P800 Tax Calculations & Tax Refunds

Received a P800 or Simple Assessment letter from HMRC? Learn why HMRC sends them, how to check the calculation, how to claim a refund quickly and safely, how underpaid tax is usually collected through your tax code, and how to spot fake tax refund messages.

This course gives general information only. It is not financial, tax or legal advice, and Tutwoo is not authorised by the Financial Conduct Authority to give financial advice. Figures and rules were checked against official sources on 30 October 2026 and can change. For help with your own situation, use free guidance from MoneyHelper or speak to a regulated adviser.

© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.