Privacy
Last updated 15 July 2026.
Your privacy is straightforward here, because the site is built to need almost nothing from you. In short: the figures you type never leave your browser, and the site sets no cookies.
Your figures never leave your browser
The calculator runs entirely in your browser. Your salary, pension, bonus and every other input are used only on your device to compute the result — they are never sent to a server, never logged, and never stored anywhere. There is no account and no backend that sees them.
Cookies
This site sets no cookies and stores nothing on your device, beyond remembering your light/dark theme preference locally in your own browser if you change it.
Analytics
We use Vercel Web Analytics and Speed Insights to understand aggregate traffic and page performance. Both are privacy-preserving and cookieless, served from this site’s own domain — no third-party tracker is contacted from your browser.
They record anonymous page views and Core Web Vitals (loading and responsiveness metrics). They do not store your IP address and cannot link you across days or across sites. None of your calculator inputs are ever included.
No third-party tracking or selling of data
There are no third-party tracking scripts on the site, and nothing about you is sold or shared.
Changes and contact
If these practices change, this page will be updated with a new date. For any privacy question, email hello@effectivetax.co.uk.