Trade Talks Collapse, 50% Tariffs Take Effect; Carney Vows Retaliation

The breakdown reintroduces cross-border trade risk into North American markets. Investors had begun pricing in a de-escalation after weeks of negotiation. Instead, a three-day summit in Washington collapsed late Friday, and by midnight the US had imposed 50% tariffs on roughly $20bn of Canadian goods.

The Canadian dollar came under renewed pressure after the breakdown. Analysts pointed to a slide toward the low 70s against the US dollar, though that figure should be checked against a primary data feed rather than taken at face value. The currency had rallied during the talks on optimism for a deal.

Steel, dairy and electronics exporters on both sides face the most direct exposure once Canada's retaliatory measures land on September 8. Prime Minister Mark Carney matched the new tariffs "dollar for dollar" in a press conference Saturday. He said Canada would target US steel, dairy and electronics. "You're at war when you get attacked. We got attacked," Carney told reporters, NPR reported. In separate remarks carried by Reuters and CNBC, he called the US decision "a miscalculation" and blamed the collapse on what he termed "uneconomic" and "unfair" demands from Washington.

The tariffs cover about 5% of the total value Canada ships to the US annually. The list includes a wide mix of products, among them wooden hockey sticks, according to CNN. Economists said the tariffs are unlikely on their own to meaningfully affect American consumers, who are already dealing with elevated fuel costs. The larger significance lies in the reopening of hostilities between two economies that had spent months trying to stabilise their relationship.

President Trump had told reporters earlier Friday that negotiators had "pretty much" struck a deal, even as officials from both sides continued working through unresolved issues into the evening, CNBC reported. The gap between that public optimism and the midnight deadline breakdown caught many traders off guard. Several dealers said the sudden shift left them questioning whether a negotiated outcome is achievable in the near term.

US Trade Representative Jamieson Greer placed responsibility squarely on Canada. In a statement, Greer said Canada "declined to finalize the trade deal under the terms agreed earlier this week." He outlined what the shelved offer would have delivered: supply chain coordination on aerospace, cooperation on critical minerals, tighter enforcement against goods produced with forced labour, and the formal opening of USMCA renegotiation talks. Trump added to the exchange overnight on social media, posting that Canada wanted "the benefits of being a State, without being one."

The dispute complicates the broader push to renew the US-Mexico-Canada Agreement. Formal renegotiation talks have already begun between Washington and Mexico City, but discussions with Ottawa have not started. Traders may read Ottawa's absence from that process as a signal of prolonged uncertainty rather than a swift resolution. The bilateral breakdown leaves the USMCA renewal timeline in limbo, with no clear dates for when trilateral negotiations might include Canada.

Energy markets remain a watchpoint given the sector's historic sensitivity to any broadening of tariff scope. Canada supplies about 60% of US crude oil imports. The current tariff list does not include energy products, but analysts at several firms said the risk of expansion cannot be dismissed if the retaliatory cycle intensifies. A widening of the tariff scope to energy would hit Canadian heavy crude producers and US Gulf Coast refiners that process it, dealers said.

For forex market analysis, the Canadian dollar's path depends on whether the dispute deepens. The currency traded near 1.38 against the greenback after the breakdown, several traders said, though the move has yet to test the lows seen during the initial tariff escalation in early 2025. Position data from the CFTC shows speculators have trimmed net short CAD bets in recent weeks, a sign that the breakdown caught some of those positions off guard.

The September 8 deadline for Canada's countermeasures is the next scheduled flashpoint. Both governments appear locked into a retaliatory cycle with no diplomatic channel openly in use. Carney said Canada remains open to talks but will not negotiate under the threat of tariffs. Greer said the US is ready to resume negotiations if Canada accepts the terms that were on the table Friday. No new talks have been scheduled.