
                                       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 september 1, 2005, providing for the
        issuance of Residential Asset Securitization Trust Series 2005-A13
                Mortgage Pass-Through Certificates, Series 2005-M)
                 (Exact name of registrant as specified in charter)


                                          DELAWARE
                     (State or Other Jurisdiction of Incorporation)

               333-127556-08                         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-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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					15

										7. Foreclosure Report					16
										8. Prepayment Report					17
										9. Prepayment Detail Report					20
										9. Prepayment Detail Report					20
										10. Realized Loss Report					21
										11. Realized Loss Detail Report					24
				Servicer(s)						11. Realized Loss Detail Report					24
				Servicer(s)						12. Triggers and Adj. Cert. Report					25
				IndyMac Bank						12. Triggers and Adj. Cert. Report					25
				IndyMac Bank						13. Other Related Information					26
										13. Other Related Information					26


				Underwriter(s)
				Morgan Stanley
				CS First Boston
				Countrywide Funding Corporation

										Total Number of Pages					26
										Total Number of Pages

				Dates						Contacts

				Cut-Off Date:			September 01, 2005			Jennifer Hermansader
				Close Date:			September 29, 2005			Administrator
				First Distribution Date:			October 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 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Certificate Payment Report
Current Period Distribution - Master REMIC
					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)

1-A-1	SR	$	95,494,000.00		95,494,000.00		360,489.85		23,124.91		383,614.76		0.00		0.00		95,470,875.09
1-A-1	SR	$	95,494,000.00		95,494,000.00		360,489.85		23,124.91		383,614.76		0.00		0.00		95,470,875.09
1-A-2	SR/NTL	$	0.00		0.00		77,190.98		0.00		77,190.98		0.00		0.00		0.00
1-A-3	SR	$	30,315,000.00		30,315,000.00		108,628.75		7,341.11		115,969.86		0.00		0.00		30,307,658.89
1-A-4	SR/NTL	$	0.00		0.00		30,315.00		0.00		30,315.00		0.00		0.00		0.00
1-A-5	SR	$	1,183,000.00		1,183,000.00		5,422.08		286.48		5,708.56		0.00		0.00		1,182,713.52
1-A-6	SR	$	5,914,000.00		5,914,000.00		27,105.83		0.00		27,105.83		0.00		0.00		5,914,000.00
1-A-7	SR	$	15,292,000.00		15,292,000.00		70,088.33		0.00		70,088.33		0.00		0.00		15,292,000.00
1-A-8	SR	$	621,000.00		621,000.00		2,846.25		0.00		2,846.25		0.00		0.00		621,000.00
2-A-1	SR	$	137,342,000.00		137,342,000.00		629,484.17		1,568,099.71		2,197,583.88		0.00		0.00		135,773,900.29
2-A-2	SR	$	5,574,000.00		5,574,000.00		25,547.50		63,641.05		89,188.55		0.00		0.00		5,510,358.95
A-R	SR/RES	$	100.00		100.00		0.48		100.00		100.48		0.00		0.00		0.00
PO	SR	$	1,445,638.86		1,445,638.86		0.00		172.83		172.83		0.00		0.00		1,445,466.03
B-1	SUB	$	10,929,000.00		10,929,000.00		50,091.25		52.33		50,143.58		0.00		0.00		10,928,947.67
B-2	SUB	$	2,810,000.00		2,810,000.00		12,879.17		13.45		12,892.62		0.00		0.00		2,809,986.55
B-3	SUB	$	1,873,000.00		1,873,000.00		8,584.58		8.97		8,593.55		0.00		0.00		1,872,991.03
B-4	SUB/NOF	$	1,405,000.00		1,405,000.00		6,439.58		6.73		6,446.31		0.00		0.00		1,404,993.27
B-5	SUB/NOF	$	1,249,000.00		1,249,000.00		5,724.58		5.98		5,730.56		0.00		0.00		1,248,994.02
B-6	SUB/NOF	$	780,922.59		780,922.59		3,579.23		3.74		3,582.97		0.00		0.00		780,918.85
A-X	SR/NTL	$	0.00		0.00		79,694.35		0.00		79,694.35		0.00		0.00		0.00
P	NOF	$	100.00		100.00		0.00		0.00		0.00		0.00		0.00		100.00


