EXHIBIT 12 NAC RE CORP. AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (Dollars in Thousands) Year Ended December 31, -------------------------------------------------------------- 1997 1996 1995 1994 1993 ---------- --------- --------- --------- --------- Earnings: Operating income before income taxes $122,830 $89,036 $78,821 $42,290 $49,497 ---------- --------- --------- --------- --------- Add back fixed charges: Interest expense 21,390 21,976 15,381 14,196 13,324 Amortization of related debt expenses 345 346 267 258 258 Assumed interest component of rent expenses 1,551 1,311 1,235 1,099 1,194 ---------- --------- --------- --------- --------- Total fixed charges 23,286 23,633 16,883 15,553 14,776 ---------- --------- --------- --------- --------- Adjusted earnings $146,116 $112,669 $95,704 $57,843 $64,273 ---------- --------- --------- --------- --------- ---------- --------- --------- --------- --------- Ratio of earnings to fixed charges 6.3 to 1 4.8 to 1 5.7 to 1 3.7 to 1 4.3 to 1 ---------- --------- --------- --------- --------- ---------- --------- --------- --------- ---------