Free calculator · 2026/27
Self-employed tax calculator: income tax and NIC.
Work out the income tax and Class 4 National Insurance on your self-employed profit and see your take-home pay and how much to set aside each month.
- Updated for 2026/27 rates
- Free, no sign-up
- Instant results
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Tax year
2026/27
Rates last reviewed November 2026
Open the calculator ↓Free · No sign-up · Estimates only
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What this calculator includes
It applies the 2026/27 personal allowance, the 20%, 40% and 45% income tax bands, and Class 4 National Insurance at 6% and 2%. You can add a student loan and a personal pension contribution.
Setting money aside
Self-employed people pay tax through Self Assessment, often with payments on account. Setting aside a share of every payment keeps you ready for the January bill.
Worked example
See it with real numbers
On a profit of £40,000, income tax is £5,486 and Class 4 NIC is £1,646. That is £7,132 in total, leaving take-home of £32,868, or about £2,739 a month.
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Want your tax return done for you?
Fixed-fee Self Assessment from £149 + VAT, filed with HMRC.
FAQs
Self-Employed Tax Calculator: your questions answered
Short, straight answers. Still unsure? Call us on 020 3441 1258.
About £5,486 income tax plus £1,646 Class 4 NIC in 2026/27, a total of around £7,132, before any student loan or pension.
Class 2 is no longer compulsory. You can pay voluntarily to protect your State Pension record.
Advance payments towards next year’s tax bill, usually due on 31 January and 31 July.
Yes, our Self Assessment package starts at £149 + VAT and is paid online.
Let us handle the tax for you
Fixed fees, paid online. Call 020 3441 1258 or get your quote now.
Prices last reviewed November 2026. Cheap Accountants in London is a trading style of ACCOTAX London Ltd.