The Complete UK Self Assessment Guide
Self Assessment is how HMRC collects tax that is not taken automatically through PAYE. If you are self-employed, a company director, a landlord, or you have side income, you probably need to file a return. This guide pulls the essentials together in plain English and links to detailed articles, with the key dates so nothing catches you out.

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Browse the guide
Understanding personal tax rates ↗
Income tax bands, National Insurance, dividends and savings.
How to register for Self Assessment ↗
The 5 October deadline, the steps, and getting your UTR.
Payments on account ↗
What the 31 July deadline means, and how to reduce it.
Is this you?
- Sole traders and the self-employed who file their own return.
- Landlords and anyone with income outside of PAYE.
- Company directors who need to file Self Assessment.
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