Free UK tax calculators – quick answers to the questions people actually Google
Free UK tax calculators for 2025/26 – self-employed National Insurance, inheritance tax gifts and overpaid tax checks. Official HMRC rates, verifiable logic, no sign-up, no data collected.
2025/26 key rates at a glance
£12,570Personal allowance (income tax & NI threshold)
6% / 2%Class 4 NI on £12,570–£50,270 / above
£325,000Inheritance tax nil rate band
40%Standard inheritance tax rate
£3,000Annual IHT gift exemption
4 yearsTime limit to claim a refund
Self-employed
Self-Employed National Insurance Calculator
How much Class 2 and Class 4 National Insurance do you owe on your self-employed profits in 2025/26?
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Inheritance
Inheritance Tax Gift Calculator
Is a gift you made in the last 7 years liable for inheritance tax? Includes the annual exemption and taper relief.
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Refund check
Overpaid Tax (Refund) Calculator
Think you paid too much tax? Estimate whether you are owed a refund and learn how to claim it from HMRC.
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Free UK tax calculators by scenario
🧾 Self-employed
- Self-Employed NI Calculator
- Class 4 NI Calculator
- Mileage Allowance Calculator
🏠 Assets & inheritance
- IHT Gift Calculator
- Property Capital Gains Tax Calculator
- Dividend Allowance Calculator
💼 Employment & benefits
- Car Benefit-in-Kind Calculator
- Tax-Free Childcare Calculator
🔁 Refunds & allowances
- Overpaid Tax Calculator
- Marriage Allowance Calculator
Disclaimer: These calculators provide estimates for general information only and do not constitute financial, tax or legal advice. Our full calculation logic is published on the Methodology page. For personal advice, consult a qualified accountant or tax adviser.