Section 338 Tariffs on Canada: A USMCA Claim Won't Exempt You

Key takeaways

• A 50 percent duty lands on a list of Canadian goods on August 19, 2026 — 12:01 a.m. eastern time, for goods "entered for consumption, or withdrawn from warehouse for consumption," under three proclamations signed July 20 and published in the Federal Register on July 23.
• A USMCA/CUSMA origin claim does not exempt you from this one. That is the reversal, and it is written into the tariff schedule rather than left to inference. The new HTSUS note says products "eligible for special tariff treatment under general note 3(c)(i)" — the note that lists the United States-Mexico-Canada Agreement — "shall be subject to the additional ad valorem rate of duty imposed by this heading." The White House said it in plainer words the same day: these tariffs "apply to all covered goods regardless of whether a good originates under the U.S.-Mexico-Canada Agreement (USMCA)."
• No annex stops at the industry in its title — and one of them contains none of it. The alcohol and dairy annexes do tax alcohol and dairy, then keep going into unrelated retaliation targets (hockey equipment, wooden tableware, coated paperboard). The motor vehicles annex is the reverse: trade counsel report it omits vehicles and auto parts entirely — because those are already covered by Section 232 — and instead reaches several hundred nonautomotive lines including cosmetics, textiles and apparel, jewelry, machinery, and fine art. Reading the title to decide whether you're affected fails in both directions.
• It stacks. Other applicable duties still apply on top. The clearest carve-out written into the text is Section 232: the duties "shall not apply to articles subject to duties pursuant to section 232," plus civil-aircraft goods other than drones.
• There is no expiry clock on it. Unlike the Section 122 surcharge that just sunset on July 24, the HTSUS changes "shall continue in effect, unless this action is expressly reduced, modified, or terminated." The 30 days before it bites is a negotiating window, not a countdown to relief.

The short version: a duty your origin paperwork does not turn off

If you import anything from Canada into the US, the useful sentence is this one: the shield most cross-border founders have been told to rely on — a properly made claim of USMCA/CUSMA origin — does not work against this measure.

That is not how the last three years of tariff actions have gone. The Section 122 surcharge exempted articles "entered free of duty as a good of Canada or Mexico under the terms of general note 11" of the HTSUS — origin was the hinge the exemption turned on. The through-line of nearly every practical guide, including our brief on the Section 122 sunset, has been: don't chase the rate, get your origin claim right, because that is what the carve-outs are written around.

These proclamations break that pattern, and they do it explicitly. They were issued under Section 338 of the Tariff Act of 1930 (19 U.S.C. 1338) — a provision trade counsel describe as never having been used to impose tariffs before. The annexes insert a new U.S. note 51 into chapter 99 of the tariff schedule, and that note states that products "eligible for special tariff treatment under general note 3(c)(i) to the tariff schedule, or that are eligible for temporary duty exemptions or reductions under subchapter II to chapter 99, shall be subject to the additional ad valorem rate of duty imposed by this heading." General note 3(c)(i) is the schedule's roster of preference programs, and the United States-Mexico-Canada Agreement sits on it. So the tariff does not merely fail to exempt USMCA goods — it names the category they belong to and taxes it.

The contrast with the measure that just expired is exact. The Section 122 proclamation ran a list of exceptions to its surcharge, and item (l) on that list was "articles that are entered free of duty as a good of Canada or Mexico under the terms of general note 11 to the Harmonized Tariff Schedule of the United States (HTSUS)." Note 51's exception list — Section 232 goods, civil aircraft, personal-use baggage, most chapter 98 entries — contains no equivalent. One document was written with a USMCA exception and the other without.

There is a genuine irony in the mechanism. The dairy proclamation's stated grievance is that Canada's cheese tariff-rate quota rules let retailers use the quota opened under the Canada-EU agreement but not the one opened under USMCA — a USMCA-specific complaint. The remedy chosen taxes goods without regard to USMCA origin.

What each proclamation targets — and what it actually taxes

Each proclamation is named for a Canadian practice the US says it is offsetting. What each one taxes is a separate list in its Annex II. Sometimes those overlap and sometimes they don't — which is why the title is useless as a screening tool in either direction.