Total			312,227,761.45		312,227,761.45		1,504,111.96		1,662,857.29		3,166,969.25		0.00		0.00		310,564,904.16
Total





Page 2 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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)
1-A-1	09/25/05		10/24/05		A-30/360		45660LC98		95,494,000.00		1,000.000000		3.775000		0.242161		4.017161	999.757839
1-A-2	09/25/05		10/24/05		A-30/360		45660LD22		95,494,000.00		1,000.000000		0.808333		0.000000		0.808333	999.757839
1-A-3	09/25/05		10/24/05		A-30/360		45660LD30		30,315,000.00		1,000.000000		3.583333		0.242161		3.825494	999.757839
1-A-4	09/25/05		10/24/05		A-30/360		45660LD48		30,315,000.00		1,000.000000		1.000000		0.000000		1.000000	999.757839
1-A-5	09/01/05		09/30/05		F-30/360		45660LD55		1,183,000.00		1,000.000000		4.583331		0.242164		4.825495	999.757836
1-A-6	09/01/05		09/30/05		F-30/360		45660LD63		5,914,000.00		1,000.000000		4.583333		0.000000		4.583333	1,000.000000
1-A-7	09/01/05		09/30/05		F-30/360		45660LD71		15,292,000.00		1,000.000000		4.583333		0.000000		4.583333	1,000.000000
1-A-8	09/01/05		09/30/05		F-30/360		45660LD89		621,000.00		1,000.000000		4.583333		0.000000		4.583333	1,000.000000
2-A-1	09/01/05		09/30/05		F-30/360		45660LD97		137,342,000.00		1,000.000000		4.583333		11.417481		16.000815	988.582519
2-A-2	09/01/05		09/30/05		F-30/360		45660LE21		5,574,000.00		1,000.000000		4.583333		11.417483		16.000816	988.582517
A-R	09/01/05		09/30/05		F-30/360		45660LE62		100.00		1,000.000000		4.800000		1,000.000000		1,004.800000	0.000000
PO	09/01/05		09/30/05		45660LE39		1,445,638.86		1,000.000000		0.000000		0.119553		0.119553		999.880447
B-1	09/01/05		09/30/05		F-30/360		45660LE70		10,929,000.00		1,000.000000		4.583333		0.004788		4.588122	999.995212
B-2	09/01/05		09/30/05		F-30/360		45660LE88		2,810,000.00		1,000.000000		4.583335		0.004786		4.588121	999.995214
B-3	09/01/05		09/30/05		F-30/360		45660LE96		1,873,000.00		1,000.000000		4.583332		0.004789		4.588121	999.995211
B-4	09/01/05		09/30/05		F-30/360		45660LH36		1,405,000.00		1,000.000000		4.583331		0.004790		4.588121	999.995210
B-5	09/01/05		09/30/05		F-30/360		45660LH44		1,249,000.00		1,000.000000		4.583331		0.004788		4.588118	999.995212
B-6	09/01/05		09/30/05		F-30/360		45660LH51		780,922.59		1,000.000000		4.583335		0.004789		4.588124	999.995211
A-X	09/01/05		09/30/05		A-30/360		45660LE47		245,528,370.00		1,000.000000		0.324583		0.000000		0.324583	993.260778
P	09/01/05		09/30/05		45660LH28		100.00		1,000.000000		0.000000		0.000000		0.000000		1,000.000000




