The Productivity Mega Deduction: the benefits, the risks and the many outstanding questions

On September 15, 2026, the federal government proposed the Productivity Mega Deduction (PMD), which will allow businesses to deduct the full cost of a large range of capital investment.

What changes?

Indeed, about two-thirds of capital investments become admissible.

Calling it a “deduction” understates the scale of the change. Canada already allows accelerated deductions for specific types of assets. What’s new is the proposal’s broad application: immediate expensing would become mainstream, with exceptions for most buildings, certain intangible assets and vehicles, and selected infrastructure and natural-resource assets. Instead of gradually deducting asset costs over time, businesses would be able to deduct the full cost of a broad range of assets in the year they are acquired and put to use. The proposal also reflects an effort to align Canada’s treatment of capital investment more closely with similar measures in the United States. Announced as a permanent feature of the tax system, it represents a lasting shift in how business investment is taxed.

Why does this matter? The objective is to drive new business investment by reducing marginal effective tax rates. In other words, if a company is investing now, being able to deduct the full cost from its taxable income right away will reduce how much tax it faces in that year.  Finance Canada estimates the fiscal cost of this measure to be $36 billion over five years.

The Government’s intent to attract large, fresh investment through this measure is reinforced by a complementary administrative measure they also announced in September. They directed the CRA to prioritize advance income tax rulings requests where they represent $1 billion or more in new investments planned in Canada. These rulings provide binding confirmation of how tax law applies to proposed transactions, giving investors greater certainty and helping them plan.

What could it achieve?

Tax incentives can support investment, but they cannot address every barrier to Canada’s competitiveness. In the early 2000s, the federal government lowered corporate tax rates and reduced differences in tax treatment across sectors, aiming to encourage investment and improve Canada’s international competitiveness. The Mega Deduction takes a different approach by offering more favourable treatment to qualifying investments.

The measure’s strength is that it lowers the upfront cost of eligible investments, which could encourage businesses to move ahead sooner or consider new investments. If the goal is to give business investment a near-term boost, it is a reasonable approach. This is why the government says it will support a “Canadian investment supercycle.”

But there are some risks.

The measure may steer investment toward assets that offer the largest tax advantage, which may not be those that contribute most to productivity. Bringing deductions forward generally provides a greater timing benefit for assets that would otherwise be written off more slowly.

The measure also favors industries that are capital intensive compared to labor intensive, like the service industry.  The actual additional benefit thus depends on a combination of factors.

Although the measure is permanent, its benefit comes from bringing tax deductions forward. Businesses that claim the full cost now will have fewer deductions available later, generally shifting tax payments into the future. The measure offers less immediate help to businesses with neither current profits nor past taxes to recover. Plus, unincorporated businesses face restrictions on using it to create a loss. Start-ups may still benefit as they become profitable, but businesses able to use the deduction immediately or obtain a refund are better placed to capture its full financial value.

So, we have questions.

Given these trade-offs, how much additional investment should we expect from the Mega Deduction? The government estimates that the measure could increase economic output by up to roughly $22 billion a year, on average over 10 years. But how much more would businesses invest because of the deduction, compared with what they would have invested without it? The federal government needs to be clear about how much investment they expect will be new, what would have happened anyway and what would simply happen sooner. Publishing the assumptions and evidence behind its estimates would help Canadians assess whether the expected gains justify the cost.

Who can benefit, and what choices will the measure influence?

The Mega Deduction will help many types of businesses move ahead with investments by reducing their immediate tax costs on qualified investments. There are, however, areas where clear answers would help establish how broadly those benefits will be shared, and the real impact they will provide.

Can smaller and newer businesses make full use of the measure?

What happens when a business does not earn enough in the year it invests to use the full deduction? Why do the rules differ depending on whether the business is incorporated, and could they better support businesses whose earnings fluctuate from year to year?

Does the measure favour some investments or financing methods over others?

Do some types of investment benefit more than others, especially when businesses can also deduct borrowing costs or claim tax credits?  Could these differences steer investment away from its most productive uses?

Could permanent expensing make the tax system simpler?

Is there an opportunity to consolidate CCA classes and simplify reporting for eligible assets?  While there is a need to preserve the rules for existing balances and asset sales, the PMD presents an opportunity to simplify the capital cost allowance system.

Will the benefits support additional productive capacity?

What safeguards address repeated transfers of existing assets or arrangements designed primarily to obtain deductions? Could differences in businesses’ ability to use the deduction encourage acquisitions or restructuring, and what would that mean for competition?

How much investment would happen without the incentive?

What assumptions has the government made about interest rates, the Canadian dollar and the availability of skilled workers, and how would changes in these conditions affect the investment it expects the measure to generate?

The measure offers a reasonable way to support investment at a time when Canada needs it. Its longer-term fiscal cost will depend partly on taxes collected later as earlier deductions are exhausted, and on any additional economic activity it generates. To assess that trade-off, the government should publish a clear costing and evaluation framework, explain how businesses unable to use the deduction immediately will be treated, and commit to reporting publicly on investment, productivity and access to the benefit.