CUSMA Review Deadline Looms as US Tariff Skirmishes Keep Canadian Exporters on Edge

The Canada-United States-Mexico Agreement is rapidly approaching its first formal review trigger on July 1, and the lead-up has been anything but calm. New US tariffs on Canadian mushrooms took effect in mid-May, the Trump administration has continued to push aluminium and steel producers to move operations south, and senior US officials have publicly identified Canada and China as the only two countries that have retaliated economically against the United States in the past year.

For Canadian exporters, the political volatility comes on top of an already complicated trading environment. A 10 per cent temporary import surcharge introduced by Washington under Section 122 of the Trade Act of 1974 continues to weigh on goods that do not qualify under USMCA's product-specific rules. Canadian companies that have invested in compliance documentation are largely shipping duty-free, but the threat of new measures continues to overshadow business planning.

The Carney government has so far walked a careful line, retaliating where it has felt it must but also keeping diplomatic channels open. The next six weeks will determine whether the relationship slides into more open hostility or stabilises ahead of the formal review process.

What's happening at the border

The new tariffs on Canadian mushrooms, which took effect in mid-May, are the latest in a series of targeted measures the United States has imposed since the start of the trade dispute. While the dollar value of the mushroom trade is small relative to overall bilateral commerce, the move underlines Washington's willingness to use narrow product-specific tariffs as both economic and political tools.

The broader 10 per cent temporary import surcharge has been the more economically significant measure. The surcharge was introduced following a Supreme Court ruling earlier this year that limited the use of emergency trade powers, and has effectively replaced an earlier set of tariffs imposed under the International Emergency Economic Powers Act. The new structure is set to expire after 150 days but can be renewed, leaving Canadian exporters facing significant uncertainty.

Canadian goods that meet USMCA's product-specific rules can enter the United States largely duty-free, which has placed a premium on compliance work. Many Canadian companies have invested heavily in certifications and documentation, but smaller exporters in particular have struggled with the administrative burden.

The July 1 deadline

USMCA includes a built-in joint review every six years, beginning on July 1, 2026. The review process is designed to give all three signatories an opportunity to either confirm the agreement for another 16-year term or to negotiate amendments. Failing that, the agreement enters a 10-year window of annual reviews, with any party able to trigger an exit if no consensus is reached.

Analysts at major investment banks have downgraded their assessment of the likelihood that the agreement will be renewed in its current form. Jefferies has placed the odds of renewal at roughly 10 per cent, with a 75 per cent probability that the agreement slides into the decade-long annual review structure. Negotiations between the three governments have not produced a clear path forward, and the Canadian side has so far seen limited engagement from Washington's senior trade officials.

For Canada, the stakes are profound. The United States remains by far the country's largest trading partner, accounting for roughly three-quarters of merchandise exports. Even a partial unravelling of USMCA would have significant implications for sectors as varied as automotive manufacturing, agriculture, energy and forestry.

How Ottawa is responding

The Carney government has pursued a multi-track approach. On one front, it has retaliated against specific US measures with its own targeted tariffs, including on goods that hit politically sensitive US districts. On another, it has continued to engage with Washington at the political and technical levels, including through meetings between Prime Minister Mark Carney and senior US officials.

The federal government has also expanded its support for Canadian exporters, with new financing through Export Development Canada and additional resources to help small and medium-sized businesses navigate compliance. Programs aimed at diversifying Canadian exports beyond the United States have also received fresh funding, building on the Indo-Pacific Strategy and the Canada-European Union trade relationship.

Quebec Premier Christine Fréchette met with US Trade Representative Jamieson Greer earlier this month, part of a wider trend of provincial governments asserting themselves on the trade file. Ontario, Alberta and British Columbia have all stepped up their direct outreach to US states and federal officials, often in coordination with Ottawa.

Industry-level impact

The auto sector remains the most exposed Canadian industry. Cross-border production lines, particularly between Ontario and Michigan, are deeply integrated, and even modest tariff actions can cause significant disruption. Canadian assembly plants have continued to operate at reduced production levels in some cases, with several manufacturers signalling that any further escalation would force harder decisions.

Aluminium and steel producers are facing direct pressure from a separate set of US measures. The Trump administration has offered Canadian and Mexican aluminium and steel companies immediate tariff relief in exchange for commitments to expand operations in the United States, a proposal that has been rejected by the Canadian industry and federal government as an attempt to relocate strategic production capacity.

