A new American customs rule took effect on October 14, 2026, adding another layer of complexity to Canadian manufacturers’ trade with their largest export market. The U.S. Department of Commerce has established how American-made components and domestically processed steel, aluminum and copper should be counted when certain imports qualify for reduced tariffs.
The change implements part of President Donald Trump’s June trade proclamation and provides a clearer definition for goods crossing the border under the Canada-United States-Mexico Agreement. It does not eliminate metal tariffs or create a blanket exemption for Canadian exports.
For companies operating across North America’s interconnected industrial supply chains, the distinction carries financial consequences. Products containing qualifying American material may receive more favourable treatment, but the benefits depend on their classification, origin and documented content. Importers must now navigate rules that can determine how much duty is owed on individual shipments.
The New Rules Took Effect on October 14
The U.S. Department of Commerce published its new guidance in the Federal Register on October 14, 2026. The notice, issued by the Bureau of Industry and Security, became effective at 12:01 a.m. Eastern Time for covered goods entered for consumption or withdrawn from customs warehouses for consumption. It explains how U.S. Customs and Border Protection should assess the American content of eligible Canadian and Mexican products.
The announcement follows Presidential Proclamation 11032, signed on June 1, which modified existing Section 232 tariffs on steel, aluminum, copper and certain manufactured products. Most of those underlying changes took effect on June 8. What is new in October is the government’s formal interpretation of U.S. content for a particular tariff provision. This distinction matters because the notice does not introduce a new universal tariff on Canadian metals. Instead, it clarifies the calculations used to determine preferential treatment for qualifying shipments within a much broader tariff system.
What Washington Now Counts as American Content
Under the October notice, American content includes the value attributable to parts wholly obtained, entirely produced or substantially transformed in the United States. The definition also recognizes qualifying American metals that have undergone specified domestic production processes. Steel must have been melted and poured in the United States, while aluminum and copper must have been smelted and cast there.
The government specifies that metal value can be counted only to the extent it has not already been included in the value of qualifying American parts. This prevents the same material from being counted twice. For example, a Canadian manufacturer might incorporate steel originally produced in an American mill into a finished product that later returns to the U.S. market. Depending on the finished product’s tariff classification and documentation, that American material could contribute to its eligible U.S. content. The location of final assembly alone does not establish how much American value the shipment contains.
The 25% Duty Comes With a 15% Minimum
For qualifying Canadian and Mexican products in the special mobile-machinery category, the June proclamation allows a 25% Section 232 duty to be calculated on non-U.S. content instead of the entire customs value. But Washington imposed a significant limit: the effective charge under this provision cannot fall below 15% of the imported product’s value. Customs instructions implement that floor by recognizing no more than 40% of a covered shipment’s value as duty-free U.S. content.
Consider a hypothetical qualifying forklift shipment valued at US$100,000. If US$20,000 represents eligible American content, the 25% tariff on the remaining US$80,000 would amount to US$20,000. If American content reaches US$50,000, only US$40,000 receives the exemption, leaving a US$15,000 Section 232 charge. These examples illustrate this specific provision, not necessarily the shipment’s total duty bill. Other applicable duties can change the amount ultimately collected at the border. The calculation offers potential relief, but it does not eliminate the tariff.
The Special Break Does Not Cover Every Metal Shipment
The relevant exemption is tied to a category of mobile industrial equipment and machinery identified in Annex I-C of the June proclamation. It includes products such as forklifts, bulldozers, graders, mobile cranes and some related parts, subject to their precise tariff classifications. That is considerably narrower than all Canadian steel, aluminum and copper exports. Primary metals and many other manufactured products remain governed by separate Section 232 rates and rules.
Washington has also established other forms of metal-content relief. In June it lowered the threshold for certain products to qualify as made essentially from American metal, from 95% to 85% of the applicable metal content by weight. Eligible products can receive a reduced 10% rate under a different provision. That weight-based qualification must not be confused with the value-based U.S.-content calculation clarified in October. A Canadian factory shipping machinery and a smelter exporting unwrought aluminum may therefore face very different border calculations, even though both use metals central to the trade dispute.
CUSMA Eligibility Still Matters at the Border
The October definition applies to products of Canada and Mexico that qualify for preferential treatment under the Canada-United States-Mexico Agreement. Merely shipping a product from Ontario to Michigan does not establish eligibility. Importers must determine whether the finished good meets the agreement’s applicable origin requirements and whether its tariff classification falls within the narrower special provision. A product can qualify under CUSMA and still face a Section 232 duty.
Consider an industrial machine assembled in Canada using American components. Its manufacturer may have a strong case for documenting some U.S. value, but that alone does not guarantee preferential treatment. The finished machine must also satisfy the relevant agreement rules. Conversely, a CUSMA-qualifying product with little American content can receive only a modest reduction, or none, under this mechanism. The distinction reinforces why customs classification, origin qualification and the calculation of American content are three separate questions for a business preparing an export shipment.
