President Trump Invokes Obscure 1930 Tariff Act, Imposing 50% Tax on Canadian Imports

WASHINGTON – President Donald Trump initiated a new trade dispute with Canada on August 28, 2026, by imposing a 50% tax on approximately $20 billion worth of Canadian imports. The move, which has already prompted dollar-for-dollar retaliation from Ottawa, utilized Section 338 of the Tariff Act of 1930, a 96-year-old statute so obscure that many trade lawyers were reportedly unaware it remained active. This unprecedented application of the law has created significant legal and economic uncertainty for businesses engaged in cross-border trade.

The invocation of Section 338 marks the first time any U.S. president has employed this particular authority. Legal experts and former U.S. trade officials have expressed surprise and concern over its use. Ryan Majerus, a partner at King & Spalding and a former U.S. trade official, characterized the statute as “literally a blank canvas” due to its complete lack of prior litigation. This absence of judicial precedent means the legal viability of Trump’s latest tariffs remains untested and highly questionable, with some lawyers suggesting the Depression-era law may have been rendered obsolete by more recent trade legislation.

Legal scholars Peter Harrell and Jennifer Hillman of Georgetown University noted in a recent publication that “Until Trump’s second term, few trade lawyers were aware that Section 338 remained on the books or understood what it did.” State Department records indicate that the U.S. government considered using Section 338 in trade disputes against Spain in 1932 and newly Communist China in 1949, but ultimately chose not to proceed. Following the Great Depression, U.S. trade policy largely shifted away from sanctions in favor of negotiations to open foreign markets, leaving Section 338 to languish in legal texts for decades.

The immediate impact of these tariffs is a significant increase in costs for U.S. small and mid-sized businesses that import goods from Canada, affecting an estimated $20 billion in trade. These businesses now face a sudden 50% increase in their import expenses, which will likely be passed on to consumers or absorbed, impacting profitability. The retaliatory tariffs from Canada mean that U.S. exporters to Canada will also experience increased costs, further straining supply chains and potentially reducing demand for American products in the Canadian market. This bilateral escalation threatens to disrupt established trade relationships and operational frameworks for countless companies reliant on the stability of U.S.-Canada commerce.

For small and mid-sized companies, the operational consequences extend beyond mere cost increases. Businesses may need to rapidly re-evaluate their sourcing strategies, explore alternative suppliers, or adjust their pricing models to account for the new tariffs. The uncertainty surrounding the legal challenge to Section 338 adds another layer of complexity, making long-term planning difficult. Companies heavily integrated into North American supply chains, particularly those in sectors targeted by the tariffs, face immediate pressure to adapt to these new trade barriers.

In our experience, the sudden reintroduction of obscure trade statutes like Section 338 creates a volatile environment that can severely impact the financial health and operational continuity of small and mid-sized businesses. The lack of clarity around the legal enforceability of these tariffs, coupled with the immediate retaliatory measures, necessitates a proactive and agile response from business leaders. We’ve seen clients struggle to quickly pivot when established trade norms are upended, underscoring the critical need for expert guidance in navigating complex regulatory shifts. C&S Finance Group LLC specializes in helping companies manage such disruptions through comprehensive supply chain optimization strategies, ensuring businesses can adapt to new tariffs, mitigate risks, and maintain operational efficiency. We encourage any business affected by these tariffs to contact C&S Finance Group LLC at csfinancegroup.com to explore tailored solutions.

Looking ahead, the legal challenges to President Trump’s use of Section 338 are expected to be significant, potentially leading to prolonged court battles that could further prolong uncertainty for businesses. The outcome of these challenges will not only determine the longevity of the current tariffs but also set important precedents for presidential authority in trade policy. Businesses should closely monitor legal developments and be prepared for potential shifts in trade regulations as this unprecedented situation unfolds.