Statement to Certificateholder

Distribution Information

Deal Information

1. Distribution Summary

Deal Name:

Residential Funding Mtg Sec I, 2006-S1

2. Factor Summary

Asset Type:

Mortgage Pass-Through Certificates

3. Components Information

(Not Applicable)

Closing Date:

01/30/2006

4. Interest Summary

First Distribution Date:

02/25/2006

5. Other Income Detail

(Not Applicable)

Determination Date:

05/23/2006

6. Interest Shortfalls, Compensation and Expenses

Distribution Date:

05/25/2006

Record Date:

7. Prepayment Interest and Basis Risk/Net WAC Shortfall Amounts

(Not Applicable)

Book-Entry:

04/28/2006

8. Collateral Summary

Definitive:

04/28/2006

9. Repurchase Information

Trustee:

Us Bank, Inc.

Main Telephone:

651-495-7000

10. Loan Status Report (Delinquencies)

11. Deal Delinquencies (30 Day Buckets)

GMAC-RFC

Bond Administrator:

Jocelyn Manilay

12. Loss Mitigation and Servicing Modifications

Telephone:

818-260-1504

13. Losses and Recoveries

Pool(s) :

40261,40262

14. Credit Enhancement Report

(Not Applicable)

15. Distribution Percentages

16. Overcollateralization Summary

(Not Applicable)

17. Excess Cash Flow, Overcollateralization
Provisions and Derivative Amounts

(Not Applicable)

18. Performance Tests

19. Lender Paid Mortgage Insurance

(Not Applicable)

20. Comments

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 1 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



	1. Distribution Summary

											Beginning
							Original Face Value						Pass-Through						Principal			Interest		Total Distribution		Principal Loss					Interest		Deferred Interest			Ending Notional/ Principal Balance (1)-(3)-(6)+(8)=(9)
		Class		CUSIP




										(1)					(2)		(3)				(4)				(5)	(6)				(7)				(8)			(9)

I-A-1				76111XJ20	91,448,000.00				90,323,805.03					5.85937999				495,643.93		441,034.58			936,678.51				0.00	0.00				0.00			89,828,161.10


I-A-2				76111XJ38	11,928,000.00				11,781,365.87					4.91142272				64,649.21		48,219.39			112,868.60				0.00	0.00				0.00			11,716,716.66


I-A-3				76111XJ46	23,645,000.00				23,645,000.00					5.75000000				0.00		113,298.96			113,298.96				0.00	0.00				0.00			23,645,000.00


I-A-4				76111XJ53	2,627,000.00				2,627,000.00					5.75000000				0.00		12,587.71			12,587.71				0.00	0.00				0.00			2,627,000.00


I-A-5				76111XJ61	101,177,000.00				101,177,000.00					5.25000000				0.00		442,649.38			442,649.38				0.00	0.00				0.00			101,177,000.00


I-A-6				76111XJ79	11,725,000.00				11,725,000.00					5.75000000				0.00		56,182.29			56,182.29				0.00	0.00				0.00			11,725,000.00


I-A-7				76111XJ87	5,040,000.00				2,511,144.69					5.75000000				1,489,449.00		0.00			1,489,449.00				0.00	0.00				12,032.57			1,033,728.26


I-A-8				76111XJ95	3,035,000.00				3,078,837.51					5.75000000				0.00		0.00			0.00				0.00	0.00				14,752.76			3,093,590.27

								1				1																										1
I-A-9				76111XK28	8,798,000.00				8,798,000.00					5.75000000				0.00		42,157.08			42,157.08				0.00	0.00				0.00			8,798,000.00



II-A				76111XK36	100,219,000.00				98,235,476.01					5.75000000				755,536.28		470,711.66			1,226,247.94				0.00	0.00				0.00			97,479,939.73


A-P				76111XK44	2,294,731.97				2,270,493.89					0.00000000				31,158.70		0.00			31,158.70				0.00	0.00				0.00			2,239,335.19

								1				1																										1
A-V				76111XK51	367,089,279.10				361,296,739.70					0.27223463				0.00		81,964.57			81,964.57				0.00	0.00				0.00			358,477,339.61



