Free tool
Self-employed tax calculator 2026/27
Enter your self-employment profit (turnover minus allowable expenses) and we'll show your estimated Income Tax and Class 4 National Insurance for 2026/27.
Turnover minus allowable expenses, mileage and capital allowances.
This is an estimate based on 2026/27 thresholds (Personal Allowance £12,570; basic-rate band £37,700; higher-rate threshold £50,270; additional-rate threshold £125,140). Class 4 NI is 6% between £12,570 and £50,270, then 2%. Class 2 NI is no longer payable for most sole traders from 2024/25.
It does not include: other income (PAYE, savings, dividends), Scottish/Welsh rates, Marriage Allowance, student loan repayments, pension contributions, or capital gains. For an exact figure, file your Self Assessment or speak to your accountant.
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- Making Tax Digital for Income Tax: what April 2026 actually means for UK sole traders
- Voice invoicing: how UK tradespeople send a legal invoice from the van in under 30 seconds
- Allowable expenses for UK sole traders: the HMRC categories explained