EXHIBIT 12 CATERPILLAR FINANCIAL SERVICES CORPORATION COMPUTATION OF RATIO OF PROFIT TO FIXED CHARGES (Unaudited) (Millions of Dollars) Three Months Nine Months Ended Ended Sept. 30, Sept.30, Sept.30, Sept.30, 1998 1997 1998 1997 Profit $ 35.2 $ 23.0 $ 84.4 $ 71.9 Add: Provision for income taxes 21.5 13.2 50.0 40.2 Deduct: Equity in profit of partnerships (.6) (.6) (2.8) (1.9) Profit before taxes $ 56.1 $ 35.6 $131.6 $110.2 Fixed charges: Interest on borrowed funds $135.7 $96.6 $366.3 $263.9 Rentals at computed interest* 1.0 1.0 2.9 2.3 Total fixed charges $136.7 $ 97.6 $369.2 $266.2 Profit before taxes plus fixed charges $192.8 $133.2 $500.8 $376.4 Ratio of profit before taxes plus fixed charges to fixed charges 1.41 1.36 1.36 1.41 *Those portions of rent expense that are representative of interest cost.