R-I				76111XK69	100.00				0.00					5.75000000				0.00		0.00			0.00				0.00	0.00				0.00			0.00


R-II				76111XK77	100.00				0.00					5.75000000				0.00		0.00			0.00				0.00	0.00				0.00			0.00


M-1				76111XK85	6,240,600.00				6,227,747.62					5.75000000				4,360.84		29,841.29			34,202.13				0.00	0.00				0.00			6,223,386.78


M-2				76111XK93	2,936,800.00				2,930,751.73					5.75000000				2,052.20		14,043.19			16,095.39				0.00	0.00				0.00			2,928,699.53


M-3				76111XL27	1,468,400.00				1,465,375.86					5.75000000				1,026.09		7,021.59			8,047.68				0.00	0.00				0.00			1,464,349.77


B-1				76111XL35	1,468,400.00				1,465,375.86					5.75000000				1,026.09		7,021.59			8,047.68				0.00	0.00				0.00			1,464,349.77


B-2				76111XL43	1,101,300.00				1,099,031.90					5.75000000				769.58		5,266.19			6,035.77				0.00	0.00				0.00			1,098,262.32


B-3				76111XL50	734,847.13				733,333.73					5.75000000				513.50		3,513.89			4,027.39				0.00	0.00				0.00			732,820.23


			Deal Totals			367,089,279.10			361,296,739.70							2,846,185.42				1,775,513.36			4,621,698.78			0.00			0.00			26,785.33			358,477,339.61

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 2 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006


	1.Notional Balance



2. Factor Summary
Amount /Original Amount per $1000 unit)

	Class	CUSIP		Beginning Notional/ Principal Balance Factor	Principal Distribution Factor	Interest Distribution	Total Distribution	Deferred Interest Factor	Interest Shortfall	Ending Notional/ Principal Balance Factor




	I-A-1	76111XJ20	987.70672984		5.41995374	4.82279088	10.24274462	0.00000000	0.00000000	982.28677609

	I-A-2	76111XJ38	987.70672954		5.41995389	4.04253773	9.46249162	0.00000000	0.00000000	982.28677565

	I-A-3	76111XJ46	1,000.00000000		0.00000000	4.79166674	4.79166674	0.00000000	0.00000000	1,000.00000000

	I-A-4	76111XJ53	1,000.00000000		0.00000000	4.79166730	4.79166730	0.00000000	0.00000000	1,000.00000000

	I-A-5	76111XJ61	1,000.00000000		0.00000000	4.37500005	4.37500005	0.00000000	0.00000000	1,000.00000000

	I-A-6	76111XJ79	1,000.00000000		0.00000000	4.79166652	4.79166652	0.00000000	0.00000000	1,000.00000000

	I-A-7	76111XJ87	498.24299405		295.52559524	0.00000000	295.52559524	2.38741468	0.00000000	205.10481349

	I-A-8	76111XJ95	1,014.44399012		0.00000000	0.00000000	0.00000000	4.86087644	0.00000000	1,019.30486656

	I-A-9	76111XK28	1,000.00000000		0.00000000	4.79166629	4.79166629	0.00000000	0.00000000	1,000.00000000

	II-A	76111XK36	980.20810435		7.53885271	4.69683054	12.23568325	0.00000000	0.00000000	972.66925164

	A-P	76111XK44	989.43751152		13.57836140	0.00000000	13.57836140	0.00000000	0.00000000	975.85915012

	A-V	76111XK51	984.22035257		0.00000000	0.22328239	0.22328239	0.00000000	0.00000000	976.53993189

	R-I	76111XK69	0.00000000		0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

	R-II	76111XK77	0.00000000		0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

	M-1	76111XK85	997.94052174		0.69878537	4.78179822	5.48058360	0.00000000	0.00000000	997.24173637

	M-2	76111XK93	997.94052370		0.69878780	4.78179992	5.48058771	0.00000000	0.00000000	997.24173590

	M-3	76111XL27	997.94052029		0.69878099	4.78179651	5.48057750	0.00000000	0.00000000	997.24173931

	B-1	76111XL35	997.94052029		0.69878099	4.78179651	5.48057750	0.00000000	0.00000000	997.24173931

	B-2	76111XL43	997.94052483		0.69879234	4.78179424	5.48058658	0.00000000	0.00000000	997.24173250

	B-3	76111XL50	997.94052404		0.69878479	4.78179727	5.48058206	0.00000000	0.00000000	997.24173924

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 3 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



	Deal Factor :			97.65399319%


	Group I Factor :			97.76852248%


	Group II Factor :			97.36567979%



4. Interest Summary
The following section only reports information for classes that have accrued interest for this distribution.

