report
Loan Number			Original		Stated				Current		State &

														First
&			Principal		Principal		Paid to		Note		LTV at		Original		Payment

Loan Group			Balance		Balance		Date		Rate		Origination		Term		Date




TOTAL


Page 13 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Foreclosure Report
Loan Number			Original		Stated				Current		State &

														First
&			Principal		Principal		Paid to		Note		LTV at		Original		Payment

Loan Group			Balance		Balance		Date		Rate		Origination		Term		Date




TOTAL


Page 14 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Prepayment Report

VOLUNTARY PREPAYMENTS
VOLUNTARY PREPAYMENTS

															Total




Current


Number of Paid in Full Loans														25
Number of Repurchased Loans														1
Total Number of Loans Prepaid in Full														26
Curtailments Amount														83,756.75
Paid in Full Balance														5,501,231.09
Repurchased Loans Balance														40,850.52
Total Prepayment Amount														5,625,838.36

Cumulative


Number of Paid in Full Loans														70
Number of Repurchased Loans														1
Total Number of Loans Prepaid in Full														71
Paid in Full Balance														15,743,779.19
Repurchased Loans Balance														40,850.52
Curtailments Amount														723,302.81
Total Prepayment Amount														16,507,932.52










Page 15 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

															Total



SMM														1.09%
3 Months Avg SMM														0.92%
12 Months Avg SMM														0.80%
Avg SMM Since Cut-off														0.80%


CPR														12.37%
3 Months Avg CPR														10.53%
12 Months Avg CPR														9.13%
Avg CPR Since Cut-off														9.13%


PSA														1,247.21%
3 Months Avg PSA Approximation														1,329.24%
12 Months Avg PSA Approximation														1,320.16%
Avg PSA Since Cut-off Approximation														1,320.16%










Page 16 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 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/(0.002min(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
Mortgage Pass-Through Certificates
2005-A8CB

October 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 Number			Original							Current		State &		Type Prepayment

&		Loan	Principal		Prepayment			Prepayment		Note		LTV at		&		Payment

Loan Group		Status	Balance		Amount			Date		Rate		Origination		Original Term		Date

120391619 1			206,000.00		205,999.99			06-Oct-2005		6.625%		NJ - 67.54%		Paid Off - 360		01-Jun-2005
			206,000.00

