SoleTraderTaxCalculator.co.uk is a free planning tool for UK sole traders, freelancers and self-employed people. It estimates income tax, Class 4 National Insurance, take-home profit and monthly tax set-aside based on published HMRC rates for the current tax year.
Updated 2026/27 · SoleTraderTaxCalculator.co.uk · Editorial standards · Methodology
The site is built for self-employed people who need a reliable estimate of their tax exposure and how much to set aside — without having to wait for an accountant to run the numbers or navigate HMRC's tools.
Most useful for: freelancers and contractors quoting day rates or project fees and wanting a realistic take-home figure; sole traders assessing whether to incorporate as a limited company; anyone transitioning to self-employment wanting to understand the tax picture before they start; and people with both employment and side-hustle income who want to model the combined position.
This site is not an accounting or filing tool. It produces estimates based on a simplified model and published rates. For complex situations, formal tax planning or Self Assessment filing, a qualified accountant is the right resource.
Content on this site is written by the editorial team and reviewed against published GOV.UK and HMRC guidance. Tax rates, thresholds and rules are reviewed and updated at each Budget and at the start of each new tax year.
Where a rate or threshold may change between our last update and your visit, source links to the relevant GOV.UK pages are provided so you can verify the current position independently. Last updated: May 2026.
If you believe a figure or rate is incorrect or out of date, please contact us. Accuracy is the first requirement of a useful planning tool.
This site is part of an independent network of UK finance calculators, each focused on a specific part of personal or business finance. The network includes AfterTaxSalary.co.uk (PAYE salary and take-home), EmployerCalculator.co.uk (employer payroll costs), LimitedCompanyTaxCalculator.co.uk (limited company tax and extraction planning), UKBenefitsCalculator.co.uk (benefits entitlements) and HomeBuyingCosts.co.uk (property purchase costs).
The sites are designed to work together. If you want to compare sole trader and limited company tax, use this site for the sole trader baseline and LimitedCompanyTaxCalculator.co.uk for the company-plus-extraction model.
The sole trader tax calculator turns this guidance into a concrete monthly take-home and tax reserve estimate, based on 2026/27 HMRC rates. Enter taxable profit — not turnover.
Self Assessment checklist, expense tracker and payments on account calendar — all in one practical PDF. Updated for 2026/27.
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