Our mission
UK tax is genuinely complicated. You've got income tax with personal allowances, National Insurance rates that change at different salary thresholds, pension relief calculations, SDLT thresholds that vary by region, ISA rules that change annually, child benefit high-income charges, and then Capital Gains Tax, dividend tax relief, and Marriage Allowance rules on top. Most free calculators are either American, outdated, or require you to sign up and hand over your personal data. BritCalc was built to fix that: fast, accurate, up-to-date calculators for the UK tax system. No sign-up. No fees. No data collection.
Our principles
HMRC-accurate
All rates are sourced from HMRC and GOV.UK, updated after each Spring Budget and Autumn Statement.
Covers the full picture
Income tax, National Insurance, SDLT, ISA, pension relief, Capital Gains Tax, dividends, child benefit, and Marriage Allowance — not just headline rates.
Private by design
All calculations run in your browser. Nothing is sent to our servers. Your financial data never leaves your device.
Free forever
Supported by advertising. Never paywalled, never premium-only features, never asking for a subscription.
What we calculate
Important disclaimer
BritCalc is not affiliated with HMRC and we are not financial advisers or accountants. All calculations on this site are estimates only. For anything that genuinely matters — a tax return you're filing, a property purchase, significant financial decisions — please verify with a qualified accountant or IFA. Find a regulated adviser at gov.uk/find-a-financial-adviser.