President Donald J. Trump issued a proclamation dated September 8, 2026, modifying which products from Canada are subject to an additional 50% ad valorem duty imposed to offset what the White House characterizes as Canadian discrimination against U.S. commerce in motor vehicles.
What changes on September 15
According to the proclamation, effective 12:01 a.m. ET on September 15, 2026:
- Products listed in Annex I, Part A will be subject to the 50% duty imposed pursuant to Proclamation 11048.
- Products listed in Annex I, Part B will no longer be subject to that 50% duty.
- The Harmonized Tariff Schedule of the United States (HTSUS) is modified as provided in Annex II.
- These duties apply in addition to any duties imposed under section 232 of the Trade Expansion Act of 1962.
The proclamation states these changes apply to goods “entered for consumption, or withdrawn from warehouse for consumption” on or after the effective time.
Why the White House says it’s acting
The document cites earlier actions. In Proclamation 11048 of July 20, 2026, Trump “found as a fact that Canada is discriminating in fact against the commerce of the United States through Canada’s motor vehicle tariff scheme,” concluding that the imposition was “unreasonable,” “not equally enforced upon the like articles of every foreign country,” and that it “places a burden on the commerce of the United States.”
In Proclamation 11056 of August 18, 2026, he temporarily suspended the effective date of the additional duties for three days “after Canada expressed a commitment to remove the discrimination.” The new proclamation states that, on August 21, 2026, “Canada reneged on its commitment, ceased negotiating in good faith, and did not remove the discrimination,” after which the suspension lapsed and the duties took effect at 12:01 a.m. ET on August 22, 2026.
The proclamation adds that senior executive branch officials advised that modifying the scope of covered products would still offset the burden on U.S. commerce and “better serve the public interest.” Based on this and other considerations, Trump determines that the public interest requires modifying the scope.
Legal authority and implementation
The proclamation cites section 338 of the Tariff Act of 1930 (19 U.S.C. 1338), which, as described in the document, authorizes the President to impose additional duties up to 50% ad valorem to offset an unequal imposition or discrimination, to suspend or amend such actions, and to exclude articles if the foreign country maintains or increases the discrimination. It also cites section 604 of the Trade Act of 1974 (19 U.S.C. 2483) and 3 U.S.C. 301.
The Commissioner of U.S. Customs and Border Protection (CBP), in consultation with other named officials, is authorized to issue rules, guidance, and determinations to implement the proclamation and to make any necessary HTSUS modifications through Federal Register notice, including technical or ministerial corrections to the annexes. For rules implementing the proclamation, CBP must obtain required approvals; the United States Trade Representative is delegated the President’s approval authority in 19 U.S.C. 1338(h).
The proclamation states that any inconsistent provisions of prior proclamations or Executive Orders are superseded to the extent of the inconsistency and includes a severability clause.
What’s not in this document
The specific products added to or removed from the 50% duty are contained in Annex I (Parts A and B) and the HTSUS changes in Annex II. Those annex lists were referenced but not provided in the supplied text.
