How TariffCatalog handles tariff sources, coverage boundaries, update cadence, official source references, corrections, and data freshness notes.
TariffCatalog maintains a canonical tariff measure database for the United States within its documented coverage boundary. The database includes USITC HTS Chapter 99 additional tariffs (Sections 301, 232, and trade-remedy measures), MPF, HMF, and de minimis thresholds. Rates are sourced from official publications and updated when new revisions are issued. Coverage outside the documented boundary is not maintained.
Within the coverage boundary, the connected calculator resolves duty rate, additional tariffs, MPF, and HMF from the canonical measure database using the TariffResolver. When inputs fall outside the coverage boundary, the calculator returns editable fields and prompts for source-check required review. Users should verify all rates against the relevant official tariff authority before filing.
Pages link to official or platform documentation such as USITC HTS, USTR Federal Register, CBP, EU TARIC, UK Trade Tariff, postal operators, and platform customs-field documentation.
Use the Corrections page to report outdated wording, incorrect examples, formula issues, or source updates. Include an official source URL where possible.
