Sections 86 and 88(1), (4) and (5)(a) and (b) of the Taxes Management Act 1970 (interest on amounts overdue, and on tax recovered to make good loss due to taxpayer’s fault) shall apply in relation to any amount due in respect of Class 4 contributions as they apply in relation to income tax; and section 824 of the Act of 1988 (repayment supplements) shall, with the necessary modifications, apply in relation to Class 4 contributions as it applies in relation to income tax.

The Inland Revenue shall have the same powers under section 1 of the Taxes Management Act 1970 (general functions of care and management) in relation to the remission of interest payable under section 86 or 88 of that Act by virtue of this paragraph as they have in relation to the remission of interest payable under either of those sections on tax.