Class		Accrual Period			Accrual Methodology	Beginning Notional/Principal Balance			Pass- Through Rate	Optimal Interest		Interest Loss			Deferred Interest		Interest Shortfall Amount		Other Income		Interest Distribution (1)-(2)-(3)- (4)+(5)=(6)		Accrued Certificate Interest Remaining Unpaid






		Start		End							(1)		(2)			(3)		(4)		(5)		(6)
I-A-1	04/01/2006		04/30/2006		30/360		90,323,805.03		5.85937999	441,034.58		0.00		0.00			0.00		0.00		441,034.58		0.00	0.00

I-A-2	04/01/2006		04/30/2006		30/360		11,781,365.87		4.91142272	48,219.39		0.00		0.00			0.00		0.00		48,219.39		0.00	0.00

I-A-3	04/01/2006		04/30/2006		30/360		23,645,000.00		5.75000000	113,298.96		0.00		0.00			0.00		0.00		113,298.96		0.00	0.00

I-A-4	04/01/2006		04/30/2006		30/360		2,627,000.00		5.75000000	12,587.71		0.00		0.00			0.00		0.00		12,587.71		0.00	0.00

I-A-5	04/01/2006		04/30/2006		30/360		101,177,000.00		5.25000000	442,649.38		0.00		0.00			0.00		0.00		442,649.38		0.00	0.00

I-A-6	04/01/2006		04/30/2006		30/360		11,725,000.00		5.75000000	56,182.29		0.00		0.00			0.00		0.00		56,182.29		0.00	0.00

I-A-7	04/01/2006		04/30/2006		30/360		2,511,144.69		5.75000000	12,032.57		0.00		12,032.57			0.00		0.00		0.00		0.00	0.00

I-A-8	04/01/2006		04/30/2006		30/360		3,078,837.51		5.75000000	14,752.76		0.00		14,752.76			0.00		0.00		0.00		0.00	0.00

I-A-9	04/01/2006		04/30/2006		30/360		8,798,000.00	1	5.75000000	42,157.08		0.00		0.00			0.00		0.00		42,157.08		0.00	1.00


II-A	04/01/2006		04/30/2006		30/360		98,235,476.01		5.75000000	470,711.66		0.00		0.00			0.00		0.00		470,711.66		0.00	0.00

A-V	04/01/2006		04/30/2006		30/360		361,296,739.70	1	0.27223463	81,964.57		0.00		0.00			0.00		0.00		81,964.57		0.00	1.00


M-1	04/01/2006		04/30/2006		30/360		6,227,747.62		5.75000000	29,841.29		0.00		0.00			0.00		0.00		29,841.29		0.00	0.00

M-2	04/01/2006		04/30/2006		30/360		2,930,751.73		5.75000000	14,043.19		0.00		0.00			0.00		0.00		14,043.19		0.00	0.00

M-3	04/01/2006		04/30/2006		30/360		1,465,375.86		5.75000000	7,021.59		0.00		0.00			0.00		0.00		7,021.59		0.00	0.00

B-1	04/01/2006		04/30/2006		30/360		1,465,375.86		5.75000000	7,021.59		0.00		0.00			0.00		0.00		7,021.59		0.00	0.00

B-2	04/01/2006		04/30/2006		30/360		1,099,031.90		5.75000000	5,266.19		0.00		0.00			0.00		0.00		5,266.19		0.00	0.00

B-3	04/01/2006		04/30/2006		30/360		733,333.73		5.75000000	3,513.89		0.00		0.00			0.00		0.00		3,513.89		0.00	0.00

Deal Totals						359,026,245.81				1,802,298.69		0.00		26,785.33			0.00		0.00		1,775,513.36		0.00



1.Notional Balance



	Current Index Rates

Index Type		Rate		Classes


USLIB TEL 25 -2BD		4.95938000	I-A-1, I-A-2

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 4 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006


