A new front in the Canada-U.S. trade fight opened at 12:01 a.m. Eastern time on September 15, 2026. Canadian-made all-terrain vehicles, golf carts and a much wider collection of goods entering the United States are now exposed to an additional 50% tariff under Section 338 of the U.S. Tariff Act of 1930. Unlike several other recent U.S. trade measures, qualifying under the Canada-U.S.-Mexico Agreement does not provide an escape route.
The change reaches well beyond recreational vehicles. Paper products, metals, furniture, mattresses, lamps, boats and other goods were added as Washington reshuffled its tariff list in response to Canadian retaliation. For exporters, importers and dealers, the issue is no longer simply whether a product is North American. The precise tariff classification and country of origin can now determine whether a shipment crosses the border with a dramatically larger tax bill.
The 50% Tariff Is Now in Force
The September 15 deadline is more than an announcement date. U.S. Customs and Border Protection instructed importers and customs brokers that the revised Section 338 duties apply to covered Canadian goods entered for consumption, or withdrawn from a bonded warehouse for consumption, beginning at 12:01 a.m. Eastern time. That means shipments arriving under the affected classifications now face the additional charge when they are formally entered into the American market.
The underlying tariff rate is 50% ad valorem, meaning the additional duty is calculated as a percentage of the product’s customs value. The administration did not create an entirely new tariff program this week; it expanded and rearranged measures first announced in July and activated in August. The September modification brings substantially more tariff classifications into the system while removing several others. CBP said its updated list includes 122 additional classifications covered by the September changes. For a business with goods sitting at a border terminal or in a warehouse, the timing therefore matters almost as much as the product itself.
CUSMA Compliance Does Not Provide a Shield
For Canadian exporters accustomed to treating CUSMA qualification as their first line of defence against tariffs, the Section 338 measures operate very differently. The White House explicitly states that the covered tariffs apply regardless of whether a product qualifies as originating under the U.S.-Mexico-Canada Agreement. Canada’s Trade Commissioner Service similarly warns exporters that the 50% Section 338 duties were imposed without an exemption for CUSMA-compliant goods.
That distinction matters because CUSMA compliance still has value elsewhere in the increasingly complicated U.S. tariff system. Canadian government guidance notes that qualifying goods continue to receive exemptions from certain other U.S. sectoral or general tariff measures. Section 338 effectively creates another layer: a Canadian product can satisfy North American rules of origin and still fall squarely inside this particular 50% tariff list. A manufacturer therefore cannot assume that Canadian content, regional sourcing or a valid CUSMA certification automatically produces a zero-duty entry. Customs classification has become just as important as origin, forcing exporters and U.S. buyers to examine individual tariff codes shipment by shipment.
ATVs and Golf Carts Have Been Pulled Into the Expanded List
The recreational-vehicle additions make the policy unusually tangible. The September proclamation adds HTSUS 8703.10.50, the classification for golf carts and similar motor vehicles. It also adds HTSUS 8703.21.01, covering certain spark-ignition vehicles with engine displacement of no more than 1,000 cubic centimetres. The White House specifically identified all-terrain vehicles among the newly targeted Canadian products when explaining the expanded action.
Those classifications help explain why the impact can spread beyond products consumers ordinarily associate with the conventional automobile business. Golf carts are used not only on golf courses but at resorts, industrial properties, campuses and retirement communities. ATVs serve recreational riders, farms, forestry operations and rural businesses. The September revision also reaches products such as furniture, mattresses, lamps, paper, aluminum items, steel structures and certain motorboats. At the same time, Washington removed some products—including rock salt and cement—from the 50% Section 338 scope. The result is a tariff regime that is being actively reshaped rather than applied as one broad, static tax on everything Canada sells.
A 50% Border Charge Can Transform the Dealer Math
The legal responsibility for paying a U.S. import duty normally falls on the importer of record, not on the foreign government. Canadian government guidance for businesses makes the same point: tariffs are collected from the importer, while contracts and Incoterms can determine how the commercial burden is ultimately shared between buyer and seller. With a 50% additional tariff, the numbers can become uncomfortable very quickly. A covered shipment with a customs value of US$10,000 could generate US$5,000 in additional Section 338 duty before considering other applicable charges.
