Stellantis tells its workers that trade policy has destroyed the business case for a 269-acre Ontario assembly plant, Unifor declares an impasse as the contract expires, and Ottawa discovers the limits of a tariff strategy that cannot keep a factory open.
BRAMPTON, Ont., Sept. 20, 2026
The collective agreement covering more than 9,000 Stellantis workers in Canada expired at 11:59 p.m. Sunday with no settlement, no scheduled return to bargaining and an employer that has told its own employees, in writing, that it cannot find a business case for the assembly plant at the centre of the dispute.
The Brampton Assembly Plant is the most consequential single casualty so far of the Canada-United States tariff conflict, and the week just ended turned it from a labour dispute into a national trade policy problem. Unifor declared an impasse on Thursday. Stellantis sent employees a letter the same day stating that no option examined “provided a sustainable long-term business case that would support continued operations at the facility.” Industry Minister Mélanie Joly intervened publicly on Friday. On Saturday, Brampton’s mayor warned that the Detroit Three’s position in the Canadian market is at risk of collapse, and confirmed that Chinese and European vehicle makers have been circling the site.
The plant has been idle since December 2023. It covers 2.95 million square feet on 269 acres. About 3,000 workers have been displaced. Its retooling for a next-generation vehicle program was paused, then shelved, and in August the company notified the union it was considering closure or sale.
“Stellantis is looking for an exit, and no one, no one, should be holding the door open,” Unifor national president Lana Payne told a news conference at the Sheraton Centre in downtown Toronto on Thursday.
The company’s case, in its own words
Stellantis has been more explicit than manufacturers usually are about the causal chain.
“Market and trade conditions have directly impacted the original business case for Brampton,” the company told employees, adding that “the automotive industry continues to face unpredictable trade policies, challenging regulatory requirements and affordability pressures.”
The specifics behind that sentence are not mysterious. Since April 2025, the United States has applied a 25 per cent Section 232 tariff on imported automobiles, with a corresponding 25 per cent tariff on auto parts from May 2025, from which parts qualifying under the Canada-United States-Mexico Agreement were exempted. Vehicles assembled in Canada and sold in the United States face the duty on their non-American content. Canada responded in April 2025 with 25 per cent retaliatory tariffs on American vehicles that do not qualify under the agreement, and on the American content of those that do.
More consequentially for a plant siting decision, an American proclamation issued in April 2025 created an import adjustment offset available only to manufacturers whose vehicles undergo final assembly in the United States, worth 15 per cent of vehicle value in the first year and 10 per cent in the second. That is not a tariff. It is a subsidy for relocating final assembly south of the border, and it does precisely what it was designed to do when a company is deciding where to place a new program.
Layer onto that the outcome of the CUSMA joint review on July 1, 2026, at which the United States declined to extend the agreement for a further sixteen-year term. The agreement remains in force until 2036, but the parties must now conduct annual joint reviews for the remainder of its term unless they subsequently agree to extend. For an automaker weighing a seven-to-ten-year product cycle against a treaty with an annually renewed political horizon, the calculus is straightforward and unfavourable to Canada.
Then came September. Proclamations effective Sept. 15 modified the scope of the 50 per cent Section 338 duties on Canadian goods and reversed the previous policy that those duties would not stack with Section 232 measures. Iron and steel structural products and aluminum profiles, bars, rods, tubes and pipes now face combined additional duties of up to 75 per cent. A separate proclamation bans certain Canadian motorcycles from entry entirely as of Sept. 29.
None of that targets a Brampton-built passenger car directly. All of it prices the inputs, the tooling and the uncertainty.
Unifor’s position and the bargaining table
Payne was careful on Thursday to separate two things Stellantis has been treating as one: the collective agreement, and the fate of the plant.
“Selling that plant in the middle of a trade war, and in the middle of collective bargaining, is indefensible,” she said. The union’s demand, in her formulation, is “don’t close, don’t sell. Protect the integrity of the plant as a bridge to future vehicle production.”
On the bargaining itself: “We are at an impasse. Therefore strike action remains a real possibility.” She immediately qualified it: “It remains Unifor’s objective to reach a tentative settlement with Stellantis without the need to take strike action,” and stated that Sunday’s expiry was not a strike deadline.
That distinction matters commercially. Unifor’s agreement covers more than 9,000 Stellantis employees in Canada, the great majority of them at the Windsor Assembly Plant and the Etobicoke casting operation, not at idled Brampton. A strike would halt production of vehicles that are currently being built and sold. The union is holding a lever over active operations to protect an inactive one, which is a defensible tactic and also a risky one in a year when the company is openly reassessing its Canadian footprint.
The immediate exposure is the roughly 2,000 direct workers with recall rights at Brampton plus hundreds of supplier firms in the Greater Toronto Area whose tooling and contracts were written against that program. Automotive supply is a sequential business; a tier-one supplier that loses an assembly customer typically cannot replace it within the same footprint.
Unifor wrote to Joly on Sept. 16 asking for federal intervention. The union had declared an initial impasse and disclosed a memorandum of understanding between Stellantis and the Canadian armoured vehicle manufacturer Roshel on Sept. 11 and 12.
