New U.S. Softwood Lumber Rule Takes Effect Today as Canadian Producers Remain Squeezed at the Border

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A new U.S. softwood lumber rule takes effect on October 22, 2026, adding another layer of border administration to a North American lumber market already shaped by tariffs, annual trade reviews and a decade-long Canada-U.S. dispute.

The change itself is narrower than the headline tariff fight. The U.S. Department of Agriculture is clarifying how a longstanding industry assessment is calculated when imported lumber is measured differently. For most Canadian lumber, the immediate effect should be limited because Canadian producers already use the North American nominal-size convention targeted by the regulation. The larger problem remains elsewhere: Canadian producers entering the U.S. market are simultaneously facing newly updated antidumping and countervailing duties, plus a separate 10% national-security tariff.

What Today’s Rule Actually Changes at the Border

The regulation taking effect today comes from the U.S. Department of Agriculture’s Agricultural Marketing Service and modifies the Softwood Lumber Research, Promotion, Consumer Education and Industry Information Order. That program finances industry research, promotion and education through assessments collected from U.S. manufacturers and importers. The underlying assessment is not increasing for North American lumber. It remains US$0.41 per thousand board feet when calculated using the nominal measurement convention commonly used in Canada, the United States and Mexico.

U.S. Customs and Border Protection collects the assessment on imports as lumber enters the country. What changes today is the wording governing how imported volumes must be converted and reported. USDA concluded that the previous language was not explicit enough for Customs to enforce a consistent measurement method. That distinction is important for Canadian producers: the rule is a compliance clarification rather than another broad tariff aimed specifically at Canada. Yet it arrives while Canadian shipments are already navigating a far more expensive set of duties at the same border.

The Rule Is Really About How Lumber Is Measured

The technical problem behind the regulation sounds minor until the numbers are compared. North American lumber is commonly sold by its nominal dimensions. A piece called a two-by-four, for example, is measured for this purpose using dimensions associated with the board before drying and planing, even though its finished dimensions are closer to 1.5 by 3.5 inches. European suppliers, by contrast, often report the actual—or “net”—dimensions of finished lumber.

That created an assessment gap. USDA says 1,000 cubic metres reported on a nominal basis converts to about 423.8 thousand board feet. The same volume reported using the net convention converts to about 636.9 thousand board feet, roughly 1.503 times as much for assessment purposes. The nominal assessment therefore remains US$0.41 per thousand board feet, while the equivalent rate for lumber reported on a net basis is US$0.62. USDA estimates that correcting the discrepancy will add more than US$367,000 to the Softwood Lumber Board’s budget, with European importers expected to feel most of the direct effect.

Canadian Producers Still Face a Much Larger Tariff Wall

For Canadian mills, the much bigger numbers arrived through a separate U.S. Commerce Department process. Final results from the seventh administrative reviews of the Canadian softwood lumber antidumping and countervailing duty orders became applicable on October 19. For many non-selected companies covered by the review, Commerce established a 10.64% antidumping rate and a 14.11% countervailing rate, producing a combined trade-remedy rate of 24.75%.

That is lower than the roughly 35.16% combined rate that had previously applied to many producers, but it is not the whole border bill. A separate 10% Section 232 tariff on covered timber and softwood lumber remains in place, taking the total for many producers to 34.75%. Company-specific exposure varies considerably: the Canadian government lists combined antidumping and countervailing rates of 31.11% for Canfor, 25.55% for Resolute and 20.02% for West Fraser. With the additional Section 232 tariff on covered shipments, the corresponding totals can reach approximately 41.11%, 35.55% and 30.02%, respectively.

Why the U.S. Market Still Matters So Much to Canada

The reason those percentages matter stretches far beyond customs paperwork. Statistics Canada reported that Canada produced almost 47.9 million cubic metres of softwood lumber in 2024 and exported roughly 27.9 million cubic metres to the United States. In other words, more than 58% of Canadian softwood production went directly into the American market. Across the broader wood-products category, 86% of Canadian exports went to the United States.

