Reference data

The data layer behind the calculators: official rates, thresholds and rules, each with its source authority and the date we last verified it. Cite it, link it, check it yourself.

Available now

• US state sales tax base rates All 50 states and DC, each linked to its state revenue authority, with as-at dates.

Coming

Cross-jurisdiction datasets (effective tax rates by country, property transaction costs by state, minimum wages and take-home pay) publish as their jurisdictions go live, each as a citable page with full provenance.

Provenance rules: every figure traces to an official government source, is never guessed, and shows when it was last verified. See the methodology.