Tax tools
Income tax, National Insurance, VAT and more in one place.
Capital Gains Tax Estimator 2025/26
Estimate UK Capital Gains Tax for 2025/26. Enter proceeds, costs, asset type and other taxable income to see allowance used and CGT due.
Open tool →Dividend Tax Calculator 2025/26
Work out UK dividend tax for 2025/26. Enter salary and dividends to see how the £500 allowance and rates at 8.75%, 33.75% and 39.35% apply.
Open tool →UK Income Tax Calculator 2025/26
Estimate your UK income tax for 2025/26. Enter annual income and optional pre tax pension to see personal allowance, band splits and total tax for England, Wales and Northern Ireland.
Open tool →UK Marginal Tax Rate Explorer 2025/26
See how your next £1 is taxed in the UK for 2025/26. Explore marginal vs average rates, personal allowance taper, High Income Child Benefit Charge, National Insurance and student loans. Share link and CSV export.
Open tool →US Federal Income Tax Calculator 2025
Estimate 2025 US federal income tax. Choose filing status, enter income and deductions. See taxable income, tax by bracket, and effective and marginal rates. Share link and CSV export.
Open tool →VAT Calculator (Add or Remove VAT)
Quickly add VAT or remove VAT at 20%, 5% or any custom rate. Get net, VAT amount and gross totals with presets, multi-item mode and CSV export.
Open tool →Understand your tax without the faff
This hub brings together the tax calculators most people need during the year. Income tax and National Insurance for employees and directors, dividend tax for limited company owners, corporation tax, VAT, stamp duty and Council Tax are covered with clean inputs and results that are easy to copy. If you just need the number, enter your figures and you are done. If you want to check the method, each page includes a short explainer and a worked example in plain English.
Accuracy and clarity come first. Calculations use sensible defaults and rounding where it helps, with labels that match how people actually speak about money. Layout stays consistent across devices and there is no clutter. As thresholds and bands change each tax year, tools are versioned and updated so historic checks are still possible where useful.
Bookmark this page if you run payroll, take dividends, price with VAT, plan property purchases or want to sense-check payslip figures. Stable Numbers is a practical resource designed to save time, reduce errors and give you co