Ottawa’s response
Joly responded publicly on Friday.
“They need to get back to the negotiation table, and they can find a really trustworthy partner in myself and the government to make sure that they get to a deal,” the industry minister said. On the prospect of a sale, she added: “When it comes to any potential sale of the plant to any other company, we will make sure that we protect Canadian workers.”
The intervention came a day after Prime Minister Mark Carney told Liberal members of Parliament at a caucus retreat that Ottawa was adding C$7.5 billion to its tariff response, on top of C$25 billion already committed, with money directed to “targeted help for sectors that are hit hardest, autos, forestry, steel, aluminum.”
The Brampton situation illustrates the awkward limits of that approach. Federal money can support workers through unemployment, fund retraining, and provide liquidity to suppliers. It cannot manufacture a business case for a product program when the tariff structure on the other side of the border pays a manufacturer to assemble the vehicle somewhere else. Ottawa has considerable capacity to cushion the consequences of the American measures and very little capacity to reverse the investment decisions those measures induce.
There is precedent for a more interventionist tool. Canada’s performance-based remission framework for automakers, established in April 2025, conditioned relief from Canadian retaliatory tariffs on maintaining Canadian production and employment. Whether Ottawa is prepared to apply similar conditionality to the new sector envelopes, and whether it has the leverage to do so against a manufacturer that is already contemplating exit, is the practical question facing the industry department this autumn.
The mayor’s warning and the buyers at the door
Brampton Mayor Patrick Brown put the strategic question in terms neither the company nor the union has been willing to use publicly.
“Don’t kid yourself, the dominance that the Big Three have had in the Canadian auto market will evaporate,” Brown said Saturday, describing two schools of thought within Canada. One holds that the country should pivot now toward a market in which foreign automakers, including Chinese manufacturers, take a far larger share. The other holds that Canada should hold the line for roughly two years, until the end of the current American presidential term, and preserve the existing footprint in the interim.
He confirmed that several parties have expressed interest in the Brampton site. Roshel is the leading suitor and has signed a memorandum of understanding with Stellantis. BYD, the Chinese vehicle maker, approached roughly six months ago in connection with transit buses. Leapmotor International, an unnamed Italian automaker and the drone manufacturer Dominion Dynamics have also inquired.
The prospect of a Chinese automaker acquiring a former Stellantis assembly plant in Ontario would be a significant development in its own right. Canada imposed a 100 per cent surtax on Chinese electric vehicles in 2024, and China responded with duties on Canadian canola, seafood and pork that remain a live irritant. A Chinese acquisition would collide with that policy, with American content and origin rules under CUSMA, and with the security review provisions of the Investment Canada Act.
Flavio Volpe, president of the Automotive Parts Manufacturers’ Association, has been publicly cool on the leading bid, saying of the armoured vehicle maker’s plan: “we don’t need Roshel in Brampton at that plant.” The parts sector’s concern is straightforward. A defence vehicle manufacturer using the site would preserve the building and some employment but would not generate the volume that sustains a passenger vehicle supply base. Tooling, sequencing and logistics built around a high-volume assembly line do not transfer to low-volume armoured production.
What it means for the wider Canadian auto trade
Canadian vehicle and parts exports to the United States are among the largest single components of the bilateral goods relationship, and the sector is the most deeply integrated in either economy. Parts cross the border multiple times before final assembly. That integration was the premise of three successive North American trade agreements, and it is now the vulnerability the American measures exploit.
Three structural consequences are becoming visible.
The first is a slow reallocation of final assembly. The import adjustment offset, the Section 232 vehicle tariff and the shortened effective horizon of CUSMA together create a consistent incentive to place new programs in the United States. That incentive operates on a product-cycle timetable, which means the damage is largely invisible until a specific plant, like Brampton, reaches a retooling decision point and the answer is no.
The second is supply base attrition. Canadian tier-one and tier-two suppliers are being squeezed from both directions: American tariffs on their shipments south, and Canadian counter-tariffs on the American steel, aluminum and components they buy. The Canadian Federation of Independent Business has counted more than 45,000 small importers exposed to Canada’s own counter-tariff schedule, against roughly 13,000 exporters exposed to the American measures, and has argued publicly that the counter-tariffs reach further into the domestic small business base than the American ones do. In automotive supply, where margins are thin and contracts are fixed-price, that squeeze is existential for smaller firms.
The third is a financing problem. Statistics Canada reported on Sept. 17 that Canadian investors sold an unprecedented C$31.0 billion of American shares in July while foreign purchases of Canadian federal bonds ran to C$104.0 billion year to date, against C$13.8 billion in the same period of 2025. Capital is repositioning. For an auto supplier seeking to finance a retooling against uncertain volumes, the relevant point is that lenders are pricing Canadian automotive assets with a trade risk premium that did not exist two years ago.
