On Oct. 14, an argument over what counts as a North American car returns to a Washington hearing room. The U.S. International Trade Commission will examine the USMCA’s automotive rules of origin, a technical-sounding set of requirements that now sits at the centre of a much larger fight over tariffs, manufacturing and the future of continental trade.
Canadian-built vehicles are only one part of the proceeding, which also covers U.S. and Mexican production. But Canada has unusually high exposure: more than 90% of Canadian-made vehicles are exported to the United States. The hearing will not itself impose a new tariff or rewrite USMCA. Instead, it will build the factual record for a 2027 report—evidence that could carry unusual weight as Washington, Ottawa and Mexico City argue over what the next version of North American auto trade should look like.
The Oct. 14 Hearing Is About Evidence, Not a New Tariff
The Oct. 14 proceeding is formally a U.S. International Trade Commission fact-finding hearing, scheduled for 9:30 a.m. at the agency’s Washington headquarters. It is part of Investigation No. 332-608, the third of five congressionally required reviews of how USMCA automotive rules of origin are operating and what they are doing to the American economy.
That distinction matters. The commission says its general fact-finding reports provide objective analysis and do not make policy recommendations. No commissioner will emerge from the hearing with authority to raise a tariff on an Ontario-built SUV. But the record will examine production, investment, wages, trade, consumer interests and competitiveness, and the final report goes to the president and key congressional committees by July 1, 2027. In a trade dispute increasingly fought with data as well as tariffs, that makes the hearing consequential even without a binding vote. That is where its real political leverage now lies.
The Rulebook Behind a “Canadian-Made” Car Is Complicated
The argument begins with a deceptively simple question: how much of a vehicle must really come from North America before it earns preferential treatment? Under USMCA, passenger vehicles, light trucks and core parts generally face a 75% regional-value-content requirement, up from 62.5% for key light vehicles under NAFTA. Automakers also face North American steel-and-aluminum sourcing rules and labour-value requirements tied to production at qualifying higher-wage facilities.
Those calculations make a “Canadian-made” vehicle more complicated than the location of its final assembly line. A car assembled in Ontario may contain engines, electronics, steel, seats or other components that crossed the U.S.-Canada border during assembly. Industry groups say components can move across borders multiple times before final assembly. That is why a small change in how content is counted can alter whether it qualifies, how much paperwork a producer carries and, under today’s tariff structure, how much duty may be owed.
Washington’s Last Review Found Both Winners and Higher Costs
Washington has evidence that tighter origin rules produce mixed results. In its 2025 review, the USITC found the rules were associated with higher employment, production, revenue, capital spending and profits for U.S. parts and materials producers, while producing slight declines in several of those measures for U.S. light-vehicle manufacturers. The commission also found that sourcing changes made to satisfy the rules increased production costs.
The trade pattern was not one-directional either. The USITC’s modelling found lower U.S. light-vehicle imports from Canada and Mexico alongside higher light-vehicle imports from countries outside USMCA, while average light-vehicle prices rose slightly. Investment surged from $27.9 billion in 2019 to $87.8 billion in 2023 before falling to $34.1 billion in 2024, although the commission cautioned that the rules explained only part of that movement. Those findings complicate any claim that tougher rules bring more production home. The new hearing will test whether that balance has shifted.
Tariffs Have Made the Origin Calculation Much More Valuable
The stakes changed sharply when the United States layered tariffs onto the origin rules. A March 2025 presidential proclamation imposed a 25% tariff on imported automobiles. For vehicles that qualify for USMCA preferences, importers can document U.S. content and have the 25% duty applied only to the vehicle’s non-U.S. value, rather than automatically to the full sticker-value calculation.
That makes origin accounting far more valuable than it was when the main alternative was often a relatively low normal tariff. Federal Reserve researchers used the shift from NAFTA to USMCA automotive rules as a case study and estimated added compliance costs equivalent to 1.4% to 2.5% of import value. The lesson is not that paperwork costs are bigger than the tariff. It is that tracing components, certifying origin and mapping complicated supplier networks now carry real economic consequences. For Canadian plants, the argument over percentages can translate directly into vehicle-level costs.
Canada and the U.S. Are Already Trading Auto Blows
The Oct. 14 hearing arrives after the auto dispute has already spilled well beyond technical customs rules. Canada has imposed 25% counter-tariffs on non-USMCA-compliant U.S. vehicles and on the non-Canadian, non-Mexican content of qualifying U.S. vehicles since April 2025. Ottawa also built a remission framework intended to reward automakers that keep production and investment in Canada.
