This Practice Note is about the right to interest on repayments of overpaid tax, whether under a statutory regime, the common law of restitution, or EU law (including retained EU law). It covers direct taxes and VAT. This Practice Note also discusses the corporation tax charge on restitution interest, and historic EU law rights to damages in respect of tax overpaid before 31 December 2020. This Practice Note was produced in partnership with Etienne Wong and Shane O’Driscoll of Old Square Tax Chambers.