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Registering for Self Assessment with HMRC if you need to file a tax return.
You must register for Self Assessment by 5 October following the end of the tax year in which you need to file. Registration is done online through HMRC's website. Once registered, you receive a Unique Taxpayer Reference (UTR) number and can file your return online. You need to register if you are self-employed, a landlord, earn over £10,000 from savings/investments, or have other complex tax affairs.
This definition is for informational purposes only and does not constitute tax, legal, or financial advice. Rules may change and outcomes depend on your circumstances.
These GOV.UK and HMRC sources provide the official context for this glossary entry. The definition is educational and does not determine your individual tax position.