Section 338 tariffs on Canadian imports change October 30, 2026, with specified products removed and others added.

What changed

On October 23, 2026, President Donald J. Trump signed a proclamation under Section 338 of the Tariff Act of 1930 further modifying Proclamation 11048, as amended. The action changes the product scope of additional Section 338 tariffs applicable to certain Canadian imports.

Products removed from the Section 338 tariff scope include, as described in the fact sheet:

• Plywood sheets
• Certain paper products
• Certain machinery
• Refrigeration equipment
• Certain packing crates and boxes

Products added to the Section 338 tariff scope include, as described in the fact sheet:

• Certain valves
• Carpets
• Waste products
• Other products identified in the implementing proclamation and its annexes

The fact sheet does not state the specific HTSUS classifications for the affected products. No HTS codes are therefore listed in this briefing.

Affected imports and tariff treatment

The modified Section 338 tariffs apply to covered goods imported from Canada regardless of whether the goods qualify for preferential treatment under the United States-Mexico-Canada Agreement (USMCA). The Section 338 duties also apply in addition to tariffs imposed under Section 232 of the Trade Expansion Act of 1962, where applicable.

The fact sheet does not provide the applicable Section 338 duty rate, the prior duty rate, or the new duty rate. Importers must consult the implementing proclamation and any associated HTSUS amendments or U.S. Customs and Border Protection guidance for the exact additional duty rate and entry reporting requirements.

Dates

• Announcement/signature date: October 23, 2026
• Effective date for product additions and removals: October 30, 2026
• Expiration date: Not stated in the fact sheet

Required actions

Importers and customs brokers should:

• 1. Obtain and review the October 23, 2026 Section 338 proclamation, including all product annexes and any associated HTSUS instructions.
• 2. Identify Canadian-origin products in the affected categories, including valves, carpets, waste products, plywood, paper products, machinery, refrigeration equipment, and packing crates or boxes.
• 3. Confirm the exact HTSUS classifications and determine whether each product is added to or removed from the Section 338 scope effective October 30, 2026.
• 4. Update customs entry templates, duty-rate tables, classification databases, broker instructions, and landed-cost calculations before October 30, 2026.
• 5. Verify that USMCA qualification does not incorrectly eliminate the Section 338 duty, because the fact sheet states that the tariffs apply regardless of USMCA origin treatment.
• 6. Separately evaluate any applicable Section 232 duties and confirm whether those duties remain payable in addition to the Section 338 tariff.
• 7. Review entries filed on or after October 30, 2026 for correct additional-duty reporting and retain supporting classification and origin documentation.

Rates and HTS metadata

• Section 338 rate change: Specific old and new rates are not stated in the source.
• Affected HTS codes explicitly stated in the source: None.

Reference

• White House, “Fact Sheet: President Donald J. Trump Further Modifies Canadian Products Subject to Tariffs Under Section 338,” October 23, 2026.
• The implementing presidential proclamation and any HTSUS annexes or CBP instructions should be obtained from the White House and CBP official publications for the precise tariff rates and classifications. The source notice supplied does not include a direct PDF or proclamation URL.