Sole trader tax and record-keeping checklist
A plain-English checklist for UK sole traders covering Self Assessment, records and tax deadline reminders.
Last checked against official sources: 16 July 2026. General information only, not legal, tax or accounting advice.
Direct answer
A sole trader should keep records from the start of trading, register for Self Assessment when required, track the 5 October registration deadline where relevant, and plan for paper and online tax return deadlines.
Sole traders need clear records of business income and costs, and usually use Self Assessment to report taxable profit.
When to register
GOV.UK says you can start trading straight away, but you must register for Self Assessment as a sole trader if you earn more than GBP 1,000 in a tax year.
For a new Self Assessment obligation, HMRC usually requires registration by 5 October after the relevant tax year.
Self Assessment dates to track
For the 2025 to 2026 tax year, GOV.UK lists the paper return deadline as 31 October 2026 and the online return/payment deadline as 31 January 2027.
Keep enough money aside for tax and National Insurance, and ask HMRC or an adviser if you are unsure.
Practical checklist
- - Track sales, invoices and bank income.
- - Keep receipts and allowable expense evidence.
- - Register for Self Assessment when required.
- - Add paper and online Self Assessment deadlines.
- - Review VAT registration requirements as income grows.
Common mistakes
- - Forgetting the 5 October registration point.
- - Mixing personal and business records without notes.
- - Waiting until January to gather a full year of evidence.
FAQs
Do sole traders use Corporation Tax?
No. GOV.UK says sole traders and partnerships use Self Assessment, not a Company Tax Return.
Official sources
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