8-K 1 jpa050s1_10505.txt 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): May 25, 2005 J.P. MORGAN MORTGAGE TRUST Mortgage Pass-Through Certificates, Series 2005-S1 Trust (Exact name of registrant as specified in its charter) New York (governing law of 333-109775-12 54-2168010 Pooling and Servicing Agreement) (Commission 54-2168011 (State or other File Number) 54-2168012 jurisdiction IRS EIN of Incorporation) c/o Wells Fargo Bank, N.A. 9062 Old Annapolis Road Columbia, Maryland 21045 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (410) 884-2000 (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 under the Exchange Act (17 CFR 240.14a-12) [ ] 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 On May 25, 2005 a distribution was made to holders of J.P. MORGAN MORTGAGE TRUST, Mortgage Pass-Through Certificates, Series 2005-S1 Trust. ITEM 9.01 Financial Statements and Exhibits (c) Exhibits Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2005-S1 Trust, relating to the May 25, 2005 distribution. 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. J.P. MORGAN MORTGAGE TRUST Mortgage Pass-Through Certificates, Series 2005-S1 Trust (Registrant) By: Wells Fargo Bank, N.A. as Securities Administrator By: /s/ Beth Belfield as Officer By: Beth Belfield as Officer Date: 5/25/2005 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2005-S1 Trust, relating to the May 25, 2005 distribution. EX-99.1

~~SECURITIES~~J.P. ~~AND~~Morgan ~~EXCHANGE~~Acceptance ~~COMMISSION~~Corporation I Mortgage Pass-Through Certificates Record Date: 4/29/2005 Distribution Date: 5/25/2005 J.P. Morgan Acceptance Corporation I Mortgage Pass-Through Certificates Series 2005-S1 Contact: Customer Service - CTSLink Wells Fargo Bank, N.A. Securities Administration Services 7485 New Horizon Way Frederick, MD 21703 Telephone: (301) 815-6600 Fax: (301) 815-6660 Certificateholder Distribution Summary Certificate Certificate Beginning Class Pass-Through Certificate Interest Principal Class CUSIP Description Rate Balance Distribution Distribution 1-A-1 466247MP5 SEN 6.00000% 140,145,780.53 700,728.90 2,241,672.55 1-A-2 466247MQ3 SEN 6.50000% 114,549,901.90 620,478.64 1,844,404.51 1-A-X 466247MR1 IO 6.00000% 0.00 5,093.66 0.00 2-A-1 466247MS9 SEN 8.00000% 18,494,601.46 123,297.34 743,035.61 2-A-2 466247MT7 SEN 8.00000% 17,776,436.23 118,509.57 909,987.58 2-A-3 466247MU4 SEN 5.50000% 11,500,000.00 52,708.33 0.00 2-A-4 466247MV2 IO 5.50000% 0.00 4,791.67 0.00 2-A-5 466247MW0 SEN 6.00000% 18,797,976.31 93,989.88 1,213,316.78 2-A-6 466247MX8 SEN 5.25000% 37,595,952.63 164,482.29 2,426,633.56 2-A-7 466247MY6 SEN 5.50000% 3,381,816.00 15,499.99 0.00 2-A-8 466247MZ3 SEN 5.50000% 11,330,000.00 51,929.17 0.00 A-P 466247NA7 PO 0.00000% 2,522,267.21 0.00 40,146.80 A-R 466247NB5 SEN 6.00000% 0.00 0.00 0.00 B-1 466247NC3 SUB 6.25713% 10,065,671.34 52,485.15 9,703.34 B-2 466247ND1 SUB 6.25713% 4,613,378.68 24,055.41 4,447.31 B-3 466247NE9 SUB 6.25713% 2,726,146.33 14,214.87 2,628.01 B-4 466247NF6 SUB 6.25713% 2,097,035.64 10,934.51 2,021.55 B-5 466247NG4 SUB 6.25713% 1,258,221.38 6,560.71 1,212.93 B-6 466247NH2 SUB 6.25713% 1,887,361.48 9,841.22 1,819.42 Totals 398,742,547.12 2,069,601.31 9,441,029.95

