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HMRC internal manual

Excise Assessments Interim Guidance

HM Revenue & Customs
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Time limits for section 12(1) and 12(1A) FA1994 assessments to excise duty: One, four and twenty year rules

The time limits for assessments to excise duty under sections 12(1) and 12(1A) of the Finance Act 1994 are prescribed by section 12(4).

These are commonly known as the one and four year rules. A twenty-year rule may apply to assessments in certain cases.