Hundreds of Canadian manufacturers face sharply higher U.S. steel and aluminum duties that could jeopardize revenue and force output cuts, officials said.

The change matters because it targets a broad swath of the supply chain, from sport‑and‑all‑terrain vehicle makers to kitchen‑cabinet producers, and puts an estimated **hundreds of millions of dollars** of sales at risk, potentially reshaping cross‑border trade flows.

Manufacturers across Canada, including producers of tools, moulds, transport trailers, and kitchen cabinets, are among those cited as affected by the new rules[1]. The industry group representing these firms estimates that **hundreds** of companies could see profit margins squeezed as duties rise[2].

The U.S. altered how it applies metal duties to manufactured goods, increasing tariffs on steel and aluminum components imported from Canada[1]. The new tariff regime was slated to begin on **April six, 2024**[2]; however, a related hike had been postponed on **December 31, 2023** (New Year’s Eve)[3], leading to conflicting reports about the exact start date. The Globe and Mail notes the April six start, while CBC highlighted the earlier postponement, underscoring uncertainty for businesses on both sides of the border.

Industry analysts warn that the higher duties could compel some firms to curtail production, delay investments, or seek alternative suppliers[4]. The potential revenue at risk runs into **hundreds of millions of dollars**[4], a figure that could ripple through related sectors and affect employment in regions dependent on metal‑intensive manufacturing.

Company spokespeople said they are reviewing cost structures and exploring tariff‑mitigation strategies. “We may have to scale back output until the market stabilises,” one manufacturer said, reflecting a broader sentiment of caution among exporters.

**What this means**: The tariff shift signals a tougher U.S. trade stance that will likely increase costs for Canadian manufacturers and may accelerate a search for new markets or domestic sourcing. While the exact financial impact will depend on how firms adapt, the policy change introduces heightened volatility into North‑American supply chains and could prompt policy dialogue between Washington and Ottawa to address the competitive imbalance.

The new rules could jeopardize hundreds of millions of dollars in revenue for Canadian producers.

The tariff increase adds a significant cost layer for Canadian exporters of steel‑ and aluminium‑based goods, likely compressing profit margins and prompting some firms to reduce output or seek alternative markets. The policy also raises the prospect of renewed trade negotiations as both governments weigh the broader economic fallout for the integrated North‑American manufacturing ecosystem.