Self-employed tax calculator UK 2026/27
Estimate sole trader Income Tax and Class 4 National Insurance for 2026/27. Enter taxable trading profit and choose the correct UK country tax bands.
Enter your figures
Income Tax and Class 4 NI
Inputs changed. Select Calculate result to update your estimate.
2026/27 annual estimate for a UK resident with only this income, the standard Personal Allowance and no special reliefs. Includes the allowance taper above £100,000. Choose your country for tax purposes. Excludes savings, dividends and pension deductions. Profit must already be after allowable expenses or any trading allowance. No other employment, losses, student loans, voluntary Class 2 or payments on account. Assumes Class 4 applies.
How the self-employed tax calculator uk 2026/27 works
Income Tax on taxable profit plus Class 4: 6% on £12,570–£50,270 and 2% above.
UK data and rules
2026/27 data · Checked 16 October 2026. Rules are a dated snapshot, not a live feed.
- HMRC — Income Tax rates and allowances
- HMRC — Scottish Income Tax
- HMRC — Self-employed National Insurance
Read about data coverage and updates
Worked example: sole trader tax
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Annual taxable trading profit (£)
- 40,000
- Country for tax purposes
- England
Income Tax and Class 4 NI: £7,131.80
Income Tax on taxable profit plus Class 4: 6% on £12,570–£50,270 and 2% above.
Sole trader tax: questions answered
Do I enter turnover or profit for sole trader tax?
Enter taxable trading profit after allowable expenses or the applicable trading allowance. Turnover alone does not show the amount on which this Income Tax and Class 4 model is based.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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