File a UK Self Assessment tax return
Articles explain general principles and are for information only. They do not constitute legal, tax or other professional advice. Real outcomes depend on residence, income structure, documents and timing.
Start case analysisSelf-employed or additional income? Register, get a UTR, and file online.
- Register for SA
- Get UTR
- File online and pay/refund
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.
Tips
- Keep records for at least 5 years after the filing deadline
If you need clarity for your exact situation, the AI analysis organises your facts, applies the relevant cross-border rules, and identifies what may apply to you. A verified EU expert can review the structured case and issue a written conclusion.
Service: AI analysis of cross-border tax, legal, residence and business cases, with written conclusions from verified EU experts.
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FAQ
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.
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AI assistant – Taxes & Cross-Border Tax
