The Saskatchewan potash export tariff has become a flashpoint in Canada’s escalating trade dispute with the United States, after the province’s premier, Scott Moe, publicly ruled out weaponising the commodity even as Ottawa prepares a fresh round of retaliatory measures set to take effect on 8 September.
Moe made his position clear at a press briefing on Wednesday. ‘What we as a province cannot and will not support is any kind of export tariff on our natural resources or any of our resources that are being exported to the US or through the US to other areas of the world,’ he said. The same logic, he argued, applies to oil: ‘We cannot in any way support the adding of export tariffs on a product like oil,’ calling such a move ‘an unsustainable hit to our Canadian economy.’
Why the Saskatchewan potash export tariff debate matters so much
The stakes are high because of Saskatchewan’s outsized role in the global potash supply chain. Canada is the world’s largest potash exporter, accounting for about 40% of global exports in 2024, according to data from the Canadian government. The US received 53% of Canada’s potash shipments that year. What the headline figures do not capture is the provincial concentration: according to BNN Bloomberg, Saskatchewan alone supplies the US with more than 86% of the potash it receives from Canada. That dependency cuts both ways: it gives Saskatchewan genuine leverage, but it also means the province absorbs the first and heaviest blow if the US finds alternative suppliers or retaliates further.
Moe’s concern is precisely that asymmetry. Taxing potash exports, he argued, would cost Canadian jobs and push US buyers toward other sources, delivering a self-inflicted wound rather than meaningful pressure on Washington. He urged Ottawa to focus instead on measures that bring the US back to the negotiating table, warning against ‘policies that maybe make us feel good at the moment.’
Counter-tariffs and the local cost for Saskatchewan
The broader context is a rapid deterioration in trade relations. Negotiations broke down last week. New 50% US tariffs on about $20 billion of Canadian imports took effect on Saturday, and on Monday President Donald Trump threatened to raise tariffs on Canadian-made vehicles, auto parts and steel to 50% beginning 1 January 2027. Canada’s dollar-for-dollar response, announced on Tuesday, targets 27.6 billion Canadian dollars (about $20 billion) of US imports, covering steel, dairy and electronics among other categories.
For Saskatchewan specifically, that retaliation carries a measurable domestic price. CBC reports that the new counter-tariffs cover about $1.5 billion, or 11.3%, of Saskatchewan’s annual imports from the US. Moe said he supports Ottawa’s targeted countermeasures, provided they carry ‘a minimal impact on Canadian industries and families’ and a larger effect on the US. The distinction he is drawing is between counter-tariffs on US goods coming into Canada (which he accepts) and export tariffs on Canadian potash or oil heading to the US, which he rejects outright.
Moe said he has not heard Ottawa propose export tariffs on either commodity. The White House, for its part, exempted energy and potash from its latest 50% tariff round, which limits the immediate pressure on those sectors but leaves the underlying vulnerability intact if negotiations fail to progress.
Saskatchewan is retaliating on its own terms in a narrower area: starting 8 September, the province will impose a 50% levy on American alcohol while continuing to stock and sell US products. The measure is designed to sting without disrupting the province’s own resource exports.
Canadian leaders have cast a wide net for leverage elsewhere, including reconsidering F-35 purchases, targeting US coal shipments and raising the possibility of cutting off electricity exports. Canada and the US traded about $870 billion in goods and services in 2025. The 8 September counter-tariff deadline is now the next concrete date on which the conflict’s trajectory will be tested.