The US-Canada tariff war escalates as Ottawa's counter-duties take effect

Canadian retaliation now covers roughly $20 billion of US goods, even as Washington lifts one punitive levy on Canadian spirits.

Assembled by Claude from 7 sources at 7 outlets · Saturday, September 12, 2026, Morning edition, 10:13 AM EDT · no human byline

What happened

The US-Canada tariff war has escalated once again, with Canada imposing retaliatory tariffs on approximately $20 billion worth of US goods alongside bans on certain products news.metal.com. The latest round of Canadian counter-tariffs took effect on September 8, applying duties of 15%, 25% and 50%, according to Retail Insider retail-insider.com. As part of that round, the federal government targeted corrugated boxes and cartons with a 50 per cent tariff, CTV News reported ctvnews.ca.

Movement is not all in one direction. President Donald Trump has removed the 50% tariff on bulk Canadian whisky and liqueurs, effective September 15, in what Newsquawk described as the removal of a punitive levy on a narrow category newsquawk.com.

Why it matters to investors

Tariffs on packaging and inputs land on cost lines rather than on headline consumer goods, which is why the corrugated-box duty matters more than its size suggests ctvnews.ca. Vegetable producers have received relief from the new counter-tariffs, an exemption that itself signals where the cost pressure was biting ctvnews.ca. On the retail side, Empire has been rejecting tariff-related supplier price increases and says it has seen limited tariff impact so far retail-insider.com. News Metal described the escalation as another round in a war of retaliatory measures and outright bans on goods, rather than a single tariff adjustment news.metal.com.

The inflation argument is now explicit in Canadian politics. Pierre Poilievre said a US-Canada trade detente would ease inflation pressures, arguing that Canada's oil and mineral resources can help alleviate US inflation but that the Trump administration needs to back off its tariff policies financialpost.combloomberg.com. That places the tariff file directly alongside the US inflation debate rather than beside it.

What to watch

Canada is trying to convert the disruption into capital inflows. The Financial Times reported that Canada is seeking $1tn from investors looking for a haven from Trump's volatility, through an investor summit hosting a C$120tn pool of global capital, equivalent to US$87tn ft.com. The summit is an attempt to turn a trade dispute into a case for foreign capital, at a scale far larger than the tariffs themselves ft.com.

Three things will show which way this runs. Whether the whisky exemption effective September 15 is the first of a series of narrow rollbacks or an isolated gesture newsquawk.com. Whether more Canadian exemptions follow the relief granted to vegetable producers ctvnews.ca. And whether retailers can keep refusing supplier price increases as the 15%, 25% and 50% duty bands work through inventory retail-insider.comnews.metal.com.

Sources

1. news.metal.com: US-Canada Tariff War Escalates: Retaliatory Measures and Bans on Goods Imposed (2026-09-12)
2. retail-insider.com: Empire Rejecting Tariff -Related Supplier Price Hikes as Trade Tensions Escalate (2026-09-12)
3. newsquawk.com: Trump removes 50% tariff on bulk Canadian whisky and liquers, effective September 15th (2026-09-12)
4. ctvnews.ca: Vegetable producers receive relief from Ottawa's new counter tariffs - CTV News (2026-09-12)
5. financialpost.com: U.S.-Canada trade detente would ease inflation pressures, Poilievre says - Financial Post (2026-09-11)
6. bloomberg.com: US-Canada Trade Detente Would Ease Inflation Pressures, Poilievre Says - Bloomberg (2026-09-11)
7. ft.com: Canada seeks $1tn from investors looking for a haven from Donald Trump - Financial Times (2026-09-12)