Tax calculator
Sole Trader Tax Calculator
Estimate Income Tax and Class 4 National Insurance on your self-employment profit.
| Income | £45,000 |
| Allowable expenses | −£5,000 |
| Taxable profit | £40,000 |
| Personal AllowanceShared across all income sources | £12,570 |
| Income TaxAttributable to self-employment profit | −£5,486 |
| Class 4 National Insurance6% between £12,570–£50,270, 2% above | −£1,646 |
| Tax & NI on this profit | £7,132 |
2026/27 rates. Class 2 NI was abolished for most self-employed people from 2024/25 (voluntary Class 2 still available to protect state pension entitlement — not included here). Assumes no student loan and standard Personal Allowance. Guidance only — not tax advice; a qualified accountant will find reliefs a calculator can't.
Figures use published 2026/27 UK tax rates and are simplified estimates for guidance only — not tax, accountancy, or financial advice. Your actual liability depends on your full circumstances; confirm withGOV.UK or a qualified accountant before acting.