Canada's dairy supply management system is once again at the centre of a transatlantic trade dispute, with US President Donald Trump singling it out as a justification for new tariffs. The move threatens to escalate tensions between the two nations and has significant implications for British farmers and consumers who export dairy products to Canada.
The system, which has been in place since the early 1970s, controls the production, pricing, and import of dairy, eggs, and poultry by assigning production quotas to farmers. Provincial marketing boards then set prices, providing a predictable income for farmers and ensuring a stable domestic supply of essential food products. However, it also imposes significant import tariffs on foreign dairy exceeding small quota limits, making it expensive for international producers to compete in the Canadian market.
The US is set to implement a 50% tariff on $20 billion worth of Canadian imports, including dairy products, in August. President Trump has argued that this system is 'unreasonable' for American farmers who are keen to expand their sales into the Canadian market. The US imported approximately $1.3 billion worth of Canadian dairy products in 2025, but American producers currently have tariff-free access to only 3.5% of Canada's market.
Canadian politicians have shown little inclination to budge on the issue. Quebec Premier Christine Fréchette has stated that supply management is 'non-negotiable', while US-Canada Trade Minister Dominic LeBlanc has emphasised its importance as a 'cornerstone of Canada's economy and our rural communities'. The dairy industry itself is a powerful lobby in Canada, known for staging protests to defend its interests during trade negotiations.
This is not the first time Canada's dairy policy has drawn international scrutiny. The previous Biden administration challenged Canada's dairy quota practices twice under the USMCA trade pact. Additionally, the Organisation for Economic Co-operation and Development (OECD) has criticised the system, arguing that it distorts production and trade. Even some Canadian economists have advocated for its reform or dismantling.