P800 Refund Guide: How to Claim a UK Tax Refund Safely

A P800 is a tax calculation from HMRC. In some cases it shows that you paid too much tax during the tax year, which can mean you are due a refund. In other cases it can show that too little tax was paid, so it is worth reading the calculation carefully instead of assuming it always means money back.

For many readers, the first concern is whether the letter is genuine and whether a refund can really be claimed online. A sensible approach is to confirm what the document is, check the tax year and amount shown, and then move to either the P800 explainer or the step-by-step claim page depending on what you need next.

• P800 calculation: a summary of your tax position, not a payment itself.
• Overpayment: you may be due a refund from HMRC.
• Underpayment: you may still owe tax, so read the wording carefully.

A safe approach is to confirm what a P800 is, review how the claim process usually works, and then check the correct GOV.UK route directly. This reduces the risk of acting on copied links, scam texts or unofficial pages that only look convincing at first glance.

• Read the tax calculation carefully and note whether it shows a refund or an underpayment.
• Use trusted GOV.UK guidance if you want to continue online.
• Keep a record of dates if you are waiting for HMRC to issue a letter or payment.

If you have only just opened the letter, start with the tax year, the amount shown and any instructions about claiming or waiting for repayment. Those details help you decide whether you need the refund guide, the online claim guide or the timing page next.

• Check that the document refers to the correct tax year.
• Check whether it shows an overpayment or underpayment.
• Check whether HMRC has already told you what the next step should be.

The first release of this site focuses on the questions readers usually ask first: what a P800 is, how to claim safely, where to find the correct GOV.UK page, and how long the process may take. You can start with the main guide if you want the full overview, or jump straight to timing if you are waiting for HMRC to issue a letter or payment.

This is an independent information site built to make official guidance easier to understand. You can read more about the editorial approach on the About page and the boundary of the service on the Disclaimer page.