June 17, 2026

Section 232 Full-Value Tariffs on Steel, Aluminum, and Copper Goods

Importers of metal goods have a new Section 232 problem: the duty base is no longer limited to the value of the metal content for many covered products under the current Federal Register Section 232 proclamation^[1]. Under the April 2026 restructuring of the steel, aluminum, and copper Section 232 regimes, the additional tariff can apply to the full customs value of the imported article, even when the good is a downstream or derivative product that includes non-metal components.

That shift matters because it changes the economics of importing metal-intensive finished goods. A product with embedded steel, aluminum, or copper may now face a tariff on the whole declared customs value rather than a narrower metal-content amount. For importers, customs brokers, ecommerce brands, manufacturers, and procurement teams, the practical takeaway is simple: do not assume the old metal-content calculation still applies.

This guide explains what changed, which goods are most exposed, how the 50%, 25%, 15%, and 10% treatments fit together, and what importers should do before their next entry.

Quick Answer

Section 232 full-value tariffs mean many covered steel, aluminum, copper, and derivative goods can face additional duties on the full customs value entered with CBP, not just the value of the covered metal content. Federal Register proclamation for the April 2026 changes describes 10% to 50% additional duties on covered goods from all countries, while later White House updates changed some treatment and annex rules. Importers should confirm the HTS classification, Chapter 99 line, origin treatment, metal documentation, entry date, and landed-cost impact before shipping. See related Attahir Labs guides on Section 232 tariff basics and landed-cost calculation. Sources: Federal Register proclamation^[1], April 2026 Federal Register proclamation^[1], and June 2026 White House update^[2].

What Section 232 Means

Section 232 of the Trade Expansion Act of 1962 allows the President to adjust imports when the Department of Commerce finds that an article is being imported in quantities or under circumstances that threaten to impair U.S. national security. The steel and aluminum Section 232 tariffs began in 2018 after Commerce investigations. Copper was brought into the same national-security framework later, after the administration initiated a copper investigation in 2025 and then imposed copper-related measures.

Unlike ordinary customs duties, Section 232 tariffs are not tied only to tariff classification and normal column 1 duty rates. They sit on top of ordinary duties and are implemented through Chapter 99 provisions of the Harmonized Tariff Schedule of the United States (HTSUS). That means an importer may owe the normal duty for the product's HTS classification plus an additional Section 232 duty if the article falls within a covered metal or derivative category.

The hard part is not the concept. The hard part is scope. Covered products can include basic steel, aluminum, and copper articles, but also downstream goods, derivative products, certain machinery and power equipment, and items that appear in the relevant annexes or HTS provisions. The classification, origin, metal composition, and effective date all matter.

The April 2026 Shift: Full Customs Value

The biggest change came from the April 2, 2026 proclamation, published in the Federal Register on April 9, 2026. Effective for goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern daylight time on April 6, 2026, the Section 232 duties on covered aluminum, steel, and copper articles and derivatives apply to the full customs value of the imported product, regardless of metal content.

CBP followed with implementation guidance stating that the April 2026 proclamation imposes 10% to 50% additional duties on the full customs value of certain steel, aluminum, and copper articles and derivatives from all countries, effective April 6, 2026.

Before this restructuring, many importers focused on the value of the covered metal content in a derivative article. That approach created documentation headaches: companies had to obtain bills of material, allocate value between metal and non-metal components, and defend those calculations if CBP questioned them. The full-value framework simplifies one part of the calculation but can sharply increase the duty exposure for finished goods.

For example, assume a covered imported component has a customs value of $10,000 and includes $3,000 of steel content plus electronics, plastic, machining, and assembly value. Under a metal-content approach, the Section 232 duty might have applied to the $3,000 steel value. Under a full-customs-value approach, if the product is covered by the relevant tariff provision, the additional Section 232 duty can apply to the full $10,000 customs value.

That difference is why importers should re-run landed cost calculations instead of relying on prior entry assumptions.

Which Rates Apply?

