On September 16, 2026, Prime Minister Carney unveiled an expanded immediate expensing framework designed to stimulate major projects and capital investment in Canada during the Investment Summit. This new initiative builds upon the existing Productivity Super Deduction introduced in the 2025 Budget.

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The updated policy allows companies to deduct 100% of the depreciation on a broader range of capital assets in their first year of operation, increasing the breadth from the original 15% coverage of capital assets to approximately 65%. This expansion includes essential sectors such as fibre-optic cable, mining properties, oil and gas pipelines, software, research and development, and other critical infrastructure like bridges and roads. By doing so, it aligns with Carney's Major Projects initiatives aimed at enhancing investment in areas like AI, defense, critical minerals, and energy.

In a significant shift, the Mega deduction is now a permanent feature, reducing the financial barriers for capital projects both large and small. The government aims to attract both domestic and foreign investments to advance these initiatives.

The cost of this new framework is estimated at $36 billion over five years, an increase from the $1.5 billion allocated for the previous Super Deduction. Various other accelerated capital cost allowance policies have also been implemented in recent years.

Several key implications arise from this initiative, such as how it interacts with other policies Carney has proposed, its competitiveness compared to the U.S. tax framework, and its effectiveness in driving project initiation. The impact on the Canadian economy and deficit also warrants further analysis.

While the immediate expensing deduction is a notable change, it represents one aspect of the investment equation. Other factors that businesses consider include varying provincial tax rates, additional deductions, tax credits, and overall financing costs. Immediate expensing alone may not dramatically alter investment decisions but can influence them positively, especially when part of broader government strategies aimed at decreasing risks associated with capital expenditures.

The Canadian government is actively competing for international investment, and the immediate expensing framework results in a marginal effective tax rate (METR) of 6.4%, significantly lower than the U.S. rate by 10.5 percentage points. However, the METR analysis is complex. Although the statutory corporate tax rates are somewhat aligned, the U.S. immediate expensing provisions may offer slightly more favorable terms due to looser eligibility criteria.

Investors must consider more than just tax figures; they are likely to be attracted to a comprehensive suite of Canadian policies that are working to mitigate barriers to large-scale projects. The projected economic benefits from the initiative suggest a potential increase in economic activity of between $22 billion and $66 billion over the next several years. The real GDP growth could rise by 0.3% to 0.8% during the uptake period, although the actual impact will depend on how widely businesses adopt the deduction and the industries involved.

The new deduction is projected to add about $7.2 billion to the existing $63 billion deficit for the fiscal year 2027/28. The government maintains a focus on investment-related spending, with an expectation to balance the operating budget the following year. However, rising bond yields are increasing the financial burden of deficit spending, prompting a call for more disciplined spending practices in the future. As the government prepares its upcoming budget, stakeholders await a detailed breakdown of its financial plans.