The macroeconomic frame, and why it understates the damage
The Bank of Canada’s published assessment of the tariff conflict is notably calmer than the mood in Brampton. In the summary of Governing Council deliberations released Sept. 16, covering the Sept. 2 decision to hold the policy rate at 2.25 per cent, members observed that the newest American tariffs had been imposed on roughly 5 per cent of Canadian goods exports to the United States. They acknowledged “the significant impact these tariffs would have on the affected businesses and workers” while judging that “the direct impact on the Canadian economy as a whole, however, would likely be modest.”
That framing is defensible as macroeconomics and misleading as industrial policy. A measure that affects 5 per cent of exports but falls on the single most integrated and most capital-intensive manufacturing sector in the country does not distribute its damage in proportion to its share of gross domestic product. Automotive assembly anchors a supplier network, a skilled trades workforce, a set of engineering capabilities and a municipal tax base that took sixty years to build and that does not reconstitute itself if it is allowed to disperse.
The council was similarly measured about Canada’s own counter-tariffs, noting that because most applied to intermediate inputs such as steel and to goods with Canadian substitutes, “the impact on inflation would likely be muted and spread out over time.” Muted inflation is not the same as muted harm. For a Canadian stamping plant buying American tool steel under a 25 per cent surtax, the cost does not show up in the consumer price index. It shows up in a lost quote.
Producer price data released Sept. 17 gives a sense of the input environment those firms are operating in. The Industrial Product Price Index rose 13.5 per cent year over year in August, a twenty-third consecutive annual increase, while the Raw Materials Price Index climbed 22.8 per cent. Unwrought aluminum was up 27.6 per cent over twelve months and unwrought copper up 49.3 per cent. Statistics Canada cautions that the index does not measure the direct effect of tariffs, but that tariffs may influence the prices it captures indirectly.
For automotive suppliers, those are not abstract numbers. Aluminum and steel are the two largest input categories in body, chassis and powertrain components, and a Dallas metal fabricator quoted by Global News this week described aluminum costs up 84 per cent since March 2025 and 40 per cent in 2026 alone. The same pressure operates on both sides of the border, which is part of why American manufacturers have been unenthusiastic about the policy without being politically mobilised against it.
Laura Dawson of the Future Borders Coalition framed the structural asymmetry in remarks reported this week: “The size of the Canadian economy is just not large enough to engage in a full-blown trade war with the United States for very long. And it’s small business that gets hit first.”
In the automotive supply base, small business is most of the business. The assembly plants attract the attention and employ a minority of the sector’s workers. The tier-two and tier-three shops that machine, stamp, mould and finish components employ the majority, operate on single-digit margins, and have neither the balance sheet to absorb a 75 per cent input duty nor the political visibility to attract a rescue package.
What businesses should do
For firms in the Canadian automotive supply chain, several actions are time-sensitive.
Reassess landed cost for stacked duties. The Sept. 15 reversal of the non-stacking rule means goods subject to both Section 232 and Section 338 now face combined additional duties reaching 75 per cent on certain aluminum and steel structural products. Cost models built on the prior rule are wrong, and contracts priced against them will be loss-making.
Do not rely on CUSMA qualification for Section 338 exposure. The September proclamations make no provision for preferential treatment, and the implementing statute provides that no provision of the agreement inconsistent with American law has effect. Origin qualification remains essential for Section 232 purposes and worthless for Section 338 purposes. The two regimes must be modelled separately.
Confirm importer of record standing. Customs and Border Protection enforcement effective Sept. 18 permits immediate voiding of an importer of record number where Form 5106 data is inaccurate or incomplete, and requires a genuine physical business address rather than a broker, forwarder, registered agent or post office box. Canadian suppliers acting as importer of record to absorb duties on behalf of American customers are directly exposed.
Review remission eligibility on Canadian counter-tariffs. Relief for steel and aluminum used in the manufacture of automobiles, auto parts and aerospace goods has been the subject of repeated federal extensions, and eligibility depends on documented end use. No new remission order was issued in the week to Sept. 20, and Customs Notice 26-23 implementing the current surtax order remains unamended. Firms should file on the existing framework rather than wait.
Stress-test customer concentration. Suppliers with material exposure to a single assembly program in Canada should model the scenario in which that program does not return. Brampton has now demonstrated that an idled plant can stay idled for nearly three years and then be sold to a buyer from an entirely different industry.
Watch the parliamentary session. The House of Commons resumes Monday. Program detail for the C$7.5 billion package, any conditionality attached to it, and any move toward a CUSMA or World Trade Organization filing will all surface there. Bank of Canada Governor Tiff Macklem speaks in Halifax the same day, in his first address since the September escalation.
The unresolved question
Stellantis has said it cannot make the numbers work at Brampton under current trade conditions. That statement is almost certainly true, and it is also a negotiating position. Unifor has said the plant must not be sold during a trade war. That position is defensible and may not be enforceable. Ottawa has offered to help both sides reach a deal, without a mechanism to change the underlying economics.
What none of the three has articulated is what a Canadian assembly plant is for, in a North American market where the largest customer pays manufacturers to assemble elsewhere and has declined to guarantee the trade agreement past an annual review. Until that question has an answer, every retooling decision in the Canadian industry will run the way Brampton’s did.