Basis of Presentation

3 Months Ended

Mar. 31, 2012

Basis of Presentation

NOTE A – Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2012 are not necessarily indicative of the results that may be expected for the year ending December 31, 2012. For further information, refer to the consolidated financial statements and footnotes included in PACCAR Inc’s (the Company) Annual Report on Form 10-K for the year ended December 31, 2011.

Earnings per Share: Basic earnings per common share are computed by dividing earnings by the weighted average number of common shares outstanding, plus the effect of any participating securities. Diluted earnings per common share are computed assuming that all potentially dilutive securities are converted into common shares under the treasury stock method. The dilutive and antidilutive options are shown separately in the table below.

	Three Months Ended
	March 31
	2012		2011
Additional shares		829,500		1,362,000
Antidilutive options		2,571,900		829,500

New Accounting Pronouncements: In May 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-04, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs. While many of the amendments are clarifications to the existing guidance and are intended to align U.S. GAAP and International Financial Reporting Standards (IFRS), the ASU changes some fair value measurement principles and disclosure requirements. The Company adopted ASU 2011-04 in the first quarter of 2012; the implementation of this amendment resulted in additional disclosures (see note J), but did not have a significant impact on the Company’s consolidated financial statements.

The FASB issued ASU 2011-05, Presentation of Comprehensive Income, in June 2011, which was subsequently amended by ASU 2011-12 in December 2011. The new guidance requires entities to present components of net income and comprehensive income in either a combined financial statement or in two separate but consecutive statements of net income and comprehensive income. The Company adopted ASU 2011-05 as amended in the first quarter of 2012 and has elected to present components of net income combined with a total for comprehensive income in a single continuous statement in its consolidated interim financial statements. The Company is currently evaluating which method to adopt in the consolidated annual financial statements.