Answers · UK 2025/26
How do I claim a P800 tax refund from HMRC?
If HMRC calculates that you've overpaid tax, they send a P800 calculation after the tax year ends. You can claim the refund online at gov.uk within 45 days, or HMRC will send a cheque within 21 days automatically. You have 4 years from the end of the tax year to claim earlier overpayments.
Full answer
A P800 is a "tax calculation" letter sent by HMRC — usually between June and November after the tax year ends (5 April) — to PAYE employees and pensioners who may have overpaid or underpaid tax. It is not a self assessment return; it is an HMRC-calculated estimate. **Why you might receive a P800:** - You had multiple jobs or pension sources in the year. - You were put on an emergency tax code (e.g. BR or W1/M1) for part of the year. - You left work or retired part-way through the year. - Benefits in kind were incorrectly taxed. **If it shows a refund:** 1. Log in to your Personal Tax Account at gov.uk/check-income-tax. 2. Check the calculation is correct — if you spot an error, contact HMRC before claiming. 3. Click "Claim your tax refund online" — funds arrive in your bank account within 5 working days. 4. If you do nothing within 45 days, HMRC sends a cheque automatically — allow 21 days. **Earlier years:** You can claim overpaid tax going back 4 years (so in the 2026/27 tax year, you can claim back to 2022/23). Use the R40 form for repayment claims if you did not receive a P800. **If it shows tax owed:** For underpayments below £3,000, HMRC typically collects the amount through your tax code the following year. Larger amounts require direct payment. **Watch for scams:** HMRC never emails or texts you about a tax refund without prompting — unsolicited "HMRC refund" messages are almost always phishing attempts.
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.