The Receipt
On March 4, 2025, the United States imposed 25% tariffs on most Canadian goods and 10% on energy under the International Emergency Economic Powers Act [1]. Canada responded with 25% tariffs on C$30 billion of U.S. goods, with a further C$125 billion proposed under a phased expansion [2]. Within three days, the U.S. exempted CUSMA-compliant goods [3], and that exemption became the framework Canadian exporters relied on. Most bilateral trade returned to preferential access.
Eighteen months later, that framework has been breached. The auto sector faces 25% tariffs that did not exist on Day One and has documented a 6% decline in employment, a 5.4% drop in production, and plant closures across Ontario [4] [5]. Hundreds of additional product categories face 50% tariffs under Section 338, an authority invoked for the first documented time in its 96-year history [6]. Those tariffs took effect on August 22 and apply even to CUSMA-compliant goods [7]. They carry no time limit and can be expanded by presidential proclamation without investigation or hearing.
The federal government estimates Canada’s average U.S. tariff rate at 5.2%, the lowest among major American trading partners [8]. That figure is accurate. It is also dominated by the energy sector, which was carved out of every escalation. For the auto workers in Oshawa, the plywood producers in British Columbia, the dairy farmers in Quebec, and the furniture manufacturers in Ontario, the documented tariff rate is 25% to 50%.
Canada has made documented concessions over 18 months, including dropping most of its retaliatory tariffs [9]. No durable U.S. tariff reduction has been secured in any targeted sector. No bilateral agreement has been signed. Talks are suspended as of August 22, with no further rounds scheduled [10].
This piece compares measurable components of Canada’s trade position as they stood on March 4, 2025 to their documented state on August 24, 2026. It does not judge the government’s motives or whether an alternative strategy would have produced a better result.
The starting position: a broad 25%/10% tariff wall under IEEPA. Within three days, the administration exempted CUSMA-compliant goods and most Canadian exports returned to preferential access. Canada deployed retaliatory tariffs on C$30 billion of U.S. goods immediately, with a further C$29.8 billion on March 13 in response to steel and aluminum tariffs [2] [11]. CUSMA was stable, with its six-year review 16 months away. The budget deficit stood at $36.3 billion [12]. That was the baseline. What follows is what changed.
| March 2025 | August 2026 | |
|---|---|---|
| Auto tariff | 0% (CUSMA-compliant) | 25% on non-U.S. content [13] |
| Section 338 | Did not exist | 50% on ~US$20B of goods [6] |
| CUSMA exemption | Functioning for compliant goods | Breached for Section 338 categories [7] |
| CUSMA status | In force, extension assumed | In force, U.S. declined to extend [14] |
| Canadian retaliation | C$30B active (Mar. 4); C$29.8B added Mar. 13 | Most dropped Sept. 2025; retained on steel, aluminum, autos [9] |
| Auto employment | Baseline | Down ~6% [4] |
| Business investment | Weak | Declined 5 consecutive quarters [12] |
| Federal deficit | $36.3B | $72.0B [12] |
| Bilateral agreement | None (tariffs just imposed) | None |
| Talks | Channel open | Suspended [10] |
The Sectors That Did Not Face Tariffs on Day One
On March 7, 2025, the U.S. exempted CUSMA-compliant goods from the IEEPA tariffs [3]. For most Canadian exporters, the trade war was a three-day shock followed by a return to preferential access. The tariff regime that exists in August 2026 looks nothing like that. New authorities have been created, and the sectors they target now face rates that did not apply to them 18 months ago.
Automobiles
On April 3, 2025, the U.S. imposed a 25% tariff on non-U.S. content in imported vehicles [13]. This tariff category did not exist on March 4. Over 90% of Canadian-made vehicles and 60% of Canadian-made auto parts are exported to the United States. The sector supports 125,000 direct jobs [15].
The documented damage since the tariff took effect: employment in motor vehicle and parts manufacturing declined nearly 6% from January 2025 to March 2026 [4]. Production declined 5.4% year-over-year in 2025 [5]. Two-way trade in motor vehicles and parts fell 18.9% between Q1 2024 and Q1 2026, a $6.7 billion decline that made autos the largest sectoral contributor to falling bilateral commerce [16].