Page 3 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

Distribution to Date - Master REMIC
																	Current


	Original				Unscheduled		Scheduled		Total		Total		Realized		Deferred		Principal

Class	Face Value		Interest		Principal		Principal		Principal		Distribution		Loss		Interest		Balance
	(1)		(2)		(3)		(4)		(5)=(3)+(4)		(6)=(2)+(5)		(7)		(8)		(9)=(1)-(5)-(7)+(8)
1-A-1	95,494,000.00		360,489.85		22,603.97		520.94		23,124.91		383,614.76		0.00		0.00		95,470,875.09
1-A-2	0.00		77,190.98		0.00		0.00		0.00		77,190.98		0.00		0.00		0.00
1-A-3	30,315,000.00		108,628.75		7,175.73		165.38		7,341.11		115,969.86		0.00		0.00		30,307,658.89
1-A-4	0.00		30,315.00		0.00		0.00		0.00		30,315.00		0.00		0.00		0.00
1-A-5	1,183,000.00		5,422.08		280.03		6.45		286.48		5,708.56		0.00		0.00		1,182,713.52
1-A-6	5,914,000.00		27,105.83		0.00		0.00		0.00		27,105.83		0.00		0.00		5,914,000.00
1-A-7	15,292,000.00		70,088.33		0.00		0.00		0.00		70,088.33		0.00		0.00		15,292,000.00
1-A-8	621,000.00		2,846.25		0.00		0.00		0.00		2,846.25		0.00		0.00		621,000.00
2-A-1	137,342,000.00		629,484.17		0.00		0.00		1,568,099.71		2,197,583.88		0.00		0.00		135,773,900.29
2-A-2	5,574,000.00		25,547.50		0.00		0.00		63,641.05		89,188.55		0.00		0.00		5,510,358.95
A-R	100.00		0.48		97.75		2.25		100.00		100.48		0.00		0.00		0.00
PO	1,445,638.86		0.00		0.00		0.00		172.83		172.83		0.00		0.00		1,445,466.03
B-1	10,929,000.00		50,091.25		0.31		52.02		52.33		50,143.58		0.00		0.00		10,928,947.67
B-2	2,810,000.00		12,879.17		0.08		13.37		13.45		12,892.62		0.00		0.00		2,809,986.55
B-3	1,873,000.00		8,584.58		0.05		8.92		8.97		8,593.55		0.00		0.00		1,872,991.03
B-4	1,405,000.00		6,439.58		0.04		6.69		6.73		6,446.31		0.00		0.00		1,404,993.27
B-5	1,249,000.00		5,724.58		0.04		5.94		5.98		5,730.56		0.00		0.00		1,248,994.02
B-6	780,922.59		3,579.23		0.02		3.72		3.74		3,582.97		0.00		0.00		780,918.85
A-X	0.00		79,694.35		0.00		0.00		0.00		79,694.35		0.00		0.00		0.00
P	100.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00		100.00


Total	312,227,761.45		1,504,111.96		30,158.02		785.68		1,662,857.29		3,166,969.25		0.00		0.00		310,564,904.16



