The lead. A 2,500 kVA pad-mount transformer entered at Long Beach on September 9, 2026 pays 25% duty whether it was built in Monterrey, Osaka or Mumbai, and 50% if it was built in Jiangsu. A low-voltage panel with the PLC already in it pays 0% from Mexico, 10% from Germany, 12.5% from Japan and 40.2% from China. Those two numbers are the whole story of the 2026 tariff schedule: the metal tariff no longer cares where the box came from, and the country tariff no longer touches the metal. Five legal authorities have carried US tariffs since February 2025 and two of them are dead, so every rate below carries its instrument, its Federal Register or CBP citation, and the HTS revision it was read from (HTS 2026 Revision 18). The Open Factory Tariff Exposure Calculator holds the same 198 HTS-by-origin cells with the citation on every one.

Nine origins, one 25% bar each, and a 50% bar for China: HTS 8504.22.00 sits in Annex I-B of the April metals proclamation, which puts 25% on the full customs value regardless of who made it, and China adds the 25% List 1 rate it has carried since 2018. This piece covers what died and what replaced it, the Section 232 tiers line by line, the two Section 301 actions and how they stack on China, the HTS-by-origin table with the CSV, the $80 billion of 2025 imports now under this schedule, a $306k machine landed from five countries, and, behind the wall, the January 1, 2028 cliff and the three purchase-order clauses that handle it.