~~Washington~~Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A-1 0.00 137,904,107.99 D2,942,401.C45 0. ~~20549~~00 1-A-2 0.00 112,705,497.39 2,464,883.15 0.00 1-A-X 0.00 0.00 5,093.66 0.00 2-A-1 0.00 17,751,565.85 866,332.95 0.00 2-A-2 0.00 16,866,448.65 1,028,497.15 0.00 2-A-3 0.00 11,500,000.00 52,708.33 0.00 2-A-4 0.00 0.00 4,791.67 0.00 2-A-5 0.00 17,584,659.54 1,307,306.66 0.00 2-A-6 0.00 35,169,319.07 2,591,115.85 0.00 2-A-7 0.00 3,381,816.00 15,499.99 0.00 2-A-8 0.00 11,330,000.00 51,929.17 0.00 A-P 0.00 2,482,120.42 40,146.80 0.00 A-R 0.00 0.00 0.00 0.00 B-1 0.00 10,055,968.00 62,188.49 0.00 B-2 0.00 4,608,931.37 28,502.72 0.00 B-3 0.00 2,723,518.31 16,842.88 0.00 B-4 0.00 2,095,014.09 12,956.06 0.00 B-5 0.00 1,257,008.45 7,773.64 0.00 B-6 0.00 1,885,542.06 11,660.64 0.00 Totals 0.00 389,301,517.19 11,510,631.26 0.00 All distributions required by the Pooling and Servicing Agreement have been calculated by the Certificate Administrator on behalf of the Trustee.

~~Form~~Principal Distribution Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Realized Class Amount Balance Distribution Distribution Accretion Loss (1) 1-A-1 145,167,016.00 140,145,780.53 138,866.01 2,102,806.53 0.00 0.00 1-A-2 121,738,219.00 114,549,901.90 105,034.86 1,739,369.65 0.00 0.00 1-A-X 0.00 0.00 0.00 0.00 0.00 0.00 2-A-1 20,713,645.00 18,494,601.46 17,654.88 725,380.73 0.00 0.00 2-A-2 19,240,454.00 17,776,436.23 19,719.78 890,267.80 0.00 0.00 2-A-3 11,500,000.00 11,500,000.00 0.00 0.00 0.00 0.00 2-A-4 0.00 0.00 0.00 0.00 0.00 0.00 2-A-5 20,750,000.00 18,797,976.31 26,293.04 1,187,023.74 0.00 0.00 2-A-6 41,500,000.00 37,595,952.63 52,586.08 2,374,047.47 0.00 0.00 2-A-7 3,381,816.00 3,381,816.00 0.00 0.00 0.00 0.00 2-A-8 11,330,000.00 11,330,000.00 0.00 0.00 0.00 0.00 A-KP 2,563,316.58 2,522,267.21 2,706.77 37,440.03 0.00 0.00 A-R 100.00 0.00 0.00 0.00 0.00 0.00 B-1 10,094,300.00 10,065,671.34 9,703.34 0.00 0.00 0.00 B-2 4,626,500.00 4,613,378.68 4,447.31 0.00 0.00 0.00 B-3 2,733,900.00 2,726,146.33 2,628.01 0.00 0.00 0.00 B-4 2,103,000.00 2,097,035.64 2,021.55 0.00 0.00 0.00 B-5 1,261,800.00 1,258,221.38 1,212.93 0.00 0.00 0.00 B-6 1,892,729.52 1,887,361.48 1,819.42 0.00 0.00 0.00 Totals 420,596,796.10 398,742,547.12 384,693.98 9,056,335.95 0.00 0.00 (1) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

~~CURRENT~~Principal ~~REPORT~~Distribution Statement (continued) Total Ending Ending Total Principal Certificate Certificate Principal Class Reduction Balance Percentage Distribution 1-A-1 2,241,672.55 137,904,107.99 0.94996861 2,241,672.55 1-A-2 1,844,404.51 112,705,497.39 0.92580209 1,844,404.51 1-A-X 0.00 0.00 0.00000000 0.00 2-A-1 743,035.61 17,751,565.85 0.85699865 743,035.61 2-A-2 909,987.58 16,866,448.65 0.87661386 909,987.58 2-A-3 0.00 11,500,000.00 1.00000000 0.00 2-A-4 0.00 0.00 0.00000000 0.00 2-A-5 1,213,316.78 17,584,659.54 0.84745347 1,213,316.78 2-A-6 2,426,633.56 35,169,319.07 0.84745347 2,426,633.56 2-A-7 0.00 3,381,816.00 1.00000000 0.00 2-A-8 0.00 11,330,000.00 1.00000000 0.00 A-P 40,146.80 2,482,120.42 0.96832379 40,146.80 A-R 0.00 0.00 0.00000000 0.00 B-1 9,703.34 10,055,968.00 0.99620261 9,703.34 B-2 4,447.31 4,608,931.37 0.99620261 4,447.31 B-3 2,628.01 2,723,518.31 0.99620261 2,628.01 B-4 2,021.55 2,095,014.09 0.99620261 2,021.55 B-5 1,212.93 1,257,008.45 0.99620261 1,212.93 B-6 1,819.42 1,885,542.06 0.99620260 1,819.42 Totals 9,441,029.95 389,301,517.19 0.92559316 9,441,029.95

