
                                       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):  December 27, 2004
                          (Date of earliest event reported)

            Indymac MBS Inc (as Depositor under the Pooling and Servicing
                Agreement, dated as November 1, 2004, providing for the
               issuance of IndyMac INDX Mortgage Loan Trust 2004-AR13
                Mortgage Pass-Through Certificates, Series 2004-AR13)
                 (Exact name of registrant as specified in charter)


                                         DELAWARE
                     (State or Other Jurisdiction of Incorporation)

               333-119384-03                         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
     December 27, 2004.

                                    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:  Dec 28, 2004               By:  /s/  Katherine M. Wannenmacher
                                            Katherine M. Wannenmacher
                                            Vice President


                                   EXHIBIT INDEX

          DOCUMENT

          99.1 Monthly Remittance Statement to the Certificateholders
          dated as of December 27, 2004.



IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

				External Parties					Table of Contents

												Page
				Seller								Page
				Seller					1. Certificate Payment Report					2
				IndyMac INDX Loan Trust					1. Certificate Payment Report					2
				IndyMac INDX Loan Trust					2. Collection Account Report					4
									2. Collection Account Report					4
									3. Credit Enhancement Report					6
									4. Collateral Report					7
				Certificate Insurer(s)					5. Delinquency Report					10
				Certificate Insurer(s)					5. Delinquency Report					10
									6. REO Report					11

									7. Foreclosure Report					12
									8. Prepayment Report					13
									9. Prepayment Detail Report					16
									9. Prepayment Detail Report					16
									10. Realized Loss Report					17
									11. Realized Loss Detail Report					20
				Servicer(s)					11. Realized Loss Detail Report					20
				Servicer(s)					12. Triggers and Adj. Cert. Report					21
				IndyMac Bank					12. Triggers and Adj. Cert. Report					21
				IndyMac Bank					13. Other Related Information					22
									13. Other Related Information					22


				Underwriter(s)
				CS First Boston


									Total Number of Pages					22
									Total Number of Pages

				Dates					Contacts

				Cut-Off Date:		November 01, 2004			Brent Hoyler
				Close Date:		November 29, 2004			Administrator
				First Distribution Date:		December 27, 2004			(714) 247-6322
									Brent.Hoyler@db.com
									Brent.Hoyler@db.com
									Address:
									1761 East St. Andrew Place, Santa Ana, CA 92705
				Distribution Date:		December 27, 2004
									Factor Information:			(800) 735-7777
				Record Date:		November 30, 2004			Factor Information:			(800) 735-7777
									Main Phone Number:			(714) 247-6000
									Main Phone Number:			(714) 247-6000

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






Page 1 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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)

1-A-1	SR	$	161,870,000.00		161,870,000.00	700,784.84		1,026,583.60		1,727,368.44		0.00		0.00		160,843,416.40
1-A-1	SR	$	161,870,000.00		161,870,000.00	700,784.84		1,026,583.60		1,727,368.44		0.00		0.00		160,843,416.40
2-A-1	SR	$	49,435,000.00		49,435,000.00	183,102.87		427,609.61		610,712.48		0.00		0.00		49,007,390.39
2-A-2	SR	$	49,435,000.00		49,435,000.00	203,457.74		427,609.61		631,067.35		0.00		0.00		49,007,390.39
2-A-3	SR	$	10,990,000.00		10,990,000.00	49,867.99		95,062.79		144,930.78		0.00		0.00		10,894,937.21
X	SR/NTL	$	0.00		0.00	62,069.76		0.00		62,069.76		0.00		0.00		0.00
A-R	SR/RES	$	100.00		100.00	0.45		100.00		100.45		0.00		0.00		0.00
B-1	SUB	$	10,580,000.00		10,580,000.00	46,694.58		6,905.10		53,599.68		0.00		0.00		10,573,094.90
B-2	SUB	$	5,960,000.00		5,960,000.00	26,304.32		3,889.83		30,194.15		0.00		0.00		5,956,110.17
B-3	SUB	$	3,725,000.00		3,725,000.00	16,440.20		2,431.14		18,871.34		0.00		0.00		3,722,568.86
B-4	SUB/NOF	$	2,980,000.00		2,980,000.00	13,152.16		1,944.91		15,097.07		0.00		0.00		2,978,055.09
B-5	SUB/NOF	$	1,790,000.00		1,790,000.00	7,900.12		1,168.25		9,068.37		0.00		0.00		1,788,831.75
B-6	SUB/NOF	$	1,190,614.00		1,190,614.00	5,254.75		777.06		6,031.81		0.00		0.00		1,189,836.94
P	NOF	$	100.00		100.00	0.00		0.00		0.00		0.00		0.00		100.00


