Self-Employed Tax Calculator 2025/26
UK income tax, Class 4 National Insurance, personal-allowance taper and optional student-loan repayments. Built for sole traders.
Your numbers
Your estimate
Income tax breakdown
| Band | Rate | Amount in band | Tax |
|---|
National Insurance (Class 4)
| Band | Rate | Amount | NI |
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How this calculator works
Taxable profit = turnover − allowable expenses. Add any PAYE salary to get your total taxable income. The personal allowance is £12,570 in 2025/26, but it's reduced by £1 for every £2 you earn above £100,000 — so it's £0 once you hit £125,140.
Income tax bands (England, Wales & NI, 2025/26)
- Basic rate (20%): £12,571 – £50,270
- Higher rate (40%): £50,271 – £125,140
- Additional rate (45%): over £125,140
Class 4 National Insurance
- 6% on profits between £12,570 and £50,270
- 2% on profits above £50,270
Class 2 NI is no longer compulsory for self-employed earning above the Small Profits Threshold — your State Pension entitlement is preserved automatically. You can choose to pay £3.45 / week voluntarily if you fall below.
Student loans (2025/26)
- Plan 1 — 9% over £26,065
- Plan 2 — 9% over £28,470
- Plan 4 (Scotland) — 9% over £32,745
- Plan 5 — 9% over £25,000
- Postgraduate — 6% over £21,000
Caveats
This is a quick estimate. It assumes one tax year, no marriage allowance transfer, no payments on account, no dividend income, no gift aid relief, and that your pension contributions are within the annual allowance. For complex situations (CIS, IR35, capital allowances, second jobs, dividends) talk to a qualified accountant.
Not tax advice. Figures based on published HMRC rates for 2025/26.