~~Pursuant~~Principal toDistribution ~~Section~~Factors 13Statement orOriginal 15Beginning Scheduled Unscheduled Face Certificate Principal Principal Class (d2) ofAmount ~~the~~Balance Distribution Distribution Accretion 1-A-1 145,167,016.00 965.41063109 0.95659478 14.48542918 0.00000000 1-A-2 121,738,219.00 940.95266746 0.86279281 14.28778624 0.00000000 1-A-X 0.00 0.00000000 0.00000000 0.00000000 0.00000000 2-A-1 20,713,645.00 892.87044651 0.85233092 35.01946326 0.00000000 2-A-2 19,240,454.00 923.90939580 1.02491241 46.27062334 0.00000000 2-A-3 11,500,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A-4 0.00 0.00000000 0.00000000 0.00000000 0.00000000 2-A-5 20,750,000.00 905.92656916 1.26713446 57.20596337 0.00000000 2-A-6 41,500,000.00 905.92656940 1.26713446 57.20596313 0.00000000 2-A-7 3,381,816.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A-8 11,330,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 A-P 2,563,316.58 983.98583682 1.05596399 14.60608896 0.00000000 A-R 100.00 0.00000000 0.00000000 0.00000000 0.00000000 B-1 10,094,300.00 997.16387862 0.96126923 0.00000000 0.00000000 B-2 4,626,500.00 997.16387766 0.96126878 0.00000000 0.00000000 B-3 2,733,900.00 997.16387944 0.96126779 0.00000000 0.00000000 B-4 2,103,000.00 997.16388017 0.96126961 0.00000000 0.00000000 B-5 1,261,800.00 997.16387700 0.96126961 0.00000000 0.00000000 B-6 1,892,729.52 997.16386312 0.96126783 0.00000000 0.00000000 (2) All Classes are Per $1,000 Denomination.

~~Securities~~Principal ~~Exchange~~Distribution ~~Act~~Factors ofStatement ~~1934~~(continued) Total Ending Ending Total Realized Principal Certificate Certificate Principal Class Loss (3) Reduction Balance Percentage Distribution 1-A-1 0.00000000 15.44202403 949.96860712 0.94996861 15.44202403 1-A-2 0.00000000 15.15057905 925.80208841 0.92580209 15.15057905 1-A-X 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2-A-1 0.00000000 35.87179417 856.99865234 0.85699865 35.87179417 2-A-2 0.00000000 47.29553575 876.61386005 0.87661386 47.29553575 2-A-3 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A-4 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2-A-5 0.00000000 58.47309783 847.45347181 0.84745347 58.47309783 2-A-6 0.00000000 58.47309783 847.45347157 0.84745347 58.47309783 2-A-7 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A-8 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 A-P 0.00000000 15.66205295 968.32378777 0.96832379 15.66205295 A-R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 B-1 0.00000000 0.96126923 996.20260939 0.99620261 0.96126923 B-2 0.00000000 0.96126878 996.20260888 0.99620261 0.96126878 B-3 0.00000000 0.96126779 996.20260800 0.99620261 0.96126779 B-4 0.00000000 0.96126961 996.20261056 0.99620261 0.96126961 B-5 0.00000000 0.96126961 996.20260739 0.99620261 0.96126961 B-6 0.00000000 0.96126783 996.20259529 0.99620260 0.96126783 (3) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