Washington escalated in 2026. In July, President Donald Trump invoked Section 338 and declared Canada’s motor-vehicle tariff system discriminatory, ordering an additional 50% duty on certain Canadian products as retaliation. That action did not turn the USITC hearing into a tariff case—the two processes are legally separate—but it changed the atmosphere around it. Rules that once looked like technical guardrails inside a free-trade agreement are now being debated while both governments use tariffs and industrial policy to influence where vehicles are built, where parts are sourced and which factories receive future investment.
A Previous Rules-of-Origin Fight Still Hangs Over Washington
This is not Washington’s first fight with Canada over the meaning of the auto rules. Canada and Mexico challenged the U.S. interpretation of how “core parts” should be counted toward a vehicle’s regional value content. Their position allowed a qualifying core part to be treated as originating when calculating the vehicle’s content; Washington took a stricter view that preserved additional tracing of non-originating material.
A USMCA dispute panel ruled in favour of Canada and Mexico, with the final report issued in December 2022 and made public in January 2023. Canadian officials later said resolution discussions were still ongoing. That history matters because it shows the coming debate is not starting from a blank page. Automakers have already made sourcing and compliance decisions around contested interpretations, while governments have spent years arguing over what negotiators intended. Any push to tighten or rewrite the rules will collide with an existing legal and operational record.
Ontario Has Far More at Stake Than a Customs Calculation
For Canada, the argument is difficult to separate from Ontario’s industrial map. The federal government says Canada produced more than 1.2 million passenger vehicles in 2025, with more than 90% of Canadian-made vehicles and 60% of Canadian-made auto parts exported to the United States. The sector supports 125,000 direct jobs nationally, making access to the U.S. market central rather than optional.
Ontario carries much of that exposure. Federal data say the province’s auto-manufacturing sector employs more than 95,000 people and exported about C$60 billion in autos and parts to the United States in 2025—96% of Ontario’s automotive exports. The vulnerability extends beyond large assembly plants. More than 95% of smaller automotive suppliers have fewer than 500 employees, yet they account for 61% of the sector’s workforce. A content-rule change can reach machine shops and component plants far from any headline-making assembly line. That is why the stakes spread quickly.
Electric Vehicles Are Making the Old Rulebook Harder to Use
Electric vehicles are making the origin debate harder because the parts that create value are changing. The USITC’s 2025 work highlighted areas such as electric pickups, e-axles, new battery chemistries and aluminum-intensive vehicle bodies, where technology can create new questions about tariff classification and the treatment of components. The 2027 investigation is required to ask whether existing rules remain relevant as technology changes.
That matters because a rulebook designed around engines, transmissions and conventional supply chains can become awkward when batteries, power electronics, software-linked hardware and new materials account for more of a vehicle’s cost. Unifor has argued that the list of core automotive components should be updated to better reflect future vehicles, while USTR’s reviews have acknowledged industry requests for flexibility as EV and battery production develops. The next rules fight may be about more than raising a percentage; it may be about redefining which components matter most.
Automakers and Labour Want Different Kinds of Certainty
Automotive trade groups in the U.S. have urged Washington to preserve USMCA’s trilateral structure, arguing that a unified rulebook reflects a production system in which vehicles and components cross borders multiple times. For manufacturers, predictability matters because sourcing contracts, tooling and new assembly programs are planned before the first vehicle reaches a dealer.
Labour organizations have pushed from a different direction. Unifor has argued for stronger local-content incentives, tighter treatment of components and improvements to the labour-value-content rules, saying the structure has not delivered the intended level of North American production. Those positions can overlap—both sides want competitive regional industry—but they differ on how much flexibility automakers should receive. The Oct. 14 record could expose a tension: rules strict enough to force local investment may also become expensive enough that companies seek workarounds, pay tariffs or source differently.
The Fight Will Continue Long After Oct. 14
The hearing is only one checkpoint. U.S. motor-vehicle producers identified by the USITC face an Oct. 16 deadline for the commission’s mandatory questionnaire. Post-hearing briefs are due Oct. 21, and other written submissions are due Nov. 2. The commission then has months to analyze confidential company data and public testimony before its report is delivered by July 1, 2027.
Meanwhile, the larger USMCA process is moving. At the July 1, 2026 joint review, the United States declined to renew the agreement in its current form, although USMCA remains in force. A federal notice published Oct. 5 has opened consultation for the 2027 annual joint review, with comments due Jan. 12. The practical result is a two-track fight: technical evidence on how the auto rules actually work, and political negotiations over how they should change. Canadian-made cars sit at the intersection of both. The hearing will help shape that evidence base.
