A new set of U.S. tariff instructions is adding another layer of complexity to Canada’s already strained trading relationship with Washington. The U.S. Department of Commerce has issued guidance explaining how American-made components and domestically processed steel, aluminum, and copper will be counted when calculating duties on certain Canadian and Mexican products.
The guidance was filed on October 9, 2026, and is scheduled to take effect on October 14. It addresses a preferential tariff calculation introduced earlier this year for certain industrial machinery and equipment qualifying under the Canada–United States–Mexico Agreement (CUSMA).
For Canadian manufacturers, the distinction could influence production costs, sourcing decisions, and contracts with American customers. However, the clarification does not eliminate existing metal tariffs or provide a blanket exemption for Canadian exports. Instead, it establishes more precise rules within a trade system where product classification and material origin can significantly affect the final duty owed.
Washington Sets October 14 Implementation Date for New Guidance
The U.S. Department of Commerce’s Bureau of Industry and Security issued a two-page notice on October 9 explaining how U.S. Customs and Border Protection should assess American content in certain Canadian and Mexican products. The document, identified as Federal Register document 2026-20938, is scheduled for publication on October 14. Its provisions will apply to covered goods entered for consumption, or withdrawn from a customs warehouse for consumption, beginning at 12:01 a.m. Eastern Time on that date. The October 14 date is therefore an implementation date, not a general deadline requiring every Canadian exporter to submit new paperwork.
The clarification implements a provision of Presidential Proclamation 11032, signed by President Donald Trump on June 1, 2026. That proclamation modified existing national-security tariffs under Section 232 of the Trade Expansion Act of 1962. Although the October notice is relatively short, its significance lies in providing a formal definition for calculating American content. That definition matters to eligible manufacturers attempting to obtain lower effective duties when exporting equipment assembled with components sourced from both sides of the border.
American-Made Parts and Metals Receive a Clearer Definition
Under the new guidance, American content is determined using two principal categories. The first includes the value of parts wholly obtained, entirely produced, or substantially transformed in the United States. The second includes the value attributable to steel melted and poured in America, aluminum smelted and cast there, and copper smelted and cast domestically. Metal value is included through this second category only to the extent it has not already been counted as part of the value of an American-produced component.
This distinction is particularly relevant to businesses operating integrated North American supply chains. A Canadian manufacturer might assemble equipment using American steel, Canadian labour, and specialized components purchased from several suppliers. Under the guidance, qualifying American-origin inputs can contribute to the product’s U.S.-content value even when final assembly occurs in Canada. However, the government is not treating everything purchased from an American supplier as automatically American-made. Production history and substantial transformation remain important. The rules also prevent manufacturers from counting the same American material twice simply because it appears within another qualifying component.
Not Every Canadian Metal Product Qualifies for the New Calculation
One of the most important limitations is the narrow scope of the October guidance. The special non-U.S.-content calculation applies to certain machinery and equipment covered by Annex I-C of Proclamation 11032, provided the goods originate in Canada or Mexico and qualify for preferential treatment under CUSMA. This category includes specified mobile industrial equipment such as bulldozers, forklifts, graders, scrapers, mobile cranes, and non-agricultural tractors, along with certain related components. Eligibility depends on the precise customs classification rather than a broad description of the machinery.
That means a Canadian company exporting raw steel coils, aluminum ingots, or copper products cannot assume the new rule automatically reduces its tariff bill. Those shipments remain subject to the applicable Section 232 requirements for their individual tariff classifications. The October notice clarifies how American content is valued within a previously established category; it does not create universal relief for all metal exports. Businesses therefore need to determine whether their product falls within the relevant tariff provisions before calculating any potential savings. For companies selling several kinds of machinery, different products may receive substantially different treatment despite being manufactured at the same facility.
A 25% Tariff Still Comes With a 15% Minimum
For eligible CUSMA-qualifying Canadian and Mexican goods covered by Annex I-C, the June proclamation provides a 25% duty calculated on the product’s non-U.S. content. However, the total effective tariff cannot fall below 15% of the imported product’s full customs value. This prevents businesses from eliminating most of the duty simply by demonstrating that a large proportion of the equipment contains American materials. The minimum applies even when the normal non-U.S.-content calculation would produce a smaller amount.
