Canada's $27.6 Billion Counter-Tariffs Take Effect, Matching U.S. Section 338 Duties Line for Line

Canada's counter-tariffs on $27.6 billion of U.S. imports took effect September 8, the Department of Finance confirmed, closing out a two-week window between announcement and enforcement that gave customs brokers on both sides of the border time to reclassify shipments but little time to reroute supply chains.

The measure is a direct mirror of the U.S. action that triggered it. On August 22, the United States imposed 50% Section 338 duties on $27.6 billion of Canadian goods. Canada's Department of Finance says its response matches "dollar for dollar," applying the same 15%, 25% and 50% tiered rate structure the U.S. used, across a comparable dollar value of trade, rather than escalating past it. Ottawa is also standing up a C$7.5 billion support package for workers and businesses affected by the new duties, though the department has not yet published disbursement criteria or a timeline.

What's on the list

The Canadian schedule runs to more than 600 tariff classifications. The 50% tier — the same rate the U.S. applied to Canadian steel, aluminum and dairy — hits American steel and aluminum products (ingots, bars, rods, wire, tubes and pipes), dairy concentrates and powders, pulp and paper goods, plywood and laminated wood, consumer electronics including smartphones and gaming consoles, apparel, plastics and rubber articles, cosmetics, and sporting goods such as golf clubs and exercise equipment. A 25% tier covers lumber, steel and aluminum household goods, appliance parts, carpets, cutlery and cheese. A lighter 15% tier applies to forklifts, agricultural machinery parts, air conditioners and industrial molds — the same categories that drew the lowest U.S. rate under Section 338.

The Department of Finance notice states the tariffs apply only to goods that qualify as U.S.-origin under CUSMA rules of origin, and that goods already in transit to Canada as of September 8 are exempt — a narrower carve-out than the 21-day transit grace periods that accompanied some earlier rounds of North American tariff actions. The Canada Border Services Agency is expected to issue Customs Notices with tariff-classification and enforcement detail; none had been published as of filing. Existing remission-request frameworks remain open for importers seeking case-by-case relief, though Finance has not indicated whether remission requests tied to this round will be processed faster than the backlog built up since Section 338 duties began landing on Canadian exporters in the spring.

Who absorbs it

The forklift and agricultural-machinery-parts line in the 15% tier is a reminder that this fight runs both directions through industrial supply chains, not just consumer goods. Roughly 40% of members of the Canadian Federation of Independent Business who export goods now face the 50% U.S. rate on their outbound shipments, according to reporting on the group's own membership survey — meaning many of the same firms filling out Canadian customs entries for U.S. steel or dairy this week are also the ones paying the U.S. side of the tariff wall on what they ship south.

What this means for cross-border freight

Four things brokers and 3PLs moving freight across the northern border should be tracking now:

• Reclassification risk on mixed consignments. With three separate rate tiers spanning 600-plus HTS lines, a single consolidated shipment carrying, say, appliance parts and finished electronics can straddle the 15%, 25% and 50% tiers within one entry. Brokers should expect more line-item audits from CBSA in the first weeks of enforcement, before classification patterns settle.
• The September 8 transit cutoff is a hard line, not a window. Unlike rounds that gave importers a multi-week grace period for goods already loaded or in transit, this one exempts only cargo that was already moving as of the effective date itself — freight forwarders should confirm bill-of-lading dates now rather than assume a buffer exists.
• CUSMA-origin certification just got more valuable. Because the counter-tariffs apply only to goods meeting CUSMA's U.S.-origin definition, shippers with mixed or reprocessed-content goods have a real incentive to run origin determinations before the CBSA does it for them at the border.
• Remission requests are a live lever, not a formality. With no fast-track confirmed for this round, brokers advising clients to file remission requests should set expectations around the existing backlog rather than the political urgency of the announcement.