Page 4 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

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

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

Class	Rate		Balance		Interest		Interest SF		Interest		Adjustment		Interest		Interest		Interest
					(1)		(2)		(3)		(4)		(5)=(1)-(2)+(3)+(4)		(6)		(7)=(5)-(6)
1-A-1	4.53000%		95,494,000.00		360,489.85		0.00		0.00		0.00		360,489.85		360,489.85		0.00
1-A-2	0.97000%		95,494,000.00		77,190.98		0.00		0.00		0.00		77,190.98		77,190.98		0.00
1-A-3	4.30000%		30,315,000.00		108,628.75		0.00		0.00		0.00		108,628.75		108,628.75		0.00
1-A-4	1.20000%		30,315,000.00		30,315.00		0.00		0.00		0.00		30,315.00		30,315.00		0.00
1-A-5	5.50000%		1,183,000.00		5,422.08		0.00		0.00		0.00		5,422.08		5,422.08		0.00
1-A-6	5.50000%		5,914,000.00		27,105.83		0.00		0.00		0.00		27,105.83		27,105.83		0.00
1-A-7	5.50000%		15,292,000.00		70,088.33		0.00		0.00		0.00		70,088.33		70,088.33		0.00
1-A-8	5.50000%		621,000.00		2,846.25		0.00		0.00		0.00		2,846.25		2,846.25		0.00
2-A-1	5.50000%		137,342,000.00		629,484.17		0.00		0.00		0.00		629,484.17		629,484.17		0.00
2-A-2	5.50000%		5,574,000.00		25,547.50		0.00		0.00		0.00		25,547.50		25,547.50		0.00
A-R	5.76000%		100.00		0.48		0.00		0.00		0.00		0.48		0.48		0.00
PO	0.00000%		1,445,638.86		0.00		0.00		0.00		0.00		0.00		0.00		0.00
B-1	5.50000%		10,929,000.00		50,091.25		0.00		0.00		0.00		50,091.25		50,091.25		0.00
B-2	5.50000%		2,810,000.00		12,879.17		0.00		0.00		0.00		12,879.17		12,879.17		0.00
B-3	5.50000%		1,873,000.00		8,584.58		0.00		0.00		0.00		8,584.58		8,584.58		0.00
B-4	5.50000%		1,405,000.00		6,439.58		0.00		0.00		0.00		6,439.58		6,439.58		0.00
B-5	5.50000%		1,249,000.00		5,724.58		0.00		0.00		0.00		5,724.58		5,724.58		0.00
B-6	5.50000%		780,922.59		3,579.23		0.00		0.00		0.00		3,579.23		3,579.23		0.00
A-X	0.38950%		245,528,370.00		79,694.35		0.00		0.00		0.00		79,694.35		79,694.35		0.00
P	0.00000%		100.00		0.00		0.00		0.00		0.00		0.00		0.00		0.00


Total			683,565,131.45		1,504,111.96		0.00		0.00		0.00		1,504,111.96		1,504,111.96		0.00



Page 5 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Collection Account Report
SUMMARY
SUMMARY
										Group 2		Group 1		Total
Principal Collections										27,203.47		30,962.71		1,662,857.28
Principal Withrawals										0.00		0.00		0.00
Principal Other Accounts										0.00		0.00		0.00
TOTAL NET PRINCIPAL										27,203.47		30,962.71		1,662,857.28
Interest Collections										612,259.31		765,616.68		#######
Interest Withdrawals										-0.00		-0.00		-0.00
Interest Other Accounts										0.00		0.00		0.00
Interest Fees										-6,406.27		-6,759.45		-14,301.70
TOTAL NET INTEREST										605,853.05		758,857.24		1,504,111.96
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION										633,056.52		789,819.95		3,166,969.24



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
											Group 2		Group 1		Total
Scheduled Principal Received											748.96		742.28		1,491.24
Curtailments											313,875.46		30,220.43		344,095.89
Prepayments In Full											1,317,270.15		0.00		1,317,270.15
Repurchased/Substitutions											0.00		0.00		0.00
Liquidations											0.00		0.00		0.00
Insurance Principal											0.00		0.00		0.00
Other Additional Principal											0.00		0.00		0.00
Delinquent Principal											-34.44		-717.00		-751.44
Realized Losses											-0.00		-0.00		-0.00
Advanced Principal											34.44		717.00		751.44
TOTAL PRINCIPAL COLLECTED											27,203.47		30,962.71		1,662,857.28


PRINCIPAL - WITHDRAWALS

SPACE INTENTIONALLY LEFT BLANK



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





Page 6 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
										Group 2		Group 1		Total
Scheduled Interest										785,258.81		800,434.68		1,585,693.49
Repurchased/Substitution Interest										0.00		0.00		0.00
Liquidation Interest										0.00		0.00		0.00
Insurance Interest										0.00		0.00		0.00
Other Additional Interest										0.00		0.00		0.00
Prepayment Interest Shortfalls										-802.87		-0.00		-802.87
Delinquent Interest										-655,351.39		-690,940.44		-1,346,291.83
Compensating Interest										802.87		0.00		802.87
Civil Relief Act Shortfalls										-0.00		-0.00		-0.00
Interest Advanced										622,889.56		656,122.45		1,279,012.01
TOTAL INTEREST COLLECTED										612,259.31		765,616.68		1,518,413.66


