How-to
Self-Assessment Eligibility Check
Find out whether you need to file a UK Self Assessment tax return.
1 min readLast updated 27 April 2026
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What it does
A short wizard with 12 yes/no questions that tells you whether you likely need to file a Self Assessment tax return. You get a confidence level and suggested next steps.
How to use it
- Click "Not sure if you need to file?" on the Dashboard, or go to /self-assessment
- Answer each of the 12 yes/no questions
- Review the result — includes a confidence level (e.g. "Very likely", "Unlikely")
- Follow the suggested next steps if filing is recommended
What it covers
- Self-employment income above the Trading Allowance
- High income (over GBP 100k)
- Rental income and capital gains
- CIS (Construction Industry Scheme) and foreign income
Important
- Results are guidance only, not tax advice. Consult an accountant if unsure.
- You can re-run the wizard any time your circumstances change.
- Nothing is submitted to HMRC — it is purely informational.