Washington rewrites the product scope of its 50 percent Section 338 duties on Canada for the third time in three months, lifting plywood, corrugated boxes and farm packaging equipment out of the net while pulling in valves, carpets, vinyl flooring and municipal waste. The changes take effect October 30, four days before the United States midterm elections.
By the Canada Trade Desk | Peacock Tariff Consulting
OTTAWA, October 24, 2026 – Canadian exporters spent Friday doing what has become the signature chore of this trade war: reading an annex.
President Donald Trump signed a proclamation on October 23 that further modifies the list of Canadian products subject to additional duties under Section 338 of the Tariff Act of 1930, according to a fact sheet published the same day by the White House. The document describes the action as a refinement of earlier measures taken on July 20 and September 8, and says the changes take effect October 30, 2026.
The substance is a swap rather than a retreat. The White House fact sheet says the proclamation removes plywood sheets, some paper products, certain machinery and refrigeration equipment, and certain packing crates and boxes from the duty list. In their place it adds certain valves, carpets, waste products “and others.” A United States official told Transport Topics that the net tariff impact of the exchange is unchanged.
For Canadian shippers, that phrase is the whole story. The aggregate burden stays roughly where it was. The distribution of it moves, and it moves onto a different set of companies, plants and towns with seven days of notice.
What came off, and what went on
The relief list is narrow and specific. Based on the White House fact sheet and a statement from Senator Susan Collins of Maine reported by Transport Topics, the newly exempt categories include corrugated paper and boxes, some plastic packaging materials, refrigeration and freezing equipment, agricultural cleaning, sorting and grading machinery, certain packaging machinery, and seaweed and algae food products.
A more granular reading published by Hashtag Investing lists thin Canadian plywood including birch and walnut sheets, certain coated paper and paperboard, moulded or pressed articles of paper pulp, corrugated paperboard boxes, plastic crates and cases, plastic packing sacks, refrigeration and freezing equipment, machines for cleaning or sorting agricultural products, equipment for filling, sealing, labelling, packing and wrapping goods, and fresh and dried edible seaweed.
The additions are broader and stranger. The same account describes new coverage for sweetened cocoa powders, paints and varnishes, caulking compounds, shampoos, soaps, lubricating preparations, artificial waxes and certain laboratory reagents. It also lists vinyl flooring, selected wood and paper products, carpets and textile floor coverings, wooden coffins, wooden skewers and ice cream sticks, self contained window and wall air conditioners, chest freezers, some electric hand tools, iron and steel valves, canoes and archery equipment, certain electrosurgical instruments, demonstration equipment and spectrometers, and municipal waste, sewage sludge and clinical waste.
The Deep Dive, a Canadian financial publication, reported that nine product categories were exempted and that the replacement list runs to six pages. Its account names canoes shorter than 7.5 metres, window air conditioning units, archery equipment, shampoos and cocoa powder products among the goods newly captured.
Three observations follow from that inventory. The first is that the swap moves duty exposure out of forest products and food handling equipment and into chemicals, building materials, light manufacturing and recreational goods. The second is that several of the added lines are inputs rather than finished consumer goods, which means the cost will travel down a supply chain rather than stopping at a retail shelf. The third is that at least one addition, municipal and clinical waste, is not a trade in the ordinary commercial sense at all. Cross border waste movement between Ontario and Michigan and between Quebec and New York is a logistics arrangement built over decades. Putting a 50 percent duty on it is an unusual use of a trade statute.
A tariff authority with no brakes
The legal vehicle for all of this is Section 338 of the Tariff Act of 1930, codified at 19 U.S.C. 1338. It had never been used by a president before this year.
According to an analysis by the law firm Davis Wright Tremaine, Section 338 allows the president to proclaim additional duties of up to 50 percent to offset discrimination against United States commerce, with the duties taking effect no sooner than 30 days after proclamation. The firm notes that the statute appears to require no prior administrative investigation of the kind that governs Section 232 national security actions or Section 301 unfair practice cases. There is no petition, no comment docket, no International Trade Commission injury finding and no published economic analysis. There is a proclamation and an annex.
The initial measures were signed on July 20, 2026 as three proclamations covering alcoholic beverages, dairy products and motor vehicles, numbered 11046, 11047 and 11048. Proclamation 11056 pushed the start date back by three days. The 50 percent duties took effect at 12:01 a.m. Eastern on August 22, 2026, and covered roughly 554 eight digit tariff lines touching about 20 billion dollars of annual Canadian exports, Davis Wright Tremaine reported. Covered goods ranged from alcohol and maple syrup to plywood and ice hockey equipment.
Two features of the original design still shape every compliance decision Canadian exporters make. Goods that qualify under the Canada United States Mexico Agreement are not exempt. That is unusual. Most recent United States tariff actions have carved out CUSMA originating goods, and the practical effect of not doing so is that a certificate of origin, the single most valuable document in North American trade, buys nothing here. The second feature is that there is no in transit provision in the original proclamations, so goods on the water or on a rail car when a change lands are treated by the date rule rather than by the shipping date.