The April 2026 proclamation reorganized covered metal products into rate categories. The exact answer depends on the product, HTS classification, origin, metal content, and annex placement, but the general structure is:

• 50% additional duty for aluminum and steel articles, most copper articles, and certain derivative articles listed in Annex I-A, unless a lower special treatment applies.
• 25% additional duty for certain copper articles and aluminum or steel derivative articles listed in Annex I-B, unless a lower special treatment applies.
• 10% treatment for certain derivative articles where the relevant aluminum, steel, or copper content is entirely U.S.-origin under the applicable smelted/cast or melted/poured standard.
• Special treatment for certain United Kingdom products where the covered metal content meets the U.K. origin requirements.

The June 1, 2026 proclamation then modified the system again, effective June 8, 2026. It updated the annexes, changed the threshold for products to qualify as made "entirely" from American aluminum, steel, or copper from 95% to 85%, and introduced additional temporary treatment for specified categories. For certain products listed in Annex I-C, the proclamation also provided a 25% structure through December 31, 2027, with special treatment for some jurisdictions and for USMCA-qualified products of Canada and Mexico.

This is the part importers should treat carefully: "Section 232 metal tariff" is no longer a single rate. The duty can be 50%, 25%, 15%, 10%, 0%, or another effective result depending on which Chapter 99 provision applies and whether the product qualifies for a special carveout or modified rate.

Goods Listed Under More Than One Metal

Some products contain more than one covered metal. A finished product could include steel and aluminum, aluminum and copper, steel and copper, or all three. Federal Register proclamation for the April 2026 proclamation says goods listed as articles or derivatives of more than one metal are subject to only one of the respective duty rates established by the proclamation. In other words, the steel, aluminum, and copper Section 232 duties do not stack on top of one another just because a product contains multiple covered metals.

That does not mean the entry is simple. Importers still need to determine the right classification, Chapter 99 reporting, origin treatment, and whether another tariff regime applies. But for the metal Section 232 regimes themselves, CBP's guidance makes clear that a covered good appearing under more than one metal category should not be charged multiple Section 232 metal rates for the same entry.

Goods With No Steel, Aluminum, or Copper Content

CBP also states that goods specified in the annexes that do not contain any aluminum, steel, or copper content are not subject to the April 2026 proclamation's duties. This matters for importers whose products fall under broad HTS descriptions or derivative lists but whose actual product composition does not include the relevant metal.

Do not treat that as a casual exemption. If you plan to rely on the no-metal-content position, keep product specifications, supplier certifications, bills of material, engineering documents, and purchase records that support the claim. CBP will care about what the product actually is, not just what the importer believed at the time of ordering.

Why Full-Value Treatment Changes Landed Cost

Full-value treatment can turn a manageable tariff into a margin-changing cost. The effect is strongest when the covered metal is only one part of the imported article but the product has a high finished value.

Consider three simplified examples:

• A steel fitting valued at $1,000 and made almost entirely of steel. A full-value duty base may not feel like a conceptual change because nearly all value is metal-related anyway.
• A piece of machinery valued at $20,000 with steel, aluminum, motors, electronics, software-enabled controls, and assembly value. If covered, a full-value duty base can pull the entire $20,000 into the Section 232 calculation.
• A copper-intensive electrical component valued at $5,000. If it falls under the covered copper or derivative provisions, the tariff base may include the full customs value, not merely the copper input.

That is why procurement teams should not ask only, "How much steel is in this product?" They should ask:

• Is the product listed in a covered HTS or annex category?
• Which Chapter 99 provision applies?
• Is the duty base the full customs value?
• Is the product eligible for U.S.-origin, U.K.-origin, USMCA, motorcycle manufacturing, low-metal-content, or other special treatment?
• Does any other trade action apply?

The answer can change the landed cost, the purchase price, and even the viability of a supplier relationship.