Total			297,955,814.00		297,955,814.00	1,315,029.78		1,994,081.90		3,309,111.68		0.00		0.00		295,961,732.10
Total




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	11/01/04		11/30/04		A-30/360	45660N7J8		161,870,000.00		1,000.000000		4.329306		6.342025		10.671332	993.657975
2-A-1	11/01/04		11/30/04		A-30/360	45660N7K5		49,435,000.00		1,000.000000		3.703912		8.649936		12.353848	991.350064
2-A-2	11/01/04		11/30/04		A-30/360	45660N7L3		49,435,000.00		1,000.000000		4.115662		8.649936		12.765598	991.350064
2-A-3	11/01/04		11/30/04		A-30/360	45660N7M1		10,990,000.00		1,000.000000		4.537579		8.649935		13.187514	991.350065
X	11/01/04		11/30/04		A-30/360	45660N7N9		98,870,000.00		1,000.000000		0.627792		0.000000		0.627792	991.350064
A-R	11/01/04		11/30/04		A-30/360	45660N7Q2		100.00		1,000.000000		4.500000		1,000.000000		1,004.500000	0.000000
B-1	11/01/04		11/30/04		A-30/360	45660N7R0		10,580,000.00		1,000.000000		4.413476		0.652656		5.066132	999.347344
B-2	11/01/04		11/30/04		A-30/360	45660N7S8		5,960,000.00		1,000.000000		4.413477		0.652656		5.066133	999.347344
B-3	11/01/04		11/30/04		A-30/360	45660N7T6		3,725,000.00		1,000.000000		4.413477		0.652655		5.066132	999.347345
B-4	11/01/04		11/30/04		A-30/360	45660N7U3		2,980,000.00		1,000.000000		4.413477		0.652654		5.066131	999.347346
B-5	11/01/04		11/30/04		A-30/360	45660N7V1		1,790,000.00		1,000.000000		4.413475		0.652654		5.066128	999.347346
B-6	11/01/04		11/30/04		A-30/360	45660N7W9		1,190,614.00		1,000.000000		4.413479		0.652655		5.066134	999.347345
P	11/01/04		11/30/04		A-30/360	IN04AD1P1		100.00		1,000.000000		0.000000		0.000000		0.000000	1,000.000000




Page 2 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

Distribution to Date -
																Current


	Original				Unscheduled	Scheduled		Total		Total		Realized		Deferred		Principal

Class	Face Value		Interest		Principal	Principal		Principal		Distribution		Loss		Interest		Balance
	(1)		(2)		(3)	(4)		(5)=(3)+(4)		(6)=(2)+(5)		(7)		(8)		(9)=(1)-(5)-(7)+(8)
1-A-1	161,870,000.00		700,784.84		1,011,219.91	15,363.69		1,026,583.60		1,727,368.44		0.00		0.00		160,843,416.40
2-A-1	49,435,000.00		183,102.87		354,693.75	72,915.86		427,609.61		610,712.48		0.00		0.00		49,007,390.39
2-A-2	49,435,000.00		203,457.74		354,693.75	72,915.86		427,609.61		631,067.35		0.00		0.00		49,007,390.39
2-A-3	10,990,000.00		49,867.99		78,852.71	16,210.08		95,062.79		144,930.78		0.00		0.00		10,894,937.21
X	0.00		62,069.76		0.00	0.00		0.00		62,069.76		0.00		0.00		0.00
A-R	100.00		0.45		0.00	0.00		100.00		100.45		0.00		0.00		0.00
B-1	10,580,000.00		46,694.58		0.00	6,905.10		6,905.10		53,599.68		0.00		0.00		10,573,094.90
B-2	5,960,000.00		26,304.32		0.00	3,889.83		3,889.83		30,194.15		0.00		0.00		5,956,110.17
B-3	3,725,000.00		16,440.20		0.00	2,431.14		2,431.14		18,871.34		0.00		0.00		3,722,568.86
B-4	2,980,000.00		13,152.16		0.00	1,944.91		1,944.91		15,097.07		0.00		0.00		2,978,055.09
B-5	1,790,000.00		7,900.12		0.00	1,168.25		1,168.25		9,068.37		0.00		0.00		1,788,831.75
B-6	1,190,614.00		5,254.75		0.00	777.06		777.06		6,031.81		0.00		0.00		1,189,836.94
P	100.00		0.00		0.00	0.00		0.00		0.00		0.00		0.00		100.00