Read that middle row twice, because the titles fail in both directions. If you're in dairy or alcohol, the title understates your exposure — those annexes tax your industry and then keep going into goods that have nothing to do with it. If you're in none of the three, the title overstates your safety: the motor vehicles annex contains no passenger vehicles or auto parts at all — those already carry Section 232 duties, which this action excludes — and reaches cosmetics, apparel, and jewelry instead. It is also by far the longest of the three lists. Section 338 is a retaliation statute: the title tells you why the US is acting, and the annex tells you what pays for it.

Those numbers are ours, not a summary's. The Federal Register prints the annexes as page images, which is why most coverage describes them second-hand — but the White House posts all six as text, so the lists can be counted directly. Doing that puts 52 tariff lines in the dairy annex (28 of them in chapter 4 — milk, cream, whey), 63 in the alcohol annex (49 in chapter 22), and 440 in the motor vehicles annex, whose entire chapter 87 presence is a single line for motorcycles. It also explains why summaries disagree: one trade firm describes the action as taxing "automobiles, alcoholic beverages, and dairy from Canada," which is what the titles say and not what the lists do.

One limit that survives all of that, and it comes from the annexes themselves: "The product descriptions that are contained in this Annex are provided for informational purposes only and are not intended to delimit in any way the scope of the action." The government is telling you the same thing this brief is. Treat every category named here as a prompt to look up your own HTS lines, not as a finding about them — the tariff lines govern, and the annex adds that scope questions "should be referred to U.S. Customs and Border Protection."

Who this affects

• Anyone importing physical goods of Canadian origin into the US. That is the whole population at risk, and — the point of the section above — your industry is not a reliable filter. Cosmetics, apparel, furniture, jewelry, and machinery importers are inside a measure named for dairy and cars, while dairy and alcohol importers are inside it and exposed to lines well outside their own category.
• Cross-border sellers who cleared goods duty-free on a CUSMA claim. Your claim was probably correct and is still worth maintaining for other duties. It will not zero out this one.
• US founders sourcing inputs or finished goods from Canadian suppliers. Landed cost on covered lines changes on August 19 whether or not your supplier is USMCA-compliant.
• Anyone holding covered goods in a bonded warehouse or foreign trade zone. The trigger is withdrawal for consumption, not arrival. Covered goods admitted to an FTZ on or after the effective date — except those eligible for admission under "domestic status" under 19 CFR 146.43 — "must be admitted as 'privileged foreign status'," which locks in the tariff treatment at admission.
• Less affected: if you already pay Section 232 duties on a good, this does not stack onto it — trade counsel list steel and aluminum derivatives, passenger vehicles and light trucks and their parts, wood products, semiconductor articles, and patented pharmaceutical articles as excluded on that basis. Energy, potash, fish, and critical minerals are reported to sit outside, as do civil-aircraft goods other than drones, goods for personal use in a traveller's accompanied baggage, and most Chapter 98 entries. And if you sell services across the border, nothing here clears customs.

What to do now

1. Pull your HTS codes and check them against the annexes — before you conclude you're out. The single most expensive mistake available this month is reading "dairy" or "motor vehicles" in a headline and closing the tab. Your customs broker can run your top lines against all three annexes in one pass. Ask for that in writing.

2. Work out what "entered for consumption" means for your shipments in transit — because there is no grace period for them. The duty attaches to goods entered, or withdrawn from warehouse, on or after 12:01 a.m. eastern on August 19. Goods that clear before then do not carry it. What the proclamations and their annexes do not contain is an on-the-water exception: we searched all three texts and all six annexes for one and found none. That is a departure worth noticing. The Section 301 forced-labor action finalized this month did the opposite: its duties apply from "12:01 a.m. eastern time on July 24, 2026," but goods "loaded onto a vessel at the port of loading and in transit on the final mode of transit" before that moment escape the duty if they enter by July 28. Here, cargo sitting on a ship on August 18 gets nothing. If you have inventory that can reasonably land and clear earlier, that decision has a deadline attached, and it is three weeks out.

3. Don't abandon your CUSMA claim. It doesn't help against this measure; it still helps against others, and it is not something you can reconstruct in a hurry when a verification letter arrives. Keep certifying origin correctly.

