Canada’s dairy market is often described as closed to the United States. That description is politically useful, but it is not literally true.
Canada does protect its dairy sector through supply management. It also allows substantial volumes of foreign dairy products into the country through tariff-rate quotas, or TRQs, negotiated under the WTO, CETA, CPTPP and CUSMA. The United States has specific guaranteed access under CUSMA, and Canada remains a net importer of dairy products overall.
The real debate is not whether the Canadian market is open or closed. It is how much access foreign producers receive, under what rules, and what that access means for Canadian farmers.
Is Canada’s dairy market closed?
No.
A closed market would mean foreign dairy products could not enter Canada. That is not the Canadian system. Imported cheese, butter, milk, cream, yogurt, powders and other dairy products are sold in Canada every year.
What Canada uses instead is a system of managed access. Certain quantities can enter at low or zero tariffs through tariff-rate quotas. Imports above those quantities can face much higher tariffs.
Those import controls are one of the three pillars of supply management in Canada, alongside production management and farm-gate pricing.
What access did Canada give the United States under CUSMA?
CUSMA created additional Canadian market access for a long list of U.S. dairy products, including milk, cream, butter, cheese, milk powders, yogurt and ice cream.
For milk alone, the agreement established a tariff-rate quota that grows over time. In quota year eight, the scheduled quantity reaches 51,005 metric tonnes. Under the agreement, up to 85% of that milk quota can be reserved for bulk milk intended for further food processing.
Milk is only one category. CUSMA also includes separate access quantities for cream, butter and cream powder, skim milk powder, other milk powders, cheese and several other dairy products.
For a detailed explanation of those rules, see CUSMA, Tariff-Rate Quotas and Dairy Trade in Canada.
Does a tariff-rate quota mean imports are guaranteed?
No.
A TRQ creates the right to import up to a certain quantity at a preferential tariff. It does not force buyers to import that amount.
A quota can remain partly unused because of price differences, transportation costs, demand, exchange rates, allocation rules or a lack of commercial interest. This distinction matters because political debates sometimes treat available quota and actual imports as if they were the same thing.
If a quota is not completely filled, that does not mean the market was closed. It means some of the access available under the agreement was not used.
Canada imports much more dairy than it exports
The broader Canadian trade figures also make the idea of a completely closed dairy market difficult to defend.
According to Agriculture and Agri-Food Canada, Canada imported about $1.93 billion worth of dairy products in 2025 while exporting roughly $560 million.
That left Canada with a dairy trade deficit of approximately $1.37 billion.
This does not mean every imported dollar came from the United States. Canada imports dairy products from several trading partners. But it does show that supply management does not prevent foreign dairy products from entering the Canadian market in significant quantities.
So why are Canadian dairy tariffs so high?
This is where the debate often becomes confusing.
Canada’s very high dairy tariffs generally apply above the negotiated quota volumes. They are designed to prevent unlimited imports from overwhelming a domestic production system in which Canadian farmers are themselves required to limit production.
That distinction is central to understanding supply management.
Canadian dairy farmers cannot simply produce as much milk as they want when prices are attractive. Production is controlled through dairy quota. If imports were unlimited at low tariffs while domestic production remained restricted, the production-control pillar of the system would become difficult to maintain.
The high over-quota tariff is therefore not the whole border policy. It is the outer wall of a system that also includes negotiated quantities entering at much lower tariff rates.
Why does the United States still object?
Because the disagreement is not simply about whether access exists.
The United States has repeatedly challenged how Canada administers some CUSMA dairy TRQs. Washington has argued that allocation rules can make the quotas harder for some U.S. exporters to use, particularly when access is reserved for certain categories of Canadian importers or processors.
Canada has defended its right to administer the quotas within the terms of the agreement. CUSMA dispute panels have examined those rules more than once, with mixed results for the two countries.
That is a legitimate trade-policy dispute. But it is different from saying the United States has no access to the Canadian dairy market.
Does additional U.S. access affect Canadian farmers?
Yes.
Under supply management, Canadian production is adjusted to the size of the domestic market. If a larger permanent share of Canadian dairy consumption is supplied by imports, there is less domestic demand left for Canadian farms to supply.
That does not necessarily mean production immediately falls every time a shipment crosses the border. Demand changes constantly. But over time, permanent import access reduces the portion of future market growth reserved for domestic production.
This is why Canadian governments have offered compensation to supply-managed sectors after granting additional market access in major trade agreements.
Is the Canadian market less open than the U.S. market?
That question is harder than it sounds.
Canada relies visibly on production quotas and tariff-rate quotas. The United States uses a different mix of policies, including farm programs, insurance, government purchasing, federal milk marketing rules and other forms of agricultural support.
The two systems are not mirror images, so comparing one tariff number with one U.S. policy does not tell the full story.
A useful comparison has to ask several questions at once: How much product actually crosses the border? What government support exists on each side? How are farmers paid? How are imports administered? And how much market access has each country negotiated?
Why the phrase “closed market” is misleading
Calling Canada’s dairy market closed compresses a complicated system into a slogan.
The Canadian market is certainly protected. It is also managed. But it is not closed.
Foreign products enter under several trade agreements. CUSMA provides specific duty-free or low-tariff access to U.S. dairy products. Canada imports substantially more dairy than it exports overall. At the same time, imports above negotiated access levels can face high tariffs because Canada is trying to preserve a domestic production-control system.
Whether that balance provides too much protection or too little access is a legitimate political and economic debate. But that debate should begin with an accurate description of how the market actually works.
My perspective as a Canadian dairy farmer
I have no problem acknowledging that supply management protects part of the Canadian dairy market. That is the point of the system.
What I object to is pretending that protection means there is no foreign competition or no access for American dairy products. Canadian farmers limit their own production under quota while successive trade agreements have permanently opened additional shares of our domestic market to imports.
If we are going to debate whether Canada should grant the United States more dairy access, then we should debate that question directly. How much more access? In exchange for what? And what happens to the Canadian production that access replaces?
Those are much more useful questions than simply declaring the market closed.
Key takeaways
- Canada’s dairy market is protected, but it is not closed.
- Foreign dairy products enter Canada through tariff-rate quotas under several trade agreements.
- CUSMA gives the United States specific access for milk, cream, butter, cheese, powders and other dairy products.
- Available quota does not necessarily mean the full quantity will actually be imported.
- Canada imported about $1.93 billion in dairy products in 2025 and exported about $560 million.
- High Canadian dairy tariffs generally apply above negotiated quota volumes.
- Additional permanent import access reduces the share of the Canadian market available to domestic production over time.
To understand the broader system, read Supply Management in Canada: How It Works, Benefits and Criticisms. For the trade rules themselves, see CUSMA, Tariff-Rate Quotas and Dairy Trade in Canada.