Total	297,955,814.00		1,315,029.78		1,799,460.12	194,521.78		1,994,081.90		3,309,111.68		0.00		0.00		295,961,732.10


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

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

Class	Rate		Balance		Interest	Interest SF		Interest		Adjustment		Interest		Interest		Interest
					(1)	(2)		(3)		(4)		(5)=(1)-(2)+(3)+(4)		(6)		(7)=(5)-(6)
1-A-1	5.19517%		161,870,000.00		700,784.84	0.00		0.00		0.00		700,784.84		700,784.84		0.00
2-A-1	4.44469%		49,435,000.00		183,102.87	0.00		0.00		0.00		183,102.87		183,102.87		0.00
2-A-2	4.93879%		49,435,000.00		203,457.74	0.00		0.00		0.00		203,457.74		203,457.74		0.00
2-A-3	5.44509%		10,990,000.00		49,867.99	0.00		0.00		0.00		49,867.99		49,867.99		0.00
X	0.75335%		98,870,000.00		62,069.76	0.00		0.00		0.00		62,069.76		62,069.76		0.00
A-R	5.40000%		100.00		0.43	0.00		0.00		0.00		0.43		0.45		0.00
B-1	5.29617%		10,580,000.00		46,694.58	0.00		0.00		0.00		46,694.58		46,694.58		0.00
B-2	5.29617%		5,960,000.00		26,304.32	0.00		0.00		0.00		26,304.32		26,304.32		0.00
B-3	5.29617%		3,725,000.00		16,440.20	0.00		0.00		0.00		16,440.20		16,440.20		0.00
B-4	5.29617%		2,980,000.00		13,152.16	0.00		0.00		0.00		13,152.16		13,152.16		0.00
B-5	5.29617%		1,790,000.00		7,900.12	0.00		0.00		0.00		7,900.12		7,900.12		0.00
B-6	5.29617%		1,190,614.00		5,254.75	0.00		0.00		0.00		5,254.75		5,254.75		0.00
P	0.00000%		100.00		0.00	0.00		0.00		0.00		0.00		0.00		0.00


Total			396,825,814.00		1,315,029.76	0.00		0.00		0.00		1,315,029.76		1,315,029.78		0.00



Page 3 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Collection Account Report
SUMMARY
SUMMARY
									Group 2		Group 1		Total
Principal Collections									965,914.96		1,028,166.95		1,994,081.91
Principal Withrawals									0.00		0.00		0.00
Principal Other Accounts									0.00		0.00		0.00
TOTAL NET PRINCIPAL									965,914.96		1,028,166.95		1,994,081.91
Interest Collections									561,444.01		785,527.98		1,346,971.99
Interest Withdrawals									-0.00		-0.00		-0.00
Interest Other Accounts									0.00		0.00		0.00
Interest Fees									-14,853.13		-17,089.09		-31,942.22
TOTAL NET INTEREST									546,590.88		768,438.89		1,315,029.77
TOTAL AVAILABLE FUNDS FOR DISTRIBUTION									1,512,505.84		1,796,605.84		3,309,111.68



