Exhibit 12(a)

PACCAR Financial Corp.

COMPUTATION OF RATIO OF EARNINGS TO FIXED
CHARGES

PURSUANT TO SEC REPORTING REQUIREMENTS (1)

(Millions of Dollars)



|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|---------------------------------- |  | ---------------------- | ----- |  | ---- | - | ----- | ---- |  | - | ----- |  |  | ---- | ----- |  |  | - | ----- | 
|                                   |  | Year ended December 31 |      
|                                   |  | 2010                   |       |  | 2009 |   |       | 2008 |  |   | 2007  |  |  | 2006 |      
|FIXED CHARGES                      |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|Interest expense                   |  | $                      | 90.5  |  |      | $ | 126.2 |      |  | $ | 160.1 |  |  | $    | 199.0 |  |  | $ | 163.9 | 
|Portion of rentals deemed interest |  |                        | 1.7   |  |      |   | 1.7   |      |  |   | 1.7   |  |  |      | 1.6   |  |  |   | 1.5   | 
|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|                                   |  |                        |       |  |     
|TOTAL FIXED CHARGES                |  | $                      | 92.2  |  |      | $ | 127.9 |      |  | $ | 161.8 |  |  | $    | 200.6 |  |  | $ | 165.4 | 
|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|                                   |  |                        |       |  |     
|EARNINGS                           |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|Income before taxes                |  | $                      | 63.2  |  |      | $ | 44.8  |      |  | $ | 71.6  |  |  | $    | 133.4 |  |  | $ | 136.3 | 
|FIXED CHARGES                      |  |                        | 92.2  |  |      |   | 127.9 |      |  |   | 161.8 |  |  |      | 200.6 |  |  |   | 165.4 | 
|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|                                   |  |                        |       |  |     
|EARNINGS AS DEFINED                |  | $                      | 155.4 |  |      | $ | 172.7 |      |  | $ | 233.4 |  |  | $    | 334.0 |  |  | $ | 301.7 | 
|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 
|                                   |  |                        |       |  |     
|RATIO OF EARNINGS TO FIXED CHARGES |  |                        | 1.69x |  |      |   | 1.35x |      |  |   | 1.44x |  |  |      | 1.67x |  |  |   | 1.82x | 
|                                   |  |                        |       |  |      |   |       |      |  |   |       |  |  |      |       |  |  |   |       | 



|(1) | 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 as shown in Exhibit 12(b).
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