U.S. expands 50% tariff to more Canadian goods on Sept 15, 2026

What is happening

• The President modified Proclamation 11048 to change the scope of products from Canada subject to a 50% additional ad valorem duty under section 338.
• The change is effective for goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern on September 15, 2026.

By the numbers

• Additional duty rate: 50% ad valorem (as set under section 338).
• Effective date/time: 12:01 a.m. eastern, September 15, 2026.

What changed (practical point)

• Annex I Part A lists many Canadian product subheadings newly covered by the 50% duty (examples below).
• Annex I Part B lists subheadings that will no longer be covered by the 50% duty.
• Annex II implements modifications to subchapter III of chapter 99 of the HTSUS to reflect these changes.

Selected examples of goods newly covered (Annex I Part A)

• Certain cheeses and dairy substitutes
• Writing, drawing, and graphic paper products
• Aluminum profiles, bars, tubes and pipes
• Iron/steel columns, beams, and structures
• Some vehicle items: golf carts, small passenger cars (≤1,000 cc), certain outboard motorboats
• Furniture and parts (including bent-wood, bamboo, rattan), mattresses
• Lamps and lighting fixtures designed for LED or otherwise

Selected examples of goods removed from coverage (Annex I Part B)

• Salt and pure sodium chloride
• Portland cement (not white)
• Chemically pure sugars
• Toilet/facial tissue and related household paper
• Refined lead (unwrought)
• Certain switchgear assemblies and fishing rod parts

How it will be implemented

• The HTSUS is amended in Annex II; U.S. Customs and Border Protection (CBP), with Treasury, Commerce, and the USTR, will issue any rules, guidance, or further HTSUS updates needed to implement the proclamation.
• Agency heads are authorized to take actions required to implement the proclamation under the cited legal authorities (section 338 and section 604).

Why it matters

• Importers, customs brokers, and supply chains for the listed Canadian products will face the 50% duty (or will no longer face it for the specifically removed items) starting Sept. 15, 2026, affecting prices, sourcing, and customs classification.