6. Interest Shortfalls, Compensation and Expenses

			Current Prepayment Interest Shortfall Amount		Compensating Interest			Net Prepayment Interest Shortfall Amount (1) - (2)=(3)		Civil Relief Act	Civil Relief Act	Compensation				Advances			Allowable Expenses per	Non-Recoverable






			(1)			(2)			(3)			Subservicer		Master		Subservicer		Master



	Group I	2,256.03		2,256.03			0.00			0	0.00		53,956.84		12,868.93		2,502.80	0.00	0.00	0.00

	Group II	971.17		971.17			0.00			0	0.00		21,299.76		6,186.34		7,395.91	0.00	0.00	0.00

	Deal Totals	3,227.20		3,227.20			0.00			0	0.00		75,256.60		19,055.27		9,898.71	0.00	0.00	0.00

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 5 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



8. Collateral Summary

A. Loan Count and Balances

			Original Loan Count/ Scheduled Principal Balance								Beginning Loan Count/ Scheduled Principal Balance						Curtailments						Payoffs						Total Repurchases				Principal Portion of Losses			Ending Loan Count/ Scheduled Principal Balance



			Count					Balance			Count			Balance			Count			Amount			Count			Amount			Count	Amount	Count			Amount		Count			Balance
Group I
					477		262,724,782.74				472		258,923,438.69			96					143,026.36			3		1,727,108.67			0	0.00		0			0.00		469		256,862,138.27

Group II
					471		104,364,496.36				465		102,373,301.01			79					153,049.72			3		542,817.09			0	0.00		0			0.00		462		101,615,201.34


	Deal Totals			948		367,089,279.10						937	361,296,739.70					175				296,076.08	6			2,269,925.76			0	0.00	0				0.00			931	358,477,339.61



B. Weighted Averages

			Beginning						Ending		Ending Weighted Average Remaining Amortization Term				Ending Weighted Average Months to Maturity		Beginning Weighted Average Net Mortgage			Ending Weighted Average Net Mortgage			Beginning Weighted Average Unmodified Net Mortgage				Net Weighted Average Cap Rate	Weighted Average Net Rate

		Group I
			6.24424624						6.24448464		354.50				354.50		5.92743363			5.92764877			5.92743363				N/A		N/A

		Group II
			6.45932912						6.45946217		354.36				354.36		6.13447928			6.13464637			6.13447928				N/A		N/A

		Deal Totals
			6.30518990						6.30542290		354.46				354.46		5.98609994			5.98632501			5.98609994				N/A		N/A



C. Constant Prepayment Rate

			1 Month CPR							3 Month CPR					6 Month CPR				12 Month CPR						Life CPR


	Group-I		8.34%							6.18%															5.73%

	Group-II		7.86%							5.46%															7.03%

	Deal Totals		8.20%							5.97%															6.10%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 6 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



9. Repurchases

			Breaches Of Representations			ARM Conversions		Optional Repurchases of Defaulted Loans		Others		Total (1)+(2)+(3)+(4)=(5)
				(1)	(2)		(3)			(4)		(5)
		Count				0			0		0		0
				0


	Group I
		Scheduled Balance		0.00		0.00			0.00		0.00			0.00


		Count				0			0		0		0
				0


	Group II
		Scheduled Balance		0.00		0.00			0.00		0.00			0.00



		Count		0		0			0		0		0
	Deal Totals


		Scheduled Balance		0.00		0.00			0.00		0.00		0.00

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 7 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006


10. Loan Status Report
													Delinquency Calculation Method: Mortgage Bankers Association

					Current / Delinquent																	Bankruptcy								Foreclosure								REO																Total
	Deal Totals

		Count								Scheduled Balance					Count				Scheduled Balance				Count				Scheduled Balance					Count			Scheduled Balance				Actual Balance						Count								Scheduled Balance

	Current						924				356,838,097.45				0			0.00								0			0.00				0				0.00							0.00						924		356,838,097.45

	30 days					6					1,240,700.36				0			0.00								0			0.00				0				0.00							0.00						6		1,240,700.36

	60 days					1					398,541.80				0			0.00								0			0.00				0				0.00							0.00						1		398,541.80

	90 days					0					0.00				0			0.00								0			0.00				0				0.00							0.00						0		0.00

