Act nowU.S. Customs and Border Protection · OtherEffective Sep 15, In force5/5 quoted sentences found in the source

122 more Canadian product lines carry the 50 percent Section 338 duty from September 15

CBP's guidance implements the September 8 proclamations that redraw the list of Canadian products subject to the additional 50 percent Section 338 duties. As of September 15, 122 additional tariff classifications fall under headings 9903.03.12 and 9903.03.14, a handful of lines come off (including salt, cement, certain paper, lead, and fishing rods), and the alcohol-related heading 9903.03.13 is unchanged. The complete list is an attachment to the CBP message.

EffectiveSeptember 15, 2026
Lines added122 additional HTSUS classifications
Rate50% additional ad valorem

What the document says

Matched to source. The new list applies to goods entered from September 15.
Matched to source. 122 tariff classifications were added to the 50 percent headings.
Matched to source. The heading tied to the dairy proclamation is unchanged.
Matched to source. A short list of classifications no longer carries the duty.
Matched to source. The rate on the listed goods is an additional 50 percent.

Who does this affect?: Anyone importing goods of Canadian origin. The Section 338 lists are not limited to vehicles and drinks: the lines removed this week include salt, cement, paper, lead, and fishing rods, and 122 lines were added, so a product that was outside the duty last week may be inside it now.
What it costs: An additional 50% ad valorem duty on every Canadian-origin line added to the list, for goods entered on or after September 15, 2026, on top of any other duty the line already carries.
What to check: Ask your broker for the attachment to CSMS 69851916 and check every Canadian-origin tariff number you import against the bold lines; for any line that came off the list, ask whether entries filed since September 15 still carried heading 9903.03.12 or 9903.03.14.

The headline, summary, who, cost, and what-to-check lines are our reading of the document, not the document’s words and not advice.

Primary source

CSMS #69851916: Modifying Section 338 Additional Duties on Certain Goods of Canada