# Finance Act 2026, Paragraph 24: Time limits for assessments

Extent: E+W+S+N.I.

(1) An assessment under paragraph 20 or 22 may not be made after the relevant time.
(2) Except in a case within sub-paragraph (3) the relevant time is the earlier of—
(a) the end of the period of 4 years from the end of the accounting period to which the assessment relates, or
(b) the end of the period of 1 year beginning with the day on which evidence of facts, sufficient in the opinion of the officer of Revenue and Customs making the assessment to justify making it, comes to the knowledge of any officer of Revenue and Customs.
(3) Where an assessment of an amount due from a person is made in a case involving loss of CBAM—
(a) brought about deliberately by the person, or
(b) attributable to a failure by the person to comply with a requirement of paragraph 2 or 4,
the relevant time is the end of the period of 20 years from the end of the accounting period to which the assessment relates.
(4) In sub-paragraph (3) the reference to a loss brought about by a person includes a reference to a loss brought about by another person acting on behalf of that person.

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Source: https://www.legislation.gov.uk/ukpga/2026/11/schedule/17/paragraph/24 (the official version)
Page: https://openlegislation.uk/finance-act-2026/schedule-17/paragraph-24
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.