Key Facts

- President Donald J. Trump signed a proclamation under Section 338 of the Tariff Act of 1930 on Oct 23, 2026 to further modify tariffs on Canadian products [1].

- The modification removes plywood sheets, some paper products, certain machinery and refrigeration equipment, and certain packing crates and boxes, and adds certain valves, carpets, waste products, and other items to the tariff schedule [1].

- The product additions and removals become effective on October 30, 2026 [1].

- The Section 338 tariffs apply to all covered goods regardless of whether they originate under the USMCA, and they are imposed in addition to duties under Section 232 of the Trade Expansion Act of 1962 [1].

- This proclamation follows earlier actions on July 20 and September 8, 2026 that were triggered after Canada walked away from a near‑final trade deal and imposed retaliatory tariffs on about $20 billion of U.S. exports [1].

Trump Refines Canada Tariff Scope

The Oct 23, 2026 proclamation, issued under the authority of Section 338 of the Tariff Act of 1930, formally amends the list of Canadian goods subject to additional U.S. duties. The text states that the President is “further refining the scope of the July 20 and September 8 actions” to better serve the public interest and to continue offsetting the burden to U.S. commerce caused by Canada’s “discriminatory treatment” [1]. By invoking Section 338, the President can suspend, revoke, supplement, or amend any prior proclamation whenever he deems it necessary for the public interest, a power explicitly reaffirmed in the fact sheet [1]. The proclamation is presented as part of a broader effort to protect American workers, farmers, and manufacturers from what the administration describes as unfair Canadian practices.

The background to this action is the collapse of a near‑final trade agreement between the United States and Canada earlier in the summer of 2026, after which Canada imposed new retaliatory tariffs on roughly $20 billion worth of U.S. exports [1]. In response, the Trump administration issued five Section 338 proclamations, beginning with the July 20, 2026 announcement and followed by a September 8 amendment, each expanding the range of goods subject to additional duties [1]. The Oct 23 proclamation is the latest iteration, specifically targeting the product mix to balance relief for some sectors with new pressure on others, reflecting the administration’s stated goal of “offsetting the burden or disadvantage to U.S. commerce” [1].

How the Proclamation Operates

Section 338 grants the President broad discretion to adjust tariff measures without additional congressional action. The proclamation cites this authority directly, noting that the President may “suspend, revoke, supplement, or amend any proclamation under Section 338 whenever the President deems that the public interests require such action” [1]. By exercising this power, the administration can instantly alter the tariff schedule, affecting all covered goods irrespective of their origin under the United States‑Mexico‑Canada Agreement (USMCA). The fact sheet emphasizes that the Section 338 duties are “in addition to tariffs imposed under Section 232 of the Trade Expansion Act of 1962,” meaning that affected imports may face a cumulative duty burden from two separate legal regimes [1].

The specific product changes are detailed in the proclamation. Removed from the tariff list are plywood sheets, certain paper products, a range of machinery and refrigeration equipment, and various packing crates and boxes. Added to the list are “certain valves, carpets, waste products, and others” [1]. This swap reshapes the eligibility of goods for the Section 338 surcharge: firms importing the removed categories will no longer be subject to that surcharge after Oct 30, 2026, while companies exporting the newly listed items will be subject to the surcharge in addition to any existing Section 232 measures. The proclamation does not provide quantitative duty rates; it simply delineates which products are covered.

Compared with the earlier July 20 and September 8 proclamations, this action specifically amends Proclamation 11048, which originally imposed additional duties on motor vehicles [1]. The current amendment expands the scope beyond automobiles to encompass a broader set of industrial and consumer goods, reflecting the administration’s intent to “better serve the public interest” while continuing to “safeguard American workers” from what it characterizes as Canadian discrimination [1]. The continuity of Section 338 authority across all three proclamations underscores a consistent policy approach: using targeted tariff adjustments as a lever to pressure Canada into reciprocal trade practices.

Practical Effects and Industry Impact

Effective Oct 30, 2026, importers of plywood sheets, the specified paper products, the identified machinery and refrigeration equipment, and the packing crates and boxes will no longer incur the Section 338 surcharge on those items. Conversely, exporters of the newly added valves, carpets, waste products, and related items will be subject to the surcharge moving forward. The record does not address how these changes will affect cash flow, landed costs, or competitive pricing for affected firms.

The proclamation does not detail any administrative actions required by U.S. Customs and Border Protection (CBP). Accordingly, the record does not specify whether CBP must update tariff classification databases, nor does it provide a timeline for any such updates. Similarly, the fact sheet does not indicate that importers will need to re‑file entry documents using updated Harmonized System (HS) codes, nor does it outline any new filing obligations for exporters of the added goods. The record does not identify any reporting or compliance deadline beyond the Oct 30, 2026 effective date, leaving firms to await further agency guidance for any additional requirements.

The tariff adjustment fits within the administration’s broader “America First” trade agenda, which the fact sheet frames as using “all the tools at his disposal to restore reciprocity” and to “incentivize companies to reshore jobs” [1]. While the document does not quantify the expected impact on employment or investment, it positions the Section 338 modifications as complementary to other trade‑related initiatives, such as the $21 trillion in total investments cited elsewhere in the administration’s messaging. The record makes clear that the primary purpose of this proclamation is to address Canada’s “discriminatory or unreasonable and unequal practices,” rather than to pursue any other policy objectives.

What to Watch

- The revised tariff schedule takes effect on Oct 30, 2026, triggering immediate changes for affected imports and exports [1].

- The President retains the authority to issue further Section 338 amendments at any time, meaning additional changes could occur without new legislation [1].

- The record does not specify a timeline for CBP system updates or any mandatory reporting deadline beyond the effective date, so firms should monitor future agency guidance for implementation details.

- Stakeholders may watch for any subsequent proclamations or guidance that clarify administrative procedures, compliance timelines, or potential rate adjustments.