3(1)This paragraph applies to any amount which is due and payable as a result of—U.K.
(a)an amendment or correction to an assessment or self-assessment (“assessment A”),
(b)an assessment made by HMRC in place of or in addition to an assessment (“assessment A”) which was made by a taxpayer, or
(c)an assessment made by HMRC in place of an assessment (“assessment A”) which ought to have been made by a taxpayer.
(2)The late payment interest start date in respect of that amount is the date which would have been the late payment interest start date if—
(a)assessment A had been complete and accurate and had been made on the date (if any) by which it was required to be made, and
(b)accordingly, the amount had been due and payable as a result of assessment A.
(3)In the case of a person (“P”) who failed to give notice as required under section 7 of TMA 1970 (notice of liability to tax), the reference in sub-paragraph (1)(c) to an assessment which ought to have been made by P is a reference to the assessment which P would have been required to make if an officer of Revenue and Customs had given notice under section 8 of that Act.
(4)In this paragraph “assessment” means any assessment or determination (however described) of any amount due and payable to HMRC.