At the plant level: General Motors reduced its Oshawa Assembly Plant from three shifts to two, eliminating roughly 500 jobs. Stellantis shifted planned Jeep production to the U.S. from its Brampton, Ontario plant, which remains idle with 2,200 workers on layoff. Unifor says Stellantis is in talks to sell the facility. GM closed its electric-van plant in Ingersoll. Ford idled its Oakville factory in 2024 and is slowly ramping up production of a different vehicle line [17].
Ontario’s Financial Accountability Office projected up to 68,100 job losses in 2025, rising to 119,200 in 2026 and 137,900 by 2029 if tariffs remain in place, with Windsor, Guelph, Brantford, and the Waterloo Region among the hardest-hit communities [20].
Section 338 Products
On July 20, 2026, the President signed three proclamations under Section 338 of the Tariff Act of 1930, imposing an additional 50% tariff on specified Canadian goods [6]. It was the first documented use of Section 338 to impose tariffs since the statute became law [21]. The tariffs took effect at 12:01 a.m. on August 22 after three days of talks in Washington failed to produce a final agreement [10].
The three proclamations were labeled dairy, alcoholic beverages, and motor vehicles. The annexes cover far more. Thomson Reuters found the list includes plywood, cement, furniture, clothing, textiles, seeds, hockey sticks, fishing rods, swimming pools, chandeliers, and wigs [22]. The Kitchen Cabinet Manufacturers Association and the Decorative Hardwoods Association found that HTS heading 4412, covering plywood, veneered panels, and laminated wood, is included almost in its entirety [23]. The broadest annex reaches into Chapters 84 and 85 of the tariff schedule, covering machinery, electronics, servers, and networking hardware [24].
Combined, the three proclamations cover roughly US$20 billion (approximately C$28 billion) in Canadian imports, about 5% of the $382 billion in goods the U.S. imported from Canada in 2025 [6].
Economist Trevor Tombe’s analysis, published August 24, estimates that approximately 52,000 Canadian jobs are directly at risk from the Section 338 tariffs, with indirect effects on suppliers and service providers putting another 35,000 at risk. The hardest-hit provinces are Ontario (36,100), Quebec (18,300), and British Columbia [25].
Steel, Aluminum, and Manufacturing
Section 232 tariffs on steel and aluminum predated the trade war, but were tightened in April 2026 with a new tiered approach that added copper products [26]. These sectors, along with autos, machinery, and lumber, collectively accounted for more than 80% of the tariffs the U.S. collected from Canada over the course of 2025 [26].
In the broader manufacturing sector, employment fell by nearly 43,000 workers between March and May 2025. April alone saw 30,600 jobs lost [27]. Partial rebounds followed, but the pattern through the rest of the year was persistent instability rather than sustained recovery.
What the Average Hides
The federal government’s Spring Economic Update estimates Canada’s average U.S. tariff rate at 5.2%, describing it as the lowest among major American trading partners [8]. That is a documented government estimate. The strongest case built on it deserves full weight.
Although headline tariff rates have escalated in certain sectors, the effective burden on Canadian trade is far smaller than those rates suggest. CUSMA continues to protect the vast majority of bilateral commerce. Section 338 covers roughly 5% of exports. Energy, potash, and critical minerals are excluded from every escalation. The economy absorbed 18 months of trade war without a severe recession. Growth in 2025 was second-highest in the G7 [8]. The Bank of Canada says the economy is showing signs of improvement [28].
All of that is accurate. Here is what the 5.2% does not describe.
Energy accounted for roughly 29% of Canadian goods exports to the United States in 2025 and has been carved out of every tariff escalation [8]. When the single largest export category faces near-zero additional tariffs, it pulls the weighted average down regardless of what is happening everywhere else. For the auto worker in Oshawa, the effective rate is 25%. For the plywood producer, the furniture manufacturer, or the dairy farmer, it is 50%. Business investment decisions are made at the sectoral level, not the weighted-average level. Five consecutive quarters of declining business investment reflect the sectoral reality, not the average [12].
And the 5.2% is a snapshot. Section 338 allows the President to add product categories by proclamation at any time, with no investigation, no hearing, and no statutory time limit [21]. The authority’s current scope is a policy choice. Today it covers US$20 billion. There is no documented ceiling preventing it from covering more.
What Changed in the Architecture
Three structural shifts separate August 2026 from March 2025. Each changes the rules the negotiation operates under.