That does not automatically mean the retail sticker price rises by exactly 50%. Importers can absorb part of the cost through margins, negotiate lower supplier prices, change sourcing or raise prices. Research on earlier U.S. tariff episodes nevertheless shows why assuming foreign producers simply pay the bill is misleading. Studies from the National Bureau of Economic Research have found that much of the burden from recent U.S. tariffs ultimately fell on American importers, wholesalers, retailers and consumers. For a discretionary purchase such as an ATV or golf cart, that creates a difficult choice: raise prices and risk weaker demand, or protect sales by accepting smaller margins.
Section 338 Has Become a Powerful Trade-War Tool
The legal mechanism behind the new duties is Section 338 of the Tariff Act of 1930. It allows a U.S. president, under specified circumstances, to impose additional duties of up to 50% when a foreign country is found to discriminate against American commerce. The Trump administration argues that Canadian treatment of U.S. motor vehicles, dairy products and alcoholic beverages meets that standard and has used Section 338 repeatedly during the current dispute.
The September proclamation also shows how flexible the mechanism can be once activated. The president may supplement, amend, suspend or revoke measures when the administration determines that doing so serves the public interest. That flexibility is why one set of products can be removed while another is added without rebuilding the entire tariff program from scratch. For Canadian businesses, the consequence is greater policy uncertainty. A company may comply fully with CUSMA and organize production around long-standing North American trade rules, yet still discover that a separate U.S. statute has placed its tariff classification on a 50% list. The commercial risk increasingly comes not only from where something is made, but from which trade authority Washington chooses to invoke.
Some Tariffs Can Stack on Top of One Another
Another complication arrives with the administration’s decision to allow Section 338 duties to coexist with certain Section 232 tariffs. The September motor-vehicle proclamation states that its Section 338 duties apply in addition to duties imposed under Section 232 of the Trade Expansion Act. Quebec’s government has likewise warned exporters that beginning September 15, goods covered simultaneously by Section 232 national-security tariffs and Section 338 measures can face cumulative duties.
That does not mean every Canadian ATV or golf cart automatically receives multiple 50% tariffs. Whether additional duties apply depends on the specific product, tariff classification, materials and other customs rules. But for Canadian companies selling a range of products into the United States, the possibility of stacking creates another layer of landed-cost uncertainty. A manufacturer may have to analyze not only the completed vehicle but also metals, components or adjacent product lines subject to separate measures. Customs brokers consequently become more important to day-to-day commercial decisions. A classification mistake that once produced a relatively modest duty difference can become far more consequential when one of the relevant tariff programs carries a 50% rate.
Canada Has Already Answered With Its Own Counter-Tariffs
Ottawa’s response was already underway before today’s U.S. expansion took effect. Canada introduced counter-tariffs on September 8 at rates of 15%, 25% and 50%, with the government saying the measures cover C$27.6 billion worth of imports from the United States. The targeted sectors include steel and aluminum, dairy, appliances, agricultural equipment, pulp and paper, plastics and electronics. Canada’s stated strategy is to match incoming U.S. Section 338 tariffs dollar for dollar while concentrating pressure on sectors affected by American measures.
The federal government has paired retaliation with business support. Ottawa announced C$7.5 billion in new and expanded assistance, including another C$1.5 billion for the Regional Tariff Response Initiative aimed at helping small and medium-sized businesses deal with liquidity and adjustment pressures. Prime Minister Mark Carney has also framed Canada’s longer-term response around reducing dependence on the American market and expanding trade elsewhere. For companies caught directly in the crossfire, however, diversification takes time. A dealer network, distributor relationship or manufacturing supply chain built around the world’s largest neighbouring market cannot necessarily be redirected simply because a tariff appears at midnight.
September 29 Is the Next Major Deadline
Today’s tariff expansion is not the final scheduled escalation. The Trump administration has separately ordered import bans on certain Canadian products beginning September 29. The motor-vehicle proclamation provides for specified Canadian goods to be excluded from the U.S. market entirely rather than merely subjected to the 50% duty. Other proclamations target categories including certain alcoholic beverages, dairy-related products and motorcycles. Until those bans take effect, covered goods that remain under the existing tariff structure can still face the 50% duty.
That two-stage timetable illustrates how quickly the dispute has moved from conventional tariff bargaining toward more restrictive measures. On September 15, businesses are dealing with expanded tariff classifications and higher landed costs. Two weeks later, some Canadian exporters will confront outright market-access restrictions. None of that guarantees the measures will remain unchanged indefinitely: Section 338 itself gives the administration authority to modify or suspend its actions, and negotiations could alter the trajectory. For Canadian ATV and golf-cart exporters, though, the immediate reality is already settled. CUSMA qualification alone no longer keeps a covered product out of Washington’s tariff net.