INTEREST - WITHDRAWALS
INTEREST - WITHDRAWALS
										Group 2		Group 1		Total
TOTAL INTEREST WITHDRAWALS										0.00		0.00		0.00



INTEREST - OTHER ACCOUNTS
INTEREST - OTHER ACCOUNTS
										Group 2		Group 1		Total
Prepayment Charges														0.00
TOTAL INTEREST OTHER ACCOUNTS										0.00		0.00		0.00



INTEREST - FEES
INTEREST - FEES
										Group 2		Group 1		Total
Current Servicing Fees										6,457.76		5,632.34		12,090.09
Trustee Fees										1,084.50		1,127.11		2,211.61
TOTAL INTEREST FEES										6,406.27		6,759.45		14,301.70




Page 7 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Collateral Report


COLLATERAL



											Group 2		Group 1		Total



Loan Count:


Original										712		317		1,029
Prior										712		317		1,029
Prefunding										0		0		0
Scheduled Paid Offs										-0		-0		-0
Full Voluntary Prepayments										-5		-0		-5
Repurchases										-0		-0		-0
Liquidations										-0		-0		-0
Current										707		317		1,024
Principal Balance:


Original										153,106,096.43		159,121,565.02		312,227,661.45
Prior										153,106,096.43		159,121,565.02		312,227,661.45
Prefunding										0.00		0.00		0.00
Scheduled Principal										-748.96		-742.28		-1,491.24
Partial Prepayments										-313,875.46		-30,220.43		-344,095.89
Full Voluntary Prepayments										-1,317,270.15		-0.00		-1,317,270.15
Repurchases										-0.00		-0.00		-0.00
Liquidations										-0.00		-0.00		-0.00
Current										151,474,201.86		159,090,602.31		310,564,804.17





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 9 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

CHARACTERISTICS
CHARACTERISTICS
										Group 2		Group 1		Total
Weighted Average Coupon Original										6.15462%		6.03640%		6.09437%
Weighted Average Coupon Prior										6.15462%		6.03640%		6.09437%
Weighted Average Coupon Current										6.15462%		6.03640%		6.09437%
Weighted Average Months to Maturity Original										357		357		357
Weighted Average Months to Maturity Prior										357		357		357
Weighted Average Months to Maturity Current										357		357		357
Weighted Avg Remaining Amortization Term Original										357		357		357
Weighted Avg Remaining Amortization Term Prior										357		357		357
Weighted Avg Remaining Amortization Term Current										357		357		357
Weighted Average Seasoning Original										2.72		2.63		2.67
Weighted Average Seasoning Prior										2.72		2.63		2.67
Weighted Average Seasoning Current										2.72		2.63		2.67









Page 10 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

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




SERVICING FEES & ADVANCES

											Group 2		Group 1		Total




Current Servicing Fees										6,457.76		5,632.34		12,090.09
Delinquent Servicing Fees										32,461.83		34,817.99		67,279.82
TOTAL SERVICING FEES										38,919.59		40,450.33		79,369.92


Total Servicing Fees										38,919.59		40,450.33		79,369.92
Compensating Interest										-802.87		-0.00		-802.87
Delinquent Servicing Fees										-32,461.83		-34,817.99		-67,279.82
COLLECTED SERVICING FEES										5,654.89		5,632.34		11,287.23


Total Advaced Interest										622,889.56		656,122.45		1,279,012.01
Total Advaced Principal										34.44		717.00		751.44
Aggregate Advances with respect to this Distribution										1,279,763.43		1,279,763.43		1,279,763.43





ADDITIONAL COLLATERAL INFORMATION
										Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)										802.87		0.00		802.87
Compensating Interest										-802.87		-0.00		-802.87
Net Prepayment Interest Shortfall (PPIS)										0.00		0.00		0.00

