Section 338 Canada Retaliatory Duties

Section 338 of the Tariff Act of 1930, codified at 19 U.S.C. § 1338, empowers the President to impose duties on the imports of a foreign country to offset the burden or disadvantage arising from that country's discrimination against, or unequal imposition on, the commerce of the United States. It sat effectively dormant for decades with no modern use — until July 20, 2026, when three proclamations were signed against Canada on a single day, published July 23 and effective at 12:01 a.m. eastern time on August 19, 2026.

The three actions are separate, and the distinction matters more than it might appear. Proclamation 11046 answers the provincial and territorial halt on purchasing, distributing and retailing US alcoholic beverages, which began in March 2025 and cut Canadian imports of US alcohol by roughly 81 percent — from approximately $718 million to approximately $137 million. Proclamation 11047 answers Canada's administration of its cheese tariff-rate quotas under the USMCA and under the Canada-European Union Comprehensive Economic and Trade Agreement; by making retailers ineligible to use the USMCA cheese TRQ, Canada discriminated against US goods. Proclamation 11048 answers the motor-vehicle grievance.

Each of the three imposes an additional 50 percent ad valorem duty — the full statutory cap — on its own annexed list of Canadian goods. The lists are different. This is the single most important thing to understand about Section 338, and the most common way to get it wrong: the proclamations are named for the Canadian practices they answer, not for the goods they tax. The Motor Vehicles proclamation does not tax motor vehicles. Its annex contains no passenger-vehicle or vehicle-parts line at all, because articles already subject to Section 232 duties are excluded from Section 338 entirely.

For importers, Section 338 introduces something genuinely new to this site's model: it is the first authority that a USMCA preference claim does not defeat. A qualifying Canadian wine shipment that paid nothing on August 18, 2026 owes 50 percent on August 19.

Section 338 of the Tariff Act of 1930 (19 U.S.C. § 1338) allows the President to respond to foreign discrimination against United States commerce "by specifying and declaring additional duties not to exceed 50 percent ad valorem (or its equivalent) and not to take effect earlier than 30 days after the President's proclamation." Both limits shaped what happened here: all three Canada proclamations use the full 50 percent cap, and all three take effect on the earliest date the statute permits.

The duties are implemented through three new HTSUS headings in subchapter III of chapter 99: 9903.03.12 for the alcoholic-beverage annex, 9903.03.13 for dairy, and 9903.03.14 for the motor-vehicle-grievance annex. A fourth heading, 9903.03.15, carries the exclusions and reads "No change" — goods falling within it pay no Section 338 duty. All four are governed by U.S. note 51, created by Annex II of Proclamation 11046 and amended by the other two.

U.S. note 51 does the legal work that makes Section 338 unusual. Subdivision (a) provides that products subject to the additional duty "shall also be subject to the general rates of duty imposed under subheadings in chapters 1 to 97" and to any additional duty provided for elsewhere in chapter 99 — establishing additivity to both MFN and Section 301. It then provides that products "eligible for special tariff treatment under general note 3(c)(i) to the tariff schedule", which is the route a USMCA claim takes, "shall be subject to the additional ad valorem rate of duty imposed by this heading". The Rates of Duty 1-Special subcolumn confirms it in plain text: "The duty provided in the applicable subheading + 50%", identical to the 1-General column.

There is no importer-facing exclusion process. Section 338 authorizes the President to suspend, revoke, supplement or amend the action, and the United States Trade Representative holds delegated approval authority under 19 U.S.C. 1338(h), but no petition mechanism of the kind familiar from Section 232 or Section 301 was created.

There is one Section 338 rate: an additional 50 percent ad valorem. It is the same across all three proclamations. There are no tiers, no country bands, no company-specific reductions, no tariff-rate quota, no de minimis threshold and no quota mechanic of any kind. An importer either has a good on one of the annexes or does not.

The duty applies to goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time on August 19, 2026. Goods entered before that moment are unaffected. Because entry timing rather than shipment or order date controls, importers with Canadian goods in transit in mid-August 2026 should confirm the exact entry date with their broker.

There is no sunset. The modifications continue in effect unless the action is expressly reduced, modified or terminated. This distinguishes Section 338 sharply from Section 122, whose 150-day statutory limit ran out on July 24, 2026 without further action.

Antidumping and countervailing duties are unaffected: products provided for in headings 9903.03.12 through 9903.03.16 "shall continue to be subject to antidumping, countervailing or other duties, taxes, fees, exactions and charges." Goods for personal use in accompanied baggage are outside the duty, as is most chapter 98 treatment, with the exception of goods entered under subchapter XXIII of chapter 98 and under subheadings 9802.00.40, 9802.00.50, 9802.00.60 and heading 9802.00.80. Goods admitted to a foreign trade zone on or after the effective date must be admitted in privileged foreign status.

This site prices Section 338 on wine and spirits only, and it is worth being explicit about why, because the gap between what the proclamations cover and what a calculator can responsibly price is unusually wide here.

Proclamation 11046's annex enumerates essentially the whole of HTS 2203 through 2208 — beer made from malt, wine of fresh grapes, vermouth, cider and other fermented beverages, undenatured ethyl alcohol for beverage purposes, and the full range of spirits including whiskies, rum, gin, vodka, tequila, brandy and liqueurs. That maps cleanly onto a product category this site already carries, so wine and spirits is priced. The same annex also reaches a non-alcohol tail — essential oils of grapefruit, certain wood articles, plaiting materials, paper and some sporting goods — which does not.

Dairy is genuinely in scope. Proclamation 11047's annex covers HTS 0402 milk and cream, concentrated, in powder, granules or other solid forms, tiered by fat content. This site carries no dairy product category, so it does not price the duty. That is a coverage gap, stated rather than hidden.