The duties also stack. Davis Wright Tremaine notes that United States Customs and Border Protection guidance confirmed the Section 338 duties are eligible for drawback, can be mitigated through Chapter 98 provisions in the Harmonized Tariff Schedule, and sit on top of Section 301 and other applicable duties. Goods already subject to Section 232 steel, aluminum or automotive tariffs were excluded from the Section 338 list, as were civil aircraft and parts.
The September escalation showed how far the authority can be pushed. Five further proclamations were signed on September 8. Scope changes effective September 15 added all terrain vehicles and additional dairy products to the 50 percent duty and removed rock salt and cement. Then, on September 29, certain Canadian alcoholic beverages, dairy products and motor vehicle products stopped being dutiable at all and became excluded from importation. Customs guidance issued September 28 instructed that entries containing covered products would be rejected rather than assessed. A 50 percent tariff is a price. An exclusion is a wall.
That history matters for reading the October 23 action correctly. The proclamation signed this week is the fifth or sixth adjustment to a framework barely three months old, and the White House fact sheet makes the discretion explicit, noting that Section 338 permits the president to suspend, revoke, supplement or amend any such proclamation whenever the public interest requires it. Canadian exporters are not dealing with a tariff schedule. They are dealing with a living document.
The Maine calculation
The timing is not subtle. October 30 falls four days before the November 3 midterm elections.
Senator Collins, a Republican who has represented Maine since 1997, took public credit for the exemptions. Transport Topics quoted her saying that “Many of our farmers and growers rely on specialized equipment, packaging materials and other products from Canada,” and reported that she framed the relief as help for Maine’s blueberry, potato, apple and seaweed industries. Hashtag Investing reported that her office pressed the case on behalf of growers who depend on specialized Canadian harvesting boxes, noting that a United States supplier of certain cardboard totes had stopped making them.
This is the second such intervention. Transport Topics reported that Collins secured an exemption for road salt and other products the previous month, at the same time new retaliatory measures were rolled out after talks with Ottawa collapsed.
Her opponents drew the obvious inference. Troy Jackson, the Democratic Senate candidate in Maine, wrote on X that Collins “wants credit for bringing a cup of water to put out the fire,” according to Transport Topics. Hashtag Investing reported that Democrats more broadly argue the administration manufactured the tariff costs and is now distributing selective relief close to Election Day.
Maine is not the only pressure point. Hashtag Investing reported that Michigan Republicans have raised concerns about the dispute, and that in Kansas a threatened action against Bombardier was politically sensitive because the company employs roughly 1,500 people in Wichita.
For Canadian firms, the political reading is practical rather than partisan. If relief is allocated by electoral geography, then the question of whether a given Canadian product stays dutiable depends partly on who buys it in the United States and which state they vote in. That is not a variable most export planners have a column for.
Ottawa plays for time
Canada’s response was deliberately flat. Trade Minister Dominic LeBlanc said the government remains ready to pursue a “mutually beneficial deal,” The Deep Dive reported, and Hashtag Investing reported that Ottawa is assessing the changes and remains prepared to work constructively.
The restraint reflects the state of play. Talks collapsed in August. Canada’s own countermeasures took effect September 8 under Section 53(2) of the Customs Tariff, covering 874 United States products at rates of 15, 25 and 50 percent, matched to the American measures in value and rate. Hashtag Investing put the covered value at C$27.6 billion. The target list runs through steel, aluminum, dairy, appliances, agricultural equipment, pulp and paper, plastics and electronics, and includes Kentucky bourbon. Seafood was pulled off the Canadian list shortly before it took effect, and the Canadian measures, unlike the American ones, include an in transit exemption.
Ottawa did not respond to the October 23 proclamation with a counter adjustment, and there is a reason for that. Canada’s tariff exposure to the United States is asymmetric by construction, and each round of matching retaliation raises Canadian input costs as much as it raises American ones. Prime Minister Mark Carney acknowledged the tradeoff bluntly earlier in the week, saying that tariffs “make both our industries weaker and reduce choice for our families,” as reported by Euronews.
The diplomatic weather has not helped. On October 21, the United States Embassy in Ottawa published a fact sheet accusing Canadian politicians of trying to influence the midterm elections, citing among other things remarks by Industry Minister Melanie Joly about targeting tariffs at particular states and an Ontario advertising campaign built around a Ronald Reagan speech, according to Axios. Joly rejected the characterisation, saying it was “absolutely not” fair to call Canada’s actions election interference. Carney, asked about the accusations, said “all of our actions are in the interest of Canadian workers, Canadian families and the future of this economy.”
Industry asks for the one thing on offer
The clearest Canadian industry reaction came from the forest products sector, which has been on and off the duty list repeatedly. Derek Nighbor of the Forest Products Association of Canada told The Deep Dive that the sector needs “stable, rules based trade, not constantly changing tariffs.”