	120 days					0					0.00				0			0.00								0			0.00				0				0.00							0.00						0		0.00

	150 days					0					0.00				0			0.00								0			0.00				0				0.00							0.00						0		0.00

	180 days					0					0.00				0			0.00								0			0.00				0				0.00							0.00						0		0.00

	181+ days					0					0.00				0			0.00								0			0.00				0				0.00							0.00						0		0.00

	Total							931			358,477,339.61				0		0.00								0			0.00			0					0.00					0.00						931				358,477,339.61


	Current			99.25%								99.54%			0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%								99.25%		99.54%

	30 days					0.64%					0.35%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%							0.64%			0.35%

	60 days					0.11%					0.11%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%							0.11%			0.11%

	90 days					0.00%					0.00%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%							0.00%			0.00%

	120 days					0.00%					0.00%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%							0.00%			0.00%

	150 days					0.00%					0.00%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%							0.00%			0.00%

	180 days					0.00%					0.00%				0.00%						0.00%				0.00%				0.00%				0.00%		0.00%							0.00%						0.00%				0.00%

	181+ days					0.00%					0.00%				0.00%					0.00%					0.00%				0.00%				0.00%		0.00%								0.00%						0.00%			0.00%

	Total		100.00%						100.00%					0.00%		0.00%								0.00%				0.00%			0.00%			0.00%						0.00%						100.00%					100.00%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 8 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



			Current / Delinquent											Bankruptcy						Foreclosure					REO											Total
Group I

	Count						Scheduled Balance							Count			Scheduled Balance	Count				Scheduled Balance					Count			Scheduled Balance	Actual Balance				Count					Scheduled Balance


Current						468						256,444,502.20		0		0.00					0			0.00				0		0.00			0.00					468			256,444,502.20

30 days					1					417,636.07			0			0.00					0			0.00				0		0.00			0.00					1			417,636.07

60 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

90 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

120 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

150 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

180 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

181+ days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

Total					469					256,862,138.27			0			0.00				0				0.00				0		0.00				0.00				469			256,862,138.27


Current				99.79%				99.84%						0.00%		0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				99.79%			99.84%

30 days				0.21%							0.16%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.21%				0.16%

60 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

90 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

120 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

150 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

180 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

181+ days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

Total		100.00%							100.00%				0.00%		0.00%				0.00%				0.00%			0.00%			0.00%			0.00%					100.00%		100.00%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 9 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



			Current / Delinquent											Bankruptcy						Foreclosure					REO											Total
Group II

	Count						Scheduled Balance							Count			Scheduled Balance	Count				Scheduled Balance					Count			Scheduled Balance	Actual Balance				Count					Scheduled Balance


Current						456						100,393,595.25		0		0.00					0			0.00				0		0.00			0.00					456			100,393,595.25

30 days					5					823,064.29			0			0.00					0			0.00				0		0.00			0.00					5			823,064.29

60 days					1					398,541.80			0			0.00					0			0.00				0		0.00			0.00					1			398,541.80

90 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

120 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

150 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

180 days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

181+ days					0					0.00			0			0.00					0			0.00				0		0.00			0.00					0			0.00

Total					462					101,615,201.34			0			0.00				0				0.00				0		0.00				0.00				462			101,615,201.34


Current				98.70%				98.80%						0.00%		0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				98.70%			98.80%

30 days				1.08%							0.81%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				1.08%				0.81%

60 days				0.22%							0.39%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.22%		0.39%

90 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

120 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

150 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

180 days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

181+ days				0.00%							0.00%		0.00%			0.00%				0.00%				0.00%				0.00%		0.00%				0.00%				0.00%		0.00%

Total		100.00%							100.00%				0.00%		0.00%				0.00%				0.00%			0.00%			0.00%			0.00%					100.00%		100.00%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 10 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



11. Delinquency Data

			Totals				Totals					Totals					Totals					Totals
		Count % Count		Balance % Balance		Count % Count		Balance % Balance			Count % Count		Balance % Balance			Count % Count		Balance % Balance			Count % Count		Balance % Balance

			6	1,240,700.36			0		0.00			0		0.00			0		0.00			0		0.00
	1 Month				13 Months					25 Months					37 Months					49 Months


