Trade Policy Brief: Metals Tariff Overhaul
What the April 2 Proclamation Means for Your Business
The Trump Administration’s April 2, 2026 proclamation restructures the Section 232 tariff regime for aluminum, steel, and copper imports and their derivative products — shifting the cost basis from metal content to full customs value and raising headline rates to 50 percent for most covered goods.
Note - A June 1 follow-on proclamation extended the framework to industrial and agricultural equipment.
Bottom line for executives: The April 2 proclamation is not a routine tariff adjustment. It changes how duties are calculated — from the metal content of a product to its full customs value — and more than doubles effective rates for many derivative goods. Middle-market companies across manufacturing, construction, energy, and distribution face materially higher import costs. The compliance burden is also expanding: customs declarations must now identify smelt and cast origin to qualify for reduced rates.
Issues and Background
Section 232 of the Trade Expansion Act of 1962 permits the President to restrict imports that threaten national security. The Trump Administration first invoked Section 232 for steel and aluminum in 2018 and extended the regime to copper in July 2025. The April 2, 2026 proclamation (Proclamation 11021) is the most sweeping modification to that framework in its eight-year history.
The central change is how duties are calculated. Prior to April 6, 2026, the Section 232 duty applied to the metal content of an import — meaning a steel component embedded in a finished product was taxed only on the value attributable to the steel, not the value of the whole product. The new regime applies the duty to the full customs value of the imported product, regardless of metal content. For highly engineered or finished goods with significant value-added processing, the effective duty increase is substantial.
The proclamation was effective for all goods entered for consumption on or after 12:01 a.m. Eastern on April 6, 2026.
Policy Impact
This proclamation consolidates and escalates a decade-long trend toward using Section 232 as a broad-based industrial policy instrument rather than a narrowly targeted trade remedy. Several features of the new structure are particularly significant for business planning.
No formal product-inclusion process. Prior proclamations established a public rulemaking mechanism through which companies could petition for inclusion or exclusion of specific derivative products. Proclamation 11021 terminates that process and replaces it with a joint administrative determination by the Secretary of Commerce and the U.S. Trade Representative — a faster, less transparent mechanism. Companies can no longer rely on a predictable exclusion pathway if their products are swept into the derivative category.
Trade-agreement partners and future negotiations. The proclamation creates a new category — “Trade Agreement Partners” — that currently includes the UK, EU, Japan, South Korea, Mexico, Canada, and any future bilateral agreement partners. Drawback eligibility and certain reduced rates depend on this status. This structure is designed to give the administration leverage in ongoing trade talks, but it also means rate exposure can shift based on diplomatic developments outside a company’s control.
Canada and Mexico USMCA treatment. The June 1 proclamation introduced a special provision for USMCA-qualifying imports from Canada and Mexico: the 25 percent Annex III rate applies only to non-U.S. content, subject to a 15 percent floor. This is a meaningful carve-out for manufacturers with cross-border supply chains, but its benefit depends on accurate and defensible U.S.-content accounting. CBP is authorized to assess penalties for misrepresentation.
June 2028 cliff. The reduced rates on Annex III products (industrial machinery, agricultural equipment, HVAC systems) are explicitly temporary, expiring December 31, 2027. Companies planning capital equipment acquisitions should account for the rate reverting to 25 percent in 2028 when modeling multi-year procurement timelines.
Company Impact
The industries with the most direct exposure are those that import finished or semi-finished goods with significant aluminum, steel, or copper content — broadly: manufacturing, construction, energy infrastructure, industrial distribution, and agricultural equipment dealers.
For middle-market companies in these sectors, the practical consequences run across several dimensions. Landed costs increase immediately on covered imports, and because the duty now applies to full customs value rather than metal content, cost modeling built on prior tariff assumptions is no longer valid. Companies with contracts that include tariff pass-through provisions should review those clauses now: the change in calculation methodology may not be captured by language written under the prior regime.
Procurement teams that source from multiple countries may find new arbitrage opportunities — particularly if UK or EU sourcing qualifies for lower rates — but realizing those savings requires documentation systems capable of certifying metal origin at the smelt and cast level, not just country of manufacture.
Energy-sector companies are broadly affected. Pipeline components, electrical infrastructure, compressors, heat exchangers, and other capital goods used in oil and gas, renewables, and utilities commonly contain substantial aluminum, steel, and copper content. Given that these goods often carry significant value-added manufacturing costs over and above their raw material content, the shift to full-value tariffs is particularly impactful in this sector.
Regulatory Compliance Note
CBP now requires importers of copper articles to identify the countries where copper was smelted and cast, and to provide that information at the time of entry. Similar documentation requirements apply to aluminum and steel for companies claiming reduced rates based on U.S.-origin metal content. Companies without robust traceability systems should treat this as an immediate operational priority — the enforcement mechanism is in place and CBP is authorized to impose penalties for misrepresentation, not just to deny reduced-rate eligibility.
Key Dates
April 2, 2026 - Proclamation 11021 signed. Full-value tariff structure announced; derivative product scope revised.
April 6, 2026 - Proclamation 11021 effective. 50% / 25% rates on covered goods begin. All new entries subject to full-value calculation.
June 1, 2026 - Follow-on proclamation signed. Agricultural equipment and residential HVAC added to 15% temporary category; USMCA U.S.-content rules added; U.S.-origin metal threshold lowered from 95% to 85%.
June 8, 2026 - June 1 proclamation effective. Annex I-C products now carry 25% standard rate with country-specific blended rates for key allied trading partners.
July 2026 - 90-day update due. Commerce and USTR must report to the President on import status, domestic production levels, and any recommended further action.
Dec. 31, 2027 - Annex III temporary rates expire. Industrial and agricultural equipment rates revert from 15% to 25% standard rate on January 1, 2028.
Recommended Actions
Audit your import portfolio immediately. Identify all products that contain aluminum, steel, or copper — including finished goods and components classified as derivative articles — and map them against the Annex I-A, I-B, and III product lists. Update your landed-cost models to reflect full-value tariff calculations.
Review contracts with tariff pass-through provisions. The change from metal-content to full-value calculation is not a simple rate change — it is a methodological change. Confirm whether your contract language captures it, and negotiate updates where it does not.
Build or upgrade supply-chain documentation systems. Qualifying for the 10% U.S.-origin rate, or for any reduced allied-country rate, requires smelt-and-cast origin certification at the supplier level. This is now a customs compliance requirement, not merely a strategic option.
Evaluate UK and EU sourcing for rate arbitrage. Where feasible, sourcing from Trade Agreement Partner countries can reduce duty exposure materially. Model this against total cost of switching, including lead times and supplier qualification costs.
Scenario-plan capital equipment acquisitions with the Dec. 31, 2027 cliff in mind. If your company imports industrial machinery, agricultural equipment, or HVAC systems, the temporary 15% rate provides a window. Factor the 2028 rate reversion into multi-year procurement and capital planning.
Engage CBP proactively on compliance posture. CBP has explicit enforcement authority for misrepresentation of U.S. content and smelt/cast origin. Companies that establish documented compliance programs are better positioned in the event of audits or disputes.