Canadian Lumber Producer’s Shares Fall 13% as U.S. Tariffs Add to Pressure After $46-Million Quarterly Loss

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A sharp selloff in Canadian lumber shares is exposing the financial strain facing one of North America’s major forest products companies. Interfor Corporation saw its shares tumble as much as 13% during trading on November 6, 2026, after reporting a $45.6-million third-quarter loss. The decline came as U.S. tariffs, uncertain construction demand and another potential hit from lumber duties complicated the company’s outlook.

Despite the disappointing headline numbers, Interfor’s underlying operations showed signs of improvement. Revenue increased, lumber production climbed and operating cash flow remained positive. However, the combination of trade barriers, mill closures and weaker seasonal lumber prices illustrates how difficult it has become for Canadian producers to maintain profitability in a deeply interconnected North American industry.

A 13% Share-Price Drop Raises Questions About Investor Confidence

Interfor’s share-price plunge came during the first trading session after its November 5 earnings announcement. On November 6, the Toronto-listed stock touched C$12.77, compared with C$14.73 at the previous close. That represented a decline of approximately 13.3% at the day’s low. The distinction matters because the 13% figure describes an intraday decline, rather than necessarily the closing loss. For shareholders, the reaction highlighted concerns about the prospects of a business already navigating a difficult period for North American lumber producers.

Investors were responding to more than the quarterly loss. Interfor warned that lumber markets could remain volatile through early 2027, with seasonal demand, U.S. trade restrictions and industry production adjustments influencing prices. That uncertainty makes sawmills harder to value because their profitability can change rapidly. A facility might produce more lumber and generate additional sales without delivering stronger earnings if transportation, operating expenses and tariffs absorb the gains. The selloff reflected those conflicting signals.

The $46-Million Loss Was Driven Largely by an Asset Write-Down

Interfor’s $45.6-million net loss, equivalent to $0.69 per share, marked a significant reversal from the $1-million profit recorded in the second quarter. However, it was considerably smaller than the $215.8-million loss reported during the same period in 2025. A major contributor was a $53.2-million non-cash impairment charge related to a previously curtailed operation in Eastern Canada. The charge reflects a reduction in the recorded value of assets rather than an equivalent amount of cash leaving the business during the quarter.

The distinction is important, but it does not eliminate the underlying concern. An impairment indicates that management has reassessed what a facility’s assets are worth under current operating and market conditions. Interfor’s quarterly financial statements recorded $63.2 million in asset write-downs and restructuring costs, including charges associated with operations in the U.S. South. For communities dependent on forestry employment, these adjustments raise broader questions about the future of underused mills, the viability of restarting production and the ability of local suppliers to withstand prolonged uncertainty.

Revenue Climbed, but Operating Earnings Lost Momentum

Interfor’s financial results contained a notable contradiction: sales increased while adjusted operating profitability weakened from the previous quarter. Revenue reached $832.1 million, compared with $804.4 million in the second quarter and $689.3 million a year earlier. Meanwhile, adjusted earnings before interest, taxes, depreciation and amortization, commonly known as EBITDA, declined from $92.3 million in the second quarter to $76.9 million. The adjusted EBITDA margin narrowed from 11.5% to 9.2%, showing that higher sales did not automatically translate into stronger margins.

The comparison with 2025 offers a more encouraging perspective. Interfor had reported a $183.8-million adjusted EBITDA loss in the third quarter of that year, making the latest positive result a substantial improvement. Nevertheless, adjusted EBITDA excludes several significant expenses and is not equivalent to net profit. For lumber producers, financing expenses, asset impairments and trade-related charges can produce a considerable difference between underlying operating performance and final earnings. Interfor’s latest results demonstrate how a company can recover operationally while remaining financially vulnerable.

U.S. Lumber Tariffs Continue to Squeeze Canadian Producers

Canadian lumber entering the United States faces several overlapping trade measures, making the cost of exporting increasingly complicated. On October 19, 2026, the U.S. Department of Commerce implemented new anti-dumping and countervailing duty rates following its seventh administrative review. The combined rate for the applicable “all others” category fell to 24.75%, compared with the previous 35.16% cash-deposit rate. Although the reduction should provide some relief for future shipments, it does not eliminate earlier assessments or the uncertainty surrounding continuing trade disputes.

A separate 10% tariff imposed under Section 232 of the U.S. Trade Expansion Act remains in effect on imported softwood lumber. For shipments subject to both measures, the headline rates total 34.75%, although applicable charges vary by producer and product classification. Interfor recorded $45.5 million in export-duty and tariff expenses during the third quarter, including $10.1 million in Section 232 tariffs. For Canadian sawmills, these charges can significantly reduce the money retained from American sales, even when demand remains sufficient to keep production lines operating.

Another Major Financial Hit Is Expected in the Fourth Quarter

Interfor’s latest quarterly loss may not represent the end of its accounting challenges. The company expects to record approximately US$63.3 million in additional non-cash duty expenses and US$11.4 million in related non-cash interest expenses during the fourth quarter of 2026. Together, those anticipated charges amount to US$74.7 million. They relate to the finalization of duty rates on historical lumber shipments, rather than an entirely new tariff imposed during the current quarter. The distinction helps explain why a reduction in today’s duty rate can coincide with an additional accounting expense.

The broader financial burden has accumulated over many years. Interfor’s third-quarter financial statements indicate that it has paid approximately US$732.4 million in cumulative anti-dumping and countervailing duties since 2017. Some historical assessments remain subject to appeals and reviews, creating uncertainty over the ultimate amounts payable or recoverable. The anticipated fourth-quarter adjustments do not mean the entire US$74.7 million must immediately leave the company’s bank accounts. Nevertheless, they complicate earnings forecasts and demonstrate how decisions concerning shipments made years earlier can continue affecting a lumber producer’s financial statements.

