Canada expands counter-tariffs on US goods to CA$27.6bn, matching US Section 338/232 tariffs dollar-for-dollar

Mechanism

This is the second Canadian counter-tariff escalation of the 2026 US-Canada tariff war: after Washington raised its Section 338 duties on Canadian goods to 50% on 2026-08-22 (an underlying US action not yet separately filed in this register — see the already-filed 2026-09-09-us-section-338-canada-import-bans-tariff-modification, whose summary confirms the 22 August 50% Section 338 duties as the proclamations' starting point), Canada responded 2026-09-08 by expanding its own counter-tariff list to CA$27.6bn of US goods across 700+ tariff lines, with rates set dollar-for-dollar against the specific US tariff each targeted Canadian product faces (15/25/50%). Washington's counter-response five days later — the 2026-09-09 Section 338 proclamations imposing outright import bans on Canadian alcohol/dairy and excluding motor-vehicle products — cites this 8 September Canadian action by name as its trigger.

Downstream implications

• Confirms an escalation spiral: US 50% tariff (22-Aug) → Canada CA$27.6bn

counter-tariff (8-Sep, this action) → US import bans + scope modification (9-Sep, already filed) — three moves in 18 days.

• Steel/aluminium flat-rolled products sit at the 50% counter-tariff

ceiling, raising input costs for Canadian manufacturers sourcing semi-finished US steel/aluminium even as it protects Canadian primary producers from US-bound retaliation exposure.

• CUSMA country-of-origin rules gate which goods are captured — transshipped

or substantially-transformed third-country content is not exposed.

Open questions

• Whether the underlying 22 August 2026 US Section 338 50% escalation gets

filed as its own action — it is currently referenced only in the body text of the 9 September response, not as a standalone register entry.