Tariff Guides
Plain-English guides to how US tariffs work: what they are, how duty is calculated, and how the programs stack on top of each other.
How US Tariffs Are Calculated: Formula and 2026 Examples
How to calculate US import duty: HTS base rate plus every Chapter 99 tariff, then MPF and HMF fees, with four worked examples from October 2026.
· 6 min read
Tariff Stacking Rules 2026: Which US Tariffs Add Up
US tariff stacking rules in 2026: Section 301 China stacks on Section 232, forced-labor and Brazil duties switch off, and how Canada 338 and deal rates combine.
· 6 min read
What Are Tariffs? How US Import Tariffs Work in 2026
What are tariffs? A tariff is a tax on imported goods, paid by the US importer to CBP. Who pays, how rates are set, and which tariffs apply in 2026.
· 5 min read
See every tariff on your import, line by line
Enter an HTS code and a country of origin. HTS Hero stacks the base rate with every Chapter 99 tariff that applies and shows you the math.
What you get
- Section 232, Section 301 and every other program, stacked correctly
- Exemptions and trade preferences that could apply
- Compare the same product from every country