Free UK tax tools that actually work on your phone.
Self-assessment, PAYE, CIS, IR35 — estimates in seconds, no sign-up, updated for the 2026/27 tax year.
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No sign-upOffline-friendlyUpdated 2026/27
Popular tools
View all- Income Tax CalculatorSee your full tax breakdown by band, including the personal allowance taper.
- Take-Home Pay CalculatorNet salary after income tax, National Insurance, pension, and student loan.
- National Insurance CalculatorClass 1, 2, and 4 NI — for employees and the self-employed.
- HMRC Mileage CalculatorCalculate your AMAP claim — 45p/25p for cars, motorcycle, bicycle, passenger supplement.
- IR35 CalculatorInside vs outside IR35 — the real financial difference.
- VAT CalculatorAdd or remove VAT at any rate. Includes flat rate scheme calculator.
- Payment on Account CalculatorWork out your January and July Self Assessment advance payments based on last year's tax bill.
- Self Assessment EstimatorEstimate your Self Assessment tax bill before you file.
Browse by category
- Tax calculatorsIncome tax, dividend tax, and CGT.
- NI & self-employmentClass 1, 4, self assessment.
- VATAdd/remove VAT, flat rate scheme.
- Contractor toolsIR35, day rate, Ltd vs sole trader.
- Self-employmentMileage, expenses, sole trader tools.
- Side hustleExtra income, simplified expenses.
- Salary & PAYETake-home pay, pension, student loan.
- Property & CGTCapital gains, SDLT, rental income.
Why Indietax?
Always up to date
Rates are updated each April. The 2026/27 tax year is fully loaded — personal allowance freeze, Class 4 NI at 6%, dividend allowance at £500.
No sign-up needed
No account, no email, no tracking. Use every tool anonymously. Your numbers never leave your device.
Works offline
Built as a progressive web app. Once loaded, all calculators work without a connection — ideal for client meetings.