The unit is sitting in Pennsylvania. The customer is in Ontario. The tax is decided by a factory neither of them has been to.
Seven days from now that stops being trivia.
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What lands on September 8
On August 25 the Department of Finance published the list. Effective September 8, Canada applies counter-tariffs of 15, 25 or 50 percent to roughly $27.6 billion of US goods, each rate mirroring the US rate on that same good. Ottawa's word for it was dollar for dollar.
It is an answer to what happened on August 22, when the United States applied an additional 50 percent duty to a list of Canadian products under Section 338 of the Tariff Act of 1930 — a provision that lets the President impose duties of up to 50 percent on a trading partner found to discriminate against US commerce, and one that had not been seriously used before this cycle. Covered goods stayed subject to everything they already carried.
Now read Canada's list, because this is not the list you are expecting.
Dairy, yes. Steel and iron, yes. And then: perfumes, cosmetics and hair products. Plastic tableware, packaging and floor coverings. Tissue, kraft paper and cardboard. Textiles, carpets and apparel. Sawn lumber, plywood and laminated veneer. Glass containers.
That is not a list of industrial inputs. That is a list of things sold on a marketplace, in a box, one unit at a time.
Goods already in transit to Canada on September 8 are exempt. Everything behind them is not.
The tax is on the origin field, and the origin field is not the shipping label
Here is the part that gets read backwards, and it gets read backwards by experienced people.
Canada's surtax does not attach to goods that ship from the United States. It attaches to goods that are United States goods. The 2025 surtax orders — the template this one follows, and the regulations the August 25 announcement itself points to — define the target as goods eligible to be marked as goods of the United States in accordance with the Determination of Country of Origin for the Purpose of Marking Goods (CUSMA Countries) Regulations. The surtax is then charged as a percentage of the value for duty.
Read that twice, because it inverts the last two years of your instincts.
A unit made in China, imported into your US warehouse, and shipped to a customer in Toronto is not a US good. It is a Chinese good that happens to be leaving from Pennsylvania. Canada's list does not touch it.
A unit made in Ohio, in the same warehouse, on the same truck, to the same customer, is a US good. If its category is on the list, it carries 15, 25 or 50 percent.
Same box. Same lane. Same buyer. The entire difference is a field on a customs form that most operators have never personally read, filled in years ago by whoever set up the SKU.
And now the second half, which is worse and is the reason this is an intelligence problem rather than a customs problem.
You have spent two years learning that CUSMA origin is the exemption lane — the thing that got your goods around the tariff. On the US side, that stopped being true on August 22: the guidance on the new Section 338 duty is explicit that USMCA origin does not exempt covered goods. On the Canadian side, being markable as a US good is not the exemption. It is the qualification.
North American origin now buys you nothing at one border and costs you up to half the value of the good at the other.
Why you will not see it on your P&L
Now the part that decides whether this costs you anything, and it has nothing to do with customs law.
If you sell into Amazon.ca out of US inventory through Remote Fulfillment, the Canadian customer is the importer of record. Amazon estimates the import charges and collects them from that customer at checkout, on your behalf. The money moves from a Canadian shopper to a Canadian authority. It never touches your account.
Which means the surtax does not appear anywhere you look for problems. Not in your fee report. Not in your landed cost. Not in your margin by SKU. Your cost per unit on September 9 is identical to your cost per unit on September 7.
What changes is the number on the buy button.
A shopper in Vancouver comparing two similar products sees one total that went up by a quarter and one that did not. She does not know why and does not care. She converts on the other one. On your side of the glass, that is not a tariff event. That is a conversion-rate event with no cause attached, in a market small enough that you will attribute it to seasonality and move on.
And the size of it is set by a rule worth carrying around. A surtax is charged against the value for duty, and for a parcel bought by a Canadian consumer that value is built off the price the purchaser paid — essentially your retail price. The same unit imported into Canada as commercial inventory is valued at what you paid your supplier. Identical rate, a fraction of the base. Which is the first time in a while that holding stock in Canada has an argument behind it that is not about delivery speed.
And there is a floor that used to catch this, which is worth knowing about precisely because it is about to stop catching it. Parcels from the US clear Canadian customs duty-free under CAD $40 and duty-free up to CAD $150 under the courier thresholds — the reason cross-border marketplace shipping works at all at these order values. Under the 2025 orders, that remission did not extend to a surtax: goods otherwise eligible for courier or postal remission still had to be accounted for where a surtax applied, and the notices were explicit that the surtax reached goods imported for personal as well as commercial purposes. If this order follows that template — and every indication is that it will — the de minimis floor you are quietly relying on does not stop it.
Meanwhile, look at what Amazon did with the same information.
