Canada began imposing a new round of retaliatory tariffs on U.S. goods on Sept. 8, answering Washington's 50% duties on $27.6 billion worth of Canadian products — and supply chain analysts say shippers and retailers should expect higher prices, thinner brand assortments and longer waits rather than empty shelves.

The escalation followed a failed attempt to sign a new trade deal in August. The sequence was tight: the U.S. raised tariffs, Canada countered, and Washington then imposed outright bans on select Canadian imports including some alcoholic drinks, dairy byproducts, molasses and motorcycles. Canada had already applied 50% levies on those same categories in its August retaliation.

Ottawa's counter-tariffs run at 15%, 25% and 50% and deliberately target products where Canadian alternatives exist.

The covered categories include:

• Steel and aluminum
• Dairy
• Appliances
• Agricultural equipment
• Pulp and paper
• Plastics and electronics
• U.S. automobiles (tariffs still in place)

Both finished goods and components used to make other products are in scope.

What does the escalation mean for availability?

"Most goods should remain available, although some brands, models or specifications may disappear from the market," said Xiaodon Pan, associate professor of supply chain and business technology management at Concordia University in Montreal.

Matt Poirier of the Retail Council of Canada said retailers began front-loading inventory as soon as the trade deal collapsed in August. Those stockpiles should hold prices down for at least a couple of months.

"They've been working overtime to find either alternate sources of supply, domestic or global," Poirier said. "But it does take a while for those supply chains to reroute."

The crunch comes when inventories run down at the end of the year. Fraser Johnson, a professor at Ivey Business School at Western University, said retailers will avoid shocking consumers in the short term, but "in the medium to long term, prices are going up."

Where will costs bite first?

A 25% surtax now applies to U.S. refrigerators, freezers, cooking ranges, washers, dryers and dishwasher parts. American brands — Maytag, GE, Frigidaire and high-end Wolf stoves — hold a significant share of the North American appliance market.

South Korean and Chinese alternatives are readily available, but Johnson warns their prices will rise too as retailers recoup lost costs on U.S. models.

Aftermarket parts pose a sharper problem. "A specific control board, pump, sensor or repair component may have very few direct alternatives," Pan said. She extended that warning to electronics and furniture.

Construction materials are the most exposed category for outright shortages. Canada imports bulky goods — metal, plastic and foam building materials, paints, coatings, adhesives, cement products and prefabricated wood — that the shared border makes cheap to move.

Saibal Ray, James McGill Chair professor of supply chain management at McGill University, flagged car parts as another shortage risk given the steel and aluminum levies, because "availability might be an issue."

Johnson's advice to buyers: "If you're thinking about making a major purchase; if you're going through a home renovation — buying and locking in your prices earlier rather than later makes a lot of sense."

Cross-border inputs compound the cost pressure. Canada produces much of the aluminum for beverage cans, but the manufacturing is often completed in the U.S. "Because those capabilities take time to replace, tariffs can raise costs long before the underlying interdependence changes," Pan said.

Deloitte has lowered its Canada growth forecast for next year by 20% in response to the trade war's drag.

Is there any upside for Canadian suppliers?

Food may offer one. Produce is largely untouched by the latest tariff rounds, and Ottawa structured its retaliation to avoid surtaxing goods unavailable from domestic producers.

Gary Sands, senior vice president of policy and advocacy at the Canadian Federation of Independent Grocers, expects Canadian providers to replace U.S. goods without difficulty.

"There's a silver lining to this," Sands said. CFIG members have already recorded a roughly 20% rise in consumers purchasing Canadian products.

"I've been here for 26 years. I've never seen anything like this. It's definitely a permanent shift," he said.

Johnson noted that business-to-business costs rise before consumer prices, making the timing of pass-through hard to predict given the volatility of the dispute — and that the uncertainty itself is what hurts small and medium-sized Canadian businesses most.

"Eventually, all trade wars end," Johnson said. "I don't know when, but I do know that at some point this is going to get resolved and we'll be able to … get on with our lives."

With no talks scheduled and both sides dug in, shippers and forwarders should plan for inventory drawdowns, rerouted sourcing and price adjustments landing in the final weeks of the year.