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Section 338 Canada Tariffs 2026: 50 Percent, No USMCA Shield

July 20 2026 proclamations invoked Section 338 of the Tariff Act of 1930 to impose a 50 percent tariff on specified Canadian goods effective August 19 2026 (T-minus 26 days). USMCA carve-out does not apply. Product scope, exemptions, worked landed cost, and what importers should do before August 19.

Updated 2026-07-246 min read

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Section 338 Canada Tariffs 2026: 50 Percent, No USMCA Shield

On July 20 2026, three presidential proclamations invoked Section 338 of the Tariff Act of 1930 to impose a 50 percent surcharge on a specified list of Canadian-origin goods. Effective date is August 19 2026. The measures explicitly do not honor USMCA preferential treatment on the covered lines.

This is a materially different regime from what most importers have been modeling under Section 122, Section 232, or Section 301. This article covers what Section 338 is, what the July 20 proclamations do, product scope, exemptions, a worked landed cost example, and the pre-Aug-19 action items importers should be running now.

What Section 338 is

Section 338 (codified at 19 USC 1338) is a retaliatory tariff authority in the Tariff Act of 1930. It authorizes the President to impose additional duties on imports from countries whose acts, policies, or practices discriminate against US commerce. The statute predates the modern GATT and Section 301 architecture, and had been essentially dormant since the 1940s.

The July 20 2026 Canada proclamations are the first modern invocation. The administration cited what it characterized as Canadian discriminatory treatment of US exports across several categories. Legal commentary has flagged that the authority is broad in text, so downstream expansions to other trading partners are plausible.

What the July 20 proclamations do

Three separate proclamations, each targeting a distinct product cluster:

Motor vehicles and related parts.
Alcoholic beverages, wine, and dairy.
A broader annex including hockey sticks, cement, and additional cross-sectoral items.

Common features:

Rate: 50 percent additional ad valorem duty.
Effective date: August 19 2026, on entries filed on or after that date.
USMCA: No carve-out. Goods that qualify for USMCA preferential treatment are still hit at the full 50 percent on the Section 338 layer.
Origin: Canada. Non-Canadian-origin goods are not covered.

What is exempted

The proclamations explicitly carve out:

Energy (crude oil, natural gas, refined products in the specified subheadings)
Potash
Critical minerals
Fish
Goods already subject to Section 232 tariffs. This category covers aluminum, steel, copper derivatives, passenger vehicles, medium and heavy-duty vehicles, wood products (including softwood lumber), and semiconductors.

The Section 232 carve-out prevents stacking. Products already paying a 232 layer do not additionally pay 338.

Stacking behavior

The following stack analysis is based on the text of the July 20 proclamations and the current published state of related regimes.

Layer	Behavior on Section 338 covered Canadian goods
MFN	Stacks. Charged as normal on CIF value.
USMCA preference	No effect on Section 338 layer. USMCA still zeros out the MFN layer for qualifying goods, but Section 338 is added on top.
Section 122	Sunsets July 24 2026, four weeks before Section 338 effective date. No overlap.
Section 232	Exempted from Section 338. Products in aluminum, steel, copper derivatives, passenger vehicles, medium/heavy vehicles, wood products, semiconductors do not stack.
Section 301 (forced-labor proposed rule)	Early proposed action text excludes Canada from the 60-economy list. If final rule follows, no stacking on Canadian origin.
AD/CVD orders	Independent. Softwood lumber CVD/AD continues; Section 338 does not apply to softwood lumber (Section 232 wood products carve-out).
MPF + HMF	Standard, no changes.

Worked example: 100,000 USD wine shipment from Ontario

HTS 2204.21 (bottled wine).

Pre-August 19 landed cost:

CIF value: 100,000 USD
MFN duty: 22.4 cents per liter (specific duty, worked at ~600 USD on a mid-density SKU volume). USMCA claim zeros this out for qualifying Canadian-origin wine.
MPF: 485 USD (capped)
HMF: 125 USD (only if arriving by sea; 0 by truck)
Total pre-Aug-19: about 610 to 1,110 USD, essentially trivial.

Post-August 19 landed cost, same shipment:

CIF value: 100,000 USD
MFN duty: same as above, zeroed by USMCA
Section 338 layer: 50,000 USD (50 percent of CIF)
MPF + HMF: unchanged
Total post-Aug-19: about 50,610 to 51,110 USD

The Section 338 layer is the entire net delta. For a covered product, one shipment on Aug 18 costs almost nothing. The same shipment on Aug 19 costs an extra 50 percent of CIF.

Worked example: 500,000 USD motor vehicle shipment

Motor vehicles are Section 232 covered. Result: Section 338 does not apply. The existing Section 232 vehicle duty (25 percent as of 2026) is the operative layer.

USMCA-qualifying Canadian-origin passenger vehicles: continue to be subject to the Section 232 25 percent, plus MFN of 2.5 percent for cars and 25 percent for light trucks (which USMCA zeroes). No new Section 338 add.

