Open data
Every figure this site computes comes from the file below. Take it, check it, or build something else with it. If our arithmetic and your arithmetic disagree, the disagreement is in here somewhere and you do not need our permission to find it.
ruleset.json
959 rules across 5 authorities, tax years 2023, 2024, 2025, 2026. Version sha256:7c8a1de9fc6d87cc.
What a rule carries
Each record names the authority and the exact clause, quotes the sentence we read verbatim, and gives the date we read it. contentHash points at our archived copy of that text, because government pages move and a bare URL rots. Money is integer minor units throughout: floats would force a tolerance on the tests, and a tolerance hides real disagreement.
What it does not cover
Only the jurisdictions we have ingested. Where the calculator shows a figure this file does not contain, that figure is prototype data awaiting a source, and it is marked as such on the page rather than quietly mixed in.
Using it
CC BY 4.0. Attribute WorldTaxCalc and keep the source references intact, so whoever reads your version can still reach the original document. The rules are ours to transcribe, not ours to own: the underlying legislation belongs to the authorities named in every record.