A 96‑Year‑Old Tariff Weapon Fired. Don’t Assume It Stops at Canada.
Dan Krouse Senior Advisor | Supply Chain | Global Operations
Back in late February…when almost no one was paying attention …I wrote that Section 338 of the Tariff Act of 1930 was the statute to watch.
At the time, it sounded academic. A dissenting justice had listed it as an alternative authority after IEEPA fell. I argued that if Section 122 expired and Section 301 hadn’t matured, 338 was the bridge…with a 50% ceiling and no expiration clock.
Here’s that February piece for context: “The Playbook a Dissenting Justice Wrote…And the Tariff Tool With Almost No Recourse.” https://www.linkedin.com/pulse/playbook-dissenting-justice-wroteand-tariff-tool-almost-dan-krouse-nwdtc/
Yesterday, that “theoretical” statute fired for the first time in ninety‑six years.
Fifty percent on a range of Canadian goods…autos, alcohol, dairy…effective in 30 days.
The obscure authorities. The provisions that sit in the tariff code for decades and never move.
Most of them never will.
Section 338 was one of those. Written into Smoot‑Hawley. Memorized for the broker exam. Never once used. A dead letter. A trivia answer.
Not anymore.
What Section 338 Actually Does
Most coverage stops at “50 percent.”
That’s only the first phase…..
Phase One
The President may impose up to 50% ad valorem duties on imports from a country he finds to be discriminating against U.S. commerce.
No formal investigative clock. No 150‑day expiration like Section 122. No congressional vote.
It moves fast because it was written to move fast.
Phase Two (Almost No One Is Mentioning This)
If the discrimination continues, the statute allows the President to prohibit those goods entirely.
Not a higher tariff. Not a quota. A closed border for covered products.
That escalation clause has never been tested in modern trade practice.
It now exists in live authority.
The Detail Importers Need to Sit With
That 50 percent does not land on Canada although the implications are significant…
It lands on the U.S. importer of record.
When rates were 5% or 10%, that reality felt absorbable. At 50%…especially if stacked on top of existing duties…the working capital shock becomes immediate.
This is no longer a modeling exercise. It’s an operational one.
Why Reach for a 1930 Relic?
Because IEEPA was struck down in February.
The administration needed:
- A statute explicitly referencing duties
- A defined numerical ceiling
- No short expiration window
- No midterm congressional vote
Section 338 checks those boxes.
In February, I wrote that the dissent didn’t kill tariff authority….it redirected it. Section 122 was the short bridge. Section 301 was the slow burn. Section 338 was the quiet ceiling sitting above both.
Now it’s active.
Canada Is Significant. China Is Strategic.
Canada may be the deployment.
China is the obvious escalation vector.
Why?
Because the factual record already exists:
- Section 301 findings on forced technology transfer and IP theft
- WTO findings regarding discriminatory rare earth export controls
- Ongoing subsidy and market access disputes
- Explicit retaliatory trade behavior
Section 338 requires the President to “find as a fact” that discrimination exists.
That evidentiary groundwork has already been built in other contexts.
If 338 holds legally against Canada, it becomes a template.
And unlike Section 122:
- There is no 150‑day sunset.
Unlike Section 301:
- There is no nine‑month investigation clock.
Unlike Section 232:
- It is not sector‑specific.
It is country‑specific and immediate.
The Second Phase Is the Strategic Lever
The tariff is pressure.
The prohibition authority is leverage.
If the behavior deemed discriminatory continues, the statute authorizes closing the border to those goods.
Think about that in the context of:
- Rare earth inputs
- EV components
- Advanced electronics
- Pharmaceutical precursors
- Defense supply chains
A 50% duty reshapes margins.
A prohibition reshapes sourcing architecture.
Those are entirely different risk profiles.
The Legal Timeline Doesn’t Help You
Yes, this will be litigated.
But litigation unfolds over years.
Tariffs collect in days.
If you are waiting for judicial clarity before adjusting exposure, you are operating on a slower clock than policy.
We saw that with IEEPA.
We are likely to see it again. This has a higher chance of making it all the way and the leverage will extend to other countries beyond Canada and China. Think of whats coming…USMCA….bi-lateral deals. It’s the ultimate elephant in the room and it’s out!
The Real Shift
For ninety‑six years, Section 338 sat unused because no administration wanted to test it.
That restraint has now been broken.
Once a dormant authority becomes normalized, it stops being historical trivia and becomes standing leverage.
In February, I wrote that July would not be the finish line…it would be the inflection point.
We are past inflection.
The 338 ceiling has been cracked.
The only question now is how widely it gets deployed.
Dan Krouse is a supply chain advisor at Supplychainalytics. He helps companies of all sizes on supply chain issues…This article reflects analysis of publicly available legal and trade information and does not constitute legal or financial advice.
