Where our data
comes from
Every duty rate in DutyFlow is sourced directly from official government databases. No third-party data vendors. No AI-generated rates. Full provenance on every calculation.
Official sources only
Direct ingestion from government portals and official APIs. No third-party tariff vendors.
Updated daily
Critical datasets like Section 301 exclusions and CBP fee schedules refresh every 24 hours.
Estimates, not rulings
For formal customs entries and binding rulings, consult a licensed customs broker.
Official data by jurisdiction
US HTS Schedule
Annual (January) + supplemental updatesUnited States International Trade Commission (USITC)
Tariff classification + base duty rates
The Harmonized Tariff Schedule of the United States. All 99 chapters covering goods imported into the US. Includes general rates, special rates, and column 2 rates.
Section 301 Actions
Continuous β exclusions updated quarterlyOffice of the United States Trade Representative (USTR)
Additional duties on Chinese-origin goods
Lists 1β4A covering Chinese goods under Section 301 of the Trade Act of 1974. Rates of 7.5%β25% applied on top of base HTS rates. Includes Chapter 99 HTS overlay codes.
CBP Fee Schedule
Periodic β MPF cap adjusted annuallyUS Customs and Border Protection (CBP)
Merchandise Processing Fee, Harbor Maintenance Fee
CBP fee rates including the Merchandise Processing Fee (MPF at 0.3464%, min $31.67, max $614.35) and Harbor Maintenance Fee (HMF at 0.125%) as defined in 19 CFR 24.23.
WTO MFN Rates (EU & Global)
Annual β updated on WTO notification cycleWorld Trade Organization β Tariff Download Facility
Most-favoured-nation duty rates for 200+ countries
WTO MFN tariff data covering 200+ countries including EU member states. Used for all non-US destination calculations when country-specific bilateral data is unavailable.
UK Global Tariff
Real-time via HMRC Trade Tariff APIHM Revenue & Customs (HMRC)
UK import duty rates post-Brexit
UK-specific tariff schedule established after Brexit. Covers commodity codes, duty rates, trade agreements including CPTPP, and the UK Tariff Preference scheme for developing countries.
WTO Bound Rates & FTA Schedules
Annual β FTA phasedown schedules tracked on treaty cycleWorld Trade Organization + bilateral FTA texts
MFN bound rates + preferential FTA rates
WTO MFN tariff data for 200+ countries and FTA preferential rates under USMCA, KORUS, Japan-US Trade Agreement, EU bilateral FTAs, and CPTPP member schedules.
VAT / GST Rates
Updated on government announcementNational tax authorities β country by country
Standard VAT/GST rates per destination market
Standard and reduced VAT/GST rates sourced directly from each country's official tax authority. Covers 50+ destination markets including EU member states, UK, Canada, Australia, Japan, and more.
How often data refreshes
| Data source | Frequency | Status |
|---|---|---|
| US HTS base rates | Annual | Live |
| Section 301 / IEEPA overlays | Continuous | Live |
| CBP fee schedule | Periodic | Live |
| WTO MFN rates | Annual | Live |
| UK Trade Tariff | Real-time | Live |
| WTO MFN rates | Annual | Live |
| FTA preferential rates | Annual | Live |
| VAT/GST rates | On change | Live |
Important disclaimer
DutyFlow provides duty rate data for estimation and planning purposes only. Rates shown are not binding on CBP, HMRC, or any customs authority. Actual duties depend on accurate tariff classification, country of origin determination, customs valuation method, and applicable trade agreements β all of which require professional analysis.
For formal customs entries, binding tariff classification rulings, or disputed customs decisions, consult a licensed customs broker or trade attorney. DutyFlow is not a substitute for professional customs advice.
Ready to use this data
in your application?
Access all official duty rate data through a single API call. Full source citations in every response.