			0.64%	0.35%			0.00%	0.00%				0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			1	398,541.80			0		0.00			0		0.00			0		0.00			0		0.00
	2 Months				14 Months					26 Months					38 Months					50 Months


			0.11%	0.11%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	3 Months				15 Months					27 Months					39 Months					51 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	4 Months				16 Months					28 Months					40 Months					52 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	5 Months				17 Months					29 Months					41 Months					53 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	6 Months				18 Months					30 Months					42 Months					54 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%

			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	7 Months				19 Months					31 Months					43 Months					55 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%

																	0		0.00
			0	0.00			0		0.00			0		0.00								0		0.00

	8 Months				20 Months					32 Months					44 Months					56 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	9 Months				21 Months					33 Months					45 Months					57 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%


			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	10 Months				22 Months					34 Months					46 Months					58 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%

														0.00					0.00
			0	0.00			0		0.00			0					0					0		0.00

	11 Months				23 Months					35 Months					47 Months					59 Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%

			0	0.00			0		0.00			0		0.00			0		0.00			0		0.00
	12 Months				24 Months					36 Months					48 Months					60+ Months


			0.00%	0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%			0.00%		0.00%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 11 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



12. Loss Mitigation and Servicing Modifications


			Current			1 Payment			2 Payments				3+ Payments				Foreclosure				REO		Total

		Modification Type	Count		Scheduled Balance	Count		Scheduled Balance	Count			Scheduled Balance	Count		Scheduled Balance		Count	Scheduled Balance			Count	Scheduled Balance	Count	Scheduled Balance


Group I		Capitalizations	0		0.00	0		0.00		0		0.00		0		0.00	0		0.00	0		0.00	0	0.00


		Other Modifications	0		0.00	0		0.00		0		0.00		0		0.00	0		0.00	0		0.00	0	0.00



Group II		Capitalizations	0		0.00	0		0.00		0		0.00		0		0.00	0		0.00	0		0.00	0	0.00


		Other Modifications	0		0.00	0		0.00		0		0.00		0		0.00	0		0.00	0		0.00	0	0.00



		Capitalizations		0	0.00		0	0.00			0	0.00		0		0.00	0		0.00	0		0.00	0	0.00

	Deal Totals
		Other
				0	0.00		0	0.00			0	0.00		0		0.00	0		0.00	0		0.00	0	0.00



				Payoffs										Repurchases					Liquidations													Total

		Current Month					Cumulative						Current Month			Cumulative			Current Month				Cumulative								Current Month						Cumulative
Modification Type

		Count			Scheduled Balance		Count		Scheduled Balance			Count			Scheduled Balance	Count	Scheduled Balance	Count		Scheduled Balance			Count		Scheduled Balance					Count					Scheduled Balance		Count		Scheduled Balance


Group I	Capitalizations		0		0.00		0			0.00			0		0.00	0	0.00	0		0.00			0				0.00			0					0.00		0				0.00


	Other Modifications		0		0.00		0			0.00			0		0.00	0	0.00	0		0.00			0				0.00			0					0.00		0		0.00



Group II	Capitalizations		0		0.00		0			0.00			0		0.00	0	0.00	0		0.00			0				0.00			0					0.00		0				0.00


	Other Modifications		0		0.00		0			0.00			0		0.00	0	0.00	0		0.00			0				0.00			0					0.00		0		0.00



Deal Totals	Capitalizations		0		0.00		0			0.00			0		0.00	0	0.00	0		0.00		0				0.00			0					0.00		0				0.00


	Other Modifications

		0		0.00		0		0.00			0			0.00	0	0.00	0		0.00		0			0.00				0					0.00		0			0.00

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 12 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



13. Losses and Recoveries
A. Current Cycle Realized Losses

			Current Period Realized Losses		Liquidations					Charge-Offs					Servicing Modifications						Bankruptcy Losses	Total

		Loss Count			0								0					0			0				0


	Group I	Beginning Aggregate Scheduled Balance			0.00								0.00						0.00		0.00				0


		Principal Portion of Loss					0.00							0.00						0.00	0.00					0.00



		Interest Portion of Loss						0.00						0.00						0.00	0.00					0.00


		Total Realized Loss		0.00								0.00					0.00				0.00	0.00


		Loss Count			0								0					0			0				0


	Group II	Beginning Aggregate Scheduled Balance			0.00								0.00						0.00		0.00				0