~~Date~~Interest ofDistribution ~~Report~~Statement ~~(Date~~Beginning Payment of ~~earliest~~Original ~~event~~Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class Amount Rate Balance Interest Shortfall Shortfall 1-A-1 145,167,016.00 6.00000% 140,145,780.53 700,728.90 0.00 0.00 1-A-2 121,738,219.00 6.50000% 114,549,901.90 620,478.64 0.00 0.00 1-A-X 0.00 6.00000% 1,018,731.48 5,093.66 0.00 0.00 2-A-1 20,713,645.00 8.00000% 18,494,601.46 123,297.34 0.00 0.00 2-A-2 19,240,454.00 8.00000% 17,776,436.23 118,509.57 0.00 0.00 2-A-3 11,500,000.00 5.50000% 11,500,000.00 52,708.33 0.00 0.00 2-A-4 0.00 5.50000% 1,045,454.54 4,791.67 0.00 0.00 2-A-5 20,750,000.00 6.00000% 18,797,976.31 93,989.88 0.00 0.00 2-A-6 41,500,000.00 5.25000% 37,595,952.63 164,482.29 0.00 0.00 2-A-7 3,381,816.00 5.50000% 3,381,816.00 15,499.99 0.00 0.00 2-A-8 11,330,000.00 5.50000% 11,330,000.00 51,929.17 0.00 0.00 A-P 2,563,316.58 0.00000% 2,522,267.21 0.00 0.00 0.00 A-R 100.00 6.00000% 0.00 0.00 0.00 0.00 B-1 10,094,300.00 6.25713% 10,065,671.34 52,485.15 0.00 0.00 B-2 4,626,500.00 6.25713% 4,613,378.68 24,055.41 0.00 0.00 B-3 2,733,900.00 6.25713% 2,726,146.33 14,214.87 0.00 0.00 B-4 2,103,000.00 6.25713% 2,097,035.64 10,934.51 0.00 0.00 B-5 1,261,800.00 6.25713% 1,258,221.38 6,560.71 0.00 0.00 B-6 1,892,729.52 6.25713% 1,887,361.48 9,841.22 0.00 0.00 Totals 420,596,796.10 2,069,601.31 0.00 0.00

~~Reported~~Interest Distribution Statement (continued)~~: March~~ Remaining Ending Non-Supported Total Unpaid Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (4) Distribution Shortfall Balance 1-A-1 0.00 0.00 700,728.90 0.00 137,904,107.99 1-A-2 0.00 0.00 620,478.64 ~~2005~~0.00 112,705,497.39 1-A-X 0.00 0.00 5,093.66 0.00 1,002,828.19 2-A-1 0.00 0.00 123,297.34 0.00 17,751,565.85 2-A-2 0.00 0.00 118,509.57 0.00 16,866,448.65 2-A-3 0.00 0.00 52,708.33 0.00 11,500,000.00 2-A-4 0.00 0.00 4,791.67 0.00 1,045,454.54 2-A-5 0.00 0.00 93,989.88 0.00 17,584,659.54 2-A-6 0.00 0.00 164,482.29 0.00 35,169,319.07 2-A-7 0.00 0.00 15,499.99 0.00 3,381,816.00 2-A-8 0.00 0.00 51,929.17 0.00 11,330,000.00 A-P 0.00 0.00 0.00 0.00 2,482,120.42 A-R 0.00 0.00 0.00 0.00 0.00 B-1 0.00 0.00 52,485.15 0.00 10,055,968.00 B-2 0.00 0.00 24,055.41 0.00 4,608,931.37 B-3 0.00 0.00 14,214.87 0.00 2,723,518.31 B-4 0.00 0.00 10,934.51 0.00 2,095,014.09 B-5 0.00 0.00 6,560.71 0.00 1,257,008.45 B-6 0.00 0.00 9,841.22 0.00 1,885,542.06 Totals 0.00 0.00 2,069,601.31 0.00 (4) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

