The site is designed to be useful without unnecessary personal data collection. Calculator inputs are used to generate estimates and are not stored as personal financial records on our servers.
Updated 2026/27 · SoleTraderTaxCalculator.co.uk · Editorial standards · Methodology
When you enter profit, income or other values into the calculator, those inputs are used to compute your estimate in the browser and are not stored on our systems as personal records. Query parameters may appear in your browser URL, but they exist only to regenerate the calculation on page load and are not logged server-side.
The site may use privacy-configured analytics (IP anonymisation enabled) to understand aggregate usage patterns. Advertising services, if enabled, are configured via environment variables at deployment. No cookies are used to identify you personally or track you across other websites beyond any third-party service explicitly noted.
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.
Get the pack — £3.99 →