A significant escalation in the trade dispute between the United States and Canada took effect on 22 August 2026, when the US introduced additional 50% tariffs on a specified range of Canadian goods.
The measures followed the breakdown of negotiations between the two countries and were introduced under Section 338 of the US Tariff Act of 1930. This provision allows the US President to impose duties of up to 50% in response to trade practices considered discriminatory towards American commerce.
The tariffs apply to covered goods entered for consumption, or withdrawn from a warehouse for consumption, from 12:01 a.m. Eastern Time on 22 August 2026.
According to the Office of the United States Trade Representative, the original Section 338 actions covered nearly US $20 billion of Canadian imports. Canadian Prime Minister Mark Carney has described the affected trade as approximately C$28 billion.
Which products are affected?
The new tariffs cover specified Canadian-origin products across a range of consumer and commercial categories. These include certain wine and spirits, dairy products, clothing and textiles, furniture, sporting goods such as hockey equipment and fishing rods, and seeds.
However, this is not a blanket 50% tariff on every Canadian product entering the US. The applicable treatment depends on the product’s precise classification under the Harmonized Tariff Schedule of the United States, or HTSUS.
Significant exclusions have also been reported, including certain energy products, potash, fish and critical minerals. Goods already subject to separate Section 232 tariffs are also excluded from the new Section 338 measure.
Businesses should therefore avoid making assumptions based solely on a broad product category. Two apparently similar goods may receive different treatment depending on their composition, origin and eight-digit HTS classification.
USMCA status does not automatically provide an exemption
One of the most important points for companies trading across the US-Canada border is that qualification under the United States-Mexico-Canada Agreement does not automatically remove the additional Section 338 duty from an affected product.
USMCA origin remains relevant to the wider tariff treatment of a shipment, but a covered product may still attract the additional 50% duty even where it qualifies for preferential treatment under the agreement.
This distinction highlights the importance of understanding each tariff measure separately. Preferential origin, standard customs duty, Section 338 tariffs, Section 232 measures and any other applicable trade remedies can operate under different rules.
Businesses need to establish:
- The correct HTS classification for each product
- Whether the goods meet the relevant country-of-origin rules
- Whether the HTS code is included in the Section 338 action
- Whether a stated exclusion applies
- Whether other duties or trade measures could also affect the entry
- Which party is contractually responsible for the resulting costs
At a tariff rate of 50%, an incorrect assumption can have a substantial financial impact. It can alter the landed cost of a product, reduce or eliminate its margin and potentially make an established supply chain commercially unviable.
Canada prepares retaliatory measures
Canada has announced that it intends to respond on a dollar-for-dollar basis, with retaliatory tariffs scheduled to take effect on 8 September 2026.
The proposed Canadian measures are expected to target US goods in sectors including steel, dairy, household appliances, agricultural equipment, pulp and paper, and electronics.
Businesses exporting from the US into Canada should therefore assess their potential exposure now rather than waiting for the countermeasures to take effect. This should include reviewing Canadian tariff classifications, origin information, pricing arrangements and any contracts that determine who must pay additional import duties.
Companies operating supply chains in both directions may face exposure to measures introduced by each country. The combined effect could reach beyond the direct duty payable, influencing sourcing decisions, inventory planning, transport routes, retail pricing and customer demand.
Tariffs are a wider commercial issue
The immediate task for affected importers and exporters is to establish whether their individual products fall within the measures. The wider lesson, however, extends beyond customs compliance.
Tariff changes can quickly reshape the economics of international trade. A product that was commercially viable under one duty structure may require significant repricing when an additional tariff is introduced. Businesses may also need to reconsider supplier relationships, contractual terms, product ranges or the markets in which they operate.
Companies trading between the US and Canada should review:
- Product classifications and supporting technical information
- Country-of-origin evidence
- USMCA eligibility and documentation
- Landed-cost calculations and profit margins
- Incoterms and contractual responsibility for duties
- Goods already in transit or held in customs warehouses
- Exposure to the forthcoming Canadian countermeasures
This development also demonstrates why customs data must form part of wider commercial planning. Accurate classifications and origin records are essential, but businesses must also be able to translate regulatory changes into reliable landed-cost calculations and timely operational decisions.
The US-Canada trading relationship is one of the largest in the world, and any disruption can have consequences across deeply integrated North American supply chains. With further changes possible as the dispute develops, businesses should continue monitoring official notices and reviewing their exposure at individual product level.
UKP Worldwide will continue to monitor this development alongside the wider tariff and regulatory changes affecting international trade.
Information correct as of 24 August 2026. Tariff measures can change at short notice. Businesses should confirm the treatment of individual products using the relevant official tariff schedules and customs guidance.