Canadian exporters got about 90 minutes of warning. The Section 338 tariffs were due to take effect at 12:01 am Eastern on Wednesday, August 19, and late Tuesday night President Trump paused them until the end of day Friday, August 21.
Trump described the reason on Truth Social as the fact that Canada and the United States have a deal, subject to the finalization of documents. Prime Minister Mark Carney’s statement, issued about an hour later, did not use that word. It said substantial progress has been made, although there is important work still to be done, and confirmed only that the United States had agreed to postpone implementation until August 21.
That gap between the two statements is the whole story. Nothing has been signed, no text has been published, and workers in the affected sectors have three days of uncertainty rather than resolution.
What the tariff actually is
On July 20 the president signed three proclamations invoking Section 338 of the Tariff Act of 1930, a provision that allows duties of up to 50 percent against a country found to discriminate against US commerce. It has never been used this way before.
The rate is an additional 50 percent ad valorem, the statutory maximum. The stated justification covers Canadian treatment of American motor vehicles, alcohol and dairy, but the annexes reach much further, into goods such as wine, hockey sticks, cement, furniture and plywood.
Two features make it different from the tariff measures Canadian businesses have already absorbed. A valid CUSMA certificate of origin does not exempt covered goods, and the duty stacks on top of tariffs that already apply. Energy, potash, fish, certain critical minerals and goods already subject to Section 232 are excluded.
Coverage is roughly $20 billion in annual imports, about 5 percent of what the United States bought from Canada last year. Oxford Economics put it closer to 5.5 percent of exports to the US. One analysis calculated that the average tariff rate on Canadian exports would rise from 4.68 percent to 6.27 percent if the measures proceed.
The detail that catches exporters out
The duty is triggered by entry, not by shipment. US Customs and Border Protection calculates duty based on the date a shipment is entered for consumption at the border, which in practice means the arrival date rather than the date it left the Canadian facility.
Canadian practice generally works the other way, assessing timing based on when goods ship. The consequence is that a load leaving Canada on the final day before a deadline but arriving afterward attracts the full duty. With a deadline now sitting at the end of a Friday, that distinction matters for anything currently in transit.
Goods admitted to a US foreign trade zone on or after the effective date must enter under privileged foreign status and will attract the duty on consumption entry, which closes the usual workaround.
What this means if you work in an exposed sector
For employees, a three day pause is not the same as relief. Production planning, shift scheduling and hiring decisions do not restart on a 72 hour horizon, and employers facing a possible 50 percent duty on Monday are unlikely to commit to anything before they know the answer.
The practical point is that the protections available to workers do not depend on Friday’s outcome. EI temporary measures currently waive the one week waiting period, suspend the treatment of severance as earnings, and give long tenured workers up to 20 additional weeks of benefits. Those measures expire on October 10, 2026, and that date sits in regulation rather than in a trade negotiation.
Work-Sharing is the other route, and it runs considerably longer. The tariff related flexibilities extend agreements to a maximum of 76 weeks and remain available until March 31, 2027. More than 1,500 agreements had been approved as of February, covering over 50,000 workers and preventing close to 20,000 layoffs. It is the option most employees have never heard of and most small employers do not realise they now qualify for.
Our guide to the EI measures expiring October 10 sets out how each rule works and what a claim is worth on either side of that date.
What it means for prices and rates
The macroeconomic effect is limited by design. RBC noted that the narrow coverage means the measures are unlikely to derail the broader recovery, with most Canadian exports to the US still protected by CUSMA exemptions, and that it continues to expect the Bank of Canada to hold the overnight rate unchanged through the remainder of 2026.
BMO reached the same conclusion after Monday’s inflation release, pointing to strong GDP and jobs reports alongside the tariff deadline, and saying the inflation side looks stable and well behaved.
For households, that means the more immediate pressure on budgets is coming from energy prices rather than trade policy. Inflation rose to 3.0 percent in July on the back of a 25.7 percent annual increase in gasoline.
What happens Friday
Reporting suggests what exists is the beginning of a framework rather than a completed agreement, with Canada dropping remaining retaliatory measures, the United States dropping some of the Section 338 tariffs, and both sides continuing to talk. Industry sources have said the two governments have also discussed Section 232 tariffs.
Three outcomes are possible: an agreement that removes or narrows the tariffs, another extension, or the duties taking effect at 12:01 am on Saturday. Section 338 carries no limit on how long tariffs can remain in place once imposed, and no investigation is required to justify them, which is part of why the provision gives Washington leverage in the broader CUSMA renegotiation.
Anyone with goods in transit should be working backward from realistic arrival and entry timing rather than forward from a planned ship date.
Frequently Asked Questions
Are the tariffs cancelled?
No. They are postponed until the end of day Friday, August 21. No agreement text has been published and the Canadian government has not confirmed any contents.
Does CUSMA protect my employer’s goods?
Not for goods listed in the annexes. Section 338 applies regardless of whether a product qualifies for preferential treatment under the agreement, which is what distinguishes it from earlier measures.
If the tariffs go ahead, do EI rules change?
No. The EI temporary measures and their October 10, 2026 expiry are set in the Employment Insurance Regulations and are not affected by the trade outcome.
Will this push up consumer prices in Canada?
These are US duties on Canadian goods entering the United States, so the direct effect falls on US importers. The risk to Canadian households runs through employment in exporting sectors rather than through retail prices.
Sources: proclamations signed July 20, 2026 under Section 338 of the Tariff Act of 1930; statements from the Prime Minister’s Office and the White House, August 18 and 19, 2026; RBC Economics and BMO commentary, August 17, 2026. Last updated: August 19, 2026.