Self-employed tax calculator (2026/27)
Estimate annual Income Tax, Class 4 NI and take-home profit for a sole trader.
Enter your figures
2026/27 estimate for England, Wales or Northern Ireland. Check the scope and assumptions below.
- Annual Income Tax (all entered income)
- £4,486.00
- Employee NI on salary
- £0.00
- Class 4 NI on trading profit
- £1,345.80
- Tax and Class 4 reserve for trading profit
- £5,831.80
- Total estimated annual take-home
- £29,168.20
- Estimated monthly equivalent
- £2,430.68
What this estimate includes
This tool models one year of positive taxable trading profit in England, Wales or Northern Ireland, with no other income, pension or student loan. It excludes voluntary Class 2, losses, reliefs, payments on account, VAT and company taxation.
Method and assumptions
The standard Personal Allowance is reduced where applicable above £100,000. Class 4 is 6% on profit between £12,570 and £50,270 and 2% above that. Your employment salary does not use up the Class 4 profit threshold; mixed-income NI maximum adjustments require separate review.
Read the related explanation and check the next steps.
Sources and review
AfterTaxUK Editorial Team · reviewed 22 October 2026. A review date is separate from live deployment. Check your own records and current official guidance for individual decisions.
Frequently Asked Questions
Clear answers based on official HMRC rules and statutory guidance.
Recommended Resources
Related Calculators, Salaries & Guides
Explore connected UK tax tools, popular salary benchmarks, and statutory HMRC guidance.
Related Calculators
All CalculatorsTake-Home Pay Calculator
Calculate exact net salary with 2026/27 HMRC tax bands.
Hourly Wage Calculator
Convert hourly pay to weekly, monthly, and annual take-home.
Pro Rata Salary Calculator
Part-time, term-time, and holiday pay formulas for 2026/27.
Second Job Tax Calculator
Calculate take-home pay across two jobs with BR tax code.
Compare Common UK Salaries
All Salary BracketsStatutory Tax Guides & Blog
Visit Blog HubProfit, not turnover
Enter business profit after the expenses or allowance treatment supported by the tool. Sole-trader profit is assessed through Self Assessment and has different National Insurance rules from employment pay.
Trading allowance and actual expense deductions are alternatives for the same income. Scottish Income Tax, losses, other income, payments on account and Class 1/Class 4 interaction can need a fuller calculation.
Check the rules for your circumstances
Official guidance supports the rules described here; it does not approve or certify this calculator. Confirm dates, eligibility and unsupported cases before making a financial decision.