A New Tariff on Canada: What Importers Need to Know About Section 338

The White House just reached for a trade authority that has sat unused for nearly a century. On July 20, 2026, the administration signed three proclamations placing a 50% tariff on a wide range of Canadian goods under Section 338 of the Tariff Act of 1930. The tariffs take effect on August 19, 2026, giving importers a 30-day window to assess their exposure and plan accordingly.

If your business moves goods across the northern border, here's what changed and what you can do about it.

What Section 338 actually is

Section 338 lets the President of the United States impose duties of up to 50% on countries that "discriminate" against U.S. products. Unlike Section 301 or Section 232, it doesn't require a formal investigation first, the president needs only to find that another country has treated U.S. commerce unfairly, after which Customs and Border Protection (CBP) can collect the duties or seize the covered goods.

The provision has never been invoked before, making this the first real-world test of how it works in practice. It's drawn attention as a possible successor to tariffs previously issued under the International Emergency Economic Powers Act (IEEPA), since the legal rationale is similar, the president can adjust it quickly, and it carries no expiration date. That flexibility cuts both ways, though, to hold up legally, the government has to show a genuine barrier facing U.S. goods entering Canada, or evidence that Canada treats American products worse than everyone else's. Trade attorneys will have plenty to work with, so expect legal challenges.

The three proclamations

The administration split the action into three batches, each covering a different set of products. The key point across all three: none of these tariffs are waived for goods that qualify under the United States-Mexico-Canada Agreement (USMCA). USMCA-originating goods are not exempted, though other tariff measures may offer separate relief.

"Motor Vehicles" (HTS 9903.03.14). Despite the name, this proclamation doesn't tax cars. Its Annex I covers honey, plants, wood, lumber and plywood, textiles, some apparel, tools, consumer goods, furniture, and sporting goods. Everything on the list gets the 50% rate unless it's already subject to Section 232 duties. The existing USMCA carve-outs for autos and auto parts under Section 232 appear to remain in place, though the exact treatment of "subject to" goods may not be fully clear until CBP publishes guidance.

Dairy (HTS 9903.03.13). This one reads as fairly direct retaliation: milk, butter, cream, whey, and other milk derivatives, plus molasses. Hops made the list too, which reaches into beer production.

Alcoholic beverages (HTS 9903.03.12). Beer, wine, spirits, and bitters of Canadian origin all draw the 50% rate, and hockey skates are named specifically. Notably, this list preserves the usual exemptions, including Chapter 98 provisions, personal effects, and civil aircraft, which the "Motor Vehicles" list does not.

What's not covered

The tariffs leave several categories untouched. Energy, potash, fish, and critical minerals are excluded, as are goods already subject to Section 232 tariffs. If your Canadian sourcing sits mostly in those buckets, the direct impact may be limited. For importers of wine, spirits, dairy, lumber, furniture, and consumer goods, the exposure is real, and it lands in about a month.

What to do with your 30 days

A month is tight, but it's enough time to move deliberately rather than react. A few priorities are worth tackling now.

Start with classification. The difference between a 50% duty and no additional duty often comes down to the exact HTS code and whether a good is "subject to" an existing Section 232 measure. Getting that right, with documentation to back it up, is the foundation for everything else.

Map your exposure next. Pull your Canadian-origin volume by product and match it against the three annexes so you know which lanes and SKUs are affected and by how much. From there, you can weigh your options: adjusting sourcing, timing shipments ahead of August 19, or exploring duty mitigation programs where they apply.

Trade policy will keep moving, and Section 338 may not be the last new tool to come off the shelf. The importers who come through it in good shape will be the ones who understand their exposure early and build a plan they can adjust as the picture changes.

---

Not sure how these tariffs affect your bottom line? Novoinno's trade advisory team can help you map your specific exposure and build a plan around it, reach out to get started.