PRINCIPAL - COLLECTIONS
PRINCIPAL - COLLECTIONS
										Group 2		Group 1		Total
Scheduled Principal Received										12,874.74		16,848.54		29,723.28
Curtailments										3,548.15		33,788.42		37,336.57
Prepayments In Full										784,692.07		977,529.99		1,762,222.06
Repurchased/Substitutions										164,800.00		0.00		164,800.00
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										-10,070.81		-12,057.96		-22,128.77
Realized Losses										-0.00		-0.00		-0.00
Advanced Principal										10,070.81		12,057.96		22,128.77
TOTAL PRINCIPAL COLLECTED										965,914.96		1,028,166.95		1,994,081.91


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 4 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

INTEREST - COLLECTIONS
INTEREST - COLLECTIONS
									Group 2		Group 1		Total
Scheduled Interest									584,314.99		825,163.97		1,409,478.95
Repurchased/Substitution Interest									772.50		0.00		772.50
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									-860.80		-92.41		-953.21
Delinquent Interest									-369,417.38		-590,012.01		-959,429.38
Compensating Interest									860.80		92.41		953.21
Civil Relief Act Shortfalls									-0.00		-0.00		-0.00
Interest Advanced									345,773.90		550,376.02		896,149.92
TOTAL INTEREST COLLECTED									561,444.01		785,527.98		1,346,971.99


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									13,999.88		15,831.82		29,831.70
Trustee Fees									853.25		1,257.27		2,110.52
TOTAL INTEREST FEES									14,853.13		17,089.09		31,942.22




Page 5 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Credit Enhancement Report
ACCOUNTS

SPACE INTENTIONALLY LEFT BLANK



INSURANCE

SPACE INTENTIONALLY LEFT BLANK



STRUCTURAL FEATURES

SPACE INTENTIONALLY LEFT BLANK




Page 6 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Collateral Report


COLLATERAL



										Group 2		Group 1		Total



*Loan Count:*


Original									408		557		965
Prior									408		557		965
Prefunding									0		0		0
Scheduled Paid Offs									-0		-0		-0
Full Voluntary Prepayments									-3		-3		-6
Repurchases									-1		-0		-1
Liquidations									-0		-0		-0
Current									404		554		958
*Principal Balance:*


Original									120,458,720.24		177,496,994.24		297,955,714.48
Prior									120,458,720.24		177,496,994.24		297,955,714.48
Prefunding									0.00		0.00		0.00
Scheduled Principal									-12,874.74		-16,848.54		-29,723.28
Partial Prepayments									-3,548.15		-33,788.42		-37,336.57
Full Voluntary Prepayments									-784,692.07		-977,529.99		-1,762,222.06
Repurchases									-164,800.00		-0.00		-164,800.00
Liquidations									-0.00		-0.00		-0.00
Current									119,492,805.28		176,468,827.29		295,961,632.57





PREFUNDING

SPACE INTENTIONALLY LEFT BLANK






Page 7 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

CHARACTERISTICS
CHARACTERISTICS
									Group 2		Group 1		Total
Weighted Average Coupon Original									5.82859%		5.57867%		5.67971%
Weighted Average Coupon Prior									5.82859%		5.57867%		5.67971%
Weighted Average Coupon Current									5.82859%		5.57867%		5.67971%
Weighted Average Months to Maturity Original									359		359		359
Weighted Average Months to Maturity Prior									359		359		359
Weighted Average Months to Maturity Current									359		359		359
Weighted Avg Remaining Amortization Term Original									359		359		359
Weighted Avg Remaining Amortization Term Prior									359		359		359
Weighted Avg Remaining Amortization Term Current									359		359		359
Weighted Average Seasoning Original									1.26		1.28		1.27
Weighted Average Seasoning Prior									1.26		1.28		1.27
Weighted Average Seasoning Current									1.26		1.28		1.27









