BI CFO / United Kingdom / Self-employed tax calculator
Self-employed tax calculator
Income tax, Class 4 NI and payments on account for sole traders, 2026/27.
Enter your figures to see the result.
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Ask an accountantWorked example: £40,000 trading profit
A sole trader in England makes £40,000 of profit in 2026/27 with no other income.
| Income tax | £5,486 |
| Class 4 NI | £1,645.80 |
| Total | £7,131.80 |
| Each payment on account | £3,566 |
Common questions
What NI do self-employed people pay in 2026/27?
Class 4 at 6% on profits between £12,570 and £50,270 and 2% above. Class 2 is no longer compulsory; you can pay it voluntarily to protect State Pension entitlement if profits are below £7,105.
What are payments on account?
Advance payments towards next year’s bill, each half of this year’s tax and Class 4 NI, due 31 January and 31 July. They apply when your bill is over £1,000 and less than 80% is collected at source.
When does Making Tax Digital start for me?
From April 2026 for sole traders and landlords with qualifying income over £50,000, April 2027 over £30,000, and April 2028 over £20,000.
Read the guide
For education only. 2026/27 rates. Excludes student loans, savings and dividend income and basis-period adjustments. Not tax advice.