U.S.-Canada tariff changes begin Sept. 15; import exclusions set for Sept. 29
Two deadlines now govern the next phase of the U.S.-Canada trade dispute: changes to the list of Canadian products facing additional duties begin September 15, while targeted import exclusions are scheduled to begin at 12:01 a.m. Eastern time on September 29.
President Donald Trump signed five Section 338 proclamations on September 8 after Canada imposed new retaliatory tariffs on about $20 billion of U.S. exports, according to the White House. The administration says Canada maintained or increased discriminatory treatment of U.S. commerce, a position also cited by the U.S. Trade Representative. Those statements describe the administration’s rationale and are not independent findings.
The principal dairy-related exclusion proclamation was filed for public inspection on September 11 and is scheduled for Federal Register publication on September 14, 2026. The signed proclamation is the operative legal document for the scheduled September 29 action, while the publication date matters for the public record and implementation process.
What changes on September 15
The first deadline concerns additions and removals from the additional-duty lists. The White House says products including rock salt and cement were removed from tariff coverage and replaced with other products, including additional dairy goods and all-terrain vehicles.
Associated Press reporting also identified toilet paper, bedsheets and fishing rods among products removed from the tariff list. Importers should not rely on those general descriptions alone: the final proclamation language, annexes and applicable Harmonized Tariff Schedule of the United States provisions control the scope of the action.
What is scheduled for September 29
The September 29 measure is different from an additional duty. The Federal Register proclamation directs that specified Canadian products be excluded from importation into the United States beginning at 12:01 a.m. Eastern time on that date.
The dairy-related annex specifically lists HTSUS provisions for whey protein concentrates, several forms of modified and dried whey, multiple molasses classifications and non-alcoholic beer. Independent Associated Press reporting says the broader set of September 8 actions also covers selected alcoholic beverages and larger-engine motorcycles and mopeds.
The action does not ban all Canadian alcohol, dairy products or motorcycles. The proclamation says its product descriptions are informational and do not delimit the legal scope; questions about particular classifications should be directed to U.S. Customs and Border Protection.
How goods already in the pipeline are treated
The transition rule is important for companies with shipments already moving. Covered goods subject to the scheduled import exclusion that were imported but not yet entered for consumption, or withdrawn from a warehouse for consumption, before September 29 remain subject to the 50% duty rate established by Proclamation 11047.
That rule does not mean every Canadian import faces a 50% charge. It applies to goods covered by the relevant Section 338 actions and described in the transition provision. CBP is authorized to issue guidance, administer the import exclusion and make technical or ministerial changes to the HTSUS.
What businesses and consumers should watch
Importers, distributors, retailers, restaurants and manufacturers with Canadian supply chains face two separate compliance dates. They may need to review product classifications, shipment timing, warehouse status, entry documentation and sourcing plans before making decisions based on the new rules.
Some businesses may seek alternate suppliers or adjust inventories, particularly for affected alcohol, food ingredients and recreational vehicles. Consumers could eventually see changes in availability, product selection or prices, but the timing and size of any effect remain uncertain and will vary by product and supply chain.
Canada’s next response is also unsettled. Prime Minister Mark Carney has said Ottawa may hold off on further retaliation while studying the measures, calling them relatively modest compared with earlier U.S. actions. He also acknowledged that the measures could have significant consequences for particular companies and industries. Further changes remain possible before September 29.
Sources
- Federal Register Proclamation 11062
- White House fact sheet on Canada's retaliation
- Associated Press product analysis
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