Self-employed tax calculator (UK 2026/27)

Turnover
Taxable profit (turnover minus expenses)
Income Tax
Class 4 National Insurance
Total tax and NI for the year
Take-home after tax and NI (before your own living costs)
Take-home per month
Set aside from every £100 you invoice
CIS deducted already
Balance with HMRC

The CIS option treats all your turnover as labour. Real deductions come from your contractor's statements: use the CIS refund calculator to enter the actual figure.

Estimate only, not tax advice. Based on GOV.UK 2026/27 rates for England, Wales and Northern Ireland.

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