How to Calculate US Import Duty

US import duty is calculated on the customs (FOB) value using the rate for the product's exact HTS code, then additional country layers are stacked. A simple version:

1. Classify the product to its 10-digit HTS code and read the MFN rate.
2. Add origin layers — Section 301 for China, and any security/forced-labor base.
3. Add Section 232 if the category is covered.
4. Add MPF (0.3%, capped) and, for ocean cargo, HMF (0.1%).

Landed cost = value + duty + MPF + HMF, before freight, insurance and broker fees. Our free calculator does this from a plain product description.

Do you sell these imports on Amazon? Helium 10 handles product research, keywords and listing optimization for Amazon FBA sellers. (Affiliate link — we may earn a commission at no extra cost to you.)