4. Run the exclusion list, not just Section 232. If a good carries Section 232 duties, this action excludes it — that is why the vehicle list has no vehicles, and it is worth confirming per line rather than assuming. But it is not the only exclusion. The new note also exempts civil-aircraft articles meeting General Note 6 (unmanned aircraft excepted), "products for personal use included in accompanied baggage of persons arriving in the United States," and goods "for which entry is properly claimed under a provision of chapter 98" — the repair, alteration, and US-content provisions — with specified exceptions of its own. If you use chapter 98 entries, that is worth a conversation with your broker this week.

5. Watch for CBP guidance before August 19. The three actions sit under new chapter 99 subheadings 9903.03.12 (alcohol), 9903.03.13 (dairy), and 9903.03.14 (the motor-vehicle list), with 9903.03.15 and 9903.03.16 carrying the Section 232 and civil-aircraft exclusions. A practical wrinkle: because the duty has not taken effect, those subheadings and U.S. note 51 are not yet in the current published edition of the tariff schedule — they arrive with the action. The proclamations direct Customs and Border Protection to issue implementing instructions and to make any further HTSUS modifications by Federal Register notice, so take the operative numbers from CBP's own notice rather than from any summary, including this one.

6. Treat the 30 days as a negotiation window, not a promise. Section 338 requires that duties "not take effect earlier than 30 days after the President's proclamation," which is exactly the gap you're looking at — July 20 to August 19. It exists because the statute requires it. Plan for the duty to arrive; treat a negotiated withdrawal as upside.

This is general information about a trade and customs change for founders, not legal, tax, or customs advice — confirm the specifics for your goods with US Customs and Border Protection or a licensed customs broker before you rely on it.

The other thing that moved this week

While this was being signed, the tariff underneath it changed too. The Section 122 balance-of-payments surcharge expired on schedule on July 24, 2026, and the Section 301 forced-labor action that had been sitting in proposal form became final action the same week — with rates set by economy and a list of product exemptions. Canada sits in the 10 percent group. We keep the rate structure and the exemption categories in our Section 122 handover brief, now updated for the final action, rather than re-covering them here.

So within a single week, one authority sunset, a second was finalized, and a third — a 1930 statute that trade counsel describe as never having been used for this purpose before — was invoked three times over. If you are trying to hold a landed-cost model together, the lesson is not about any one of them. It is that the number of independent tariff authorities that can reach the same shipment has been going up, and they do not share exemptions. An origin claim answers some of them. None of them was built around your assumptions.

What this changes about "get your origin claim right"

We have been telling founders that the durable move is documentation, not rate-watching — that the thing which survives sunsets and appeals is being able to prove where a good was made. That advice was correct for the measures it was written about, and we would give it again for those.

What Section 338 adds is a boundary: origin documentation is a defense against duties that are structured around origin. A retaliation statute aimed at a country's conduct does not have to be structured that way, and this one is not. The correct version of the rule is narrower than the one in circulation — keep the paperwork, and stop assuming it is a general-purpose shield.

That is also why "which country is my business from?" keeps being the wrong question at customs. It was never your incorporation that qualified goods for CUSMA treatment; it was a claim about the goods — and CUSMA itself remains in force, a separate question we cover in whether CUSMA is still in effect. Here, even a good claim isn't enough. What remains true is the layer underneath: when a duty rate changes on three weeks' notice, the businesses that adjust fastest are the ones whose records — customs, tax, banking, platform — already agree with each other.

The setup layer: a business identity your customs records agree on

When your cost structure moves this fast, the practical constraint is rarely the tariff table. It is how quickly you can act on it: whether your broker can reach you, whether a CBP notice lands somewhere you're watching, whether the entity on your entry summary matches the one on your tax and banking records.

Every one of those records carries an address, and customs and tax systems cross-check them. When they all point at the same commercial street address, a query about a held shipment reaches you while you can still do something about it. When they diverge — a home address on one, an old address on another — the notice arrives late and the goods sit. We lay out which address belongs on each record in the import-export business address guide, and who actually receives a refund when duties are unwound in who gets the tariff refund.

That stable business identity is what Auteur is built to provide, on a North American footing — to be clear, it is not a customs address and it does not make you an importer of record. In Canada, that's a Toronto or Vancouver address of our own (mail-first, in pre-launch — you can reserve early). In the US, it's an address through our partner save office, which runs that side. If your flow also touches marketplaces, where the customs identity and the shop identity have to match, that side is in Etsy's DDP rule for cross-border sellers.