Page 8 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

ARM CHARACTERISTICS
ARM CHARACTERISTICS
									Group 2		Group 1		Total
Weighted Average Margin Original									2.75000%		2.75417%		2.75249%
Weighted Average Margin Prior									2.75000%		2.75417%		2.75249%
Weighted Average Margin Current									2.75000%		2.75417%		2.75249%
Weighted Average Max Rate Original									11.82859%		11.57867%		11.67971%
Weighted Average Max Rate Prior									11.82859%		11.57867%		11.67971%
Weighted Average Max Rate Current									11.82859%		11.57867%		11.67971%
Weighted Average Min Rate Original									2.75000%		2.75417%		2.75249%
Weighted Average Min Rate Prior									2.75000%		2.75417%		2.75249%
Weighted Average Min Rate Current									2.75000%		2.75417%		2.75249%
Weighted Average Cap Up Original									1.56373%		1.55834%		1.56052%
Weighted Average Cap Up Prior									1.56373%		1.55834%		1.56052%
Weighted Average Cap Up Current									1.56373%		1.55834%		1.56052%
Weighted Average Cap Down Original									1.56373%		1.55834%		1.56052%
Weighted Average Cap Down Prior									1.56373%		1.55834%		1.56052%
Weighted Average Cap Down Current									1.56373%		1.55834%		1.56052%




SERVICING FEES & ADVANCES

										Group 2		Group 1		Total




Current Servicing Fees									13,999.88		15,831.82		29,831.70
Delinquent Servicing Fees									23,643.47		39,635.99		63,279.46
TOTAL SERVICING FEES									37,643.35		55,467.81		93,111.17


Total Servicing Fees									37,643.35		55,467.81		93,111.17
Compensating Interest									-860.80		-92.41		-953.21
Delinquent Servicing Fees									-23,643.47		-39,635.99		-63,279.46
COLLECTED SERVICING FEES									13,139.08		15,739.41		28,878.50


Total Advaced Interest									345,773.90		550,376.02		896,149.92
Total Advaced Principal									10,070.81		12,057.96		22,128.77
Aggregate Advances with respect to this Distribution									355,844.71		562,433.98		918,278.69





ADDITIONAL COLLATERAL INFORMATION
									Group 2		Group 1		Total
Prepayment Interest Shortfall (PPIS)									860.80		92.41		953.21
Compensating Interest									-860.80		-92.41		-953.21
Net Prepayment Interest Shortfall (PPIS)									0.00		0.00		0.00

Weighted Average Net Mortgage Rate									5.445094%		5.195168%		5.296209%





Page 9 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Delinquency Report

	TOTAL
					< 1 PAYMENT	1 PAYMENT		2 PAYMENTS		3+ PAYMENTS		TOTAL
	DELINQUENT		Balance			3,651,963.68		0.00		0.00		3,651,963.68
			% Balance			1.23%		0.00%		0.00%		1.23%
			# Loans			8		0		0		8
			% # Loans			0.84%		0.00%		0.00%		0.84%
	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	3,651,963.68		0.00		0.00		3,651,963.68
			% Balance		0.00%	1.23%		0.00%		0.00%		1.23%
			# Loans		0	8		0		0		8
			% # Loans		0.00%	0.84%		0.00%		0.00%		0.84%









Page 10 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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
SPACE INTENTIONALLY LEFT BLANK
SPACE INTENTIONALLY LEFT BLANK



TOTAL



Page 11 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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 12 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Prepayment Report

VOLUNTARY PREPAYMENTS
VOLUNTARY PREPAYMENTS

										Group 2		Group 1		Total




*Current*


Number of Paid in Full Loans									3		3		6
Number of Repurchased Loans									1		0		1
Total Number of Loans Prepaid in Full									4		3		7
Curtailments Amount									3,548.15		33,788.42		37,336.57
Paid in Full Balance									784,692.07		977,529.99		1,762,222.06
Repurchased Loans Balance									164,800.00		0.00		164,800.00
Total Prepayment Amount									953,040.22		1,011,318.41		1,964,358.63

*Cumulative*


Number of Paid in Full Loans									3		3		6
Number of Repurchased Loans									1		0		1
Total Number of Loans Prepaid in Full									4		3		7
Paid in Full Balance									784,692.07		977,529.99		1,762,222.06
Repurchased Loans Balance									164,800.00		0.00		164,800.00
Curtailments Amount									3,548.15		33,788.42		37,336.57
Total Prepayment Amount									953,040.22		1,011,318.41		1,964,358.63










Page 13 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution

VOLUNTARY PREPAYMENTS RATES
VOLUNTARY PREPAYMENTS RATES

										Group 2		Group 1		Total



SMM									0.79%		0.57%		0.66%
3 Months Avg SMM									0.79%		0.57%		0.66%
12 Months Avg SMM									0.79%		0.57%		0.66%
Avg SMM Since Cut-off									0.79%		0.57%		0.66%


