10 free calculations a day without a key. With a free key: 250 duty stacks a month by API. Duty Stack docs.
Recent changes
Between 2025-10-09 and 2026-10-09: no change in the Chapter 99 headings applied for the main origins. Dated changes, with their sources: the change list and the Tariff Change Feed.
Scope
We do not classify goods. These pages show reference rates for HTS codes. Choosing the code for an entry is the importer's responsibility, and entries are filed by the importer of record or a licensed customs broker. Duties shown are calculations from public sources, not legal advice.