What is Afterax?
Afterax is a free UK tax calculator and plain-English tax guide website for the 2026/27 tax year. It helps individuals, contractors, freelancers, founders, landlords, and small business owners understand income tax, bonus tax, salary sacrifice, self-assessment, salary vs dividends, and common high earner tax traps.
Afterax is an educational resource and does not provide regulated tax, accounting, legal, or financial advice.
Who builds this
Afterax is built and maintained as an independent educational UK tax calculator project.
The site was created to make UK tax easier to understand by bringing calculators, plain-English guides, and HMRC-sourced tax rules into one place. There is no sign-up, no paywall, and no advertising.
You can follow Afterax on LinkedIn: Afterax on LinkedIn
What we cover
- Income tax: PAYE take home pay, National Insurance, allowances, regions, and high earner tax traps
- Bonus tax: why bonus pay can feel overtaxed and how salary sacrifice can change the result
- Salary sacrifice: pension contributions, employer match, minimum wage checks, and take home trade-offs
- Self-assessment: sole trader profit, Class 4 National Insurance, payments on account, and tax to set aside
- Salary vs dividends: limited-company owner pay, corporation tax, personal tax, NIC, and dividend tax
- Dividend tax: the £500 allowance, dividend rates, and how dividends stack on top of salary
- Capital gains tax: shares, crypto, property, and the post-October 2024 rates
- Stamp duty: SDLT, LBTT (Scotland), and LTT (Wales) with first-time buyer, additional, and non-resident rates
- VAT: net/gross conversion, Flat Rate Scheme liability, and the £90,000 registration threshold tracker
- Inheritance tax: Nil-Rate Band, Residence NRB, transferable allowances, taper, and the 36% charity rate
- Small business tax: corporation tax, marginal relief, associated companies, sole trader, and VAT calculators
How we calculate
Afterax implements UK tax rules directly from HMRC's published rates and bands. The engine runs entirely in your browser, so your salary, gain, or estate value never leaves your device. There's no signup, no tracking on your inputs, and no ads.
We update the engine every tax year (and out-of-band when statutory changes mid-year, like the October 2024 capital-gains reforms). Each calculator page shows when its data was last reviewed.
Where the data comes from
- HMRC income tax rates and personal allowances
- HMRC National Insurance rates
- HMRC Capital Gains Tax rates
- HMRC Stamp Duty Land Tax rates
- Revenue Scotland LBTT
- Welsh Revenue Authority: LTT
- HMRC Inheritance Tax
What we're not
Afterax is an educational resource. It does not provide regulated tax, accounting, legal, or financial advice. The numbers you see are estimates based on the inputs you provide and HMRC's published rates. They should help you understand your position, but they're not a substitute for advice from an accountant, a financial planner, a solicitor, or HMRC itself before making real decisions.
Get in touch
Spot something wrong, want a feature, or want to flag a tax-rule update we missed? Send a message, we read everything and reply by email.