What are Section 338 tariffs?

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Donald Trump has relied on several different laws to establish new tariffs since returning to the Oval Office for round two. On July 20, 2026, he invoked Section 338 of the Tariff Act of 1930 to set a 50% tariff on certain Canadian goods. The Section 338 tariffs took effect on August 19, 2026. 

What are Section 338 tariffs? Read on to find out.

• Section 338 of the Tariff Act of 1930 (19 U.S.C. § 1338) authorizes the president to indefinitely impose duties of up to 50% on imports from a country that discriminates against U.S. commerce.
• On July 20, 2026, President Trump invoked Section 338 to impose a 50% tariff on a variety of Canadian products, including many alcohol and dairy products.
• The United States-Mexico-Canada Agreement (USMCA), which provides duty-free status for many goods flowing between Canada, Mexico, and the U.S., does not protect affected products from the Section 338 tariffs.

Section 338 of the Tariff Act of 1930 (19 U.S.C. § 1338) pertains to “discrimination by foreign countries.” It authorizes the president of the United States to impose new or additional duties on any country whenever he finds “as a fact” that such country directly or indirectly either:

1. Imposes “any unreasonable charge, exaction, regulation, or limitation which is not equally enforced upon the like articles of every foreign country,” or
2. Discriminates against U.S. commerce by placing “the commerce of the United States at a disadvantage compared with the commerce of any foreign country.”

Section 338 tariffs may not exceed 50% and shall take effect 30 days after the date of the proclamation.

The president has the authority to impose Section 338 tariffs on a whole country or on subdivisions of a country. The law also allows the president to entirely exclude certain articles from importation.

Unlike the tariffs that Trump previously implemented under the International Economic Emergency Powers Act (IEEPA) or Section 122, Section 338 tariffs have no fixed expiration or renewal date. They can last indefinitely.

The White House issued three proclamations to impose additional duties to offset Canadian discrimination against the commerce of the United States with respect to alcoholic beverages, dairy, and motor vehicles.

Effective August 19, 2026, a 50% Section 338 tariff applies to alcoholic beverages, dairy products, and a variety of other products — but not motor vehicles — imported from Canada.

Importantly, the Section 338 tariffs affect certain goods that would otherwise qualify for duty-free status under USMCA.

The presidential proclamations provide the following justifications.

“Canada unreasonably burdens and disadvantages U.S. alcoholic beverages but not alcoholic beverages of other countries.” The proclamation on alcoholic beverages explains that, starting in March 2025, “all Canadian provinces and territories halted the purchase, distribution, or retailing of U.S. alcoholic beverages.”

It’s true that Canadian provinces drastically limited or halted the purchase, distribution, or retailing of alcoholic beverages from the United States in early 2025. What the proclamation leaves out is that Canadian provinces took these steps only after Trump imposed new U.S. duties on many Canadian imports.

The alcoholic beverages subject to the Section 338 tariff are listed in Annex 1.

Canada maintains a tariff-rate quota (TRQ) on cheeses of all types under both the United States-Mexico-Canada Agreement (USMCA) and the Canada-European Union Comprehensive Economic and Trade Agreement (CETA). According to the proclamation on dairy, Canada’s dairy TRQ eligibility criteria for the USMCA and the CETA disfavor the commerce of the U.S.

Dairy farmers are said to be the most powerful political lobby in Canada. Only limited amounts of foreign dairy enter Canada duty free or subject to low tariff rates; tariff rates for many U.S. dairy products range from 200% to nearly 300%.

The proclamation on motor vehicles states that “Canada imposed a tariff system on only U.S. motor vehicles and treats the commerce of foreign countries more favorably than commerce of the United States with respect to motor vehicles.”

Curiously, the proclamation on motor vehicles sets a 50% tariff on certain cosmetics, essential oils, flowers and flower bulbs, and a wide array of other products — but not motor vehicles.

Canada has levied a 25% tariff on imports of U.S. motor vehicles that don’t qualify for duty-free treatment under USMCA since April 9, 2025. For U.S. motor vehicles that do qualify for USMCA, Canada set a 25% tariff on the value of all goods used in the production of the vehicle that don’t originate in Canada or Mexico (up to 85% of the total value of the vehicle). This was in response to new U.S. tariffs on Canadian automobiles and auto parts. Canada doesn’t impose this tariff scheme on motor vehicles imported from other countries.