Customs Reporting Will Demand Careful Documentation
U.S. Customs and Border Protection already established a two-line filing method for covered Canadian and Mexican derivative steel shipments. Importers use tariff heading 9903.82.20 for the dutiable portion and 9903.82.21 for qualifying American content, up to the 40% limit. The relevant lines must carry consistent underlying product classifications and country-of-origin information. The October notice supplies the definition behind those calculations rather than introducing an entirely new filing system.
For companies, the practical task is connecting customs declarations with reliable supplier records. Invoices, production records and metal-origin information may be needed to support the claimed value. Customs continues to require countries of melt and pour for covered steel products and smelt and cast for covered aluminum products. It has indicated that additional copper-origin reporting instructions will follow for specified goods. The June proclamation also authorizes penalties where Customs finds deliberate deception or fraud over American content. Accurate paperwork can affect both the duty owed and the risk of costly disputes.
Canadian Steel Producers Are Already Under Pressure
The change arrives after a difficult period for Canada’s steel industry. Natural Resources Canada reports that iron and steel exports to the United States were worth approximately C$14.4 billion in 2025. The Bank of Canada, assessing trade restrictions in April 2026, said Canadian steel exports to the American market had fallen by roughly half under steep tariffs. Production and employment declined as well, although government measures helped support domestic activity.
Southern Ontario is especially exposed. Federal economic development material identifies two of Canada’s three largest steel producers in the region and places Ontario’s 2025 steel and aluminum exports to the United States at C$6.5 billion, representing 94% of the province’s exports in those categories. For a mill worker or a supplier servicing heavy machinery, the consequences can appear in reduced shifts, cautious hiring and uncertain orders. The new content definition may benefit particular finished products, but it does not remove the broader tariff pressure on Canadian-produced steel.
Quebec’s Aluminum Industry Faces a Different Calculation
Aluminum tells a related but distinct story. Natural Resources Canada recorded approximately C$13.8 billion in Canadian aluminum exports to the United States in 2025. Much of Canada’s production is concentrated in Quebec, where smelting supports industrial communities and downstream manufacturers. In its April assessment, the Bank of Canada said producers faced a 50% U.S. tariff on aluminum sales, while many derivative products faced 25%. Shipments rebounded from an earlier plunge, but the bank also reported lower margins when producers redirected some sales toward Europe.
The October rule does not turn Quebec-smelted metal into American-origin content. It recognizes aluminum smelted and cast in the United States when that value is present in a product eligible for the special calculation. A Canadian manufacturer incorporating such material into industrial equipment may be in a different position from a Canadian primary aluminum producer selling ingots. That distinction could affect sourcing discussions across the supply chain without guaranteeing a change in any company’s orders or prices.
Copper Is Included, but Its Treatment Is Not Identical
Copper is explicitly mentioned in the October definition, but that does not give every copper shipment the special 25%-on-non-U.S.-content treatment. American-smelted and cast copper can count toward the U.S. value of an otherwise eligible product. Standalone copper articles and other metal-intensive goods must be assessed under their own tariff classifications and the separate rules governing them. The broader tariff regime also contains an 85%-by-weight American-metal threshold for certain reduced-rate products.
Canada has a substantial economic stake in copper trade. Natural Resources Canada puts 2025 copper exports to the United States at about C$5.6 billion. The metal is widely used in electrical wiring, equipment and infrastructure. Yet copper’s market experience has differed from steel’s: the Bank of Canada reported in April that copper exports to the United States were 40% above their 2024 average, as exporters shifted toward products outside the tariff measures. The new content definition is therefore another variable, not evidence of a uniform downturn.
Businesses Face Another Deadline Beyond October
The immediate challenge is determining which shipments qualify for the value-based adjustment and documenting the American content that Customs will recognize. Importers and their Canadian suppliers may revisit component records, purchase contracts and pricing arrangements. Some businesses could benefit from a lower effective Section 232 rate; others will remain fully exposed to existing tariffs. The rules create incentives to use American-produced inputs, but their actual effect on sourcing, employment and consumer prices cannot yet be measured from the notice alone.
There is also a deadline beyond this week’s implementation. The special tariff arrangement for covered mobile industrial equipment is scheduled to run through December 31, 2027, with different provisions taking effect on January 1, 2028, unless policy changes. Canada has meanwhile imposed counter-tariffs on selected American products, and the North American agreement faces another joint review in 2027. For a manufacturer planning equipment purchases or hiring, stability may prove as valuable as the tariff discount itself. The new definition settles one customs question while leaving the wider trade relationship unsettled.
