Canada’s Tariff “Lifeline” May Not Last: Why the CUSMA Exemption Is on Borrowed Time

For all the noise and fury surrounding U.S. President Donald Trump’s renewed tariff offensive, Canada has so far been spared the worst. Manufacturing-heavy industries have taken hits, political rhetoric has intensified, and threats of double-digit tariffs have rattled businesses on both sides of the border. Yet one crucial factor has kept Canada’s economy from sliding into deeper trouble: the CUSMA exemption.

That exemption often overlooked in public debate is the quiet reason why nearly 90 per cent of Canadian goods continue to cross into the United States duty-free, despite a sweeping 35 per cent blanket tariff officially in place. But as the 2026 review of the Canada–U.S.–Mexico Agreement (CUSMA) approaches, this economic safety net looks increasingly fragile.

The danger isn’t theoretical. It’s structural.

CUSMA was designed to eliminate tariffs among North American partners, not to provide loopholes for them. The current arrangement, where CUSMA-compliant goods are exempt from blanket tariffs but not from sector-specific duties on steel, aluminum or softwood lumber, is already a distortion of the agreement’s spirit. It exists largely because it suits Washington’s political calculus for now.

Trade experts warn that this workaround could disappear in the next round of talks. If it does, the consequences for Canada would be severe and lasting. Without the CUSMA exemption, the full weight of U.S. tariffs would fall on Canadian exports, stripping away carve-outs and compliance protections that currently cushion the blow.

That would be more than a short-term shock. It would leave scars.

Economists suggest Canada narrowly avoided a recession in 2025 only because of two developments: the continued CUSMA exemption and Ottawa’s decision to roll back most of its retaliatory tariffs. Remove either pillar, and the outlook darkens quickly. Remove both, and the Canadian economy could face a prolonged period of reduced growth possibly a permanently smaller economic footprint.

The 2026 review is supposed to be exactly that: a review, not a renegotiation. But the Trump administration has repeatedly signalled it sees trade agreements as leverage, not commitments. The message has been blunt deliver concessions, or risk the agreement itself. In that context, the CUSMA exemption becomes a bargaining chip, not a guarantee.

Calling its removal a “nuclear option” may sound dramatic, but the label fits. Ending the exemption would amount to tearing at the fabric of North American trade integration built over decades. It would also deepen costs for U.S. consumers and industries already feeling the sting of higher prices a reality the administration itself appears to be acknowledging after quietly rolling back tariffs on items like coffee and beef.

This growing domestic pressure in the U.S. may ultimately temper Washington’s appetite for all-out tariff warfare. Tariffs are proving to be a blunt tool, inflating prices at home while unsettling supply chains that American manufacturers depend on. There are signs of softening, but there are no guarantees.

Prime Minister Mark Carney has argued that Canada still enjoys the best trade deal of any country with the United States. That may be true today. The question is whether it will remain true tomorrow.

As Canada heads toward the 2026 CUSMA review, complacency would be a mistake. The exemption that has kept the economy afloat is not embedded in stone it is suspended by politics. And politics, as recent history has shown, can change overnight.