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As from 1 April 2010 this relief relaces error or mistake relief.
A individual can claim overpayment relief to reclaim income & capital gains tax as well as class 4 NIC or to reduce an excessive assessment. The claim must be made within 4 years following the end of the tax year to which the return relates.
Claims must state the amount that the individual believes they have overpaid and that they are making a claim for overpayment relief under Schedule 1AB TMA 1970. It should also show, the tax year, the grounds for the claim, whether there has already been an appeal for the year in question and if required documentary evidence of the claim. The claim should also be signed.