FAQ

What is a Section 338 tariff? Section 338 of the Tariff Act of 1930 (19 U.S.C. 1338) lets the President impose additional duties on a country's goods to offset another country's discrimination against US commerce. The statute caps them at "not to exceed 50 per centum ad valorem or its equivalent," and provides that they apply "thirty days after the date of such proclamation." As the proclamations themselves put it, section 338 authorizes "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." Trade counsel describe the July 20, 2026 proclamations as the first time the statute has been used to impose tariffs.

When do the Section 338 tariffs on Canada take effect? 12:01 a.m. eastern time on August 19, 2026, for goods entered for consumption, or withdrawn from warehouse for consumption, on or after that moment. The proclamations were signed July 20, 2026 and published in the Federal Register on July 23, 2026.

Is the rate 50 percent, or is that just the ceiling? Both, here. Fifty percent is the statutory maximum in Section 338, and the proclamations impose "an additional ad valorem duty of 50 percent" — the cap and the applied rate are the same number in this action. That is unusual enough to state plainly, because in the Section 122 action the widely quoted 15 percent was only the ceiling while the applied rate was 10.

Does USMCA or CUSMA exempt my goods? No, and the tariff schedule says so directly. The new U.S. note 51 provides that products "eligible for special tariff treatment under general note 3(c)(i)" — the general note that lists the USMCA — "shall be subject to the additional ad valorem rate of duty imposed by this heading." The White House fact sheet says the same in plain language: the tariffs "apply to all covered goods regardless of whether a good originates under the U.S.-Mexico-Canada Agreement (USMCA)." Keep your origin claim current for other duties; it simply does not switch this one off.

My products have nothing to do with dairy, alcohol, or cars. Am I clear? Not on that basis. The proclamation titles describe the Canadian practices being offset; the goods being taxed are listed separately in each Annex II, and the two only partly overlap. The alcohol and dairy annexes do cover those industries — and then extend to unrelated lines such as wooden tableware, coated paperboard, and hockey equipment. The motor vehicles annex is reported to contain no vehicles or auto parts at all (they already carry Section 232 duties, which this action excludes) and to reach several hundred nonautomotive lines including cosmetics, textiles and apparel, jewelry, machinery, and fine art. Check your HTS codes against all three annexes.

Does this stack with the other tariffs I already pay? Yes. Trade counsel state it "will also stack on top of any other applicable duties," and the new note confirms that covered goods "shall also be subject to the general rates of duty imposed under subheadings in chapters 1 to 97 of the tariff schedule." The exclusions run the other way: the proclamations exclude articles already subject to Section 232 duties and civil-aircraft articles other than unmanned aircraft, and the White House states the tariffs "will not apply to energy, potash, products subject to tariffs under Section 232, and certain other goods, such as fish or critical minerals."

When does it expire? There is no expiry date. The HTSUS modifications "shall continue in effect, unless this action is expressly reduced, modified, or terminated." Section 338 also authorizes the President to "suspend, revoke, supplement, or amend any proclamation under section 338 whenever the President deems that the public interests require such action" — which cuts both ways.

Bottom line

Three proclamations signed on July 20, 2026 put an additional 50 percent duty on a list of Canadian goods starting 12:01 a.m. eastern on August 19. Two things about it break the pattern founders have learned. A USMCA/CUSMA origin claim does not exempt the goods — not as an oversight but in writing, with the new tariff-schedule note taxing the very preference category the USMCA belongs to. And the titles are not the product list: these are proclamations issued under a retaliation statute and named for the Canadian practice being punished, so the alcohol and dairy annexes reach past their own industries into hockey equipment and paperboard, while the 440-line motor vehicles annex reaches cosmetics, apparel, and jewelry and contains no passenger vehicles at all.

The action you can take in the next three weeks is small and specific: get your HTS lines checked against all three annexes, decide what can clear before the nineteenth — there is no on-the-water grace period — and take the subheading details from CBP's implementing notice rather than from a summary. The one that outlasts this cycle is duller. Duty authorities now arrive faster than anyone can restructure around them, and the businesses that move first are the ones whose customs, tax, and platform records already point at one settled address. Whichever side of the border you file on, set up the business address those records agree on — a Toronto or Vancouver address from Auteur, or a US address through our partner save office — so that when the next notice lands, it lands where you're looking.