EXHIBIT 12.1 PACCAR Financial Corp. COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES PURSUANT TO SEC REPORTING REQUIREMENTS (Thousands of Dollars) Three Months Ended March 31 1999 1998 ------- ------- FIXED CHARGES Interest expense $30,303 $25,949 Portion of rentals deemed interest 207 76 ------- ------- TOTAL FIXED CHARGES $30,510 $26,025 ------- ------- ------- ------- EARNINGS Income before taxes $12,545 $11,791 Fixed charges 30,510 26,025 ------- ------- EARNINGS AS DEFINED $43,055 $37,816 ------- ------- ------- ------- RATIO OF EARNINGS TO FIXED CHARGES 1.41x 1.45x The method of computing the ratio of earnings to fixed charges shown above complies with SEC reporting requirements but differs from the method called for in the Support Agreement between the Company and PACCAR. See Exhibit 12.2. -12-