Motor vehicles and their parts are a different matter entirely: they are excluded by law, not omitted by choice. HTSUS U.S. note 51(c), implemented through heading 9903.03.15, lists as "No change" all articles of steel, aluminum and copper and their derivatives; passenger vehicles, sport utility vehicles, crossover utility vehicles, minivans, cargo vans and light trucks; parts of passenger vehicles and light trucks; wood products; medium- and heavy-duty vehicles and buses; medium- and heavy-duty vehicle parts; semiconductor articles; and patented pharmaceutical articles. Civil-aircraft articles meeting General Note 6, other than unmanned aircraft, are excluded under subdivision (d). A Canadian car pays its Section 232 duty and no Section 338 duty.

The Proclamation 11048 annex, in place of vehicles, reaches a broad and deliberately diffuse basket: natural honey, animal products, bulbs and cut flowers, textiles, glass, jewellery, hand tools, appliances and consumer electronics, vessels, furniture and lighting, toys and sporting goods, and fine art, antiques and collectors' pieces. Those are individual eight-digit lines spread across roughly 60 HTS chapters, which do not align with this site's whole-chapter product categories. Rather than imply per-category precision it does not have, the site makes no Section 338 claim beyond wine and spirits.

Section 338 is additive to everything. Clause 2 of each proclamation states that the duties "are in addition to any other duties, taxes, fees, exactions, and charges applicable to such products", and U.S. note 51(a) confirms it twice over: covered products remain subject to the general chapter 1 to 97 rates, and to any additional duty provided for in chapter 99 subchapter III or subchapter IV. So a Section 338 duty stacks on top of MFN and on top of Section 301, including the forced-labor Section 301 duty.

The current stacking formula is MFN + max(S122, S232, Bilateral) + China-punitive Section 301 + forced-labor Section 301 (if covered) + Section 338 (Canada only, on annexed non-S232 goods, from Aug 19 2026). Section 338 is a distinct additive term — it does not enter the max() comparison, and it does not replace any other layer.

The interaction that matters most is with USMCA. Every other authority this site models treats a USMCA-qualifying good as duty-free. Section 338 does not. U.S. note 51 expressly subjects goods eligible for special tariff treatment under general note 3(c)(i) to the additional duty, and the Rates of Duty 1-Special subcolumn reads "The duty provided in the applicable subheading + 50%". In practice a USMCA-qualifying Canadian wine shipment keeps its 0 percent preferential underlying rate and pays 0 + 50 = 50 percent. Temporary duty exemptions or reductions under chapter 99 subchapter II are treated the same way.

The interaction with Section 232 runs the other way and is absolute: Section 338 never applies to an article subject to Section 232 duties. That exclusion is stated in clause 2 of every proclamation and reinforced by the note 51(c) "No change" list. An importer never pays both on the same article, and should be suspicious of any calculation that shows them stacked.

Section 338 was enacted as part of the Tariff Act of 1930 — the same statute better known for the Smoot-Hawley schedule — and then went almost entirely unused. Through the post-war era the United States pursued discrimination complaints through the General Agreement on Tariffs and Trade and later the World Trade Organization, and later through Section 301 of the Trade Act of 1974, which had a defined investigative process. Section 338 required no investigation and had no procedural apparatus, which made it powerful and, for decades, politically unattractive.

That changed on July 20, 2026, when three Section 338 proclamations were signed on the same day, all directed at Canada. They were published in the Federal Register on July 23, 2026 at 91 FR 46639 (Proclamation 11046, alcoholic beverages), 91 FR 46653 (Proclamation 11047, dairy) and 91 FR 46663 (Proclamation 11048, motor vehicles), and take effect August 19, 2026 — the earliest date the statute's 30-day minimum lead permits.

The actions arrive in an already crowded year. Section 122's uniform global surcharge was enacted February 24, 2026 and lapsed by operation of its 150-day limit on July 24, 2026. A forced-labor Section 301 duty took effect the same day across roughly 60 economies. Section 232 expanded to commercial trucks in November 2025, semiconductors in January 2026 and patented pharmaceuticals in mid-2026.

Against that backdrop, Section 338 is the narrowest of the recent authorities by country coverage — one country — and the widest in one specific respect: it is the first to reach goods that a trade agreement had made duty-free.

Section 338 has no expiration date. The modifications continue in effect unless the action is expressly reduced, modified or terminated, and the statute lets the President suspend, revoke, supplement or amend at any time. Importers should treat the duty as open-ended rather than temporary, and should not plan around a lapse of the kind that ended Section 122.

The most likely path to change is diplomatic rather than legal. Each proclamation identifies a specific Canadian practice: provincial alcohol delisting, cheese tariff-rate quota administration, and the motor-vehicle grievance. If a practice is reversed, the proclamation answering it becomes the obvious candidate for withdrawal — though nothing in the text makes that automatic.

Litigation is possible but the statutory footing is unusually direct. Section 338 confers the authority in explicit terms, caps it at 50 percent and requires only the 30-day lead, all of which this action observed. That is a narrower target than the delegation questions that decided the IEEPA challenge in February 2026.

Importers of Canadian wine and spirits should model 50 percentage points of additional landed cost from August 19, 2026, including on shipments claiming USMCA preference. Importers of Canadian vehicles, vehicle parts, steel, aluminum, copper, wood products, semiconductors or patented pharmaceuticals should model no change at all — those articles are outside Section 338 by law. Importers of the diffuse chapter-by-chapter basket in the Proclamation 11048 annex should check their specific eight-digit classifications against the annex directly, because category-level generalisation is not reliable there.