Weighted Average Net Mortgage Rate										5.841085%		5.722849%		5.780828%
Current LIBOR Rate														3.830000%
Next LIBOR Rate														4.037500%




Page 11 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				3,125,460.38		0.00		0.00		3,125,460.38
			% Balance				1.01%		0.00%		0.00%		1.01%
			# Loans				13		0		0		13
			% # Loans				1.27%		0.00%		0.00%		1.27%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		0.00		3,125,460.38		0.00		0.00		3,125,460.38
			% Balance		0.00%		1.01%		0.00%		0.00%		1.01%
			# Loans		0		13		0		0		13
			% # Loans		0.00%		1.27%		0.00%		0.00%		1.27%









Page 12 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution


	GROUP 1
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				380,000.00		0.00		0.00		380,000.00
			% Balance				0.24%		0.00%		0.00%		0.24%
			# Loans				1		0		0		1
			% # Loans				0.32%		0.00%		0.00%		0.32%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		0.00		380,000.00		0.00		0.00		380,000.00
			% Balance		0.00%		0.24%		0.00%		0.00%		0.24%
			# Loans		0		1		0		0		1
			% # Loans		0.00%		0.32%		0.00%		0.00%		0.32%










Page 13 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

	GROUP 2
					< 1 PAYMENT		1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance				2,745,460.38		0.00		0.00		2,745,460.38
			% Balance				1.81%		0.00%		0.00%		1.81%
			# Loans				12		0		0		12
			% # Loans				1.70%		0.00%		0.00%		1.70%
	FORECLOSURE		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	BANKRUPTCY		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	REO		Balance		0.00		0.00		0.00		0.00		0.00
			% Balance		0.00%		0.00%		0.00%		0.00%		0.00%
			# Loans		0		0		0		0		0
			% # Loans		0.00%		0.00%		0.00%		0.00%		0.00%
	TOTAL		Balance		0.00		2,745,460.38		0.00		0.00		2,745,460.38
			% Balance		0.00%		1.81%		0.00%		0.00%		1.81%
			# Loans		0		12		0		0		12
			% # Loans		0.00%		1.70%		0.00%		0.00%		1.70%









Page 14 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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 15 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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 16 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Prepayment Report

VOLUNTARY PREPAYMENTS
VOLUNTARY PREPAYMENTS

											Group 2		Group 1		Total




Current


Number of Paid in Full Loans										5		0		5
Number of Repurchased Loans										0		0		0
Total Number of Loans Prepaid in Full										5		0		5
Curtailments Amount										313,875.46		30,220.43		344,095.89
Paid in Full Balance										1,317,270.15		0.00		1,317,270.15
Repurchased Loans Balance										0.00		0.00		0.00
Total Prepayment Amount										1,631,145.61		30,220.43		1,661,366.04

Cumulative


Number of Paid in Full Loans										5		0		5
Number of Repurchased Loans										0		0		0
Total Number of Loans Prepaid in Full										5		0		5
Paid in Full Balance										1,317,270.15		0.00		1,317,270.15
Repurchased Loans Balance										0.00		0.00		0.00
Curtailments Amount										313,875.46		30,220.43		344,095.89
Total Prepayment Amount										1,631,145.61		30,220.43		1,661,366.04










Page 17 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

											Group 2		Group 1		Total



SMM										1.07%		0.02%		0.53%
3 Months Avg SMM										1.07%		0.02%		0.53%
12 Months Avg SMM										1.07%		0.02%		0.53%
Avg SMM Since Cut-off										1.07%		0.02%		0.53%


CPR										12.06%		0.23%		6.20%
3 Months Avg CPR										12.06%		0.23%		6.20%
12 Months Avg CPR										12.06%		0.23%		6.20%
Avg CPR Since Cut-off										12.06%		0.23%		6.20%