Compliance Checklist for Importers

Importers should build a repeatable review before placing orders or filing entries. At minimum:

1. Confirm the ordinary HTS classification.
2. Check whether the product appears in the current Section 232 steel, aluminum, or copper annexes or Chapter 99 provisions.
3. Identify the applicable entry date, because April 6, 2026 and June 8, 2026 are key effective dates.
4. Determine whether the duty applies to full customs value.
5. Confirm country of origin and any special origin rule for metal content.
6. Collect supplier documentation for melt and pour, smelt and cast, copper origin, product composition, and bills of material.
7. Test whether special treatments apply, including U.S.-origin metal, U.K.-origin metal, USMCA-qualified Canada or Mexico products, motorcycle parts, or other carveouts.
8. Check whether the product is excluded from the revised scope or listed in an annex that removed low-metal-content items.
9. Calculate total duty exposure, including ordinary duties and other additional tariffs.
10. Keep a written classification and tariff memo for audit support.

The most common mistake is treating Section 232 as a surcharge that can be calculated at the end of the import process. For covered goods, the tariff can be large enough that classification and duty modeling belong at the sourcing and pricing stage.

Documentation CBP May Expect

For steel goods, importers should be ready to support whether the steel was melted and poured in the United States, the United Kingdom, or another country, depending on the treatment claimed. For aluminum, the relevant concepts include smelt and cast information. For copper, smelt and cast documentation may also matter when claiming U.S.-origin treatment.

Useful records can include:

• Supplier declarations.
• Mill test certificates.
• Bills of material.
• Engineering specifications.
• Product composition sheets.
• Purchase orders and invoices.
• Production records showing country and facility.
• Customs broker classification notes.
• Prior CBP rulings, if applicable.

If a supplier cannot provide documentation, do not assume the lower rate applies. A lower rate without records is a future penalty risk, not a savings strategy.

Canada, Retaliation, and Cross-Border Planning

The U.S. Section 232 rules also affect companies moving goods across the U.S.-Canada border. Canada has used surtax measures in response to U.S. steel and aluminum actions, and CBSA guidance has identified surtaxes on certain steel derivative goods imported into Canada. For example, CBSA Customs Notice 25-33 states that effective December 26, 2025, certain steel derivative goods imported into Canada are subject to a 25% surtax on the value for duty, with the schedule listing covered goods.

That does not mean every U.S. Section 232 product has the same treatment in Canada. The Canadian surtax system has its own orders, schedules, remission rules, and customs requirements. But companies with North American supply chains should model both sides. A product imported into the United States may face U.S. Section 232 duties; a related movement into Canada may face Canadian surtax rules; and a finished good crossing again may trigger additional classification and origin questions.

For USMCA-qualified products of Canada and Mexico, the June 2026 U.S. proclamation also created special treatment for certain listed aluminum and steel articles, applying a 25% duty only to non-U.S. content and setting a minimum effective duty structure. That provision is narrow and technical, but it underscores the main point: North American origin planning now belongs inside the tariff calculation, not after it.

WTO and Economic Context

Section 232 tariffs have been controversial since the original steel and aluminum measures. WTO disputes challenged U.S. steel and aluminum actions, including whether the measures were justified under national security rules. WTO dispute materials identify the challenged measures as duties and related measures imposed by the United States on steel and aluminum imports under Section 232.

The economic debate is also active. The U.S. International Trade Commission has studied the economic impact of Section 232 and Section 301 tariffs on U.S. industries. Its 2023 report estimated the trade, production, and price effects of earlier steel and aluminum tariffs, while noting limitations in modeling derivative products because the data needed for those narrower categories was more disaggregated.

Tax Foundation analysis has generally treated tariffs as taxes on imports that raise costs for U.S. households and businesses. Its recent tariff tracking estimates that newly announced and imposed Section 122 and Section 232 tariffs will increase taxes per U.S. household in 2026. Importers do not need to take a position on the policy debate to recognize the operating reality: the duty bill lands at entry, and the cost must be priced, absorbed, passed through, engineered around, or avoided through compliant sourcing.

Practical Strategies

The best strategy depends on the product, supplier base, and customer contracts. Common options include:

• Reclassify only when the existing classification is genuinely wrong. Do not force a lower-risk HTS code.
• Negotiate supplier documentation up front, especially for melt and pour, smelt and cast, and copper origin.
• Compare suppliers by duty-paid landed cost, not invoice price.
• Redesign products only where engineering, compliance, and commercial needs support it.
• Consider U.S.-origin metal inputs when the lower Section 232 treatment changes the economics.
• Review Canada and Mexico supply chains for USMCA treatment, but do not assume USMCA eliminates Section 232 duties.
• Add tariff change clauses to customer contracts and purchase agreements.
• Use broker review and customs counsel for high-value or uncertain products.

