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HMRC internal manual

PAYE Manual

HM Revenue & Customs
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Employer returns: regulation 80 determinations: time limits and appeals: regulation 80(5): parts IV and V TMA 1970

The rules about time limits and appeals apply to a determination in the same way as an assessment, so you should apply them as if you had assessed the employer.

You may sometimes need to determine tax for a year outside the ordinary time limit.

Section 36 TMA1970 provides the authority for determinations outside the ordinary time limits at Section 34 TMA1970, where there has been a loss of tax attributable to careless and deliberate conduct.

COG914175 contains advice about determinations made outside of the Ordinary Time Limits.