SoleTraderTaxCalculator
Updated for 2026/27

Self-employed NI calculator

Class 4 NI is paid through Self Assessment on the same profit figure as income tax. This shows the NI element in isolation and how it stacks against the total bill.

Updated for 2026/27. Uses UK tax bands and HMRC/GOV.UK guidance. Estimates only — not tax advice.

Calculate sole trader tax Read the guides
Class 4 NIBand breakdownProfit thresholdsUK-wide rates
2026/27 tax year England, Scotland, Wales & NI Student loan support Practical reserve figure

Sole trader tax calculator

Self-employed tax estimate

Adjust inputs below — results update instantly.

Tax year 2026/27
How do you earn?

Enter profit after allowable business expenses — not total turnover.

The annual profit used in calculations will be monthly profit × 12.

£
£
Expenses exceed estimated turnover — check your inputs.
£
£
Expenses exceed estimated turnover — check your inputs.
£
£
£36,568take-home / year£3,047/mo
Monthly net
£3,047
Tax set-aside
£703
Quarterly reserve
£2,108
Take-home£36,568
Income Tax£6,486
National Insurance£1,946
Student loan£0
Pension£0
Show detailed breakdown ▼
Income tax£6,486.00
Class 4 National Insurance£1,945.80
Student loan£0.00
Pension contribution£0.00
Take-home after tax£36,568.20
Monthly tax set-aside£702.65
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HMRC 2026/27 · Methodology
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How payments on account work, when they apply, why they catch people out and how to plan your monthly set-aside to cover them.
Self Assessment deadlines for sole traders
The key filing and payment deadlines sole traders must know, what late filing costs, and how to use your tax estimate to prepare in advance.
AfterTaxSalary.co.uk
Use the PAYE salary tool if you want an employed take-home comparison beside your self-employed result.
EmployerCalculator.co.uk
Useful when a sole trader contract is being weighed against hiring someone through payroll.
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Use this where self-employed income affects benefits planning or household budgeting.
HomeBuyingCosts.co.uk
Useful once you want to turn stable post-tax profit into a realistic home-buying budget.
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