Trump Modifies 232 Tariffs on Aluminum, Steel, Copper with Expanded Derivative Rules

President Trump issues a new proclamation altering the Section 232 tariff regime for aluminum, steel, and copper imports, effective June 8, 2026. The changes expand derivative coverage (including agricultural equipment and certain residential HVAC components) and adjust tariffs: 25% on listed metal products, 10% on derivative articles that are entirely US-made in metal content, and a temporary 15% reduced rate for selected derivative products; aluminum lithographic plates and steel racks are now covered derivatives; the threshold for “made entirely from American” drops from 95% to 85%. For Canada and Mexico under USMCA, 25% applies only to non-U.S. content with a floor of 15%. Beginning 2028, rates will align with Proclamation 11021. The Secretary of Commerce and other agencies will monitor and adjust as needed to address national security concerns and ensure implementation across HTSUS changes.