JInterest Distribution Factors Statement Beginning Payment of Original Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class (5) Amount Rate Balance Interest Shortfall Shortfall 1-A-1 145,167,016.00 6.00000% 965.41063109 4.82705314 0.00000000 0.00000000 1-A-2 121,738,219.00 6.50000% 940.95266746 5.09682699 0.00000000 0.00000000 1-A-X 0.00 6.00000% 920.69010057 4.60345285 0.00000000 0.00000000 2-A-1 20,713,645.00 8.00000% 892.87044651 5.95246950 0.00000000 0.00000000 2-A-2 19,240,454.00 8.00000% 923.90939580 6.15939572 0.00000000 0.00000000 2-A-3 11,500,000.00 5.50000% 1000.00000000 4.58333304 0.00000000 0.00000000 2-A-4 0.00 5.50000% 1000.00000000 4.58333655 0.00000000 0.00000000 2-A-5 20,750,000.00 6.00000% 905.92656916 4.52963277 0.00000000 0.00000000 2-A-6 41,500,000.00 5.25000% 905.92656940 3.96342867 0.00000000 0.00000000 2-A-7 3,381,816.00 5.50000% 1000.00000000 4.58333333 0.00000000 0.00000000 2-A-8 11,330,000.00 5.50000% 1000.00000000 4.58333363 0.00000000 0.00000000 A-P 2,563,316.58 ~~MORGAN~~0.00000% ~~ACCEPTANCE~~983.98583682 ~~CORPORATION~~0.00000000 I0.00000000 0.00000000 A-R 100.00 6.00000% 0.00000000 0.00000000 0.00000000 0.00000000 B-1 10,094,300.00 6.25713% 997.16387862 5.19948387 0.00000000 0.00000000 B-2 4,626,500.00 6.25713% 997.16387766 5.19948341 0.00000000 0.00000000 B-3 2,733,900.00 6.25713% 997.16387944 5.19948425 0.00000000 0.00000000 B-4 2,103,000.00 6.25713% 997.16388017 5.19948169 0.00000000 0.00000000 B-5 1,261,800.00 6.25713% 997.16387700 5.19948486 0.00000000 0.00000000 B-6 1,892,729.52 6.25713% 997.16386312 5.19948566 0.00000000 0.00000000 (5) All Classes are Per $1,000 Denomination.

JInterest Distribution Factors Statement (continued) Remaining Ending Non-Supported Total Unpaid Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (6) Distribution Shortfall Balance 1-A-1 0.00000000 0.00000000 4.82705314 0.00000000 949.96860712 1-A-2 0.00000000 0.00000000 5.09682699 0.00000000 925.80208841 1-A-X 0.00000000 0.00000000 4.60345285 0.00000000 906.31732231 2-A-1 0.00000000 0.00000000 5.95246950 0.00000000 856.99865234 2-A-2 0.00000000 0.00000000 6.15939572 0.00000000 876.61386005 2-A-3 0.00000000 0.00000000 4.58333304 0.00000000 1000.00000000 2-A-4 0.00000000 0.00000000 4.58333655 0.00000000 1000.00000000 2-A-5 0.00000000 0.00000000 4.52963277 0.00000000 847.45347181 2-A-6 0.00000000 0.00000000 3.96342867 0.00000000 847.45347157 2-A-7 0.00000000 0.00000000 4.58333333 0.00000000 1000.00000000 2-A-8 0.00000000 0.00000000 4.58333363 0.00000000 1000.00000000 A-P 0.00000000 ~~MORGAN~~0.00000000 ~~MORTGAGE~~0.00000000 ~~TRUST~~0.00000000 ~~2005~~968.32378777 A-S1R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 B-1 0.00000000 0.00000000 5.19948387 0.00000000 996.20260939 B-2 0.00000000 0.00000000 5.19948341 0.00000000 996.20260888 B-3 0.00000000 0.00000000 5.19948425 0.00000000 996.20260800 B-4 0.00000000 0.00000000 5.19948169 0.00000000 996.20261056 B-5 0.00000000 0.00000000 5.19948486 0.00000000 996.20260739 B-6 0.00000000 0.00000000 5.19948566 0.00000000 996.20259529 (6) Amount Does Not Include Excess Special Hazard, Bankruptcy,or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

J.P. MORGAN ACCEPTANCE CORPORATION I
(Exact name of registrant as specified in its charter)
Delaware	333-109775	13-3475488
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)
270 Park Avenue New York, New York 10017
(Address of Principal Executive Offices) (Zip Code)
Registrant’s telephone number, including area code (212) 834-3850

