Nine Lines Reopen, the 50% Wall Stays: Trump's Canada Rollback Is Priced by One Senate Race

On October 23 the White House signed a proclamation that rewrites the product list of the 50% Section 338 tariff on Canadian goods, leaving every rate in place. Nine categories of Canadian imports move out of the list on October 30 — plywood sheets, corrugated paper, some paper products, packing crates and boxes, plastic boxes and packing bags, refrigeration equipment, certain machinery, and seaweed and algae products — while certain valves, carpets and waste products move in. The practical effect is a carve-out, not a rollback: the 50% ceiling under Section 338 of the Tariff Act of 1930 and the separate Section 232 metals and lumber duties all stay standing. Autos, dairy, alcoholic beverages and aluminum were not on the list that changed.

Sen. Susan Collins took public credit for the exemptions, saying she had secured relief for products crucial to Maine's agricultural industries, including blueberry, potato, apple and seaweed producers. Her office described nine categories of relief, and she said she spoke with USTR's Jamieson Greer and Commerce Secretary Howard Lutnick about the toll on Maine families and growers. Her challenger, former state Senate president Troy Jackson, said she had enabled Trump's tariff policies. The White House insisted the action responded to Canada's discriminatory treatment of US commerce and to Canadian retaliation, and said it was replacing the removed products rather than simply removing them — the same swap mechanic used six weeks earlier.

The economics behind the carve-out are specific enough to reverse-engineer. The September exclusion list barred about US$1 billion of Canadian goods from US entry, roughly 0.3% of total US imports from Canada, and it hit precisely the politically toxic lines — alcohol, dairy, motorcycles, molasses. Maine's producers, by contrast, needed inputs, not access: specialized harvesting boxes for wild blueberries, crates for potatoes and apples, and refrigeration gear. The exclusions were chosen to lower the landed cost of goods Americans buy, not to reopen markets for anyone — which is why the carve-out helps importers and hurts their domestic competitors.

The carve-out opens a single direction of the chain. Canadian crates, boxes, corrugated board, plywood, refrigeration units and farm machinery enter the US duty-free from October 30, which lowers landed cost for US buyers — and simultaneously hands a price umbrella to Canadian producers of the same goods. Downstream of that, US exporters into Canada keep paying Canada's counter-tariffs on steel, cooking appliances and agricultural hand tools, while US beer, wine and spirits face provincial delistings: Canada's share of US wine exports fell from 36% in 2024 to 12% in 2025, and the US wine trade balance flipped from a $254 million surplus to a $90 million deficit. Canadian imports of US alcoholic beverages fell roughly US$581 million over the twelve months to February 2026.

That asymmetry is what investors should price. Relief now flows to importers of Canadian inputs, while the retaliation closing US exporters' shelf space in Canada is untouched. For the listed US producers on the receiving end — Louisiana-Pacific in structural panels, UFP Industries in industrial packaging, International Paper in containerboard, Whirlpool in refrigeration and Molson Coors in Canadian-brewed beer — the carve-out is a competitive event rather than a cost event. And because the same proclamation can rewrite the list again, it is a dated window rather than a structural repricing of North American trade.

The operating data show how wide that wedge has become. Molson Coors, which imports Canadian-brewed beer into the US while selling US-made brands into Canada, reported Q2 2026 gross margin of 34.3% against 40.0% a year earlier, with cost of goods sold per hectoliter up 12.1%. Ford, the cleanest read on the motor-vehicle line that did not reopen, posted a $1.33 billion net loss on $48.3 billion of Q2 2026 revenue. Kaiser Aluminum, the listed read on the metals wall, saw Q3 2026 gross margin compress to 7.2% from 13.5% in Q2 2026.

In the days-to-quarters window, the relief is real but narrow and reversible: from October 30, US buyers of Canadian crates, boxes, corrugated board, plywood, refrigeration units and machinery pay no Section 338 duty, and importers with contracts signed before the proclamation capture the saving. The lines that carry most of the volume — motor vehicles, dairy, alcoholic beverages and metals — still carry 50% or more, and Canada's counter-tariff list on US steel, appliances, agricultural equipment, pulp and paper and electronics is unchanged. Nothing in the action alters the bargaining arithmetic: the USMCA was not renewed on July 1, 2026 and now moves to annual reviews, so the tariff product list has become the standing venue for US-Canada negotiation.