		Principal Portion of Loss					0.00							0.00						0.00	0.00					0.00



		Interest Portion of Loss						0.00						0.00						0.00	0.00					0.00


		Total Realized Loss		0.00								0.00					0.00				0.00	0.00


		Loss Count							0				0					0			0						0


		Beginning Aggregate Scheduled Balance							0.00				0.00					0.00			0.00						0.00
	Deal Totals



		Principal Portion of Loss							0.00				0.00					0.00			0.00						0.00


		Interest Portion of Loss						0.00					0.00					0.00			0.00						0.00


		Total Realized Loss					0.00				0.00					0.00					0.00			0.00


B. Cumulative Realized Losses

			Cumulative Realized Losses		Liquidations					Charge-Offs					Servicing Modifications						Bankruptcy Losses	Total


	Group I	Loss Count			0								0					0			0				0


		Total Realized Loss				0.00								0.00						0.00	0.00					0.00



	Group II	Loss Count			0								0					0			0				0


		Total Realized Loss				0.00								0.00						0.00	0.00					0.00



	Deal Totals	Loss Count					0						0					0			0		0


		Total Realized Loss				0.00							0.00					0.00			0.00		0.00

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 13 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



C. Subsequent Recoveries

				Subsequent Recoveries	Current Period								Cumulative


			Subsequent Recoveries Count				0			0
		Group I
			Subsequent Recoveries					0.00			0.00


			Net Loss 1					0.00				0.00


			Net Loss % 2						0.00%					0.00%


			Subsequent Recoveries Count				0			0
		Group II
			Subsequent Recoveries					0.00			0.00


			Net Loss 1					0.00				0.00


			Net Loss % 2						0.00%					0.00%


			Subsequent Recoveries Count					0		0


			Subsequent Recoveries					0.00		0.00
		Deal Totals


			Net Loss 1					0.00		0.00



			Net Loss % 2			0.00%				0.00%

	1 Total Realized Loss less Subsequent Recoveries
	2 Net Loss % of Original Balance

D. Default Percentages

Default Loss Percentage

1 Month

3 Months

6 Months

12 Months

Life of Deal

Group

Monthly Default Rate

0.00%

Constant Default Rate

0.00%

Group

Monthly Default Rate

0.00%

Constant Default Rate

0.00%

Monthly Default Rate

0.00%

Deal Totals

Constant Default Rate

0.00%

1-Month MDR (Current Month) = SUM(Beginning Scheduled balances of liquidating loans) / [SUM(Beginning Scheduled loan balances)- SUM(Scheduled Principal payments)]
m-Month = 3, 6, 12, months or the life of deal to date
m-Month MDR(over m months in period where n is current month)= 1-[(1-MDRn-m+1) * (1-MDRn-m+2) *.* (1-MDR n-1) * (1-MDRn)]^(1/m)
CDRm = 1- [(1- MDRm)^12],where m is number of months in period

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 14 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006

E. Special Hazard, Fraud Loss, and Bankruptcy

Special Hazard Amount

Fraud Loss Amount

Bankruptcy Amount

Deal Totals

3,670,893.00

11,012,678.00

100,000.00



15. Distribution Percentages


		Beginning Current Super		Beginning Current	Beginning Current		Beginning Current Senior

	I	0.00000000%		0.00000000%	95.34445948%	100.00000000%



	II	0.00000000%		0.00000000%	95.95810142%	100.00000000%



		Ending Percentage

	M-1		1.74697441%

	M-2		0.82211878%

	M-3		0.41105939%

	Class M Total:		2.98015258%


	B-1		0.41105939%

	B-2		0.30829454%

	B-3		0.20571085%

	Class B Total:		0.92506478%

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 15 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006


