Adjusting Imports of Medium- and Heavy-Duty Vehicles, Medium- and Heavy-Duty Vehicle Parts, and Buses Into the United States

This proclamation uses broad national-security authorities (Section 232) to tighten imports of medium- and heavy-duty vehicles (MHDVs), their parts (MHDVPs), and buses. It declares that current import levels threaten the United States and imposes steep tariffs to reduce foreign reliance, with the aim of strengthening domestic production, supply chains, and defense readiness. The plan combines a flat tariff on most MHDVs/MHDVPs (25%) and buses (10%), with special rules for vehicles that qualify for USMCA treatment, and a defined program of offset benefits for US-assembled vehicles and engines to partially offset those tariffs. The approach is designed to push the domestic industry toward greater production in the United States, expand jobs, and bolster national security through more self-reliant trucking and bus sectors, while permitting some expansion of the tariff scope over time. Key features include: (1) a 25% tariff on most MHDVs and MHDVPs and a 10% tariff on buses, effective for entries on/after November 1, 2025; (2) a USMCA-content framework that can limit or offset tariff exposure based on the share of US content; (3) an “import adjustment offset” program allowing manufacturers to shield part of their tariffs by crediting offsets tied to US-made content (3.75% of the value of US-assembled MHDVs, with parallel treatment for engines) during 2025–2030; (4) authority to add additional MHDVPs to the tariff list and to align with related proclamations, plus enforcement and administrative provisions (CBP administration, HTSUS adjustments, and stacking rules); and (5) exemptions for very old models (25 years or older) and other practical implementation details.