The arithmetic the announcements leave out is not complicated. Fifty percent on the roughly $20 billion of goods Vox reports being covered [3] is about $10 billion of duty a year if nothing reroutes [1], on a basket that is only about 5% of the $382 billion the US imported from Canada last year [2]. That is how Erica York of the Tax Foundation can say the macro employment effect will be modest while the sector effects are severe [11]. The concentration is the point. The list names beer, wine, spirits, milk products and hockey equipment [2], plus motorcycles, honey, clothing, paper, smartphones and dog leashes [4]. Paper and paper products alone were $3.3 billion last year according to Census Bureau data [8], roughly a sixth of the tariffed basket [5].
The January 2027 line is the larger one. Passenger cars alone accounted for about $25 billion of imports last year [7], more than the entire basket now being taxed [3]. Fifty percent of that flow is $12.5 billion of duty at unchanged volumes, and Trump's post named trucks, parts and steel as well [6], so the real base is wider. Olu Sonola of Fitch Ratings puts the additional burden at up to $5 billion [9], about two fifths of the passenger-car figure by itself [4]. That gap has to be filled by exemptions or by a collapse in volumes. Neither has been published, which means anyone planning against the $5 billion number is planning against someone else's assumptions.
Retaliation is measured in dollars, not in product categories. Carney said Canada will match dollar for dollar starting early next month [5], so the exposed American firms are picked by Ottawa's list rather than by whether they buy anything Canadian at all. The reason to read the schedule as real rather than as leverage sits outside the tariff tables: Vox reports the US also asked Canada to weaken its French-language protections, which Carney treated as a question of sovereignty [17]. A concession on goods does not obviously settle that, and Carney had already used a January speech to sketch a plan for depending less on the US as a partner [18].
Pre-buying is the obvious defence against a dated increase, and holding the stock is getting dearer. Inflation cooled to 3.4% in July, still above the Fed's 2% target [12], and the Fed's own projections point to at least one hike in 2026 under Kevin Warsh [13]. Inventory built ahead of January 2027 is therefore financed into a tightening rate. For homebuilders the input is the constraint rather than the carry: Canada is a major lumber supplier, and the US has far less publicly owned forest land to backfill from [14].
Goods already ordered are the part no calendar helps. Debbie Safran of Houndstooth Pet Boutique in Burlington, Vermont, has placed but not received this season's order of Canadian-made dog coats, and expects the tax bill when it lands [15]. Michigan's governor makes the same point at scale, noting that building a car means moving parts across the border several times [16].