~~Check~~CERTIFICATEHOLDER ~~the~~ACCOUNT ~~appropriate~~STATEMENT ~~box~~CERTIFICATE ~~below~~ACCOUNT ifBeginning ~~the~~Balance ~~Form~~0.00 ~~8-K~~Deposits ~~filing~~Payments isof ~~intended~~Interest toand ~~simultaneously~~Principal ~~satisfy~~11,593,702.62 ~~the~~Liquidations, ~~filing~~Insurance ~~obligation~~Proceeds, Reserve Funds 0.00 Proceeds from Repurchased Loans 0.00 Other Amounts (Servicer Advances) 0.00 Realized Loss (Gains, Subsequent Expenses & Recoveries) 0.00 Prepayment Penalties 0.00 Total Deposits 11,593,702.62 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of ~~the~~Service ~~registrant~~Fee ~~under~~83,071.36 ~~any~~Payment of ~~the~~Interest ~~following~~and ~~provisions:~~Principal 11,510,631.26 Total Withdrawals (Pool Distribution Amount) 11,593,702.62 Ending Balance 0.00

~~[ ]~~PREPAYMENT/CURTAILMENT ~~Written~~INTEREST ~~communications~~SHORTFALL ~~pursuant~~Total toPrepayment/Curtailment ~~Rule~~Interest ~~425~~Shortfall ~~under~~0.00 ~~the~~Servicing ~~Securities~~Fee ~~Act~~Support ~~(17~~0.00 ~~CFR~~Non-Supported ~~230~~Prepayment/Curtailment Interest Shortfall 0.~~425)~~00

~~[ ]~~SERVICING ~~Soliciting~~FEES ~~material~~Gross ~~pursuant~~Servicing toFee ~~Rule~~83,071.36 ~~14a-12~~Supported ~~under~~Prepayment/Curtailment ~~the~~Interest ~~Exchange~~Shortfall ~~Act~~0.00 ~~(17~~Net ~~CFR~~Servicing ~~240~~Fee 83,071.~~14a-12)~~36

~~[ ]~~LOAN ~~Pre-commencement~~STATUS ~~communications~~STRATIFICATION/CREDIT ~~pursuant~~ENHANCEMENT toSTATEMENT ~~Rule~~DELINQUENCY ~~14d~~STATUS DELINQUENT BANKRUPTCY FORECLOSURE REO Total No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-~~2(b)~~29 ~~under~~Days ~~the~~3 ~~Exchange~~0 ~~Act~~0 (3 435,224.36 0.00 0.00 435,224.36 30 Days 21 1 0 0 22 4,928,371.17 ~~CFR~~163,541.87 ~~240~~0.~~14d-~~00 0.00 5,091,913.04 60 Days 2~~(b))~~ 0 0 0 2 341,072.98 0.00 0.00 0.00 341,072.98 90 Days 2 0 0 0 2 947,277.07 0.00 0.00 0.00 947,277.07 120 Days 2 1 0 0 3 224,494.82 79,966.38 0.00 0.00 304,461.20 150 Days 1 0 0 0 1 571,435.46 0.00 0.00 0.00 571,435.46 180+ Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 28 5 0 0 33 7,012,651.50 678,732.61 0.00 0.00 7,691,384.11 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0.162690% 0.000000% 0.000000% 0.162690% 0.111721% 0.000000% 0.000000% 0.111721% 30 Days 1.138829% 0.054230% 0.000000% 0.000000% 1.193059% 1.265100% 0.041981% 0.000000% 0.000000% 1.307080% 60 Days 0.108460% 0.000000% 0.000000% 0.000000% 0.108460% 0.087553% 0.000000% 0.000000% 0.000000% 0.087553% 90 Days 0.108460% 0.000000% 0.000000% 0.000000% 0.108460% 0.243163% 0.000000% 0.000000% 0.000000% 0.243163% 120 Days 0.108460% 0.054230% 0.000000% 0.000000% 0.162690% 0.057627% 0.020527% 0.000000% 0.000000% 0.078154% 150 Days 0.054230% 0.000000% 0.000000% 0.000000% 0.054230% 0.146686% 0.000000% 0.000000% 0.000000% 0.146686% 180+ Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 1.518438% 0.271150% 0.000000% 0.000000% 1.789588% 1.800129% 0.174229% 0.000000% 0.000000% 1.974358%

