How do I calculate US import duty?

Enter your HTS code, country of origin, and customs value (FOB or CIF depending on the trade term). The calculator applies the MFN base duty rate plus any applicable Section 301 surcharges for China-origin goods, then adds MPF (0.3464%, min $32.71, max $634.62) and HMF (0.125%) to produce a total landed-cost estimate.

What is the difference between HTS code and HS code for US imports?

The Harmonized System (HS) is an international 6-digit classification maintained by the World Customs Organization. The US Harmonized Tariff Schedule (HTS) extends this to 10 digits for US imports. The first 6 digits match internationally; digits 7–10 are US-specific for statistical and duty purposes.

Does this calculator include Section 301 tariffs on China goods?

Yes. The calculator includes Section 301 List 1–4A surcharge rates for goods originating in China. These range from 7.5% to 25% depending on the HTS code. Section 301 surcharges stack on top of the MFN base duty.

What is MPF and HMF?

MPF (Merchandise Processing Fee) is charged by US Customs at 0.3464% of the entered value, with a minimum of $32.71 and a maximum of $634.62 per entry. HMF (Harbor Maintenance Fee) is 0.125% of the dutiable value and applies to ocean shipments. Both are collected at the time of customs entry.

How accurate is this import duty estimate?

The calculator provides planning-level estimates using official HTS duty rates and published Section 301 surcharge lists. It is designed for quote screening and cost modeling, not binding customs entry. Final duty liability depends on final HTS classification, origin determination, declared value, and any applicable trade programs (GSP, FTAs). Consult a licensed customs broker for binding classification.