UK Self-Employed Tax Calculator 2026/27
Estimate Income Tax and Class 4 National Insurance on sole-trader profit for the 2026 to 2027 tax year (England, Wales and Northern Ireland).
2026/27 at a glance: Personal Allowance £12,570; Income Tax 20% / 40% / 45%; Class 4 NI 6% on profits £12,570–£50,270 and 2% above. On £40,000 profit the estimate is £7,131.80. Source: GOV.UK Income Tax rates, GOV.UK self-employed NI rates.
Build your scenario
Use your actual figures where available. The output is an educational estimate based on the assumptions below.
Rates used (2026 to 2027 tax year)
| Item | Rate |
|---|---|
| Personal Allowance | £12,570, reduced by £1 for every £2 of income over £100,000 (zero at £125,140) |
| Basic rate | 20% on £12,571 to £50,270 |
| Higher rate | 40% on £50,271 to £125,140 |
| Additional rate | 45% over £125,140 |
| Class 4 NI | 6% on profits £12,570 to £50,270; 2% above £50,270 |
| Class 2 NI | Not payable with profits of £7,105 or more (treated as paid); voluntary £3.65 a week below that |
Sources: GOV.UK Income Tax rates and Personal Allowances and GOV.UK Self-employed National Insurance rates, checked 21 Oct 2026. Scottish Income Tax bands differ and are not modelled. Other income, pension contributions, payments on account and student loans are not included.
Worked example
£40,000 profit: taxable income £40,000 − £12,570 = £27,430, taxed at 20% = £5,486.00. Class 4 NI: 6% × £27,430 = £1,645.80. Total £7,131.80, leaving £32,868.20.
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Frequently asked questions
How much tax do I pay on £40,000 self-employed profit?
About £7,131.80 in 2026/27: £5,486.00 Income Tax and £1,645.80 Class 4 NI, assuming no other income and the standard Personal Allowance.
What are the Class 4 NI rates for 2026/27?
6% on profits over £12,570 up to £50,270 and 2% on profits over £50,270, per GOV.UK.
Do I pay Class 2 NI?
Not if your profits are £7,105 or more; contributions are treated as paid. Below that you can choose to pay voluntary Class 2 at £3.65 a week.
Does this work for Scotland?
No. Scottish Income Tax bands are different. Class 4 NI is the same across the UK.
Educational information only; not financial, tax, legal, or investment advice.