Afteraxis a free suite of UK tax calculators built around a single question: what's actually left after the tax? Most calculators stop at a take-home number. Afterax shows the band journey, the employer's hidden cost, the allowances you're losing, and the traps that catch high earners.
Who builds this
Afterax is built and maintained by Mehmet Demir, a software engineer living in London. The site started as a personal project after spending too many evenings bouncing between HMRC pages just to figure out what a real take-home number looked like. It's a hobby, not a business. No sign-up, no input tracking, nothing behind a paywall.
I'm on LinkedIn if you have a question or want to flag a tax-rule change I've missed.
Personal project. Views are my own and not those of any employer.
What we cover
- Income tax: PAYE and self-employed, England, Wales, Northern Ireland and Scotland
- Capital gains tax: shares, crypto, property, and the post-October 2024 rates
- Dividend tax: 10.75/35.75/39.35% rates for 2026/27, the £500 allowance, and how dividends stack on top of salary
- Director mix: the joint salary-vs-dividend optimiser for limited-company owners (corporation tax, NIC and dividend tax in one model)
- 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
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 not a regulated financial advisor. The numbers you see are estimates based on the inputs you provide and HMRC's published rates. They should help you understand your position. They're not a substitute for advice from an accountant, a financial planner, 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.