Agricultural producers are watching closely. The mushroom tariff is a relatively small measure, but it has reminded growers across multiple sectors that targeted actions can appear with limited warning. Canadian beef, pork, dairy, and grain exporters are all assessing exposure to potential further measures.

The China dimension

One of the persistent themes in US-Canada discussions has been Washington's concern that Canada could become a back door for Chinese exports into the North American market. Trump's senior trade officials have publicly identified China and Canada as the only two countries that have retaliated economically against the United States, framing Canadian responses to US tariffs as evidence of broader hostility.

Canada has its own significant trade dispute with China, including over electric vehicles and other strategic sectors, and has imposed tariffs on Chinese imports in response. But Washington has continued to press for tighter Canadian alignment with US measures, including on technology and investment screening.

The Carney government has emphasised that Canada makes its own decisions on trade policy and security, while also signalling continued willingness to coordinate with allies on shared strategic concerns. The balancing act has become a central element of Canadian foreign policy, with implications well beyond the immediate USMCA review.

What it means for Canadians

For consumers, the trade dispute has so far produced relatively modest price impacts, though the cost of certain food products and some manufactured goods has risen as a result of tariff and supply chain effects. Energy prices have been driven more by the conflict in the Middle East than by trade measures, but tariffs on industrial inputs continue to feed through into Canadian producer prices.

For workers, the most acute risks remain in trade-exposed manufacturing sectors. Government programs aimed at supporting affected workers have expanded, but any major escalation would likely overwhelm the existing safety net.

For policymakers, the trade dispute has reshaped multiple aspects of federal strategy, from infrastructure investment to defence procurement to immigration. The Carney government's emphasis on building Canadian capacity and diversifying trade is increasingly being driven by the perception that the long-standing assumption of stable US-Canada economic relations can no longer be taken for granted.

Provincial coordination

Provinces have become increasingly active on the trade file, building on the precedent set by previous federal-provincial coordination during the original CUSMA negotiations. Ontario, Quebec, Alberta and British Columbia have all expanded their direct outreach to US states and federal officials, and the Council of the Federation has emphasised coordinated provincial positions.

Premier Christine Fréchette's recent meeting with US Trade Representative Jamieson Greer, Alberta Premier Danielle Smith's continued engagement with US officials, and Ontario Premier Doug Ford's active US outreach have all reflected the new provincial activism on trade. The federal government has generally welcomed the provincial efforts while retaining its formal authority over international agreements.

The provincial engagement adds capacity to Canadian advocacy in Washington but also creates the risk of inconsistent messaging. Coordination through Global Affairs Canada and the Council of the Federation has been important in maintaining a coherent overall Canadian position.

Long-term strategic implications

The broader question for Canada is whether the past 18 months represent a temporary disruption or a fundamental shift in the structure of the North American economic relationship. Most economic policy analysts believe the answer is some combination of both, with certain elements of the relationship returning to historical patterns while others, particularly around manufacturing supply chains and energy, undergo lasting changes.

The Carney government's broader strategy of building Canadian industrial capacity, diversifying trade relationships and investing in domestic infrastructure reflects an assumption that the trade environment will remain more challenging than in past decades. Federal programs targeting critical minerals, defence industry expansion, and clean energy capacity are all aligned with that strategic outlook.

For Canadian businesses and workers, the adjustment is ongoing. Some sectors have been hit harder than others, and government support programs have helped cushion some of the impact. But the structural changes underway are likely to play out over years rather than months, and the eventual shape of the Canadian economy will reflect those longer-term adjustments.

What's next

The July 1 trigger date approaches without any clear sign of a breakthrough. The Carney government has signalled that it will continue to push for a constructive review while preparing for less favourable scenarios. Provincial governments are coordinating their own outreach, and Canadian business associations have stepped up advocacy in both Ottawa and Washington.

The next six weeks will likely see additional bilateral meetings, possible new tariff actions, and continued political pressure on both sides of the border. For Canadian exporters, the message from federal officials remains a familiar one. Prepare for volatility, invest in compliance, and explore new markets where possible.

The bilateral relationship may eventually stabilise, but the patterns of the past 18 months suggest that any return to the stability of previous decades is unlikely without a significant shift in Washington's broader trade posture. For now, Canadian companies continue to navigate one of the most volatile trading environments in a generation.