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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.
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 & reciprocal tariffs, explained
What IEEPA-based and 'reciprocal' tariffs are, how they differ from Section 301/232, and why they can change quickly.
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 your landed cost & total duty
A step-by-step method to estimate duty and landed cost, including additional tariffs, MPF and HMF.
Read the guide →Reference information only, not customs, legal, or classification advice.