Official Data Sources Register

Authoritative government tariff schedules, valuation bases, and synchronization standards.

Our Primary Sourcing Standard

DutyDecoder does not use web-scraped aggregators, crowd-sourced rate estimates, or unverified secondary databases. Every duty rate, de minimis threshold, and fee calculation originates directly from an official government tariff authority or bilateral Free Trade Agreement schedule.

Primary National Customs Schedules

United States

Official Portal

U.S. International Trade Commission (USITC) / U.S. Customs & Border Protection (CBP) • Harmonized Tariff Schedule of the United States (HTSUS 2026)

Update Cadence: Continuous / Within 48h of Federal Register publication
Valuation Rule: FOB (Free on Board) — Duty assessed on product value only; excludes international freight & insurance.

European Union (27 Member States)

Official Portal

European Commission — Taxation and Customs Union (DG TAXUD) • TARIC (Integrated Tariff of the European Union) / Combined Nomenclature

Update Cadence: Daily synchronization with Official Journal of the EU
Valuation Rule: CIF (Cost, Insurance & Freight) — Duty assessed on sum of product value, shipping, and transit insurance.

United Kingdom

Official Portal

His Majesty's Revenue and Customs (HMRC) / Department for Business and Trade • UK Global Tariff (UKGT)

Update Cadence: Continuous / Post-Brexit statutory updates
Valuation Rule: CIF (Cost, Insurance & Freight) — UK customs value includes freight and insurance to the UK border.

Canada Border Services Agency (CBSA) • Canadian Customs Tariff Schedule

Update Cadence: Monthly / Federal Gazette notices
Valuation Rule: FOB (Free on Board) — Duty assessed on value of goods at point of direct shipment.

Ministry of Finance (MOF) / Japan Customs • Customs Tariff Schedules of Japan

Update Cadence: Semi-annual & statutory gazettes
Valuation Rule: CIF (Cost, Insurance & Freight)

Australian Border Force (ABF) / Department of Home Affairs • Australian Working Tariff

Update Cadence: Periodic statutory updates
Valuation Rule: FOB (Customs Value is based on Free on Board purchase price)

Central Board of Indirect Taxes and Customs (CBIC) • Indian Customs Tariff Act / Central Excise Schedules

Update Cadence: Continuous / Annual Union Budget notifications & SROs
Valuation Rule: CIF + 1% Landing Charges assessable value base

Federal Board of Revenue (FBR) • Pakistan Customs Tariff (PCT) & Statutory Regulatory Orders (SROs)

Update Cadence: Continuous tracking of SROs, ACD, and Regulatory Duties
Valuation Rule: CIF with national minimum valuation rulings (Valuation Rulings/VRs)

Foreign Exchange & Multi-Currency Valuation

When a shipment is invoiced in a currency other than the importing country's legal assessment tender, conversions are executed using institutional mid-market rates from ExchangeRate-API, synchronized every 24 hours. Customs calculations are processed with arbitrary decimal precision (Decimal.js) to avoid compound currency truncation discrepancies.

Data Corrections & Rate Inquiries

We welcome feedback from licensed customs brokers, trade compliance attorneys, and importers. If you notice a tariff rate, regulatory duty, or de minimis policy that does not reflect a newly enacted statutory order, please notify our corrections desk.

Submit rate notices to: corrections@dutydecoder.com or via our Contact Desk.