A rarely-used US trade law provision called Section 338 is back in Canada-US tariff news. Here's what it means for Canadian importers and how to prepare.
If you import goods into Canada, you've probably gotten used to checking Canada-US tariff news the way you check the weather before a long drive. Since the US reopened its Section 338 conversation — an old, rarely used provision of the Tariff Act of 1930 that lets the US President impose additional duties on countries deemed to discriminate against American commerce — Canadian importers have had one more variable to plan around. It hasn't been formally invoked against Canada, but the threat alone is enough to ripple through freight contracts, supplier quotes, and landed cost calculations.
This isn't abstract policy chatter. A tariff threat changes buyer behaviour today, months before anything is signed. Suppliers hedge by quoting in wider ranges. Freight forwarders build in buffer time for potential customs delays. And Canadian brands sourcing from China, Vietnam, or elsewhere in Asia — often routing goods through US ports or using US-dollar-denominated contracts — start asking whether their supply chain is exposed to a rule most of them had never heard of a year ago.
Section 338 of the Tariff Act of 1930 is a dormant piece of US trade law that predates the World Trade Organization system. It allows the President to impose tariffs of up to 50% on goods from countries found to "discriminate" against US commerce, with room to escalate that further if the discrimination continues. It was largely shelved once the US joined the GATT and later the WTO, because those frameworks provided more structured dispute mechanisms.
Its reappearance in Canada-US tariff news reflects a broader pattern: trade authorities on both sides of the border are reaching for older, more flexible legal tools rather than relying solely on modern trade agreements. For Canadian importers, the practical takeaway isn't the legal history — it's that tariff exposure can now come from directions that weren't on anyone's risk register two years ago.
Even before a tariff is formally applied, threats like this create cost pressure in several concrete ways:
Freight and logistics repricing. Ocean and air carriers adjust surcharges when trade policy uncertainty rises, because they're pricing in the risk of rerouted volumes or customs holds. If your goods transit through or near US infrastructure, expect freight quotes to move even before any tariff takes effect.
Supplier price padding. Factories in China and Southeast Asia that export significant volume to the US will often build a buffer into quotes for all customers — including Canadian buyers — because production runs and raw material sourcing are shared across markets. Understanding your true landed cost becomes more important, not less, when supplier pricing gets less stable.
Currency and contract risk. Many Canadian importers pay in USD, which means tariff-driven currency volatility compounds on top of any direct duty exposure.
Customs scrutiny. When any tariff action is on the table, border agencies on both sides tend to tighten documentation checks. Getting your paperwork right — proper certificate of origin filings in particular — stops being a formality and becomes a genuine risk control.
Not every importer carries the same level of risk. Based on what we're seeing across Epic Sourcing Canada's client base, exposure tends to concentrate in a few patterns:
Brands that route Asian-sourced goods through US distribution hubs before final delivery into Canada face the most direct exposure, since those goods can get caught up in US-side tariff mechanics even if the ultimate destination is Canadian. Businesses in categories the US has flagged in past trade actions — electronics, steel and aluminum-adjacent products, EVs and EV components, solar equipment — are natural targets for any escalation. And importers who haven't yet reviewed their country-of-origin documentation are exposed simply because they won't be able to prove eligibility for preferential treatment if rules tighten quickly.
If you're unsure which category you fall into, it's worth running a straightforward audit of your supply chain: where every input is made, where it transits, and what documentation currently backs that up. This is precisely the kind of review a customs broker can help formalize, particularly if your product mix touches multiple tariff schedules.
Reacting to every headline isn't a strategy. But there are practical, low-regret steps worth taking regardless of how the Section 338 situation resolves.
Diversify your sourcing base. Relying on a single country or a single factory concentrates risk in exactly the way tariff threats exploit. Spreading production across two or three qualified suppliers — even if one remains primary — gives you room to shift volume if duties or delays hit one lane.
Tighten your documentation now, not later. Country-of-origin paperwork, commercial invoices, and supplier compliance records should already be audit-ready. Waiting until a tariff is announced to fix documentation gaps means absorbing weeks of delay exactly when you can least afford it.
Model your landed cost under a few scenarios. Build a simple model showing your cost per unit under current tariffs, a moderate Section 338 scenario, and a worst-case scenario. This turns an abstract policy risk into a number your finance team can actually plan around.
Negotiate flexibility into supplier contracts. Where possible, avoid locking into long fixed-price contracts denominated in USD without some tariff-adjustment or currency-hedging clause. Factories dealing with international buyers are generally used to these conversations.
