Overpayments and underpayments
Services
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Use this tool to find out what you need to do to get a tax refund (rebate) if you’ve paid too much Income Tax.
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What to do if you need to pay more tax or you're due a refund, including P800 tax calculations from HM Revenue and Customs (HMRC).
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Use HM Revenue and Customs’ (HMRC) tax checker to get an estimate of how much Income Tax you should have paid in a previous tax year.