451.This section deals with two areas where there may be a mismatch between periods of account.
452.First, a company will account for income tax, National Insurance contributions and student loan repayments for which it is responsible as an employer for a year of assessment, but its own corporation tax liability will be determined by reference to its accounting period, which is usually different.
453.Second, self employed people are taxed by reference to years of assessment but Class 2 National Insurance contributions are calculated for each week of self employment and due quarterly in arrears.
454.This section ensures that the Director can only take over the functions which a company is responsible for as an employer and Class 2 National Insurance contributions of the self-employed where the relevant periods for those matters fall wholly within a period or periods for which the Director has served a notice under section 317.