Editorial Standards
SoleTraderTaxCalculator.co.uk publishes free, editorially independent content on self-employment tax, Self Assessment and related topics. This page explains how that content is produced and kept accurate.
Written and reviewed by James Whitfield · Last reviewed 29 October 2026 · Checked against 2026/27 HMRC rates · Editorial standards · Methodology
Who writes the content
Guides are written by James Whitfield and checked by the SoleTraderTaxCalculator team. We are not regulated tax advisers. We aim to produce clear, accurate explanations of UK sole trader tax rules for people who are self-employed or considering self-employment.
We do not accept sponsored content, paid placement or payment to include or favour any financial product, service or third party in our guides or calculators.
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How we check sole trader figures
Your profit is added to any other income before Income Tax is worked out, so the bands are shared correctly; Scottish taxpayers are calculated on the Scottish bands for the selected tax year.
Class 4 National Insurance is charged on profit only: 6% between £12,570 and £50,270 and 2% above. Class 2 is not added: with profits of £7,105 or more it is treated as paid, and below that it is voluntary (£3.65 a week in 2026/27).
Student loan repayments are worked out on your total income for the plan you choose. Pension contributions are shown as money you pay out; the calculator does not add the tax relief on them, so for that use a pension tax relief calculator.
Figures announced for future years, such as the £3,000 trading allowance from April 2027, are labelled with their status until they are law.
How we keep rates accurate
All tax rates, thresholds and allowances used in the calculator and guides are sourced from HMRC and GOV.UK. We review and update these following each UK Budget and at the start of each new tax year.
Where rates change mid-year (which is rare), we aim to update affected pages within five working days of the change being confirmed in official guidance.
What this site is and is not
This site is a tax estimation tool and educational resource. It is not a regulated financial adviser, accountant or tax return service. Estimates produced by the calculator are illustrative and do not constitute formal tax calculations or Self Assessment returns.
Where professional advice is appropriate — for example, for complex affairs, compliance decisions or significant financial planning — we say so explicitly.
Corrections and feedback
If you believe a rate, threshold or piece of information on this site is incorrect, use the contact form at soletradertaxcalculator.co.uk/contact. Please include a link to the relevant HMRC or GOV.UK source. We investigate all credible corrections promptly.
Estimate your sole trader tax
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.