~~[ ]~~Delinquency ~~Pre-commencement~~Status ~~communications~~By ~~pursuant~~Groups toDELINQUENT ~~Rule~~BANKRUPTCY ~~13e~~FORECLOSURE REO Total 1 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-~~4(c)~~29 ~~under~~Days ~~the~~3 ~~Exchange~~0 ~~Act~~0 (3 435,224.36 0.00 0.00 435,224.36 30 Days 17 ~~CFR~~1 ~~240~~0 0 18 3,172,603.~~13e~~37 163,541.87 0.00 0.00 3,336,145.24 60 Days 2 0 0 0 2 341,072.98 0.00 0.00 0.00 341,072.98 90 Days 1 0 0 0 1 199,819.19 0.00 0.00 0.00 199,819.19 120 Days 2 1 0 0 3 224,494.82 79,966.38 0.00 0.00 304,461.20 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 22 5 0 0 27 3,937,990.36 678,732.61 0.00 0.00 4,616,722.97 0-29 Days 0.188324% 0.000000% 0.000000% 0.188324% 0.162506% 0.000000% 0.000000% 0.162506% 30 Days 1.067169% 0.062775% 0.000000% 0.000000% 1.129944% 1.184599% 0.061064% 0.000000% 0.000000% 1.245663% 60 Days 0.125549% 0.000000% 0.000000% 0.000000% 0.125549% 0.127351% 0.000000% 0.000000% 0.000000% 0.127351% 90 Days 0.062775% 0.000000% 0.000000% 0.000000% 0.062775% 0.074609% 0.000000% 0.000000% 0.000000% 0.074609% 120 Days 0.125549% 0.062775% 0.000000% 0.000000% 0.188324% 0.083823% 0.029858% 0.000000% 0.000000% 0.113681% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 1.381042% 0.313873% 0.000000% 0.000000% 1.694915% 1.470382% 0.253428% 0.000000% 0.000000% 1.723810% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 2 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 4~~(c))~~ 0 0 0 4 1,755,767.80 0.00 0.00 0.00 1,755,767.80 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 1 0 0 0 1 747,457.88 0.00 0.00 0.00 747,457.88 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 1 0 0 0 1 571,435.46 0.00 0.00 0.00 571,435.46 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 6 0 0 0 6 3,074,661.14 0.00 0.00 0.00 3,074,661.14 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.593625% 0.000000% 0.000000% 0.000000% 1.593625% 1.442192% 0.000000% 0.000000% 0.000000% 1.442192% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.398406% 0.000000% 0.000000% 0.000000% 0.398406% 0.613964% 0.000000% 0.000000% 0.000000% 0.613964% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.398406% 0.000000% 0.000000% 0.000000% 0.398406% 0.469379% 0.000000% 0.000000% 0.000000% 0.469379% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 2.390438% 0.000000% 0.000000% 0.000000% 2.390438% 2.525534% 0.000000% 0.000000% 0.000000% 2.525534%

~~Item~~OTHER 8INFORMATION Current Period Class A Insufficient Funds 0.0100 Principal Balance of Contaminated Properties 0. ~~Other~~00 ~~Events~~Periodic Advance 45,345.95

OnCREDIT ~~January~~ENHANCEMENT ~~28,~~Original ~~2005,~~$ ~~J.P.~~Original ~~Morgan~~% ~~Acceptance~~Current ~~Corporation~~$ ICurrent ~~(the~~% ~~“Company”)~~Bankruptcy ~~entered into a Pooling and Servicing Agreement dated as of January 1~~100,000.00 ~~2005~~0.02377574% ~~(the “Pooling and Servicing Agreement”)~~100,000.00 by0.02568703% ~~and~~Fraud ~~among the Company~~8, ~~as depositor~~411,934.00 ~~Wells~~1.99999954% ~~Fargo Bank Minnesota~~8, ~~National Association~~411,934.00 as2.16077606% ~~master~~Special ~~servicer~~Hazard ~~(in such capacity~~4, ~~the “Master Servicer”) and securities administrator (in such capacity~~205,967.00 ~~the “Securities Administrator”), and U~~0.S.99999977% ~~Bank National Association~~4, ~~as trustee (the “Trustee”)~~205, ~~providing for the issuance of J~~967.P.00 ~~Morgan Mortgage Trust 2005-S1 Mortgage Pass-Through Certificates~~1.08038803% ~~The~~Limit ~~Pooling~~of ~~and~~Subordinate's ~~Servicing~~Exposure ~~Agreement~~to isCertain ~~annexed~~Types ~~hereto~~of ~~as Exhibit 99.1.~~Losses

