EXHIBIT 12 CATERPILLAR FINANCIAL SERVICES CORPORATION COMPUTATION OF RATIO OF PROFIT TO FIXED CHARGES (Unaudited) (Millions of Dollars) Three Months Six Months Ended Ended June June June June 30, 30, 30, 30, 1998 1997 1998 1997 Net Income $ 25.5 $ 21.9 $ 49.3 $ 48.9 Add: Provision for income taxes 14.9 12.4 28.4 27.0 Deduct: Equity in profit of (1.5) (.7) (2.2) (1.2) partnerships Profit before taxes $ 38.9 $ 33.6 $ 75.5 $ 74.7 Fixed charges: Interest on borrowed funds $125.1 $ 87.8 $230.6 $167.3 Rentals at computed interest* 1.0 .7 1.9 1.3 Total fixed charges 126.1 $ 88.5 232.5 $168.6 Profit before taxes plus fixed 165.0 $122.1 308.0 $243.3 charges Ratio of profit before taxes plus 1.31 1.38 1.32 1.44 fixed charges to fixed charges *Those portions of rent expense that are representative of interest cost.