The 2026 United States Section 338 tariff escalation on Canadian goods: the operative rate, predicates, and dates, from the primary documents

Three presidential proclamations under section 338 of the Tariff Act of 1930, signed 2026-07-20, each imposing an additional 50 percent ad valorem duty on certain products of Canada set forth in that proclamation's own Annex II, on a discrimination predicate specific to each proclamation (alcoholic beverages, dairy, motor vehicles respectively), the section 232 and WTO civil-aircraft exclusions each proclamation states, each proclamation's own Annex I -- named once, in each proclamation's own additivity clause, as a possible exception to the rule that these duties stack with other duties, its contents not in the transcribed prose -- the scheduled-to-actual effective-date divergence a fourth proclamation created, and the Government of Canada's own 2026-08-21 and 2026-08-22 statements of retaliatory intent. This entry follows this record's earlier Resolution on the 2025 United States tariff actions on Canadian goods, and does not edit or supersede it Extended 2026-08-25 with the Department of Finance Canada's own concretization of Canada's retaliatory intent: the counter-tariff rate schedule (15, 25, and 50 percent, which the government states matches the corresponding U.S. rate for each product), its own $27.6 billion scope figure -- the release's own precise restatement of the earlier 'roughly $28 billion' figure, and, by the same announcement's dollar-for-dollar design, the matching value of the U.S. goods Canada's own counter-tariffs will apply to -- an effective date of 2026-09-08, and a $7.5 billion support package for tariff-affected workers and businesses, on top of the government's own stated nearly $25 billion in supports over the prior 18 months.