The goal is not to make every shipment tariff-free. The goal is to know the duty exposure before the shipment moves.

FAQ

What are Section 232 full-value tariffs?

They are additional duties imposed under Section 232 that apply to the full customs value of covered steel, aluminum, copper, and derivative products. Under the April 2026 changes, Federal Register proclamation says certain covered metal goods and derivatives are subject to 10% to 50% additional duties on the full customs value, effective April 6, 2026.

Does the tariff apply only to the metal content?

For many covered products, no. The April 2026 proclamation shifted the duty base to the full customs value of the imported product, regardless of metal content. Importers should confirm the current Chapter 99 provision and any later modifications before filing.

What is the main Section 232 rate for steel, aluminum, and copper goods?

The most exposed category is 50% for listed aluminum and steel articles, most copper articles, and certain derivative articles. Other covered products may face 25%, 15%, 10%, or special treatment depending on the annex, origin, product category, and effective date.

Do steel, aluminum, and copper Section 232 tariffs stack?

Federal Register proclamation says goods listed as articles or derivatives of more than one metal are subject to only one of the respective duty rates established by the April 2026 proclamation. That means the metal Section 232 rates do not stack merely because a product contains multiple covered metals.

Are Canada and Mexico products exempt?

Not automatically. Some USMCA-qualified Canada and Mexico products received special treatment under the June 2026 proclamation for certain listed aluminum and steel articles, but that treatment is technical and limited. Importers must check the exact product list, origin status, and non-U.S. content calculation.

What records should importers keep?

Keep HTS classification support, supplier declarations, bills of material, mill test certificates, melt and pour records for steel, smelt and cast records for aluminum and copper, commercial invoices, product specifications, and any written broker or counsel analysis.

What if my product is listed but contains no steel, aluminum, or copper?

Federal Register proclamation says goods specified in the annexes that do not contain any aluminum, steel, or copper content are not subject to the April 2026 proclamation's duties. Importers should keep evidence proving the absence of covered metal content.

Should ecommerce sellers care about Section 232?

Yes. Sellers importing cookware, fixtures, tools, hardware, equipment parts, electronics components, or other metal-bearing goods may face higher landed costs. A small change in duty treatment can erase margin on marketplace products.

CTA: Check Your Duty Exposure Before You Import

If your product contains steel, aluminum, or copper, do not wait until entry filing to estimate the tariff. Use TariffShield's duty calculator to model landed cost, compare supplier scenarios, and flag products that need broker or customs counsel review before the shipment moves.

The following official and specialist sources support the article body citations.

• Federal Register, "Strengthening Actions Taken To Adjust Imports of Aluminum, Steel, and Copper Into the United States," Proclamation 11021, published April 9, 2026^[1].
• The White House, "Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper into the United States," June 1, 2026^[2].
• Bureau of Industry and Security, "Section 232 Steel and Aluminum"^[3].
• Federal Register, "Addressing the Threat to National Security From Imports of Copper," Executive Order 14220, published February 28, 2025^[8].
• U.S. International Trade Commission, HTS lookup^[4] and USITC Publication 5405, "Economic Impact of Section 232 and 301 Tariffs on U.S. Industries," March 2023.
• World Trade Organization, DS544, "United States - Certain Measures on Steel and Aluminium Products"^[6].
• Canada Border Services Agency, Customs Notice 25-33, "Steel Derivative Goods Surtax Order"^[5].
• Tax Foundation, "Tracking the Economic Impact of U.S. Tariffs and Retaliatory Actions"^[7].

Disclaimer

This article is for general informational purposes only and is not legal, tax, customs, or trade compliance advice. Tariff treatment depends on the exact product, HTS classification, country of origin, entry date, Chapter 99 reporting, product composition, and current agency guidance. Importers should consult a licensed customs broker or qualified trade counsel before relying on any tariff position.