Preparing early for Self Assessment reduces the risk that a missing record is discovered close to a deadline. This checklist helps organise the work; it does not decide the tax treatment of an item.
Web checklist
- [ ] Identify the relevant return deadline and any urgent missing information first.
- [ ] Gather sales or income records, business expenses and supporting evidence.
- [ ] Reconcile bank, card and cash records to the period being reviewed.
- [ ] List other income, reliefs, payments on account or unusual transactions that may need separate review.
- [ ] Keep a query list with an owner and date rather than guessing an answer.
- [ ] Retain the submitted return, computation and supporting records securely.
Download
Use the editable or printable checklist to keep a clear record of what has been gathered and what remains open.
Next step
Use the printable checklist to collect evidence early and list any missing figures before a deadline is close.
Important
General information only. Check the current official guidance for the business’s circumstances.
Sources and review
- Evidence check date: 5 November 2026.
- GOV.UK - Self Assessment tax returns