TraderFigures is an independent website. It is not HM Revenue & Customs, not GOV.UK, and not a firm of accountants or tax advisers. Nothing on the site creates a client relationship.

A calculator ignores things that often change a real bill: other income, pension contributions, Gift Aid, the Marriage Allowance, student loans, the High Income Child Benefit Charge, capital gains, and the difference between the cash basis and traditional accounting where you have not already applied it yourself. The assumptions are written on each calculator. Read them before you rely on a total.

Rates were checked against GOV.UK on 15 November 2026. Tax rules change, pages on GOV.UK are updated, and a figure that was right on that date can be wrong later. Where this site is not sure, it says so. You are still responsible for the return you file.

If the amount at stake matters, or your situation is not a straightforward sole trade, use the original GOV.UK guidance or a qualified adviser. Do not send a payment to HMRC based only on a number from this site.