A new White House proclamation signed April 2 changes how Section 232 tariffs are applied to steel, aluminum, and copper imports and their derivative products, with the new structure taking effect April 6. The change does not scrap the metal tariffs. It redraws them.

Under the new rules, goods made almost entirely of steel, aluminum, or copper will continue to face a 50% tariff. Certain derivative goods that are substantially made of those metals will face a 25% levy instead. The administration also said products containing 15% or less steel, aluminum, or copper will no longer be subject to the Section 232 tariffs.

For trucking, one detail stands out. Trade coverage of the proclamation said the covered derivative goods include semi-trailers and trailers, which puts the industry directly inside the reach of the new tariff structure.

The White House also created lower rates for several categories. Certain metal-insensitive industrial equipment and electrical grid equipment will face a 15% tariff through 2027. Imported goods made entirely with U.S.-origin steel, aluminum, or copper will face a 10% levy. The proclamation also set lower rates for certain products from the United Kingdom, with 25% on goods made almost entirely of the metals and 15% on derivative goods.

The administration said the point of the change is to strengthen domestic production and close gaps in how the tariff program has been working. In the proclamation, the White House said the tariffs should apply to the full customs value of metal articles and derivatives and said the updated structure is meant to address national-security concerns more effectively.

This is the kind of policy move that can show up first in quotes, invoices, and replacement-part pricing before it shows up anywhere else. If trailers, trailer components, and other metal-heavy equipment are coming in under the revised tariff rules, fleets, dealers, and repair operations will be watching closely to see where suppliers pass costs through and where they absorb them.

Another change in the proclamation ends the old process for adding derivative products through the earlier inclusion system. Going forward, the Commerce Department and U.S. Trade Representative can add derivative articles on a rolling basis when they jointly determine those imports threaten to undermine the tariff actions.

For now, the headline is simple: the tariff program on steel, aluminum, and copper is still in place, but the rate now depends more clearly on what the product is and how much metal content it carries. With the new structure taking effect April 6, trucking businesses that buy trailers, source imported parts, or track equipment pricing have a fresh policy change to watch.