Amazon is reported to have shifted some of its Canadian direct-import sourcing from the United States to China specifically to avoid tariffs — in a planning document dated March, five months before Canada published this list. Reported alongside it: Amazon expects Canadian package volume to grow more than 40 percent between 2026 and 2029, faster than the US.
Amazon's retail arm can change its country of origin with a purchase order. It buys from whoever it chooses and re-sources when the arithmetic moves.
You cannot. Your origin is your factory, your tooling, your certifications and eighteen months of lead time. Amazon solved this for its own book in March. Your version of the same fix is a 2028 project.
That is the actual asymmetry in this issue, and it is not a customs asymmetry. Amazon is growing a market by 40 percent while re-sourcing around the tax that market imposes, and the sellers filling that demand are the ones who cannot move.
The Numbers
September 8 — effective date, announced August 25. Goods in transit to Canada that day are exempt. That exemption expires by arithmetic, not by application
$27.6B — value of US goods on Canada's list, matched dollar for dollar against the US action of August 22
15 / 25 / 50% — the three surtax rates, each mirroring the US rate on the same good, charged on the value for duty
CAD $40 / $150 — the courier thresholds that make cross-border marketplace shipping viable. Under the 2025 template, remission under those programs did not release a good from a surtax
0 — Amazon seller-facing notices tying any of this to Remote Fulfillment. The list is published by product category. Nobody is going to map it to your catalog
Translation: The tax is levied on where the unit was made, not on where it shipped from — so the Chinese-made unit in your US warehouse is exempt and the American-made one beside it is not. It is collected from your customer at checkout, which means it will never appear on your P&L, only in your conversion rate. You have seven days and an in-transit exemption. After that, the only signal you get is Canadian units quietly going soft.
The Brief
Walmart's stores now fulfil 80% of its ecommerce orders. That figure came from CFO John David Rainey this week, and it is a cost-to-serve number, not a logistics trivia number. Last-mile out of an existing store is structurally cheaper than last-mile out of a fulfilment network, and cheaper cost-to-serve is what funds a price position in November. Between this and the tariff refund Walmart said it would point at lower prices, you now have two independent reasons to set your Q4 floor off contribution margin in September rather than reacting to somebody else's price in December.
The $800 de minimis repeal survived its court test on August 13. The US Court of International Trade upheld the rescission of the duty-free exemption. If your model still carries a provisional refund line against that duty — and plenty built in the spring do — that line is now an asset you do not have. Take it out before it prices a Q4 buy.
Amazon Accelerate is September 22–24 in Seattle. Historically Accelerate is where the seller-facing tooling gets announced on top of infrastructure Amazon has already shipped through the year — which this year means the 75-character title regime, the new selection program, and whatever the AI-search layer is going to be called. Three weeks out. If you are planning a Q4 tooling decision, it is worth waiting three weeks to make it.
Quick Win
Do not delegate this one. It is five minutes and you want to see the answer yourself.
One field, five ASINs. Most of you are finished in five minutes and finished for good.
Open Manage Your Compliance and read the country of origin on your five best-selling Canadian ASINs. It sits behind the Send to Amazon workflow's Customs Compliance section — Amazon holds a Country of Origin and a 10-digit HTS code for every SKU, whether or not anyone at your company has ever looked at it.
Anything other than United States and you are done. Close the tab. Canada's list reaches US goods, and Chinese, Vietnamese, Indian or Mexican inventory sitting in a US warehouse is not one — the parcel leaves America, the good does not come from there. That is the whole exposure test. If the field is blank, your answer lives with whoever keeps your commercial invoices, and that is one email rather than a project.
United States on any row, and you have two moves today. Check that product's category against the list — cosmetics and personal care, plastics, paper and tissue, textiles and apparel, wood, glass, dairy, steel and iron. And if a Canadian replenishment was already scheduled for September, ship it this week. Goods in transit on September 8 are exempt, nobody applies for that exemption and nobody grants it, and it stops existing on Monday week.
The artifact: five ASINs, one column, one word in each cell. That is the entire document, and for most of this list it is the end of the story — which is the useful part. Your feed is going to spend the next ten days telling you Canada just taxed your business. Five minutes tells you whether it taxed anybody's.
If a row does come back United States in a listed category, that is the point where it earns an afternoon: twelve months of Canadian revenue by ASIN out of Business Reports, your commercial invoice as the authoritative check on what the portal holds, and your Amazon.ca price plus the rate set against the competing offers on that page. Nobody who cleared step two needs any of it.
Amazon changed its country of origin in March.
Yours is a factory, and it is not going anywhere by Monday week.
See you Friday.
Have any questions? Grab a 15-minute slot here: book a time here.
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— Dan
