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Overpayment relief allows a claim to be made within four years after the end of See HMRC's Self-Assessment Claims manual at SACM12057 there "Understated HMRC guidance on overpayment relief. HMRC's guidance can be found in the Self-Assessment Compliance Manual and in HMRC Brief 22/102.Overpayment relief – Technical information on HMRC website gov.uk/hmrc-internal-manuals/self-assessment-claims-manual/sacm12000.