Two levers appear in these files, and only one of them moved. According to Business Insider's review, Amazon's March answer to tariffs was to change where goods come from: some Canadian direct-import sourcing was shifted out of the US and into China "to avoid tariffs" [8]. The capacity commitments were left alone. The company was still setting out fulfillment, same-day and logistics expansion for Canada in late July, after the additional 50% duty had been announced [1][2][4]. That is a tariff treated as a routing question rather than a reason to stop pouring concrete [3].
The growth number is doing the work. More than 40% in total between 2026 and 2029 [10] is, if that window is three years of compounding, roughly 12% a year [1], and Amazon expects each of those years to run ahead of the US rate [11]. Business Insider notes the forecasts are preliminary and subject to change [3], which is the honest caveat on any plan written mid-escalation.
What has changed underneath the plan is the hedge. In March, Amazon told itself the Canadian tariff impact was smaller than the US impact because many goods were protected under USMCA, while also warning that "the risk of a Canadian recession is higher than usual due to US trade policy uncertainty" [9]. The July 20 measure reaches some goods that qualify for USMCA protections [5]. The treaty coverage that softened the March read does not cover the new duty [2], so country of origin now has to carry the load the agreement used to.
The exposure also reverses direction. Canada's retaliation starts Sept. 8 and includes appliances and electronics [12]. Amazon's Remote Fulfillment program lets third-party sellers list on the Canadian marketplace while holding inventory in US warehouses, with the goods crossing the border once a Canadian customer orders [13]. That is a per-order border event on the northbound side, sitting inside a program built for sellers who never wanted Canadian inventory. Amazon says prices in its Canadian store have not moved outside normal fluctuations and that it is monitoring the new duties [14].
Which leaves the reason the capital plan survived the tariff, and it is not confidence about trade. The March document says "Amazon Canada faces a critical competitive challenge as major retailers are outpacing our delivery capabilities, putting future growth at risk," naming investments by Walmart, Loblaws and Best Buy [15]. Duties raise a cost line that can be re-sourced. Losing delivery parity forfeits the 40% itself, and no sourcing change buys that back. The public framing is the C$65 billion, about $47 billion, invested since 2010 and more than 46,000 people at Canadian operations sites [6][7], a total dated from 2010 even as the company describes nearly 25 years of investing in the country [16]. The internal version is narrower and more useful: speed is the growth, and the border is a cost to be routed around while the trucks keep arriving.