British Columbia illustrates the exposure particularly clearly. The province’s Interior produced almost 14 million cubic metres of softwood lumber in 2024 and shipped about 8.9 million cubic metres to the United States. Those Interior shipments represented roughly 32% of all Canadian softwood lumber exports to the U.S. For communities built around harvesting, trucking, sawmilling and equipment services, trade policy can therefore translate quickly into decisions about operating schedules, investment and production. The wider Canadian forestry sector contributed $21.6 billion, or about 0.9%, to real national GDP in 2024.

Cash Deposits Make the Border Cost More Than an Accounting Exercise

The trade-remedy system also affects companies differently from an ordinary final tax bill. Commerce’s administrative reviews determine both assessments on past entries and cash-deposit requirements for shipments moving forward. Under the October results, Customs is instructed to collect estimated antidumping and countervailing deposits on covered shipments using the newly established rates, with company-specific rules depending on the producer and exporter involved. Final liability can later be determined through subsequent administrative processes.

That matters in a market where lumber prices are not simply rising enough to absorb every new cost. Madison’s Lumber Reporter put its North American lumber price index at US$499 per thousand board feet for the week ending October 16, down slightly from US$500 the week before and US$505 a month earlier. The relatively steady-to-lower price environment helps explain why producers describe border measures as pressure on competitiveness rather than something that can automatically be passed through. A mill can face a large percentage charge on entry even when the underlying commodity market is offering little additional pricing room.

U.S. Home Builders Have Their Own Reason to Care

Canadian producers are not the only businesses watching the duty calculations. The National Association of Home Builders has repeatedly opposed tariffs on Canadian lumber, arguing that the United States does not produce enough softwood lumber domestically to meet demand. NAHB estimates that Canada supplies roughly 85% of U.S. softwood lumber imports and almost one-quarter of the total softwood supply available in the country.

That connection makes lumber policy part of the American housing-cost debate as well as a Canadian trade issue. NAHB said after the latest Commerce review that total duties of 34.75% remain a burden on housing affordability, even after the antidumping and countervailing portion declined. In a broader builder survey covering recent tariff actions across construction materials—not lumber alone—NAHB reported an estimated typical impact of US$10,900 per new home. The precise effect of lumber duties varies with prices, sourcing and market conditions, but builders argue that making a major imported construction input more expensive ultimately creates another obstacle for housing supply.

A New Board Seat Shows Where U.S. Lumber Capacity Is Growing

Today’s USDA rule contains another change that has nothing to do with Canadian tariff rates but says something about the evolution of the North American industry. The Softwood Lumber Board must periodically review whether its membership reflects where lumber is actually being produced and imported. Using 2022 through 2024 data, the board found that the U.S. South had become increasingly important to domestic production.

USDA reported average production of almost 22.1 billion board feet in the U.S. South, compared with more than 13.6 billion in the West and about 1.6 billion in the Northeast and Lake States. Imports averaged nearly 15.2 billion board feet. As a result, the rule adds another U.S. South representative, increasing the board from 14 to 15 industry seats, plus one public member for 16 members overall. The Softwood Lumber Board says the change will be implemented with nominations for the 2028 board. It is a small governance adjustment, but it reflects the growing competitive importance of southern U.S. mills.

The Dispute Is Already Moving Into Another Review Cycle

None of these changes settles the underlying Canada-U.S. softwood lumber dispute. The last bilateral agreement expired on October 12, 2015, after providing nearly nine years of managed trade. A one-year standstill followed, but negotiations failed to produce a replacement. U.S. producers filed new trade cases in late 2016, and Canadian softwood lumber has faced antidumping and countervailing measures through the current dispute cycle since 2017.

Even as the seventh administrative review has just produced new rates, the eighth review is already underway. Commerce selected Resolute and West Fraser as mandatory respondents, and the Canadian government says preliminary results are expected between October 2026 and late January 2027, with final results potentially arriving between February and August 2027. That means today’s USDA rule is best understood as one piece of a much larger system. Canadian lumber still has access to its largest foreign market, but that access is being filtered through assessments, tariffs, deposits, company-specific calculations and another review cycle before the current one has had time to fade from view.

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