That is the authentic complaint of this phase of the trade war, and it is not a rhetorical one. A 50 percent duty that is stable can be priced, hedged, contracted around and, in the worst case, absorbed by exiting the market in an orderly way. A 50 percent duty that migrates across tariff lines every few weeks cannot be any of those things. It converts a pricing problem into a classification problem, and classification problems are expensive precisely because they are invisible until a customs entry is filed.
Consider the plywood producer who lost market access in August, redirected volume to domestic and offshore buyers through September, and now finds the duty lifted on October 30. Rebuilding an American customer base that was handed to a competitor is not a seven day task. Meanwhile the carpet mill, the valve manufacturer and the specialty chemical blender that were outside the net this week are inside it next week, with contracts priced on the old assumption.
The courts enter the picture
The first serious legal challenge to the Section 338 framework arrived days before the latest proclamation. Hashtag Investing reported that on October 20, Gellert Global Group, a United States food importer, filed suit in the United States Court of International Trade challenging the use of Section 338 and seeking relief on behalf of a proposed class of importers. No ruling has been issued.
The case matters to Canadian exporters even though they are not the plaintiffs. Section 338 has no judicial track record. The statute has sat unused since 1930, which means there is no body of case law on what constitutes discrimination sufficient to trigger it, how much deference a court owes the presidential finding, or whether the exclusion power in subsections (b) and (c) can be exercised without process. Davis Wright Tremaine noted at the time of the original proclamations that no litigation had been filed. That is no longer true.
Trade counsel will advise clients not to plan around a favourable ruling. But importers of record on the American side, who bear the legal duty liability, now have a reason to preserve their rights through protests and to track the docket. Canadian suppliers negotiating price adjustment clauses should expect their American counterparties to raise it.
What the swap costs, and who pays
The macro numbers frame the stakes. Hashtag Investing reported two way United States and Canada goods trade of roughly US$715.5 billion in 2025, with United States imports from Canada at about US$381.9 billion. Statistics Canada data cited in the same report shows the United States took 71.7 percent of Canadian merchandise exports in 2025, down from 75.9 percent a year earlier.
That four point drop is the trade war’s clearest statistical fingerprint. It is also, from Ottawa’s perspective, the beginning of a strategy. Carney has set a target of doubling Canadian exports to non United States markets within a decade, Euronews reported, framing it with the line: “Their approach has changed. So must ours.”
Against those totals, the roughly US$20 billion of Canadian goods under Section 338 duties is about five percent of Canadian exports to the United States. That understates the damage. The affected lines are concentrated in sectors where Canadian producers hold narrow margins and where American buyers have substitutes, and a 50 percent duty is not a tax that gets split. At that level the trade usually stops.
The forward exposure is larger than the current list. The Rio Times reported that a 50 percent United States tariff on Canadian vehicles and parts has been threatened for January 1, 2027. Canadian auto exports to the United States have already fallen more than 10 percent, with American exports to Canada down more than 20 percent, according to Euronews.
The October 30 checklist
For importers, exporters and customs brokers, the next seven days carry concrete obligations.
Re screen the full product catalogue against the new annex at the eight digit level, not the product description level. The categories reported in the press are summaries. The annex governs, and in past rounds the annex has captured goods that did not obviously belong to the named category.
Do not rely on CUSMA origin. Section 338 duties apply regardless of preferential qualification. A supplier who assumes a certificate of origin provides cover will be wrong at the border.
Check the stacking position. Goods already caught by Section 232 are outside the Section 338 list, but that boundary has moved with each proclamation, and a good can be reclassified into either regime.
Plan for the date rule rather than the shipping date. The original proclamations contained no in transit provision. Goods arriving after the effective date on a pre effective date purchase order may be dutiable at the new rate.
Review drawback and Chapter 98 options. Customs guidance confirms Section 338 duties are drawback eligible, which matters for goods that re export.
Revisit contract language. Price adjustment, change in law and tariff allocation clauses written before July 2026 almost certainly do not contemplate a duty list that changes monthly in both directions.
Watch the exclusion power. The September 29 action showed that a 50 percent duty can become a prohibition on importation with limited notice. Any contingency plan that assumes duties remain duties is incomplete.
The pattern underneath
Strip away the product lists and a consistent logic appears. The administration is using a statute with almost no procedural constraints to run a continuously adjustable tariff, tuned at the margin for American domestic political cost and kept roughly constant in aggregate burden on Canada. Relief flows to constituencies that complain loudest in states that matter most. The offset is found wherever Canadian exposure is available and American substitution is plausible.
That design is efficient for the party operating it and corrosive for everyone subject to it. It makes the aggregate number stable, which blunts criticism, while making every individual firm’s position unstable, which prevents adaptation. Canadian exporters cannot plan around a policy whose only fixed parameter is its total.
The Canadian counter strategy, visible in the Carney government’s export diversification target and in the industrial support announced this week in Ottawa, accepts that premise. It assumes the duties are not going away on a predictable schedule and that the right response is to reduce the share of national output that depends on their disappearing.
For now, the practical horizon is October 30. Seven days to re paper a tariff position, for the third time since July, with the knowledge that it will probably change again before the year ends.