Watch anti-dumping exposure too. Tariff threats rarely travel alone — they often coincide with heightened anti-dumping duty reviews in adjacent categories, so it's worth checking whether your product falls under any active or pending investigation.
Canadian importers have lived through tariff cycles before: softwood lumber disputes, steel and aluminum surtaxes, retaliatory measures during past trade disagreements. What's different this time is the speed at which threats move from obscure legal provisions to front-page Canada-US tariff news, and the breadth of product categories being pulled into the conversation. A decade ago, a business importing consumer electronics or home goods could reasonably ignore trade disputes centred on steel or lumber. That's no longer a safe assumption. Section 338, if it's ever invoked, is broad enough in scope that almost any imported category could theoretically be swept in, which is exactly why it's generating so much attention despite never having been used in the modern trade era.
This broader scope is the real reason importers outside the traditionally tariff-exposed sectors — apparel, home goods, general consumer products — are paying attention to a piece of 1930s trade law they'd never heard of before. It's not that anyone expects the worst-case 50% duty scenario to materialize tomorrow. It's that the mechanism exists, has legal precedent, and is apparently back on the table as a policy tool, which changes the risk calculus for anyone with meaningful trade exposure to the US-Canada corridor.
Rather than treating every piece of Canada-US tariff news as a fresh crisis, it's worth building a standing response plan once and revisiting it as the situation develops. A solid plan usually covers four things.
A supplier map with redundancy built in. Know, for every SKU, which supplier produces it, where that supplier is located, and who your backup would be if lead times or costs suddenly moved. If you can't answer that today for your top 20% of SKUs by revenue, that's the first gap to close.
A documentation baseline. Every active supplier relationship should have current certificates of origin, compliant commercial invoice templates, and any product-specific compliance paperwork on file — not scattered across email threads, but organized and retrievable within a day.
A cost-scenario model. As mentioned above, model your landed cost under current tariffs and at least one escalation scenario. This doesn't need to be complicated — a spreadsheet with your current per-unit cost, freight, duty rate, and a version with an added 10-25% duty layer is usually enough to see where the pain points are.
A communication plan with your suppliers. Factories that export heavily to North America are used to tariff conversations. Ask directly how they're planning to handle any US-side tariff action — whether they'd absorb cost, pass it through, or shift production — so you're not guessing when the news breaks.
None of this requires predicting the outcome of US trade policy correctly. It just requires not being caught flat-footed when the next piece of Canada-US tariff news lands.
It's tempting to treat tariff news as something for your customs broker or finance team to handle downstream. In practice, the businesses that come through periods like this with the least disruption are the ones who treat sourcing strategy and trade policy as the same conversation. That means involving whoever manages supplier relationships early, not after a tariff lands — because renegotiating terms, qualifying a backup factory, or restructuring a shipping route all take lead time measured in months, not days.
This is also where having a sourcing partner with on-the-ground visibility in your supplier countries pays off. Real-time intelligence on how factories are responding to tariff news — repricing, relocating production, or absorbing costs — is far more useful than reading the same headlines everyone else is reading.
Has Section 338 actually been applied against Canada?
Not formally, as of this writing. It remains a threat and a talking point in the broader Canada-US tariff conversation, but importers should treat it as a live risk to plan around rather than a certainty.
Will this affect goods sourced from China and shipped directly to Canada?
Direct Canada-bound shipments that never transit US infrastructure carry lower direct exposure, though supplier pricing can still shift if factories are adjusting quotes across all their export markets.
How quickly could a Section 338 tariff take effect if invoked?
Historically, provisions like this can move faster than standard trade remedy processes, which is exactly why documentation and sourcing flexibility need to be in place before an announcement, not after.
What's the single most useful thing I can do this month?
Get your country-of-origin and customs documentation fully audit-ready, and run a landed cost model under a moderate tariff-increase scenario so you know your real exposure in dollars.
Should I switch suppliers because of this news?
Not necessarily immediately, but qualifying a second supplier in a different country as a contingency is a reasonable, low-regret move regardless of how this specific situation plays out.
Epic Sourcing Canada helps Canadian businesses build supply chains that don't panic every time a new tariff headline breaks. From supplier diversification and landed cost modelling to documentation audits and on-the-ground factory relationships, we help you turn trade policy uncertainty into a plan instead of a scramble. Get in touch with our team to review your current exposure and build a sourcing strategy that holds up regardless of what happens next in the Canada-US tariff conversation.
