Self Assessment checklist for sole traders

A good Self Assessment starts long before the return is submitted. The goal is to build a complete, consistent picture of your business income and costs.

1. Gather all business income

Collect sales invoices, platform statements, bank receipts and any cash-income records for the relevant tax year. Reconcile them so missing invoice numbers or duplicated receipts can be investigated.

2. Organise business expenses

Group receipts and payments into sensible categories. Keep evidence and note any costs that have mixed business and personal use rather than assuming the whole amount is deductible.

3. Check other sources of income

Your return may also need employment income, bank interest, dividends, property income or gains. Make a list early so nothing is discovered at the last minute.

4. Review tax already paid

Gather PAYE information, CIS statements and details of payments on account. These amounts can affect what remains payable.

5. Ask questions before filing

Unusual purchases, home-working costs, vehicle use and changes in the business are worth discussing. Keep a short questions list alongside your records.

This guide is general information and is not personal tax advice. Tax treatment depends on individual circumstances and current rules.