Canada's retaliatory tariffs hit e-commerce: what you need to know

Canada has implemented retaliatory tariffs on $27.6 billion worth of US goods, effective September 8, with surtax rates of 15%, 25%, or 50% depending on product classification and origin. This response follows the US imposing 50% tariffs on Canadian imports on August 22. These measures create immediate operational complexity for e-commerce brands because tariff exposure depends on where products are manufactured or substantially transformed, not simply where they are warehoused or shipped. The challenge extends beyond simple rate calculations.

Nearly 900 tariff line items are affected, spanning apparel, electronics, cosmetics, furniture, machinery, and agricultural products. E-commerce operators must determine country of origin and Harmonized System (HS) classification for each SKU to assess exposure. Additionally, these tariffs apply as surtaxes on the dutiable value, increasing the base on which other taxes such as GST and HST are calculated, compounding the landed cost impact. For supply chain professionals, the broader concern is structural uncertainty.

The USMCA review process entered annual renewal cycles when the US did not confirm continuation in July 2026, creating unpredictability in trade rules. Brands must now balance operational responses (inventory positioning, fulfillment location diversification, pricing adjustments) against the reality that conditions could shift again rapidly. The incident underscores how quickly trade policy changes can reshape cross-border economics and the importance of maintaining accurate tariff data and operational flexibility.