Additionally, according to the White House proclamation, Canada maintains a TRQ on motor vehicles that qualify for duty-free status under USMCA, “to induce companies to invest in production in Canada.” Likewise, Trump has urged companies to relocate to the U.S. to avoid tariffs.

The Section 338 tariffs also apply to many products that are not alcoholic beverages, dairy, or motor vehicles. These include:

• Certain textile products
• Electronics such as computer monitors and smartphones
• Field-hockey and ice-hockey equipment
• Furniture
• Golf equipment
• Hats
• Lighting fixtures
• Select paper products, including paper bags and toilet paper
• Various wood products

See this White House Fact Sheet, Annex I, and Annex II for more details. Most of the affected products are listed only by Harmonized Tariff Schedule of the United States (HTSUS) codes, also called tariff codes.

Section 338 tariffs will not apply to several product categories, including:

• Critical minerals
• Energy products and potash
• Fish
• Goods subject to tariffs under Section 232 (e.g., aluminum, automobiles, copper, pharmaceuticals, and semiconductors)
• Certain civil aircraft and parts per the WTO Agreement on Trade in Civil Aircraft (unmanned aircraft, aka drones, are not excluded)

While the Section 338 tariffs won’t stack on products subject to Section 232 tariffs, they can stack on top of other duties, including the 10% Section 301 tariff imposed on Canada on July 24, 2026.

The new Section 338 tariffs apply to a wide variety of Canadian products, including many that are otherwise eligible for duty-free status under USMCA, and they stack on top of other tariffs (with the exception of Section 232 tariffs). Covered products are identified by the HTSUS codes in annexes in the proclamations listed above.

Companies weren’t given much time to determine whether the Section 338 tariffs affect them. The new duties were announced on July 20, 2026, and they took effect on August 19, 2026.

Adding to the compliance complexity, on September 8, 2026, President Trump issued five proclamations that amend the Section 338 tariffs effective September 15, 2026, and ban the import of certain products of Canada effective September 29, 2026. Read our blog on the US-Canada trade war and tariffs for more details.

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Section 338 of the Tariff Act of 1930 (also known as the Smoot-Hawley Tariff Act) authorizes the U.S. president to impose additional tariffs of up to 50% on goods from a foreign country found to discriminate against U.S. commerce relative to other countries.

The Section 338 tariffs on Canada took effect at 12:01 a.m. ET on August 19, 2026, 30 days after President Trump signed the proclamations instituting them. Modifications to the Section 338 tariffs take effect on September 15, 2026. And some products currently subject to Section 338 tariffs will be banned from importation into the U.S. starting September 29, 2026.

Three proclamations impose a 50% Section 338 tariff on certain alcoholic beverages, dairy products, and a variety of other products, including certain apparel, cement, cosmetics, fishing rods, flower bulbs, and paint. See the three proclamations (here, here, and here) for more specifics.

No. USMCA preferential treatment does not apply to Section 338 tariffs. Goods covered by the proclamations are subject to the full 50% duty regardless of USMCA qualification. This is one of the most consequential aspects of these tariffs for businesses that rely on USMCA origin status to manage duty costs.

Section 338 tariffs do not apply to critical minerals, energy products, fish, potash, or goods that are subject to Section 232 tariffs, such as aluminum, automobiles, copper, pharmaceuticals, semiconductors, and steel. Certain civil aircraft are also excluded.

Unlike some tariff acts, Section 338 carries no fixed expiration date. The tariffs remain in effect indefinitely until the president issues a new proclamation to modify, suspend, or terminate them.

Avalara Cross-Border solutions help businesses classify goods accurately, calculate duties in real time, and stay current as U.S. Customs and Border Protection (CBP) guidance evolves.

You may remember the Smoot-Hawley Tariff Act of 1930 from Ferris Bueller’s Day Off. In the famous “Anyone? Anyone?” scene, economics teacher Mr. Lorensax, attempts to engage disinterested students in a discussion about the tariffs.

This blog was updated on September 9, 2026, to reflect new developments.