Self-Employed Tax Calculator UK
Work out the income tax and Class 4 National Insurance you'll owe on your self-employment profit for 2026/27. Enter your profit after expenses to see your total bill and net profit.
Calculator
What this means
Sole traders pay income tax on profits above the personal allowance, plus Class 4 National Insurance at 6% on profits between £12,570 and £50,270 and 2% above. Class 2 NI is no longer required if your profits are above the small profits threshold.
Frequently asked questions
You pay income tax on your profit (income minus allowable expenses) above the personal allowance, using the same bands as employees, plus Class 4 National Insurance on profits above £12,570.
From recent tax years, self-employed people with profits above the small profits threshold no longer need to pay Class 2 NI but still get the benefit entitlement. Those below may pay voluntarily.
HMRC usually asks you to pay tax in two instalments — 31 January and 31 July — each being 50% of the previous year's bill as an advance towards the next year.
Disclaimer
This calculator provides estimates for guidance only. It is not financial, legal or tax advice. Always check official sources or speak to a qualified professional before making decisions.
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