The proclamation names motor vehicles in one of the three annexes, but the internal cross-reference to Section 232 exemption resolves the apparent overlap. Read the annex text carefully.

Worked example: 250,000 USD cement shipment

HTS 2523.29 (Portland cement).

Pre-Aug-19: MFN duty on Portland cement is generally 0 cents per metric ton (specific duty structure with de facto zero). USMCA-qualifying: zero.

Post-Aug-19: Section 338 layer at 50 percent adds 125,000 USD.

For a construction-timeline-sensitive Canadian cement importer, this is a hard cost the pre-Aug-19 quote does not reflect.

Pre-August 19 action items

If any of your Q3-Q4 POs source from Canada in a Section 338-listed category, run the following before the effective date:

Pull the annex HTS list from the proclamation text. Identify which of your inbound lines fall in scope.
Model the post-Aug-19 landed cost at the 50 percent add. USMCA is not the shield here.
Consider accelerating shipments to enter before Aug 19. Section 338 applies to entries filed on or after Aug 19, not to goods on the water. If you can enter Aug 18, the shipment escapes the 50 percent add.
For goods that cannot arrive pre-Aug-19: reprice with the customer. Passing through 50 percent as a "trade policy adjustment" line item is more defensible than absorbing.
Confirm with your customs broker that the annex read is correct. Ambiguities on the HTS boundary (for example, exact wine subheading vs sparkling wine subheading) can shift the outcome.
Track any preliminary injunction or Court of International Trade challenge. Section 338 is an untested authority in modern courts; a legal challenge is plausible and could result in a stay similar to what happened with Section 122.

Legal posture and outlook

Section 338 has not been litigated in the modern era. The Court of International Trade struck down the February 2026 Section 122 invocation on statutory grounds (imprecise "balance of payments" finding), before the Federal Circuit stayed the ruling on May 12 2026. A similar challenge to Section 338 is plausible, though the statutory triggers are different (discrimination vs balance of payments), and the retaliatory framing is closer to the statute's plain-text intent.

Canada retaliation is the other variable. Ottawa has historically responded to US Section 232 measures with proportional CUSMA-consistent counter-tariffs. Expect similar posture on Section 338.

Citations

Presidential Proclamations, July 20 2026 (three proclamations under Section 338 of the Tariff Act of 1930 targeting Canadian goods)
19 USC 1338, Section 338 Tariff Act of 1930
USMCA (19 USC Chapter 29) and preference implementation
HTSUS Chapter 22 (wine), Chapter 25 (cement), Chapter 87 (motor vehicles)

Frequently asked questions

What is Section 338?

Section 338 of the Tariff Act of 1930 (19 USC 1338) authorizes the President to impose additional duties on imports from countries that discriminate against US commerce. The authority had been essentially dormant since the 1940s. The July 20 2026 Canada proclamations are the first modern invocation.

When does the Section 338 Canada tariff take effect?

August 19 2026. Entries filed on or after that date on the specified Canadian products pay the 50 percent Section 338 surcharge on top of any other applicable duty. Entries filed before August 19 are not affected.

Does USMCA exempt my goods?

No. This is the sharp break from Section 122 and prior trade regime carve-outs. Goods that qualify for preferential treatment under USMCA are still subject to the Section 338 50 percent on the covered product lines. The rate is charged on top of the USMCA-preference duty (which is often zero, so the visible number is just the 50 percent addition).

Which Canadian products are covered?

The proclamations attach annexes with the specific HTS lines. Publicly identified categories include wine and alcoholic beverages, hockey sticks, cement, dairy products, motor vehicles, and additional cross-sectoral items. Full annex HTS lists are the definitive source. Importers should pull the annex before Aug 19 to verify their specific chapters.

Are there exemptions?

Yes. Energy, potash, critical minerals, fish, and goods already subject to Section 232 (aluminum, steel, copper derivatives, passenger vehicles, medium/heavy vehicles, wood products, and semiconductors) are exempted. The exemption prevents stacking with Section 232 layers already in place.

Does Section 338 stack on Section 232 or Section 122?

Section 232 exemption prevents stacking with any product already covered by 232. Section 122 sunsets July 24 2026 (before Section 338's Aug 19 effective date), so no S122 overlap. AD/CVD orders stack independently. Section 301 forced-labor rule, if finalized before Aug 19 on a Canadian-covered product, could stack on top of the 338 layer, though early text suggests forced-labor scope excludes Canada.

How much does a covered Canadian shipment cost after Aug 19?

For a 100,000 USD CIF shipment of a Section 338 covered product (say, Canadian wine at HTS 2204): base MFN 22.4 cents per liter (specific), USMCA claim brings that to zero, Section 338 layer adds 50,000 USD, plus MPF (~485 USD on formal entry, capped) and HMF where applicable. The 338 layer is the entire net delta versus pre-Aug-19 landed cost.

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