If you need to work out your take-home pay, estimate your income tax bill, or plan for Self Assessment, having the right calculator makes all the difference. Here are the best free UK tax calculators available online in 2025 — all updated for the 2024/25 tax year.
1. Take-Home Pay Calculator (PAYE)
The most-used tool for anyone on a salary. Enter your gross salary, tax code, pension contribution percentage, and student loan plan, and it calculates your exact net pay after income tax, National Insurance, and all deductions. Try the free Take-Home Pay Calculator at Calculators Now.
2. Income Tax Calculator
See your income tax broken down band by band — Basic Rate, Higher Rate, and Additional Rate — with separate calculations for Scotland. The Income Tax Calculator at Calculators Now covers all UK regions for 2024/25.
3. National Insurance Calculator
Calculate employee, employer, and self-employed National Insurance contributions. Includes the April 2024 rate cut (main rate reduced from 10% to 8%). Use the National Insurance Calculator at Calculators Now.
4. Self-Assessment Tax Return Calculator
For the self-employed, landlords, and higher earners who need to file a Self Assessment return. Estimates your tax bill from multiple income sources and calculates your payments on account for January and July. Try the Self-Assessment Calculator at Calculators Now.
5. Pension Calculator
Project your pension pot at retirement with employer contributions, tax relief, and compound growth. Includes a year-by-year milestone table and a 4% withdrawal estimate. Use the Pension Calculator at Calculators Now.
All UK Tax Calculators in One Place
For a full overview of all UK tax tools — including an hourly to salary converter, salary comparison, and 2024/25 rates at a glance — visit the UK Tax Hub at Calculators Now.
All calculators are free, require no registration, and are updated for the 2024/25 tax year.