US-Canada Trade War Escalates: Perspectives and Solutions for US Firms

05 October 2026 / Backgrounder

Trade relations broke down as Canada and the US ended formal USMCA negotiations and instituted tariffs on a variety of goods covering about $40 billion in trade (US$20 billion of products imported into each country). With duties levied on 5-6% of annual bilateral trade as relations degrade, and nonrenewal of the USMCA, businesses face higher costs, increased uncertainty, and supply chain fragmentation.

Trusted Insights for What’s Ahead^®

The US recently introduced two new tariff mechanisms: Section 301 duties ranging from 10 to 12.5%, and 50% Section 338 tariffs targeting Canadian products like automobiles, dairy, and alcoholic beverages. Canada responded with matching tariffs between 15 and 50%.
The most exposed industries are metals, automotive manufacturing, dairy and food products, forestry, machinery, electronics, household appliances, apparel, alcoholic beverages, and recreational equipment. Notably energy, the most significant product traded between the countries—and a critical one at that—is not included in these tariffs.
The drag on GDP for both countries is muted, but the impact on businesses with integrated supply chains and communities reliant on US-Canadian cross-border trade may be acute.
Tariff escalations, and the lack of formal negotiations, bode ill for North American cooperation as Canada, Mexico, and the US pursue unilateral United States-Mexico-Canada Agreement (USMCA) negotiations after the US opted for nonrenewal in July.
Businesses caught in the middle of the intensifying trade war face increased compliance costs given more complex trade rules, shrinking customer bases, and reduced revenues. Against this backdrop, firms should map tariff exposure and selectively diversify suppliers.