TRADE ADVISORY UPDATE

Update to April 2026 Section 232 Tariff Framework (Aluminum, Steel, Copper) 

Date: June 4, 2026 
Effective Date: June 8, 2026 
 

Executive Update 

On June 1, 2026, the White House issued a follow-on proclamation modifying the Section 232 tariff regime established under the April 2, 2026 action. This update introduces targeted refinements to tariff scope, rate eligibility, and U.S.-content requirements while maintaining the underlying tariff structure. 

Key Enhancements Introduced in June 2026 

The June updates expand the 15% tariff category to additional industrial equipment, broaden derivative product coverage, reduce the U.S.-content threshold from 95% to 85%, and clarify partner-country treatment. 

Annex Structure and References 

The applicability of Section 232 tariffs is determined by HTS classification and corresponding annex placement: 

• Annex I-A (50% tariff): Covers primary metal articles (e.g., raw steel, aluminum, copper products)  

• Annex I-B (25% tariff): Covers derivative products with substantial metal content  

• Annex I-C (modified treatment): Provides specialized handling for certain derivative goods  

• Annex II (excluded products): Explicitly removes products from Section 232 scope  

• Annex III (15% temporary relief): Identifies goods eligible for reduced tariff treatment through 2027  

• Annex IV (definitions and rules): Establishes how metal content and scope are calculated 

Reference Annex Document: 
https://www.whitehouse.gov/wp-content/uploads/2026/04/ANNEXES-I-A-I-B-II-III-IV.pdf 

Importance of HTS Classification and Annex Alignment 

Under the current Section 232 framework, HTS classification directly drives tariff liability. Products must be mapped to the correct annex based on HTS subheading, and even minor classification differences may result in materially different duty rates. 
 
Tariff outcomes (50%, 25%, or 15%) are determined by annex assignment, not product use. Annex IV introduces metal content thresholds, requiring importers to substantiate classification with bill of materials, metal weight, and origin data. 
 
The interaction between Annex I-B, I-C, and III creates both risk and opportunity, particularly where products may qualify for reduced treatment. Improper classification or insufficient documentation may result in misapplied duties and potential CBP exposure. 

CBP Implementation Guidance (CSMS #68855869) 

CBP guidance confirms that Section 232 duties apply to the full entered value and that annex classification governs entry filing requirements. Importers must ensure accurate HTS classification, correct Chapter 99 reporting, and proper documentation of metal content and origin. 

Conclusion 

The June 2026 updates refine the April framework by expanding targeted relief while maintaining protective tariffs. The importance of accurate classification, documentation, and planning has increased significantly. 

Disclaimer

This advisory is for informational purposes only and does not constitute legal advice. Information is subject to change and companies should consult professional advisors before taking action. 

How Trade Consulting Can Support 

Trade Consulting provides targeted support to help companies manage the complexity of the Section 232 framework while identifying opportunities to reduce duty exposure.    Services include HTS classification and annex mapping, evaluation of eligibility for reduced tariff treatment, U.S.-content and sourcing strategy analysis, and duty exposure modeling. Trade Consulting also supports documentation readiness, including BOM validation and metal content substantiation, to assist with CBP compliance and audit defense.  Contact our Trade Services Team to evaluate your risk and identify opportunities for tariff optimization.