Exhibit 12(a)

PACCAR Inc

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

PURSUANT TO SEC REPORTING REQUIREMENTS

(Millions of Dollars)

	Year Ended December 31,
	2012		2011		2010		2009		2008
FIXED CHARGES
Interest expense	$	163.6	$	184.3	$	218.7	$	293.7	$	391.1
Portion of rentals deemed interest		3.7		4.7		6.5		16.8		17.9
TOTAL FIXED CHARGES	$	167.3	$	189.0	$	225.2	$	310.5	$	409.0
EARNINGS
Income before taxes	$	1,628.9	$	1,506.9	$	660.3	$	175.0	$	1,464.0
Fixed Charges		160.2		180.7		215.7		308.3		409.0
EARNINGS AS DEFINED	$	1,789.1	$	1,687.6	$	876.0	$	483.3	$	1,873.0
RATIO OF EARNINGS TO FIXED CHARGES		10.69x		8.93x		3.89x		1.56x		4.58x