A small transportation fee can look harmless on a single invoice. In the deeply integrated Canada–U.S. auto industry, however, the same component may move back and forth across the border repeatedly before reaching a finished vehicle. That makes the latest rise in freight and fuel surcharges more consequential than it might appear at first glance.
Transport companies across North America are adjusting charges as diesel and other fuel costs remain elevated, adding another layer of expense to manufacturers already navigating tariffs and trade uncertainty. The new pressure is not a special fee aimed specifically at Canadian auto parts. The concern is that broad transportation surcharges can be amplified by a production system built around repeated shipments, tight inventories and suppliers operating on narrow margins.
Why Six Border Crossings Change the Cost Equation
The extraordinary integration of the Canadian and American automotive industries is easiest to understand through one often-cited statistic: some auto parts can cross the Canada–U.S. border as many as six times before a finished vehicle reaches the customer. A component may begin as raw material in one country, undergo machining in the other, return for additional processing, move again for assembly and continue through additional production stages. What looks like international trade is often closer to a single continental factory whose production lines happen to be separated by a border.
That arrangement works efficiently when transportation is predictable and inexpensive. It becomes more vulnerable when the cost of each movement rises. Statistics Canada illustrated the problem using a historical example involving a $100 product containing $90 of intermediate inputs. An additional shipping cost of only 50 cents represented just 0.5% of the product’s total value, but it equalled 5% of the $10 in value actually added at that particular production stage. For a supplier working on a thin margin, relatively small logistics increases can therefore matter surprisingly quickly.
Fuel Surcharges Are Moving Faster Again
Transportation companies typically use fuel surcharges to pass changes in diesel, jet fuel or marine fuel costs through to customers. Those mechanisms have become increasingly important during the latest energy disruption. Reuters reported in late August that UPS’s fuel surcharge on common shipments had climbed to roughly 24.25%, compared with about 9% when average diesel cost $3.35 a gallon in August 2021. FedEx was charging about 23.75%. Union Pacific, meanwhile, collected $91.1 million more in fuel-surcharge revenue than it spent on fuel during the second quarter.
Canadian transportation networks are showing the same sensitivity to fuel prices. CN’s published U.S. intermodal fuel surcharge rises to 45.70% for the week beginning August 31, based on its established formula and diesel benchmark. It was 43.70% the previous week and 41.70% one week earlier. Those percentages should not be interpreted as a universal surcharge on every truckload of automotive components; different carriers and contracts use different formulas. They do show, however, how quickly fuel-linked transportation charges can move when energy markets are under pressure.
Windsor–Detroit Is Where the Exposure Becomes Visible
Few places demonstrate the importance of efficient transportation better than Windsor and Detroit. The corridor carries approximately 30% of Canada–U.S. trade that moves by truck, according to the Canada Border Services Agency, with more than $274 million in goods moving through the gateway on an average day. Components headed toward assembly plants in Ontario, Michigan and surrounding states form part of an enormous continuous flow of trucks that makes the border feel less like the edge of two economies and more like a junction inside one manufacturing network.
The opening of the Gordie Howe International Bridge in July 2026 added badly needed capacity and an alternative to the Ambassador Bridge and Windsor–Detroit Tunnel. That infrastructure can reduce the risk created by congestion or disruptions, but it does not eliminate transportation expenses. A truck still consumes diesel, requires a driver and carries costs for insurance, equipment and border compliance. When surcharges rise, manufacturers cannot simply avoid the expense by choosing another bridge. The physical crossing can become more efficient while the economic cost of moving the cargo continues to rise.
Tariffs and Freight Charges Can Hit Different Parts of the Same Supply Chain
Freight surcharges arrive at an especially difficult moment because Canadian automotive producers are already operating under significant trade pressure. More than 90% of Canadian-made vehicles and about 60% of Canadian-made auto parts are normally exported to the United States. Since April 2025, Canadian-made vehicles have faced a 25% U.S. tariff on their non-U.S. content, while U.S. content in qualifying vehicles has been treated differently under the continental trade rules.
The outlook became more uncertain again in August 2026. After Canada–U.S. negotiations broke down, President Donald Trump threatened to raise tariffs on Canadian cars, trucks and automotive parts to 50% beginning January 1, 2027. Those duties are separate from a carrier’s fuel surcharge: one is a government trade measure, while the other is part of the transportation bill. Yet manufacturers ultimately have to manage the combined economics of materials, tariffs, freight, border compliance, labour and financing. A component does not become cheaper to move merely because another part of its cost structure has already increased.
Smaller Canadian Suppliers Have Less Room to Absorb Another Increase
The biggest automakers have global purchasing departments, extensive financing capacity and some ability to negotiate transportation contracts. Smaller parts suppliers often have far less flexibility. Federal economic-development data show that more than 95% of Ontario automotive suppliers have fewer than 500 employees, yet those companies account for roughly 61% of the province’s automotive workforce. Ontario exported about $60 billion in autos and parts to the United States in 2025, representing roughly 96% of the province’s automotive exports.
That dependence matters when costs rise faster than contracts can be renegotiated. A supplier making stamped metal components, moulded plastics or precision-machined parts may have committed to a price months before a sudden jump in freight charges. Passing the entire increase to the automaker may not be possible immediately. Absorbing it instead reduces money available for wages, equipment, research or new production. Statistics Canada has separately estimated that more than three-quarters of Canadian automobile and light-duty vehicle manufacturing output and payroll employment in 2024 was tied to U.S. demand, illustrating how directly conditions south of the border can affect Canadian production communities.
Rebuilding the Supply Chain Is Much Harder Than Rerouting a Truck
Automotive production was designed around just-in-time logistics precisely because carrying huge inventories is expensive. Transport Canada has previously noted that some assembly operations keep only one or two days of parts on hand. That efficiency leaves little room for prolonged transportation disruptions and explains why a delayed shipment can quickly affect an assembly line. It also makes repeated freight movements difficult to eliminate without redesigning the production process itself.
Canada is already trying to reduce some of that vulnerability. Ottawa’s 2026 automotive strategy includes up to $3 billion from the Strategic Response Fund and up to $100 million from the Regional Tariff Response Initiative to support investment, adaptation and diversification. But changing where parts are produced requires factories, equipment, qualified workers, supplier certification and long-term contracts. Those changes take years rather than weeks. In the meantime, the same highly integrated production network continues operating. That means fuel surcharges that appear modest on one journey can become a much larger strategic issue when components repeatedly travel between Canadian and American plants before a vehicle finally rolls off the assembly line.