Lumber Production Increased Despite Difficult Market Conditions

Interfor produced 952 million board feet of lumber during the third quarter, an increase of 25 million board feet from the preceding quarter. The improvement was supported by the completed production ramp-up at its rebuilt Thomaston sawmill in Georgia, alongside higher operating rates in British Columbia and the southern United States. Lumber shipments reached 948 million board feet, remaining close to production levels. These figures suggest the company was able to improve manufacturing activity and maintain customer deliveries despite continuing challenges throughout its North American operations.

Selling prices also improved during the quarter. Interfor’s average realized lumber price reached $751 per thousand board feet, increasing $12, or approximately 2%, from the second quarter. However, the U.S. South was an exception, recording modest price declines. Cost reductions provided some relief, with average production costs during the first nine months of 2026 running $27 per thousand board feet, or 4%, below the full-year 2025 level. Management nevertheless expects fuel and other operating expenses to remain challenging. Higher production and more efficient mills help, but neither can fully protect profitability when market prices and trade costs remain unpredictable.

U.S. Operations Provide Protection, but Canadian Exports Remain Exposed

Interfor’s geographical footprint gives it an advantage that some Canadian lumber exporters do not share. Approximately 65% of its total lumber production is manufactured and sold within the United States, meaning those volumes do not have to cross the Canadian border and incur Canadian lumber import duties. The company estimates that only about 20% of its total production is exported from Canada into the American market and directly exposed to applicable trade measures. This diversification allows U.S. operations to provide some protection when Canadian export costs increase.

Nevertheless, the remaining exposure is financially important because Canadian mills compete in a market where profitability depends heavily on selling prices, timber costs and transportation expenses. Interfor also cannot completely escape the broader consequences of a trade dispute that influences supply, buyer behaviour and market pricing. Its annual lumber production capacity is approximately 4.5 billion board feet, spread across North American operations. Management believes Canadian lumber will remain necessary to meet U.S. demand over the medium term, partly because American producers face labour constraints, equipment delivery delays and lengthy timelines for expanding production capacity.

Operating Cash Flow Offers Interfor Some Financial Breathing Room

Despite reporting a substantial accounting loss, Interfor ended the quarter with more financial flexibility than it had three months earlier. The company generated $61.4 million in cash from operating activities after changes in working capital. Available liquidity increased to $462.4 million at September 30, compared with $441.8 million at the end of June. Interfor also reported positive operating cash flow in each of the first three quarters of 2026. These figures suggest that the business continued generating cash through its operations even as impairment charges weighed heavily on reported earnings.

Debt remains a significant consideration. Interfor’s net debt stood at $788.2 million at the end of September, down from $816.7 million in the second quarter. Its net debt-to-invested-capital ratio improved from 36.7% to 35.5%. Meanwhile, the company expects capital spending of approximately $100 million in 2026, followed by a preliminary budget of $75 million to $100 million for 2027. Maintaining that investment while reducing borrowing will require continued financial discipline. Sawmills need regular maintenance and modernization, even during weak markets, making the balance between saving cash and protecting future competitiveness especially important.

Slower U.S. Homebuilding and Seasonal Price Declines Add to the Pressure

Demand from American homebuilders remains one of the most important influences on North American lumber prices. According to the U.S. Census Bureau, privately owned housing starts reached a seasonally adjusted annual rate of 1.221 million units in September 2026, down from the revised August estimate of 1.288 million. Single-family housing starts, a particularly important source of structural lumber demand, were estimated at 859,000 units annually. Although the monthly changes carry considerable statistical uncertainty, the figures illustrate the uneven construction environment confronting lumber suppliers.

Interfor has already seen seasonal weakness emerge in its benchmark markets. In October, average Western spruce-pine-fir lumber prices declined by US$32 per thousand board feet, or 6%, compared with the third-quarter average. Southern yellow pine prices fell by US$49, or 11%, over the same comparison. The declines were not entirely negative news: both benchmarks remained significantly above their October 2025 levels, increasing 17% and 23%, respectively. For producers, however, even a relatively short decline can squeeze margins when production expenses and trade duties remain elevated. The challenge heading into winter is maintaining profitable sales while preparing for potentially stronger construction activity in 2027.

Ontario Mill Closures Reveal the Human Cost of the Lumber Industry’s Struggles

Interfor’s difficulties extend beyond investors and quarterly financial statements. Earlier in 2026, the company indefinitely curtailed operations at its Ear Falls sawmill in Ontario, followed by similar decisions affecting its Nairn and Gogama facilities in April. Interfor attributed the curtailments to weak market conditions and other operating challenges. For smaller communities, a sawmill shutdown can carry consequences far beyond the mill gates. Forestry operations support equipment contractors, trucking businesses, maintenance workers and local retailers. Even when a curtailment is described as indefinite rather than permanent, uncertainty can make household planning and community investment difficult.

The stakes are national as well as local. Statistics Canada reported that more than 58% of the country’s softwood lumber production was exported to the United States in 2024, illustrating the industry’s dependence on cross-border trade. Interfor’s geographically diversified operations may help cushion some of the financial impact, but they cannot remove that broader exposure. As 2027 approaches, the company faces competing priorities: lowering debt, controlling production costs, maintaining viable mills and navigating unresolved trade disputes. Its improving cash generation offers some encouragement, yet the sharp share-price reaction demonstrates that investors remain cautious. For forestry communities, the more consequential measure of recovery will be whether better market conditions translate into sustainable production and dependable jobs.

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