Methodology

Maintained by Aissam Drai, MetalAttest. Sources last checked 29 September 2026. Methodology · corrections: info@metalattest.com

Sources

How the rules table is built

Each line on CBP's Metals HTS List becomes one row with its annex, the applicable metal(s), the rate tier and Chapter 99 heading, the effective date, whether the 15% de minimis is available (not for chapters 72, 73, 74 and 76), and the source URL. The June list is compared with the April list; additions and removals are recorded in the rules changelog. Current version: 2026-06-08.1 (719 lines). Download: JSON · CSV (CC BY 4.0).

How the 15% calculation works

The calculator adds the weights of the components made of the applicable metal(s) for the HTS line and divides by the total article weight. Only metals CBP's list names for that line are counted. The result qualifies only if it is strictly less than 15%; exactly 15.00% does not qualify. Lines in chapters 72, 73, 74 and 76 are excluded. The applicable-metal weight in kg is the second quantity reported when 9903.82.03 is claimed (CSMS #68253075). The calculator is covered by unit tests, including CBP's 8302.10.60 example and the exact-15% case.

Limits

MetalAttest provides data for the importer's and customs broker's review. We do not classify goods and we do not give customs or legal advice. Your licensed customs broker decides classification and files the entry. We reproduce published lists for codes you look up; we do not determine classification, origin or duty treatment.

Corrections

If you find an error, email info@metalattest.com with the HTS number and the source. Confirmed corrections are published in the changelog.