PSA										2,215.74%		43.31%		1,159.71%
3 Months Avg PSA Approximation										2,215.73%		43.31%		1,159.70%
12 Months Avg PSA Approximation										2,215.73%		43.31%		1,159.70%
Avg PSA Since Cut-off Approximation										2,215.73%		43.31%		1,159.70%










Page 18 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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 19 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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

120391229 2			305,000.00		304,678.41			21-Sep-2005		6.000%		CA - 65.59%		Paid Off - 360		01-May-2005
			305,000.00

120393284 2			328,000.00		328,000.00			26-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jun-2005
120393284 2					328,000.00			26-Sep-2005		6.250%		CA - 80.00%		Paid Off - 360		01-Jun-2005
120394606 2			312,000.00		312,000.00			05-Oct-2005		6.000%		AZ - 80.00%		Paid Off - 360		01-Jun-2005
120394606 2					312,000.00			05-Oct-2005		6.000%		AZ - 80.00%		Paid Off - 360		01-Jun-2005
120395355 2			300,000.00		299,791.74			11-Oct-2005		6.375%		CA - 49.26%		Paid Off - 360		01-Jun-2005
120395355 2					299,791.74			11-Oct-2005		6.375%		CA - 49.26%		Paid Off - 360		01-Jun-2005
121728523 2			72,800.00		72,800.00			27-Sep-2005		6.750%		MI - 80.00%		Paid Off - 360		01-Sep-2005
121728523 2					72,800.00			27-Sep-2005		6.750%		MI - 80.00%		Paid Off - 360		01-Sep-2005


TOTAL			1,317,800.00		1,317,270.15
TOTAL


Page 20 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Realized Loss Report

COLLATERAL REALIZED LOSSES



											Group 2		Group 1		Total


Current
Current



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

Cumulative
Cumulative



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





		Special Hazard Loss Coverage Amt														3,122,276.00
		Fraud Loss Coverage Amt														9,366,829.00
		Bankrupt Loss Coverage Amt														150,000.00
		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 21 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution


DEFAULT SPEEDS



											Group 2		Group 1		Total



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


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


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


Loss Severity Approximation for Current Period										0.00%		0.00%		0.00%
3 Months Avg Loss Severity Approximation										0.00%		0.00%		0.00%
12 Months Avg Loss Severity Approximation										0.00%		0.00%		0.00%
Avg Loss Severity Approximation Since Cut-off										0.00%		0.00%		0.00%












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IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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 23 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

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		Revision		Loss/(Gain)		Loss/(Gain)




TOTAL



Page 24 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
TRIGGER EVENTS
										Group 2		Group 1		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?
						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
										Group 2		Group 1		Total
Current Senior Percentage										93.865351%		93.876998%
Next Senior Percentage										93.798922%		93.875833%
Current Subordinate Percentage										6.134649%		6.123002%
Next Subordinate Percentage										6.201078%		6.124167%
Senior Prepayment Percentage										100.000000%		100.000000%
Next Senior Prepayment Percentage										100.000000%		100.000000%
Subordinate Prepayment Percentage										0.000000%		0.000000%
Next Subordinate Prepayment Percentage										0.000000%		0.000000%
Aggregate Cap Contract Payment														0.00
CLASS 1-A-1 Yield Maintenance Payment														0.00
CLASS 1-A-3 Yield Maintenance Payment														0.00



Page 25 of 26
IndyMac Residential Asset Securitization Trust 2005-A13

Asset Backed Certificates
Asset Backed Certificates
2005-A13

October 25, 2005 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
										Group 2		Group 1		Total
Current Scheduled Payments										786,007.77		801,176.95		1,587,184.72
Current Scheduled Payments 1 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 2 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 3 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 4 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 5 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 6 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 7 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 8 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 9 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 10 Month Prior										0.00		0.00		0.00
Current Scheduled Payments 11 Month Prior										0.00		0.00		0.00


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




Page 26 of 26

IndyMac RAST 2005-A13 8-K