Five New Section 338 Proclamations on September 8, 2026 Move Canadian Alcohol, Dairy and Motorcycles From a 50% Duty to an Outright Import Ban on September 29 — and Quietly Rewrite the Tariff Product List on September 15
On September 8, 2026 — the same day Canada's roughly $20 billion counter-tariff package on US goods took effect — the White House signed five additional Section 338 proclamations escalating the Canada action in two separate steps. First, two proclamations revise the product scope of the existing 50% Section 338 duty effective September 15, 2026, removing lines such as rock salt and cement while adding others including all-terrain vehicles and additional dairy products. Second, and far more consequential, certain covered Canadian motor vehicle, dairy and alcoholic beverage goods stop being a tariff problem and become an import prohibition: from 12:01 a.m. ET on September 29, 2026 they cannot lawfully enter the United States at all. USMCA origin does not exempt covered goods from either the duty or the ban, and both sit on top of any applicable Section 232 measures. CBP implementation guidance for the five September 8 proclamations was still pending at the time of reporting.
Real-World Impact
The motorcycle ban line is HTS 8711.50.00, defined as engines over 800 cc, so displacement alone decides the outcome: an 801 cc Canadian-built machine falls inside the banned subheading, while a smaller-displacement model classifies under a different 8711 subheading that this specific ban line does not name. For goods that stay on the 50% duty list instead, a unit with a $10 dutiable value still picks up $5.00 in additional duty, or $5,000 on a 1,000-unit purchase order.
Key Points
- Five new Section 338 proclamations were signed on September 8, 2026, on top of the three signed July 20, 2026 that created the original 50% duty effective August 22
- Two of the five revise the product scope of the 50% duty effective September 15, 2026 — rock salt and cement come off the covered lists, all-terrain vehicles and additional dairy products go on. If you checked your HTS codes against the August annexes, that check is now out of date
- From 12:01 a.m. ET on September 29, 2026, certain covered Canadian motor vehicle, dairy and alcoholic beverage goods are prohibited from importation into the United States — not dutiable at 50%, but barred
- Reporting on the banned scope describes certain dairy products with whey named explicitly, most alcoholic beverages, non-alcoholic beer, several types of molasses, and motorcycles and mopeds. For motorcycles the identified line is HTS 8711.50.00, covering motorcycles and cycles with a reciprocating internal-combustion piston engine over 800 cc
- Goods already imported before September 29 but not yet entered for consumption or withdrawn from warehouse remain subject to the existing 50% additional duty rather than the ban
- USMCA origin does not exempt covered goods from either the duty or the import ban, and both apply in addition to any Section 232 duties on the same goods
- The stated justification is a finding that Canada maintained or increased discriminatory treatment of US alcohol, dairy and motor vehicle commerce even after the 50% duties took effect. USTR Jamieson Greer described the action as a consequence of that continued treatment
- CBP guidance for the five September 8 proclamations was still pending as of reporting, so the specific Chapter 99 headings and entry-filing mechanics for the ban had not yet been published — advisories flagged the in-transit and date-of-control questions as unresolved until CBP publishes
What You Should Do Now
- 1Re-run your Canadian-origin SKU list against the September 8 annexes rather than relying on the August check — the September 15 scope revision moved lines in both directions
- 2For anything that lands on the September 29 prohibition list, treat it as a sourcing decision, not a pricing one. There is no duty you can pay to bring a banned line in, so the options are a non-Canadian origin, a different SKU, or exiting the line
- 3Identify every Canadian-origin shipment scheduled to arrive near September 29 and work with your broker on entry timing — goods imported before the cutoff but not yet entered stay on the 50% duty, so the entry calendar is doing real work here
- 4Ask your broker to confirm the Chapter 99 reporting and any in-transit treatment once CBP publishes guidance on the five September 8 proclamations; the operative filing mechanics were not public at announcement
- 5Check whether your covered goods also carry Section 232 exposure — the Section 338 duty and the ban apply in addition to Section 232, and USMCA origin does not relieve either