1 Exhibit 12.0 TRENWICK GROUP INC. COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (DOLLARS IN THOUSANDS) Year Ended December 31, ------------------------------------------------------- 1996 1995 1994 1993 1992 ---- ---- ----- ---- ---- Net Income $33,848 $29,841 $20,282 $23,739 $18,539 Income Taxes 9,980 8,572 2,753 4,220 925 SUBTOTAL 43,828 38,413 23,035 27,959 19,464 FIXED CHAGRES: Interest Expense 6,503 6,496 6,469 6,454 1,688 Deferred Debt Issuance Costs 294 276 260 244 -- Office Space & Equipment Rental 323 309 316 251 240 Total Fixed Charges 7,120 7,081 7,045 6,949 1,908 Earnings before Income Taxes and Fixed Charges $50,948 $45,494 $30,080 $34,908 $21,372 Ratio of Earnings to Fixed Charges 7.2 6.4 4.3 5.0 11.2