The latest US tariffs on Canadian wood are being reported as a single number, 50%. Read the order and that number lands on panels. The product that dominates the trade, softwood lumber, is exempt from this round, and the duty it does carry is a different figure that was already in place.
Every figure below comes from a source that is linked and can be opened. Where we could not open one, we have left the claim out and say which at the end.
What the 50% actually covers
The new tariff takes effect on 19 August 2026 under Section 338 of the Tariff Act of 1930. For forestry it added 98 line items, and read across those lines the products are panels: plywood, fibreboard, particleboard and veneered panels, with paper and wood-derived goods alongside.
Softwood lumber is not on the list. The framing lumber that crosses the border in the largest volume is exempt, because it is already tariffed by another route and has been for years. The combined antidumping and countervailing duty on most Canadian producers runs at 35.16% of the entered value, with a 10% Section 232 tariff on top, in force since October 2025. All-in, 45.16%.
So the headline number is attached to the smaller of the two trades, and the figure that actually moves the lumber market is the quieter one, because nothing about it changes on 19 August.
What this costs a Canadian producer
You do not have to model the burden, because at least one large producer reports it. West Fraser's second-quarter results record $44m of export duties and tariffs in the quarter, and $202m across the first half of 2026.
Set that against the result. The company posted a net loss of $61m for the quarter on sales of $1,434m. Its lumber segment turned over $729m and lost $12m at the operating line. So the quarter's duty runs to about six per cent of what that segment sold, and roughly three and a half times what the segment lost. The duty line is recognised company-wide rather than charged to one segment, so treat those as scale comparisons rather than a clean attribution.
It does not explain the whole loss, and the company would point to soft pricing and freight as well. But a cost line of that size set beside a loss of that size is the first place a reader should look.
Then the part that matters if you are not West Fraser. Its own combined duty rate is 26.47%, below the 35.16% most producers carry. A producer on the general rate pays about a third more duty on every dollar of entered value than the company in these results does. The published figures are therefore the better case, not the typical one, and most of the industry is working with less room than these numbers suggest.
The relief is smaller than it sounds
A duty charged as a percentage takes its weight from the price it is charged against, and that price has been falling. Framing lumber futures closed at $625 per thousand board feet on 30 July 2026, down about 9.7% year on year. The margin is pressed from both sides: a lower price to sell into, and a percentage that holds.
Against that, relief is in train. In April 2026 the US Department of Commerce moved to cut the combined duty from 35.16% to 24.83% in the seventh administrative review. The coverage called it a 10-point cut, and on the duty alone it is. But the Section 232 tariff is not part of that review, so the all-in rate falls to 34.83% rather than into the mid-20s, and it arrives into that weaker market. The final result is due in August 2026, and would be the first downward revision since the dispute began in 1982.
What changes for a US panel producer
A duty on the product across the border is a price umbrella held over your own boards, and on 19 August the panel tariff widens it considerably. Around $900m of Canadian trade reprices in one day: $500m of plywood, where Canada is the third largest supplier into the US, and $400m of fibreboard, where it is the largest supplier outright.
That is the size of the flow that suddenly costs half as much again to bring in. It is not the size of the prize, because some of it will keep coming at the higher price, some will come from elsewhere, and some demand will simply go away. But if you make plywood or fibreboard in the United States, that $900m is the pool your commercial team is now competing for, and it changes on a known date.
And what it costs a US buyer
The same tariff reads differently from the other side of the yard, and it is worth saying so plainly. If you convert panel rather than make it, this is a straight input cost rise on 19 August. Cabinet shops, millwork operations, furniture and packaging converters buying Canadian plywood or fibreboard are the ones paying for the umbrella that shelters the mills.
Those firms outnumber the panel producers considerably, and their usual first move is to find out which of their own SKUs are exposed and what the alternatives cost. That is a data question before it is a purchasing one, and most of them cannot answer it quickly, because the tariff schedule and their own catalogue have never been joined up.
What we do with this
Our own work here joins two lists that usually sit apart: the tariff and duty schedule, by product line, and the operator's own catalogue, inventory and customer history. Match on product codes and description and the platform returns two things: the SKUs the business holds that now sit under a tariff or a duty wall, ranked by volume, and the accounts that bought the imported equivalent in the past, ready for the sales team to call. It reads the customer's own systems, so the list is theirs and current rather than a market estimate, and no new data is collected.
Sources
- BNN Bloomberg, 22 July 2026, on the 50% tariff, Section 338, the 98 forestry line items, the plywood and fibreboard trade values, and the collective duty on softwood
- West Fraser Timber, second quarter 2026 results release, for the $44m quarterly and $202m half-year duties, the 26.47% combined rate, the 10% Section 232 tariff, and the lumber segment result
- Wood Central, on the 35.16% and 24.83% combined rates, the antidumping and countervailing split, and the 45.16% and 34.83% all-in figures
- Trading Economics, for the framing lumber futures price of $625 per thousand board feet on 30 July 2026 and the year-on-year change
Two things are left out for want of a source we could open. We do not put a total dollar value on Canadian softwood lumber exports to the US, though it is far larger than the panel trade the 50% covers, because we could not open a primary figure and did not want to quote one second hand. And we quote West Fraser's duty because the company files it; we have not tried to estimate the equivalent for producers that do not report a company-specific rate.
On the timing of the final review result, our source says both "early August" and "late August" in the same piece. We have written "August" rather than pick one. The 50% tariff takes effect on 19 August 2026 and had not done so at the time of writing.