First, the CUSMA exemption was breached. The Section 338 tariffs apply to covered goods regardless of USMCA origin, stated expressly in the White House fact sheet [7]. Before July 20, 2026, CUSMA compliance was the protective assumption. Manufacturers structured supply chains, sourced materials, and invested in Canadian production on the expectation that meeting rules of origin guaranteed tariff-free access. That assumption no longer holds for covered categories, and no structural barrier prevents the covered list from expanding. One qualification: Section 232 auto tariffs already applied duties to non-U.S. content in USMCA-qualified vehicles. The more precise framing is that Section 338 is the first authority in this trade conflict to impose tariffs expressly covering CUSMA-originating goods without any content-based offset [6].
Second, CUSMA was not extended. The U.S. Trade Representative formally declined to extend the agreement at its July 1, 2026 review [14]. Canada and Mexico both confirmed extension. The agreement remains in force until 2036, with all preferential tariffs and dispute mechanisms intact. But the non-extension triggers annual reviews under Article 34.7.4, creating recurring points of uncertainty. The Bank of Canada identified CUSMA uncertainty as a leading risk to the economic outlook [28].
Third, the U.S. moved to bilateral negotiations. Mexico completed multiple bilateral negotiating rounds before Canada’s first formal talks began [14]. The coalition dynamics of a trilateral framework are structurally altered, though the full implications are beyond this article’s scope.
What Canada Gave and What It Got
Canada deployed retaliatory tariffs on C$30 billion of U.S. goods on March 4, 2025, with a further C$29.8 billion following on March 13 in response to steel and aluminum tariffs [2] [11]. The frequently cited C$155 billion figure reflected the total proposed scope including a second phase subject to public consultation, not the amount simultaneously active on Day One [2].
Canada dropped retaliatory tariffs on the majority of U.S. goods effective September 1, 2025, retaining them only on steel, aluminum, and automobiles [9]. On August 22, 2026, Prime Minister Carney disclosed that Canada had offered to remove its remaining retaliatory tariffs on steel, aluminum, and autos in exchange for substantial U.S. reductions. The offer was not accepted [10]. Canada also offered to encourage provinces to restore U.S. alcohol sales and to adjust dairy access terms.
There is another way to read the reduction in Canadian retaliation. Retaliation established Canada’s willingness to impose costs. Removing broad counter-tariffs later reduced domestic costs while Canada retained sector-specific countermeasures. On that reading, a smaller retaliatory list does not necessarily mean less leverage. The August 22 disclosure that remaining tariffs were being offered as bargaining instruments supports this interpretation.
On the alcohol concession specifically: Nanos polling from August 5 found that 74% of Canadians said they would avoid American alcohol [18]. The Angus Reid Institute found 69% said they were unlikely to buy it even if returned to shelves [19]. These measure stated intent, not observed behaviour after restocking. Whether restoring shelf access would restore U.S. producers’ previous sales volumes remains untested until products return broadly enough for actual purchasing behaviour to be measured.
Durable relief received from the United States: CUSMA exemption preserved for most goods (this was already in the agreement and was restored within three days of March 4). Energy, potash, and critical minerals carved out of Section 338. No durable U.S. tariff reduction below March 2025 levels has been secured in any targeted sector. No bilateral trade agreement has been signed. The August 19 framework did not survive to August 22. Talks are suspended with no further rounds scheduled. New Canadian retaliatory tariffs targeting U.S. steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics are announced for September 8 but are not yet in effect [10].
What Would Change This Assessment
Three conditions would require revising the comparison documented above. Each is specific and testable.
- Durable sectoral relief. If the currently targeted sectors obtain tariff treatment no worse than their March 2025 effective rates for at least 90 consecutive days, the finding of sectoral deterioration requires revision.
- Bilateral agreement. If Canada and the United States implement a binding agreement, executive arrangement, or other durable framework that materially reduces current tariff exposure in targeted sectors and provides stable terms, the finding that no durable agreement has been secured fails.
- Trade concentration shift. If the U.S. share of Canadian merchandise exports falls by at least 3 percentage points from its 2024 baseline for four consecutive quarters, and real exports to non-U.S. markets rise rather than the shift being caused primarily by falling U.S. exports (Statistics Canada Table 12-10-0011-01), the finding that diversification has not yet materially altered Canada’s trade position requires revision.