Consider an illustrative machine with a customs value of US$100,000. If US$30,000 qualifies as American content, a 25% duty on the remaining US$70,000 would equal US$17,500. If American content instead represented US$60,000, the initial calculation would produce US$10,000, but the minimum would raise the duty to US$15,000. U.S. customs guidance accordingly limits the portion of American content reported at a zero Section 232 duty rate under this treatment to 40% of the entered value. These examples demonstrate the formula rather than a quotation for any particular shipment, which may face other applicable charges.
The Separate 85% American-Metal Rule Could Affect Sourcing
Another important feature of Washington’s revised tariff system concerns products manufactured abroad using American-origin metals. Proclamation 11032 reduced the threshold for qualifying metal content from 95% to 85% by weight. For covered derivative products, this can provide access to a reduced 10% tariff treatment when the relevant steel, aluminum, or copper meets the specified American-production requirements. Steel generally must have been melted and poured in the United States, while aluminum and copper must meet their respective smelting and casting requirements.
The 85% rule should not be confused with the American-content calculation clarified on October 9. One measures the origin of the applicable metal by weight; the other measures qualifying American content by value within a particular equipment category. Their different purposes are important for manufacturers considering procurement changes. A business might use American steel to manufacture a component in Canada, but its tariff treatment would still depend on product classification and the specific provision being claimed. The policy could encourage greater sourcing from American metal producers, although Canadian manufacturers must compare potential tariff savings with material prices, transportation expenses, and supply reliability.
Canada’s Core Steel and Aluminum Exports Still Face Heavy Tariffs
Despite the newly clarified preferential calculation, the broader American tariff framework remains restrictive. Under the revised Section 232 system introduced in April 2026, many core steel and aluminum articles, along with certain copper products, generally face additional duties of 50% of their full customs value. Other covered derivatives commonly face 25%, while specific machinery and equipment categories may qualify for reduced treatment. These categories are determined by official tariff schedules and detailed product classifications, rather than by a single rate applying to everything containing metal.
An especially consequential change introduced in April was the shift to assessing covered tariffs on the entire customs value of many products instead of only their metal content. For an eligible derivative that contains components made from several materials, this can produce a much larger tariff bill than a duty applied solely to its steel or aluminum portion. Some low-metal-content products fall outside these additional duties, but the exemption has classification restrictions and generally does not cover core metal chapters. Consequently, the October guidance does not reverse the financial pressure facing Canadian primary metal exporters, whose products may remain subject to substantially higher rates than qualifying industrial machinery.
Canada’s Metal Exporters Have Billions of Dollars at Stake
Canada’s exposure to American metal tariffs is substantial. According to Natural Resources Canada, the United States purchased approximately C$14.4 billion in Canadian iron and steel products, C$13.8 billion in aluminum, and C$5.6 billion in copper during 2025. These figures describe broad export categories and should not be interpreted as the precise value of shipments subject to a particular tariff. Nevertheless, they illustrate the enormous commercial relationship connecting Canadian producers with American manufacturers, construction companies, and industrial customers.
The pressure is especially significant because metal production supports businesses far beyond smelters and steel mills. A Canadian aluminum producer may supply a U.S. manufacturer making vehicle components, while a steel processor may serve customers producing industrial machinery or construction equipment. Transportation companies, maintenance contractors, and local service businesses also depend on those transactions. Natural Resources Canada reported that Canada’s total mineral exports to the United States declined approximately 9% in 2025. Tariffs coincided with that decline, although changing prices, demand, and other commercial factors also influenced export values. The figures reinforce why Canadian industry leaders continue seeking more predictable cross-border trading conditions.
Agricultural Equipment and HVAC Products Have Different Temporary Relief
Washington’s June proclamation also introduced targeted relief for certain agricultural machinery and residential heating, ventilation, and air-conditioning equipment. Qualifying products such as combines, harvesters, agricultural tractors, plows, and certain residential HVAC components generally received a temporary reduction in applicable Section 232 duties from 25% to 15%. These provisions were introduced before the October 9 guidance and operate through different tariff categories from the special non-U.S.-content calculation for mobile industrial equipment.
For farmers and manufacturers, the distinction can matter when comparing equipment prices. Agricultural operations depend on expensive machinery, and substantial import costs can influence purchasing decisions, replacement schedules, and investment in newer technology. A Canadian factory building qualifying agricultural equipment may therefore face different tariff treatment from another factory producing construction machinery, even when both rely heavily on steel. The reduced rates are scheduled to remain available through December 31, 2027, under the existing proclamation. They should not be interpreted as permanent tariff exemptions. Manufacturers must evaluate the relevant product classifications, as well as any applicable origin and content requirements, before assuming that a reduced rate applies.
