Trump Revises U.S. Tariffs on Steel, Aluminum and Copper; Changes Take Effect June 8, 2026

President Donald Trump has issued a new proclamation revising U.S. tariffs on imported steel, aluminum and copper, keeping the administration’s broad Section 232 metals regime in place while refining how it applies to specific products. The White House published the order June 1, and the changes take effect for goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. EDT on June 8, 2026.

The proclamation, titled “Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper into the United States,” is signed by Trump and cites Section 232 of the Trade Expansion Act of 1962 and Section 604 of the Trade Act of 1974. In practical terms, the order preserves the administration’s high-tariff framework: many core metal products listed in Annex I-A remain subject to a 50% ad valorem tariff, meaning a duty based on the value of the goods, while many derivative products in Annex I-B generally face a 25% tariff. Products covered by Annex III are eligible for a temporarily reduced 15% rate, including newly added agricultural equipment and certain residential HVAC systems and components.

The order also makes several targeted changes to how the tariffs are applied. It lowers the domestic-content threshold used to determine when a product is treated as effectively made with U.S.-sourced metal. “The current threshold of 95 percent shall be modified to 85 percent,” the proclamation says. It also adds aluminum lithographic plates and steel racks to derivative tariff coverage. And it says tariffs on mobile industrial equipment and machinery will be temporarily modified to account for their role in productive economic activity.

Some temporary treatment for certain aluminum and steel articles will remain in place through 11:59 p.m. EST on Dec. 31, 2027, according to the proclamation and its annexes.

The order also sets out country- and content-specific rules. For products from Argentina, Ecuador, El Salvador, Guatemala, Japan, South Korea, Liechtenstein, Switzerland, Taiwan, the United Kingdom and European Union member states, the additional Section 232 duty is structured so that the total of the normal Column 1 duty and the extra duty is at least 15%, unless the Column 1 duty is already 15% or more.

For Canada and Mexico, the additional duty applies only to the non-U.S. content of the product. But the proclamation says the total effective duty cannot be less than 15% ad valorem, subject to Annex IV and future guidance from U.S. Customs and Border Protection.

The June 1 order expressly amends and relies on earlier metals proclamations: Proclamation 9704 on aluminum and Proclamation 9705 on steel, both issued March 8, 2018; Proclamation 10962 on copper, issued July 30, 2025; and Proclamation 11021, issued April 2, 2026. Together, those actions form the core of the administration’s Section 232 program, which uses a national security trade law to impose tariffs on metals imports.

The latest revision also comes after a major legal development earlier this year. On Feb. 20, 2026, the U.S. Supreme Court held that the International Emergency Economic Powers Act, a separate law often used in sanctions and emergency economic actions, does not authorize tariffs. That ruling increased the importance of other trade authorities, including Section 232, for tariff action.

Implementation now shifts to federal agencies. The proclamation directs the secretary of Commerce, in consultation with the U.S. trade representative, the chair of the U.S. International Trade Commission, the Department of Homeland Security and others, to make any necessary changes to the Harmonized Tariff Schedule through notice in the Federal Register. “Effective with respect to goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern daylight time on June 8, 2026, subchapter III of chapter 99 of the HTSUS is modified as provided in Annex IV to this proclamation,” the order states. Importers and manufacturers now await the technical tariff-schedule updates and CBP guidance before the new rules take effect.