Free UK tax calculators for your website
Give your clients and readers a working calculator without building one. Copy the code below into any page: WordPress, Squarespace, Wix, Webflow or plain HTML. The calculators are free, need no account, and show 2026/27 rates that we check against GOV.UK (see how we check them).
- No cookies or tracking of your visitors. We count how many times a widget loads, by website.
- Rates update automatically. When HMRC changes a rate, every embedded copy changes with it.
- Keep the short credit line under the calculator. That's the only thing we ask in return.
Employer NI calculator
Employer National Insurance at 15% above £5,000, for one employee or a team, with the £10,500 Employment Allowance. Full version
Director's loan s455 calculator
s455 on an overdrawn director's loan at 33.75% or 35.75%, the date to repay by, and when the tax would be due. Full version
Stamp Duty calculator
SDLT for home movers, first-time buyers, additional properties and limited companies, with the 2% non-resident surcharge. Full version
Want a different calculator, or your firm's colours? Tell us. Accounting practices can also use Reckonly with clients.