Self-employed tax & NI calculator
Estimate your tax bill on self-employed profits — and what you get to keep.
Your details
| Profit | £3,333.33 |
| Income tax | −£457.17 |
| Class 4 National Insurance | −£137.15 |
| Total tax bill | £594.32 |
| Left after tax | £2,739.02 |
Want us to handle this for you?
Our accountants can run your payroll, file your tax return and make sure you never pay more than you should.
Your tax
Personal allowance: £12,570
- Basic rate (20%) on £27,430£5,486.00
Class 4 NI: 6% on profits £12,570–£50,270, 2% above. Class 2 NI is treated as paid automatically.
When you pay
Because your bill is over £1,000 you'll usually make two payments on account of about £3,565.90 each — on 31 January and 31 July — towards next year's bill, plus any balance by the following 31 January.
Making Tax Digital
With self-employment and property income over £30,000, Making Tax Digital for Income Tax applies from 6 April 2027 (based on an earlier year's income) — quarterly updates through compatible software. We can set this up for you.
Estimates only, based on 2026/27 rates for typical situations. They are not financial advice — speak to us about your own circumstances. Rates last checked: October 2026 (GOV.UK).