CPR									9.09%		6.63%		7.63%
3 Months Avg CPR									9.09%		6.63%		7.63%
12 Months Avg CPR									9.09%		6.63%		7.63%
Avg CPR Since Cut-off									9.09%		6.63%		7.63%


PSA									3,616.44%		2,589.12%		3,002.85%
3 Months Avg PSA Approximation									3,616.44%		2,589.11%		3,002.82%
12 Months Avg PSA Approximation									3,616.44%		2,589.11%		3,002.82%
Avg PSA Since Cut-off Approximation									3,616.44%		2,589.11%		3,002.82%










Page 14 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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))
	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)
	Average CPR over period between the nth month and mth month (AvgCPRn,m): 1-((1-AvgSMMn,m)^12)

	Average PSA Approximation over period between the nth month and mth month: AvgCPRn,m/(0.002*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)

	Note: Prepayment rates are calculated since deal issue date and include partial and full voluntary prepayments, liquidations, and repurchases.
	Dates correspond to distribution dates.




Page 15 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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

3635761 1			162,830.00		162,829.99		30-Nov-2004		5.500%		NV - 95.00%		Paid Off - 360		11/01/2004
3635761 1			162,830.00		162,829.99		30-Nov-2004		5.500%		NV - 95.00%		Paid Off - 360		11/01/2004
120092122 1			524,700.00		524,700.00		30-Nov-2004		5.125%		CO - 69.96%		Paid Off - 360		11/01/2004
120181891 2			342,004.00		342,004.00		24-Nov-2004		5.375%		MI - 69.09%		Paid Off - 360		11/01/2004
120227698 2			87,750.00		87,688.07		23-Nov-2004		7.750%		IL - 75.00%		Paid Off - 360		11/01/2004
120351416 1			290,000.00		290,000.00		07-Dec-2004		5.875%		NJ - 63.04%		Paid Off - 360		12/01/2004
120420100 2			355,000.00		355,000.00		23-Nov-2004		5.250%		FL - 66.98%		Paid Off - 360		11/01/2004
120492540 2			164,800.00		164,800.00		30-Nov-2004		5.625%		CA - 80.00%		Repur/Subs - 360		12/01/2004


TOTAL			1,927,084.00		1,927,022.06
TOTAL


Page 16 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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													2,979,557.14
		Fraud Loss Coverage Amt													8,938,674.00
		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 17 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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%












Page 18 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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 19 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 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 20 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Triggers and Adj. Cert. Report
TRIGGER EVENTS
TRIGGER EVENTS
									Group 2		Group 1		Total
Has Optional Termination Date Reached (0=No,1=Yes)													0
Has Sr. Prepay Stepdown Condition Occurred (0=No,1=Yes)									0		0
Has Sr. Credit Supp. Depletion Date Occured (0=No,1=Yes)													0
Has Special Haz. Cov. Term Date Occured (0=No,1=Yes)													0
Has Fraud Loss Coverage Term Date Occured (0=No,1=Yes)													0
Has BK Loss Cov. Term Date Occured (0=No,1=Yes)													0



ADJUSTABLE RATE CERTIFICATE INFORMATION

SPACE INTENTIONALLY LEFT BLANK



ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
									Group 2		Group 1		Total
Current Senior Percentage									91.201367%		91.195967%		91.198150%
Next Senior Percentage									91.143327%		91.145512%		91.144630%
Current Subordinate Percentage									8.798633%		8.804033%		8.801850%
Next Subordinate Percentage									8.856673%		8.854488%		8.855370%
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%




Page 21 of 22
IndyMac INDX Mortgage Loan Trust 2004-AR13

Collateralized Asset-Backed Bonds
Collateralized Asset-Backed Bonds
2004-AR13

December 27, 2004 Distribution
Other Related Information
ADDITIONAL INFORMATION
ADDITIONAL INFORMATION
									Group 2		Group 1		Total
Current Scheduled Payments									597,189.73		842,012.51		1,439,202.23
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 22 of 22

IndyMac Indx Mortgage Loan Trust 2004-AR13 8-K