Answers · UK 2025/26
How do I find my UTR (Unique Taxpayer Reference)?
Your 10-digit UTR is on past Self Assessment letters from HMRC, the "Welcome to Self Assessment" letter (SA250), your Personal Tax Account at gov.uk, or call HMRC on 0300 200 3310. If you don't have one, register for Self Assessment to get one.
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Your Unique Taxpayer Reference (UTR) is a 10-digit number HMRC uses to identify you for Self Assessment. Where to find it: (1) any previous letter from HMRC about Self Assessment (e.g. SA250 welcome letter, statement of account); (2) sign in at gov.uk/personal-tax-account → Self Assessment section; (3) the HMRC app under "Self Assessment"; (4) phone the Self Assessment helpline on 0300 200 3310 (have your NI number ready); (5) write to HMRC: Self Assessment, HM Revenue and Customs, BX9 1AS. If you don't have a UTR, you need to register for Self Assessment at gov.uk/register-for-self-assessment — HMRC posts your UTR within 10 working days. Required for: filing online (alongside Government Gateway ID), self-employed sole traders, landlords, partners in a business, anyone with untaxed income over £2,500. The number stays the same for life. Limited companies have a different Company UTR.
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This answer is informational only and does not constitute financial, tax or legal advice. Figures are for the 2025/26 UK tax year. See our methodology and sources.