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CAR Momentum Newsletter: There Are No Winners in a U.S.–Canada Trade War

September 2, 2026

Michigan Business Network

Welcome to the August issue of Momentum! With new U.S. tariffs enacted on August 22nd and swift Canadian retaliatory measures following on August 25th, cross-border automotive operations face disruption. In this edition, CAR analyzes the critical numbers behind the trade dispute and what this shifting policy landscape means for automakers, suppliers, and North America’s long-term global competitiveness.

There Are No Winners in a U.S.–Canada Trade War

By Edgar Faler, Principal Mobility Analyst and Strategy Lead, and

Tyler Harp, Industry Economist

The escalating tariff conflict between the United States and Canada is entering a consequential and potentially disruptive phase. On August 25, Canada announced retaliatory tariffs of up to 50% on more than 700 U.S. products, effective September 8. The action follows the August 22 U.S. implementation of 50% tariffs on roughly $20 billion worth of Canadian goods and the August 24 U.S. announcement of new 50% tariffs on Canadian vehicles, steel, and other products, with the automotive measures taking effect January 1, 2027. In one of the world’s most integrated trading relationships, tariffs and retaliation do not stop at the border. They raise costs, disrupt supply chains, increase investment uncertainty, and ultimately weaken competitiveness on both sides.

The Automotive Industry Underscores What Is at Stake

The automotive industry is a prime example of the integration between the U.S. and Canadian economies. Canada remains the largest U.S. export market for the automobile and light duty vehicle, heavy duty truck, and motor vehicle parts industries. During the first half of 2026, Canada accounted for:

45% of U.S. automobile and light duty motor vehicle manufacturing exports
79% of U.S. heavy duty truck manufacturing exports
39% of U.S. motor vehicle parts manufacturing exports

The integration goes well beyond finished vehicle trade. In 2025, the U.S. exported approximately $30 billion in auto parts to Canada and imported around $20 billion in Canadian auto parts – resulting in a roughly $10 billion U.S. motor vehicle parts trade surplus.

Those U.S. parts are also reflected in Canadian vehicle production. In 2024, more than 53% of the value of Canadian light vehicle exports originated in the United States. By comparison, overseas produced vehicles sold in the U.S. contain very little U.S. content: 95% of overseas assembled carlines imported into the U.S. contain 5% or less U.S. content for the 2026 model year.

A tariff on a Canadian built vehicle does not simply affect Canadian production. It also affects substantial U.S. content embedded in that vehicle and the U.S. suppliers, workers, and production supporting it. Tariffs on Canadian vehicles therefore have significantly greater implications for U.S. industry than tariffs on vehicles imported from overseas.

A 50% Tariff Creates Significant Supply Chain Risk

Automotive production depends on tightly synchronized cross border supply chains that cannot adjust quickly. Whether immediate or delayed (until 2027, as proposed), a 50% tariff creates significant risk of supply chain disruption in both countries. Delayed implementation can create additional disruption as companies adjust inventory and production ahead of the tariff, potentially resulting in stockpiling, parts shortages, and higher costs.

Furthermore, the potential disruption extends beyond vehicles. Canada is the largest foreign source of steel for the United States and, during the first half of 2026, was the second largest source of U.S. heavy duty truck and motor vehicle parts imports by value, behind Mexico. Disruption to these trade flows could therefore affect U.S. manufacturing and supply chains more broadly, not just Canadian exporters.

The Impact Will Be Shared, but Canada’s Exposure Is Greater

Canada is substantially more dependent on the U.S. automotive market than the U.S. is on Canada. During the first six months of 2026, the United States accounted for approximately:

92% of Canadian automobile and light duty motor vehicle manufacturing exports
99% of Canadian heavy duty truck manufacturing exports
90% of Canadian motor vehicle parts manufacturing exports

A sustained 50% tariff would significantly increase the U.S. cost of Canadian products and likely accelerate substitution toward U.S. production or alternative import sources. Canada therefore faces greater direct economic exposure. But because Canadian automotive production contains substantial U.S. content and depends on U.S. suppliers, the economic consequences will extend to both sides of the border.

Further Investment Pauses and Delays Are a Longer-Term Risk

North American automotive investment is already facing pauses and delays. The industry is navigating an EV market pivot, existing tariffs and trade uncertainty, rising commodity and input costs, labor constraints, and changing product strategies. Together, these pressures have resulted in significant changes to investment plans.

Further tariff escalation adds another significant source of uncertainty to capital decisions that require years of planning and substantial financial commitments. Rather than immediately shifting production from Canada to the United States, companies may pause or delay investment, scale back plans, or redirect capital elsewhere until the rules governing North American trade become clearer. These decisions cascade through the supply chain, affecting supplier capacity, tooling, manufacturing equipment, hiring, and technology investment.

The Priority Should Be North American Competitiveness

A renewed U.S.–Canada trade agreement should restore predictability while strengthening North American competitiveness. The strategic objective should be greater North American content, stronger supply chain resilience, and less dependence on offshore sources without disrupting an integrated U.S.–Canadian production base that already incorporates significant U.S. content and supports U.S. suppliers and workers.

A prolonged U.S.–Canada trade war risks raising costs, disrupting production, delaying investment, and making North American manufacturing less globally competitive. There are no winners.