CUSMA Eligibility Remains Essential but Does Not Guarantee Duty-Free Access
Canada’s trade agreement with the United States and Mexico plays a central role in determining who can benefit from the special machinery tariff calculation. Under Proclamation 11032, the non-U.S.-content treatment is available to qualifying products from Canada and Mexico that satisfy CUSMA preferential requirements. However, compliance with the trade agreement does not automatically eliminate Section 232 duties. A qualifying industrial machine may still face the 15% minimum, while a core metal product can remain subject to a substantially higher tariff.
Demonstrating CUSMA origin is therefore only part of the process. U.S. Customs and Border Protection requires a certification of origin containing nine minimum data elements, although the information does not have to appear on a prescribed government form. Businesses claiming the special content treatment must also establish the American value included in their products. These are separate questions: whether the finished good qualifies under CUSMA and how much American content can be recognized for the applicable tariff calculation. Confusing the two could lead manufacturers to overestimate potential savings. Accurate classification, origin information, and customs valuation remain essential for lawful preferential treatment.
Customs Documentation and Incorrect Claims Carry Financial Risks
The updated guidance also places additional practical importance on supply-chain records. Importers seeking preferential tariff treatment may need reliable information about where individual parts were produced, where steel was melted and poured, and where aluminum or copper was smelted and cast. U.S. customs instructions issued in June already required eligible importers claiming the special treatment to distinguish the dutiable portion of a covered product from its permitted American-content portion when reporting entries.
The October notice clarifies what may count as American content but does not establish a universal new certification form or require all Canadian exporters to file documents by October 14. Nevertheless, businesses claiming relief need evidence that can support their customs declarations. A manufacturer purchasing metal through several intermediaries might need information from its original supplier rather than relying solely on the invoice from its distributor. The June proclamation explicitly warns that U.S. Customs and Border Protection may impose penalties when importers commit fraud or deliberately misrepresent American content. For companies handling repeated cross-border shipments, a mistake in the origin or value calculation could create financial exposure extending beyond a single transaction.
Ottawa’s Counter-Tariffs Add Another Complication
Canada has maintained its own trade countermeasures while negotiations with Washington remain unsettled. On September 8, 2026, Ottawa implemented additional tariffs on approximately C$27.6 billion worth of targeted American imports, responding to new U.S. trade restrictions introduced in August. The measures include rates of 15%, 25%, and 50%, depending on the product. Certain American steel and aluminum products that had previously faced Canadian duties of 25% became subject to higher rates of 50%.
The result is a complicated environment for companies operating on both sides of the border. A Canadian manufacturer may face American tariffs when selling finished products into the United States while also encountering higher costs for particular American inputs imported into Canada. Not every product is subject to both sets of measures, and the rules governing how different tariffs interact are important. Canada’s tariff system also includes targeted relief arrangements and restrictions on applying multiple Canadian metal surtaxes to the same goods. Ottawa maintains that its countermeasures are intended to defend Canadian industries against American trade actions. However, prolonged reciprocal tariffs can complicate pricing and investment decisions for businesses that rely on integrated North American manufacturing.
The Next Major Test Comes With CUSMA Negotiations and 2028 Tariff Changes
The October clarification arrives during an uncertain period for the future of North American trade. On July 1, 2026, the United States declined to extend CUSMA during the agreement’s first scheduled joint review. Although the decision prevented an immediate extension of the agreement’s term, CUSMA remains in force. Washington has already begun preparing for the 2027 review, with the U.S. Trade Representative requesting public comments by January 12, 2027. Steel, aluminum, and other industrial trade disputes remain significant issues within the broader relationship.
Manufacturers must also consider the scheduled expiration of temporary reductions established by the June metal-tariff proclamation. Several preferential categories are set to change after December 31, 2027, with different tariff treatment scheduled to begin on January 1, 2028, unless Washington modifies the rules beforehand. This creates challenges for companies negotiating multiyear equipment contracts or planning investments in manufacturing facilities. The October 14 guidance gives qualifying importers greater clarity about American-content calculations, but it does not settle the broader tariff dispute. For Canada’s metal producers and manufacturers, lasting stability will depend on both reliable customs rules and a more predictable trade relationship with the United States.