120391859 1			156,000.00		155,234.13			21-Sep-2005		6.125%		CA - 65.00%		Paid Off - 360		01-May-2005
120391859 1					155,234.13			21-Sep-2005		6.125%		CA - 65.00%		Paid Off - 360		01-May-2005
120393267 1			220,000.00		220,000.00			23-Sep-2005		6.375%		CA - 68.75%		Paid Off - 360		01-Jun-2005
120393267 1					220,000.00			23-Sep-2005		6.375%		CA - 68.75%		Paid Off - 360		01-Jun-2005
120393315 1			236,500.00		236,500.00			22-Sep-2005		6.375%		CA - 49.48%		Paid Off - 360		01-Jun-2005
120393315 1					236,500.00			22-Sep-2005		6.375%		CA - 49.48%		Paid Off - 360		01-Jun-2005
120393423 1			398,000.00		396,513.68			04-Oct-2005		6.375%		MA - 75.81%		Paid Off - 360		01-Jun-2005
120393423 1					396,513.68			04-Oct-2005		6.375%		MA - 75.81%		Paid Off - 360		01-Jun-2005
120393464 1			140,000.00		139,464.46			20-Sep-2005		6.250%		OH - 80.00%		Paid Off - 360		01-Jun-2005
120393464 1					139,464.46			20-Sep-2005		6.250%		OH - 80.00%		Paid Off - 360		01-Jun-2005
120395010 1			162,400.00		162,188.30			30-Sep-2005		6.625%		IL - 80.00%		Paid Off - 360		01-Jun-2005
120395010 1					162,188.30			30-Sep-2005		6.625%		IL - 80.00%		Paid Off - 360		01-Jun-2005
120395020 1			272,000.00		272,000.00			03-Oct-2005		6.250%		OK - 80.00%		Paid Off - 360		01-Jun-2005
120395020 1					272,000.00			03-Oct-2005		6.250%		OK - 80.00%		Paid Off - 360		01-Jun-2005
120395377 1			275,000.00		275,000.00			21-Sep-2005		5.875%		CA - 53.92%		Paid Off - 360		01-Jul-2005
120395377 1					275,000.00			21-Sep-2005		5.875%		CA - 53.92%		Paid Off - 360		01-Jul-2005
120727992 1			102,000.00		101,425.57			14-Oct-2005		6.375%		NC - 85.00%		Paid Off - 360		01-Apr-2005
120727992 1					101,425.57			14-Oct-2005		6.375%		NC - 85.00%		Paid Off - 360		01-Apr-2005
120867762 1			134,500.00		133,960.37			30-Sep-2005		6.000%		HI - 84.06%		Paid Off - 360		01-Jun-2005
120867762 1					133,960.37			30-Sep-2005		6.000%		HI - 84.06%		Paid Off - 360		01-Jun-2005
120964346 1			341,623.00		340,284.64			13-Oct-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Jun-2005
120964346 1					340,284.64			13-Oct-2005		6.125%		CA - 80.00%		Paid Off - 360		01-Jun-2005
120973774 1			250,000.00		249,241.06			26-Sep-2005		6.000%		NY - 49.12%		Paid Off - 360		01-Jul-2005
120973774 1					249,241.06			26-Sep-2005		6.000%		NY - 49.12%		Paid Off - 360		01-Jul-2005
120975174 1			340,000.00		338,570.81			14-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jul-2005
120975174 1					338,570.81			14-Oct-2005		6.000%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121140911 1			262,000.00		260,682.80			21-Sep-2005		6.000%		CA - 79.39%		Paid Off - 360		01-May-2005
121140911 1					260,682.80			21-Sep-2005		6.000%		CA - 79.39%		Paid Off - 360		01-May-2005
121181791 1			308,000.00		306,734.65			04-Oct-2005		5.875%		NJ - 80.00%		Paid Off - 360		01-Jun-2005
121181791 1					306,734.65			04-Oct-2005		5.875%		NJ - 80.00%		Paid Off - 360		01-Jun-2005
121259266 1			191,000.00		190,369.94			26-Sep-2005		5.500%		FL - 74.76%		Paid Off - 360		01-Jul-2005
121259266 1					190,369.94			26-Sep-2005		5.500%		FL - 74.76%		Paid Off - 360		01-Jul-2005
121365698 1			135,200.00		134,831.33			20-Sep-2005		6.500%		WA - 80.00%		Paid Off - 360		01-Jul-2005
121365698 1					134,831.33			20-Sep-2005		6.500%		WA - 80.00%		Paid Off - 360		01-Jul-2005
121372816 1			200,000.00		199,385.27			27-Sep-2005		5.875%		AZ - 46.51%		Paid Off - 360		01-Jul-2005
121372816 1					199,385.27			27-Sep-2005		5.875%		AZ - 46.51%		Paid Off - 360		01-Jul-2005
121394921 1			232,000.00		231,112.55			19-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jun-2005
121394921 1					231,112.55			19-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jun-2005
121394970 1			73,600.00		73,331.69			26-Sep-2005		6.500%		FL - 80.00%		Paid Off - 360		01-Jun-2005
121394970 1					73,331.69			26-Sep-2005		6.500%		FL - 80.00%		Paid Off - 360		01-Jun-2005
121407550 1			277,500.00		276,526.66			27-Sep-2005		5.750%		NC - 44.76%		Paid Off - 360		01-Jul-2005
121407550 1					276,526.66			27-Sep-2005		5.750%		NC - 44.76%		Paid Off - 360		01-Jul-2005
121416846 1			97,000.00		96,701.87			20-Sep-2005		5.875%		FL - 69.78%		Paid Off - 360		01-Jul-2005
121416846 1					96,701.87			20-Sep-2005		5.875%		FL - 69.78%		Paid Off - 360		01-Jul-2005
121443476 1			248,000.00		247,216.60			21-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121443476 1					247,216.60			21-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jul-2005
121515337 1			258,750.00		257,954.72			28-Sep-2005		5.875%		NY - 75.00%		Paid Off - 360		01-Jul-2005
121515337 1					257,954.72			28-Sep-2005		5.875%		NY - 75.00%		Paid Off - 360		01-Jul-2005
120393457 1			41,000.00		40,850.52			23-Sep-2005		6.500%		FL - 35.65%		Repur/Subs - 360		01-Jun-2005
120393457 1					40,850.52			23-Sep-2005		6.500%		FL - 35.65%		Repur/Subs - 360		01-Jun-2005


TOTAL			5,558,073.00		5,542,081.61
TOTAL


Page 18 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Realized Loss Report

COLLATERAL REALIZED LOSSES



															Total


Current
Current



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

Cumulative
Cumulative



Number of Loans Liquidated														0
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														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														0.01









Page 19 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 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
Mortgage Pass-Through Certificates
2005-A8CB

October 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
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Realized Loss Detail Report
Loan Number			Current		State &				Prior		Realized				Cumulative
															Cumulative
&		Loan	Note		LTV at		Original		Principal		Loss/(Gain)		Realized		Realized

Loan Group		Status	Rate		Origination		Term		Balance		Revision		Loss/(Gain)		Loss/(Gain)
Loan Group		Status	Rate		Origination		Term		Balance				Loss/(Gain)		Loss/(Gain)




TOTAL



Page 22 of 24
IndyMac Residential Asset Securitization Trust 2005-A8CB

Mortgage Pass-Through Certificates
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
TRIGGER EVENTS
														Total
						Has Optional Termination Date Reached								No
						Has Sr. Prepay Stepdown Condition Occurred								No
						Has Sr. Credit Supp. Depletion Date Occured								No
						Have all Prepayment Penalties Expired?								No
						Has Special Haz. Cov. Term Date Occured								No
						Has Fraud Loss Coverage Term Date Occured								No
						Has BK Loss Cov. Term Date Occured								No



ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK



ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
														Total
Current Senior Percentage														95.390364%
Next Senior Percentage														95.339640%
Current Subordinate Percentage														4.609636%
Next Subordinate Percentage														4.660360%
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
Mortgage Pass-Through Certificates
2005-A8CB

October 25, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
														Total
Current Scheduled Payments														3,043,197.49
Current Scheduled Payments 1 Month Prior														3,069,900.30
Current Scheduled Payments 2 Month Prior														3,095,147.64
Current Scheduled Payments 3 Month Prior														3,110,553.06
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														6,310.09
Delinq. 60+ Sched. Pmnts, 1 Month Prior														1,101.71
Delinq. 60+ Sched. Pmnts, 2 Month Prior														1,101.71
Delinq. 60+ Sched. Pmnts, 3 Month Prior														1,101.71
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

Residential Asset Securitization Trust 2005-A8CB 8-K