~~Item~~COLLATERAL 9STATEMENT Collateral Description Mixed Fixed Ratio Strip Weighted Average Gross Coupon 6.478384% Weighted Average Pass-Through Rate 6.228384% Weighted Average Maturity(Stepdown Calculation ) 353 Beginning Scheduled Collateral Loan Count 1,880 Number Of Loans Paid In Full 36 Ending Scheduled Collateral Loan Count 1,844 Beginning Scheduled Collateral Balance 398,742,547.13 Ending Scheduled Collateral Balance 389,301,517.19 Ending Actual Collateral Balance at 29-Apr-2005 389,563,888.76 Monthly P &I Constant 2,537,366.71 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 0.00 Cumulative Realized Loss 0.00 Class A Optimal Amount 11,330,560.01 Class AP Deferred Amount 0. ~~Financial~~00 ~~Statements~~Scheduled ~~and~~Principal ~~Exhibits~~384,693.99 Unscheduled Principal 9,056,335.95

~~(a) Financial~~Group ~~statements~~Level Collateral Statement Group 1 2 Total Collateral Description Mixed Fixed Ratio Strip Mixed Fixed Ratio Strip Mixed Fixed Ratio Strip Weighted Average Coupon Rate 6.456707 6.524782 6.478384 Weighted Average Net Rate 6.206707 6.274782 6.228384 Weighted Average Maturity 353 352 353 Beginning Loan Count 1,618 262 1,880 Loans Paid In Full 25 11 36 Ending Loan Count 1,593 251 1,844 Beginning Scheduled Balance 271,770,243.55 126,972,303.58 398,742,547.13 Ending scheduled Balance 267,649,630.81 121,651,886.38 389,301,517.19 Record Date 04/29/2005 04/29/2005 04/29/2005 Principal And Interest Constant 1,722,745.64 814,621.07 2,537,366.71 Scheduled Principal 260,461.71 124,232.28 384,693.99 Unscheduled Principal 3,860,151.03 5,196,184.92 9,056,335.95 Scheduled Interest 1,462,283.93 690,388.79 2,152,672.72 Servicing Fees 56,618.80 26,452.56 83,071.36 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee 0.00 0.00 0.00 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 0.00 0.00 0.00 Pool Insurance Fee 0.00 0.00 0.00 Spread Fee 1 0.00 0.00 0.00 Spread Fee 2 0.00 0.00 0.00 Spread Fee 3 0.00 0.00 0.00 Net Interest 1,405,665.13 663,936.23 2,069,601.36 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.00 0.00 Percentage of ~~businesses~~Cumulative ~~acquired:~~Losses 0.0000 0.0000 0.0000 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00 Pass-Through Rate 6.206707 6.274782 6.228384

~~Not~~Miscellaneous ~~applicable~~Reporting Group 1 Senior % 1-1 94.367448% Senior % 1-2 94.295107% Senior Prepayment % 1-1 100.000000% Senior Prepayment % 1-2 100.000000% Junior % 1-1 5.632552% Junior % 1-2 5.704893% Junior Prepayment % 1-1 0.000000% Junior Prepayment % 1-2 0.000000% Group 2 Senior % 2-1 94.206352% Senior % 2-2 94.006740% Senior Prepayment % 2-1 100.000000% Senior Prepayment % 2-2 100.000000% Junior % 2-1 5.793648% Junior % 2-2 5.993260% Junior Prepayment % 2-1 0.000000% Junior Prepayment % 2-2 0.000000%

(b) Pro forma financial information:

Not applicable.

Exhibit No.

Description

99.1

The Pooling and Servicing Agreement, dated as of January 1, 2005, by and among the Company, the Master Servicer, the Securities Administrator and the Trustee.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

J.P. MORGAN ACCEPTANCE CORPORATION I

By: /s/Brian Simons

Name: Brian Simons

Title: Vice President

Dated: March 2, 2005

Exhibit Index

99.1

The Pooling and Servicing Agreement

Filing Compare · J.P. Morgan Mortgage Trust 2005-S1