Tariff Calculator
HTS code + origin + shipment value → estimated US import duty.
How is the duty estimate computed?
The ad valorem percentage and any specific per-unit component of the official Column 1 general rate are applied to your shipment value and quantity, then any matching Chapter 99 provision — like the 25% Section 232 steel measure in force since 2018 — is stacked on top. Rates reflect the USITC schedule rebuilt October 9, 2026.
Where do the rates come from?
Every rate is republished from the official US Harmonized Tariff Schedule maintained by the USITC (23,193 lines, export of October 9, 2026); classification rulings remain searchable via CBP CROSS. Each dataset stores its source URL and timestamp so you can audit any figure against hts.usitc.gov.
Does the calculator include Section 301 or 232 duties?
Yes — 637 Chapter 99 provisions from the October 10, 2026 USITC export are matched automatically, including the Section 301 measures (25% on most China lists since May 10, 2019) and Section 232 steel and aluminum. The base rate table is the October 9, 2026 schedule rebuild; each stacked layer keeps its own effective date.
Why does the country of origin matter?
Trade-remedy duties attach to origin, not to the shipping route. Goods transshipped through a third country remain China-origin unless they meet the substantial-transformation test under 19 CFR Part 134, so a foreign commercial invoice alone cannot remove Section 301 duties; CBP rulings show how the test is applied.
Can I use the estimate for a customs declaration?
Treat it as a planning estimate. Entered value, valuation additions under 19 CFR Part 152, freight terms and the entry date determine the legal amount CBP assesses. ExportSonar mirrors the official rate tables; for certainty, request a binding ruling from CBP before relying on any figure.
Primary sources: USITC Harmonized Tariff Schedule · CBP CROSS classification rulings · 19 CFR Part 152 — Customs valuation (eCFR)