Tariff rewrite puts cross-border metal trade in crosshairs
The Trump administration plans to overhaul its steel and aluminum tariff regime, a change that could raise import costs for certain products and reshape freight flows across the U.S., Mexico, and Canada.
These tariffs, enacted under Section 232 of the Trade Expansion Act, target imports deemed a threat to national security. The proposed adjustments would apply duties to the full value of derivative products—such as finished or semi-finished goods—rather than solely to the metal content within them.
North American supply chains are highly integrated, particularly in the auto and industrial sectors. Raw metals may be melted in the U.S., processed in Mexico, and assembled into parts that cross the border multiple times before reaching final assembly or sale. Under the current system, tariffs focus on the raw metal portion. The new approach would tariff the entire value of these derivative products when imported into the U.S. from Mexico or Canada, even if the original metal originated in the United States.
This shift is expected to come via presidential proclamation. It would maintain the 50% tariff rate on commodity steel and aluminum imports from many countries.
Professional drivers hauling metal-based freight between these nations should note the potential for altered load patterns. Cross-border hauls of auto parts and industrial components, which often involve multiple trips, form a significant portion of U.S.-Mexico freight volumes. The U.S. and Mexico share deeply integrated supply chains where metal parts routinely cross borders several times during production.
- Integrated manufacturing: Raw steel or aluminum processed across borders into semi-finished goods.
- Tariff application: Duties on full product value, not just metal content.
- Impact on imports: Higher costs for goods entering the U.S. from Mexico and Canada.
Certain exemptions and rules would apply under the planned changes. For aluminum and steel derivative products:
- EU aerospace exemption: Covers products listed by HTSUS classification meeting scope limitations in U.S. Note 2(v)(xviii), Subchapter III, Chapter 99, HTSUS.
- Japan aerospace exemption: Applies to products under the WTO Agreement on Trade in Civil Aircraft, excluding unmanned aircraft.
- Stacking provision (March 4 to June 4, 2025): Goods subject to Section 232 tariffs on automobiles, auto parts, or tariffs on Canadian- and Mexican-origin goods are exempt from Section 232 tariffs on aluminum or steel derivatives during this period.
All existing country exclusions from Section 232 tariffs on aluminum and derivative aluminum articles would be revoked.
Drivers familiar with North American lanes understand the complexity of these chains. A load of steel coils might head south from a U.S. mill to a Mexican fabricator, return north as stamped parts, then cross again as assemblies en route to a U.S. assembly plant. Tariffs calculated on full value could prompt manufacturers to rethink these flows, potentially consolidating production or sourcing domestically to minimize duties.
Freight volumes in these corridors have grown steadily under the USMCA trade agreement, which replaced NAFTA. Metal-intensive goods like vehicle frames, engine components, and machinery parts dominate drayage and long-haul routes between border crossings such as Laredo, Texas, and Nuevo Laredo, Mexico, or Detroit-Windsor between the U.S. and Canada.
The policy aims to protect domestic metal production but introduces friction in regional trade. Importers of derivative products face higher landed costs, which could influence order sizes, routing decisions, and backhaul opportunities for drivers.
Section 232 measures originated in 2018, imposing 25% tariffs on steel and 10% on aluminum, later adjusted to 50% on certain commodity forms. Exemptions and quota systems have evolved, but the core focus remains safeguarding U.S. metal industries amid global oversupply concerns.
For cross-border operators, monitoring proclamation details is key. Changes could affect load planning, especially for flatbed, dry van, and intermodal hauls carrying metal derivatives. Border wait times and inspection protocols might also adjust as trade volumes respond.
The integrated nature of these supply chains means even U.S.-origin metal, once processed abroad, returns under higher tariff exposure. This full-value approach closes a perceived loophole where derivative goods evaded duties based on limited metal content.
Auto sector integration exemplifies the stakes. U.S. vehicle production relies on parts shuttling between plants in all three countries. A tariff on the full value of a semi-finished auto component could ripple through pricing, potentially slowing export loads or shifting domestic sourcing.
Industrial supply chains follow a similar pattern, with machinery and equipment parts crossing borders repeatedly. Drivers on these runs may see changes in cargo manifests or frequency as companies adapt.
Temporary stacking rules offer short-term relief for auto-related freight through June 2025, prioritizing other targeted tariffs. Beyond that, full implementation could standardize the broader tariff landscape.
Revoking country exclusions simplifies the regime but eliminates prior carve-outs, broadening exposure for aluminum imports.
Professional drivers should track updates from U.S. Customs and Border Protection and trade authorities. Freight forwarders and shippers will likely provide guidance on compliant documentation for affected loads.
This overhaul underscores the interplay between trade policy and over-the-road operations. Reliable cross-border freight keeps these supply chains moving, and policy shifts like this one directly influence lane demand and profitability for independent operators.