File a UK Self Assessment tax return

Have a HMRC letter? Private by default · No signup to try

Self-employed or additional income? Register, get a UTR, and file online.

Steps

Register

Create a Government Gateway account and register for Self Assessment.
UTR

Wait for your 10-digit UTR by post; add it to your account.
File

Enter income/expenses; submit and pay by the deadline.

Quick links

Guides

Online filing by 31 Jan following the tax year; payments on account may apply.

Typically ID and proof related to the procedure (e.g., address, income or ownership). Check the official site for country-specific lists.

Often yes via the official portal (GOV.UK or your council/NHS portal). Some steps still require in‑person verification or mailing originals.

Processing times vary by city and season. Plan for days to a few weeks; start early before deadlines.