18. Performance Tests

			Group I	Group II

	Current Distribution Date >= Target Distribution

		Current Distribution Date >= Target Distribution Date	False	False

	Current Senior Pct > Initial Senior Percent

		Current Senior Percentage > Original Senior Percentage	False	False

	60+ Dlq Avg Loan Balance / Subordinate Balance

		Dlq Average Loan Balance / Class M and B balance Test	False	False

	60+ Dlq Avg Loan Balance <= 2% of Pool Balance

		Dlq Average Loan Balance Test	False	False

	Sub Balance Test OR 2% Delinquency Test

		Dlq Balance Test	False	False

	Aggregate Realized Loss Pct < Scheduled Loss Pct

		Aggregate Realized Loss Test	False	False

	Sr. Accel. % Trigger - 1st Trigger Event

		1st Senior Accelerated Stepdown Trigger	False	False

	60+ Dlq Avg Loan Balance <= 4% of Avg Pool Balance

		2nd 60+ Delinquent Average Loan Balance Test	False	False

	Aggregate Realized Loss Pct < Scheduled Loss Pct

		Aggregate Realized Loss Percentage > 2nd Scheduled Loss Percentage	False	False

	Sr. Accel. % Trigger - 2nd Trigger Event

		2nd Senior Accelerated Stepdown Trigger	False	False

	60+ Delinq Balance OR Aggregate Loss Test

		Senior Accelerated Stepdown Trigger in effect?	False	False

	Senior Accelerated Stepdown Date and Trigger Event

		Senior Accelerated Stepdown Trigger in effect?	False	False

	M-2, M-3, B-1, B-2, B-3 BegBal/PoolBal

		Class M-2 Prepayment Distribution Trigger	False	False

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 16 of 17

Statement to Certificateholder

Residential Funding Mtg Sec I, 2006-S1

May 25, 2006



M-3, B-1, B-2, B-3 BegBal/PoolBal

	Class M-3 Prepayment Distribution Trigger	False	False

B-1, B-2, B-3 BegBal/PoolBal

	Class B-1 Prepayment Distribution Trigger	False	False

B-2, B-3 BegBal/PoolBal

	Class B-2 Prepayment Distribution Trigger	False	False

B-3 BegBal/PoolBal

	Class B-3 Prepayment Distribution Trigger	False	False



20. Comments

	ERISA Text:	Each beneficial owner of any Certificate (or any interest therein) which provides credit enhancement for any other Certificate and is available in book-entry form, including any such

		Class M Certificate, shall be deemed to have represented, by virtue of its acquisition or holding of such Certificate (or interest therein), that either: a) it is not an employee benefit
		or other plan subject to the prohibited transaction provision of the Employee Retirement Income Security Act of 1974, as amended('ERISA'), or Section 4975 of the Internal Revenue
		Code of 1986, as amended (a 'Plan'), or any other person (including an investment manager, a named fiduciary or a trustee of any Plan) acting, directly or indirectly, on behalf of
		purchasing any Certificate with 'plan assets' of any Plan; or b) (i) the transferee is an insurance company, (ii) the source of funds to be used by it to purchase the Certificates is an
		'insurance company general account' (within the meaning of Department of Labor Prohibited Transaction Class Exemption ('PTCE') 95-60), and (iii) the conditions set forth in
		Section I and III of PTCE 95-60 have been satisfied. Any purported beneficial owner of any such book-entry Certificate (or interest therein) to whom either (a) or (b) above does not
		apply shall indemnify and hold harmless the Company, the Trustee, the Master Servicer, any Subservicer, and the Trust Fund from and against any and all liabilities, claim, cost or
		expenses incurred by such parties as a result of its acquisition or holding of such Certificate.

05/24/2006

5:56:22PM

GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors

Page 17 of 17



	Statement To Certificateholder



	Residential Funding Mtg. Securities I, 2006-S1

	May 25, 2006



	Cash Flow Received and Uses of Funds


	Cash Flow Received		Amount

	Principal and Interest Payments		4,637,526.82
	Prepayment Premium		NA
	Liquidation and Insurance Proceeds		0.00
	Subsequent Recoveries		0.00
	Repurchase Proceeds		0.00
	Other Deposits/Adjustments (including Derivative Payment)		3,227.20
	Total Deposits		4,640,754.02

	Uses of Funds		Amount

	Transfer to Certificate Account		4,621,698.78
	Reimbursed Advances and Expenses		0.00
	Master Servicing Compensation		19,055.27
	Derivative Payment		N/A
	Total Withdrawals		4,640,754.05

	Ending Balance		0.00



		GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors	Appendix A

RFMSI Series 2006-S1 Trust 10-D