About UK Tax Tools

Last reviewed: 2026-08-16

UK Tax Tools (uktax.tools) is an independent publisher of free, open-source UK tax calculators. Our goal is simple: give individuals an honest, accurate answer to common UK tax questions without sign-ups, paywalls, or sales funnels.

Who runs this site

UK Tax Tools is an independent publication: UK tax, pay, and retirement calculators built from official sources. What stands behind the numbers is process: every rate and threshold is taken from HMRC or the legislation that set it, locked in by an automated test suite, and dated on the page it appears on. We are not a firm of accountants and do not hold a practising certificate. Where professional advice is needed we say so and link to the appropriate professional body (ICAEW or CIOT).

The site is funded entirely by advertising served via Google AdSense. We take no affiliate fees, sponsorships, or payments in exchange for coverage. No third party has editorial influence over the calculators or the guidance we publish.

Part of the TaxTools Network

UK Tax Tools is part of the TaxTools Network — independent tax calculators and tools built from official government sources for Australia, Canada, New Zealand, the United Kingdom, and the United States.

The network sites do not share content or rebadge each other's calculators: each one implements its own country's rules on its own country's tax calendar, because a calculator that generalises across jurisdictions is wrong in all of them. What they share is the published standard they are built to and the methodology they follow.

How content is produced

Tax rates, thresholds, and allowances come from primary sources — GOV.UK, HMRC published guidance, Finance Acts, and the Scottish Government's annual rate resolutions. Every figure in a calculator traces back to a tested TypeScript function; every guide cites the HMRC document it relies on.

Our editorial process is:

Primary-source capture: screenshots and document IDs of the HMRC/GOV.UK page used for each number.
Implementation with automated tests: each band boundary is exercised in code so off-by-one errors are caught.
Cross-check against published HMRC worked examples before release.
Dual-year coverage: both the current and upcoming tax years are maintained once new rates are confirmed.
Post-Budget review: calculators are audited within 48 hours of Autumn Budget / Spring Statement announcements.

Where HMRC guidance is ambiguous or depends on circumstances we can't observe (residency, allowances transferred, marginal relief edge cases), calculators use the most common interpretation and flag the assumption inline. See the Methodology page for per-calculator detail.

Coverage

All four UK nations — England, Wales, Scotland, and Northern Ireland. Scottish income tax bands set by the Scottish Parliament are applied where relevant.
Stamp duty across jurisdictions — SDLT (England & NI), LBTT (Scotland), and LTT (Wales).
Tax years — the UK tax year runs 6 April to 5 April. We currently cover 2025/26 and 2026/27.
Topic areas — Income Tax, National Insurance, take-home pay, dividends, capital gains, inheritance tax, stamp duty, student loans, pensions, Marriage Allowance, High Income Child Benefit Charge, IR35 and CIS, council tax, and more.

Privacy and data

All calculations run in your browser. We do not receive, transmit, or log your financial inputs on any server. We use Google Analytics (anonymous, aggregate usage) and Google AdSense (advertising), both governed by our Privacy Policy and Cookie Policy. Analytics and ad cookies are loaded under Google Consent Mode v2 with all non-essential storage defaulted to denied until you accept.

Corrections

We publish corrections within three working days of verification. If you spot an error, please note the page URL, the inputs you used, our output, and the HMRC source that contradicts it — this is the minimum we need to reproduce and fix an issue quickly.

Disclaimer

UK Tax Tools is for general guidance only and does not constitute tax, legal, or financial advice. For advice on your specific circumstances, consult a qualified tax professional or accountant. See our full Disclaimer and Terms of Use.