US tariffs, explained
Plain-language guides to the tariff rules that affect cross-border ecommerce — what's changing, how each measure works, and how to act on it. Every guide links straight into the live code, rate, and measure data.
Find the HS/HTS code for your product and its US import duty rate, or search 10,000+ codes directly. See the country-by-country add-on duties on any code page.
Timeline
Policy explainers
Section 301 tariffs on China, explained
What Section 301 tariffs are, why they exist, how they stack on top of normal duties, and how to check if your product is affected.
Read the guide → Policy explainersSection 232 tariffs on steel & aluminum, explained
How Section 232 national-security tariffs work, which goods they cover, and how they interact with other duties.
Read the guide → Policy explainersIEEPA and reciprocal tariffs after the 2026 Supreme Court decision
A dated history of the 2025 IEEPA tariff actions, the Supreme Court's February 20, 2026 holding, and how to identify the authority governing a current entry.
Read the guide → Policy explainersAnti-dumping & countervailing duties (AD/CVD), explained
How AD/CVD orders work, why they can be very high, and how to check if your product and country are covered.
Read the guide → Policy explainersThe $800 de minimis threshold, explained
What de minimis is, why it matters for small ecommerce shipments, and how changes to it affect sellers.
Read the guide →Country guides
How-to
How to read an HTS code
What each part of a 10-digit HTS code means and how classification narrows from chapter to code.
Read the guide → How-toHow to Calculate U.S. Landed Cost and Import Duty
Calculate U.S. landed cost step by step from customs value, import duty, additional tariffs, MPF, HMF, freight, insurance, and logistics costs.
Read the guide →Reference information only, not customs, legal, or classification advice.