					Payment Date:	August 25, 2005
					Record Date:	July 29, 2005

Trustee's Report to Certificateholders
Payment Summary
		Certificate	Interest	Original	Beginning	Principal
Class	CUSIP	Interest Rate *	Type	Balance	Balance	Paid
A1	86359B4A6	3.580000%	Variable	$ 284,692,000.00	$ 204,039,732.63	$ 20,780,302.86
A2	86359B4B4	3.680000%	Variable	$ 112,151,000.00	$ 112,151,000.00	$ -
M1	86359B4C2	3.910000%	Variable	$ 31,633,000.00	$ 31,633,000.00	$ -
M2	86359B4D0	3.930000%	Variable	$ 29,332,000.00	$ 29,332,000.00	$ -
M3	86359B4E8	3.980000%	Variable	$ 14,379,000.00	$ 14,379,000.00	$ -
M4	86359B4F5	4.160000%	Variable	$ 28,757,000.00	$ 28,757,000.00	$ -
M5	86359B4G3	4.210000%	Variable	$ 11,503,000.00	$ 11,503,000.00	$ -
M6	86359B4H1	4.660000%	Variable	$ 10,640,000.00	$ 10,640,000.00	$ -
M7	86359B4J7	4.760000%	Variable	$ 10,352,000.00	$ 10,352,000.00	$ -
M8	86359B4K4	5.410000%	Variable	$ 7,189,000.00	$ 7,189,000.00	$ -
B1	96359B4L2	5.960000%	Variable	$ 10,352,000.00	$ 10,352,000.00	$ -
B2	86359B4M0	5.960000%	Variable	$ 5,751,000.00	$ 5,751,000.00	$ -
B3	86359B4N8	5.960000%	Variable	$ 7,477,000.00	$ 7,477,000.00	$ -
B4	86359B4P3	5.960000%	Variable	$ 10,927,000.00	$ 10,927,000.00	$ -
P		0.000000%	N/A	$ -	$ -	N/A
X		5.010375%	Variable	$ -	$ -	N/A
R		0.000000%	N/A	$ -	$ -	N/A
			Totals:	$ 575,135,000.00	$ 494,482,732.63	$ 20,780,302.86
	* Certificate Interest Rate for the LIBOR Certificates reflect the application of the Net Funds Cap.

Distributions Per Certificate
	Beginning	Principal	Interest	Ending
Class	Cert. Factor	Distribution	Distribution	Cert. Factor
A1	716.70342907	72.99222620	2.20943740	643.71120288
A2	1,000.00000000	0.00000000	3.16888889	1,000.00000000
M1	1,000.00000000	0.00000000	3.36694444	1,000.00000000
M2	1,000.00000000	0.00000000	3.38416667	1,000.00000000
M3	1,000.00000000	0.00000000	3.42722222	1,000.00000000
M4	1,000.00000000	0.00000000	3.58222222	1,000.00000000
M5	1,000.00000000	0.00000000	3.62527778	1,000.00000000
M6	1,000.00000000	0.00000000	4.01277778	1,000.00000000
M7	1,000.00000000	0.00000000	4.09888889	1,000.00000000
M8	1,000.00000000	0.00000000	4.65861111	1,000.00000000
B1	1,000.00000000	0.00000000	5.13222222	1,000.00000000
B2	1,000.00000000	0.00000000	5.13222222	1,000.00000000
B3	1,000.00000000	0.00000000	5.13222222	1,000.00000000
B4	1,000.00000000	0.00000000	5.13222222	1,000.00000000
P	NA	NA	NA	NA
R	NA	NA	NA	NA

Mortgage Loan Activity for related Payment Date:
# of Mortgage	Beginning Agg Sched	Principal Remittance	Current	Interest Remittance	Ending Agg Sched	Realized Loss
Loans	Principal Balance	Amount	Realized Loss	Amount	Principal Balance	Since Cutoff
10,173	494,482,732.63	20,738,873.73	41,429.13	3,742,151.84	473,702,429.77	212,292.35

Aggregate Delinquency information for related Payment Date:
	Current	One Month	Two Months	3 Months +	Bankruptcy	Foreclosures
# of Loans	9,878	112	38	95	23	21
Agg Prin Balance	456,966,563.65	5,979,117.81	2,482,449.76	5,366,158.40	869,430.90	1,931,063.28

REO Property and Substitution of Mortgage Loans Information
	REO	Deleted	Qualifying Substitute
	Property	Mortgage Loan	Mortgage Loan
Loan Number	N/A	N/A	N/A
Sched. Prin. Balance	N/A	N/A	N/A
Loan Number	N/A	N/A	N/A
Sched. Prin. Balance	N/A	N/A	N/A

Aggregate Overcollateralization Release Amount		0.00
Principal Distribution Amount		20,738,873.73
Shortfalls	Principal	0.00
	Interest	41,429.13
Ending Overcollateralization Amount		0.00
Overcollateralization Deficiency		0.00

Aggregate Class P Distribution		621,245.27
Aggregate Class X Distribution		14,775,082.79
Aggregate Class R Distribution		0.00

LIBOR Rate

3.46%

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2005-S1

Structured Asset Securities Corp 2005-S1 8-K