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A P800 is a letter from HMRC letting you know if you’ve overpaid or underpaid tax. If this is correct, the difference will need to be settled.

More detail:

A P800 is a document issued by HMRC that informs an individual that they have not paid the correct amount of tax. This may mean either that they have overpaid tax or they have underpaid it. P800 are usually sent out between June and October.

If you have received a P800, it is important to check that the details are correct compared to the details available on your P11D, P45, and P60 forms. It is possible to appeal with HMRC to ensure the details on a P800 are correct.

If you have overpaid, HMRC will automatically refund you the amount within 4 weeks. If you have overpaid, they will either automatically collect the tax through your Tax Code or organise a payment plan.

An extract from an example P800 form is shown below:

A photo of an extract from an example P800 Form

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