Section 232 Tariffs and Mill Certificates: How We Help You Prove Metal Origin and Avoid 200% Duties

Picture this: your aluminum shipment clears customs, then an audit hits. You cannot produce a mill certificate proving where the metal was smelted and cast. Overnight your duty rate jumps to 200 percent. We see this scenario too often, and it is exactly why Section 232 compliance is top of mind for importers of steel, aluminum, and now copper.

The Challenge: Proving Origin Under Section 232

Section 232 tariffs have expanded beyond steel and aluminum to include copper, and government expectations have tightened. It is no longer enough to ask your supplier for the country of origin and put that on your commercial documents. You must validate the origin and the content of the metal that goes into your products so Customs can assess the correct duties.

There is ongoing debate about whether the tariff applies to raw metal or processed metal, and a case is currently pending at the Court of International Trade. Regardless of that outcome, one requirement is clear today. You need verifiable mill certifications that prove where the metal was poured, smelted, and cast, and you must be able to present them on request.

We approach Section 232 the same way we do USMCA and other free trade agreements. Free trade is not free of confusion. Precision, documentation, and repeatable processes are what keep duty exposure under control.

Mill Certificates Are Not Optional

A mill certificate, also called a mill test report or mill cert, is the foundation of 232 compliance for metals. It should identify:

• The mill and heat number
• Where the metal was poured, smelted, and cast
• Chemical composition and grade
• Applicable specifications and standards

Without that documentation, you risk default duty rates. For aluminum, we have seen automatic assignment of 200 percent when importers cannot substantiate origin and composition. What might have been 25 to 50 percent becomes a margin-killing charge.

Why Asking Your Supplier Is No Longer Enough

Many suppliers are reluctant to share upstream details. They worry about proprietary relationships or exposing their source mills. That is why contract language matters. If your purchase agreements do not explicitly require the supplier to provide mill certificates and supporting origin data upon request, you may be stuck when Customs asks for proof.

We advise clients to lock this requirement into supplier contracts, including the right to obtain documents under a non disclosure agreement and to have a third party manage and provide records directly to the government if needed.

Your Section 232 Action Plan

Here is how we help importers build a defensible, efficient program:

• Update supplier contracts to require timely delivery of mill certs, origin statements, and composition data, with audit rights and NDA provisions.
• Centralize documentation in a controlled repository tied to part numbers, suppliers, and entries.
• Map products to metal content, percentage by weight, and country of origin for each input documented by heat number.
• Establish a request, review, and approval workflow for new suppliers and materials.
• Prepare audit-ready packages that can be shared promptly with Customs.
• Leverage a third party, whether consulting, managed services, or a law firm, to collect, validate, and retain records, and to respond to government inquiries.

How Vigilant Global Trade Services Helps

We combine practical trade expertise with hands-on execution so you can keep shipments moving and reduce duty risk:

• Contract language and supplier onboarding playbooks tailored to Section 232, USMCA, and other free trade agreements
• Mill certificate collection, validation, and exception management
• A structured database of products, metal content, and country of origin tied to supporting documents
• Risk assessments that identify gaps and potential 232 exposure before audits
• Audit response readiness, including secure document sharing and NDA workflows
• Ongoing monitoring of Court of International Trade developments and regulatory changes

When suppliers hesitate, we step in as the neutral partner to obtain and safeguard sensitive documents while protecting your compliance position.

Key Takeaways

• Section 232 coverage has expanded to metals including copper, and enforcement expectations are higher.
• Mill certificates proving where metal was poured, smelted, and cast are essential.
• Missing documentation can trigger automatic duties up to 200 percent for aluminum.
• Put origin and documentation obligations into supplier contracts, and centralize records by part and heat number.
• A trusted third party can streamline collection, validation, and audit response.

Ready to Reduce Your 232 Risk?

If you import steel, aluminum, or copper, now is the time to tighten your origin validation program. We help you secure the right documents, structure the data, and respond confidently to government requests. Contact Vigilant Global Trade Services to schedule a consultation and get practical next steps tailored to your supply chain.