Using overpayment relief to recover overpaid taxes

Overpayment relief allows taxpayers to reclaim overpaid taxes relating to Income Tax, Capital Gains Tax, Class 4 National Insurance, Corporation Tax or to adjust an excessive tax assessment.

HMRC outlines the rules for overpayment relief, which aim to:

  • give a single route for persons to recover overpayments;
  • bring the claims process into line with self-assessment claims; and
  • align time limits with those for other claims.

Claims for overpayment relief must be submitted within 4 years from the end of the tax year or accounting period in question. However, claims can only be made under specific circumstances. For instance, a taxpayer may claim overpayment relief only if they have not had an opportunity to correct their tax liability through other means, such as submitting or amending a self-assessment return or appealing an HMRC assessment or amendment.

To file a claim, the taxpayer must submit a written request, clearly outlining the reason for the claim, the relevant period, and the rationale for believing that an overpayment or excessive assessment has occurred.

Source:HM Revenue & Customs | 03-02-2025