Where the rates come from
2026-27Every figure this site uses, for 2026-27, and where each one came from.
53 of 53 have been read against the gov.uk page they cite by a person, who recorded the date and the sentence they read. The rest are shown with their source so you can check them yourself. Verification expires on its own when gov.uk rewrites the wording.
Income Tax – England, Wales and Northern Ireland
Income Tax – Scotland
National Insurance
Student loans
Child Benefit
High income child benefit charge
Inheritance Tax
Construction Industry Scheme
How this page is kept true
It is generated from the same file the calculators read, every time the site is built. Nothing here is typed by hand, so it cannot describe a rate the calculators are not actually using.
Each figure records the page it came from and, once a person has read it there, the date and the sentence they read. That sentence is hashed – so when gov.uk rewrites the wording, the check stops matching and the figure goes back to unverified rather than quietly staying green. A weekly job re-reads every source and raises an issue when one changes.
Rates live in dated data, never in code. A percentage written into a calculator would be a bug, because it could not appear on this page.