Commentary on Sections Part 2: Charge to corporation tax: basic provisions Overview
60.This Chapter gives the definition of accounting period. It is based on section 12 of ICTA.
61.The accounting period is a basic building block of corporation tax because corporation tax is charged by reference to accounting periods. For nearly all established UK resident companies the accounting period coincides with the 12 month period for which it makes up its accounts. Most of the Chapter is taken up with rules explaining what happens outside the usual case.
62.The Chapter does not rewrite section 12(8) of ICTA. Section 12(8) is an administrative provision that deals with the validity of assessments. The Chapter is concerned with when accounting periods begin and end, and not with the circumstances in which an officer of Revenue and Customs may make an assessment or determination.