Immediate write-off for Canadian Development Expenses may improve flow-through financing economics and reduce dilution for development-stage mining companies
Canada’s junior mining sector may have gained an important new financing advantage.
On September 15, 2026, Prime Minister Mark Carney announced the federal government’s proposed Productivity Mega Deduction, a broad tax incentive intended to stimulate new business investment across the Canadian economy.
For the mining sector, one of its most significant provisions is the proposed immediate deduction of 100% of eligible Canadian Development Expenses, or CDE, incurred on or after September 15, 2026.
Canadian mining companies have traditionally relied heavily on flow-through shares to finance exploration. However, as a mineral project advances beyond early exploration into resource definition, engineering, permitting, infrastructure and mine development, an increasing proportion of its spending may be classified as CDE rather than Canadian Exploration Expenses, or CEE.
Advertisement
Historically, CDE has generally been deductible at 30% annually on a declining-balance basis. Under the proposed measure, eligible CDE could instead be deducted immediately.
That change could materially increase the tax value of eligible CDE flow-through shares and strengthen the financing options available to development-stage Canadian mining companies.
Potentially Better Financing Economics
Flow-through shares allow qualifying resource expenditures to be renounced by a mining company to investors, who may then deduct those expenses for tax purposes, subject to the applicable rules.
The larger and earlier the available deduction, the greater its potential value to eligible investors.
If the proposed CDE measure results in investors assigning a higher value to CDE flow-through shares, mining companies may be able to issue those shares at stronger premiums to their prevailing market prices. Raising capital at a higher price means issuing fewer shares to secure the same amount of funding, potentially reducing dilution for existing shareholders.
Advertisement
For junior miners, dilution is not a secondary concern. Exploration and development companies frequently operate without revenue and must repeatedly access the equity markets as they advance their projects. Every improvement in financing efficiency can help preserve a company’s capital structure and direct more investor capital toward work in the ground.
The measure could be particularly relevant for companies moving through the difficult middle stage between mineral discovery and a formal construction decision. This period can require substantial spending on technical studies, underground development, site access, infrastructure and other activities that may not fall within traditional exploration-expense classifications.
The Department of Finance states that immediate expensing would be available for Canadian Development Expenses incurred on or after September 15, 2026. The measure remains a federal proposal supported by draft legislative amendments and will require implementation through the legislative process.
From Discoveries to Mines
Canada does not lack mineral potential. The greater challenge has often been financing projects through the lengthy and capital-intensive process required to turn a discovery into a producing mine.
The federal government is positioning the Productivity Mega Deduction as part of a broader effort to attract capital into mining, critical minerals, energy, infrastructure and other strategic industries.
Advertisement
The proposed deduction would expand immediate expensing from approximately 15% of capital investment to more than 65%. Ottawa estimates that Canada’s marginal effective tax rate on new business investment would fall from approximately 13% to 6.4%, compared with a stated U.S. rate of 16.9%.
“Canada has what the world wants,” Carney said. “We’re an energy superpower with the most educated workforce in the world and rock-solid fiscal strength. We are capitalising on these strengths and making Canada the best place in the world to invest.”
The Prime Minister added that the government is sending a clear message internationally: “Canada is building big. Build with us.”
The announcement came during the inaugural Canada Investment Summit in Toronto, where the federal government reported nearly $500 billion in new investment and financing commitments. Several of those commitments specifically include mining, critical minerals, energy and related infrastructure.
TD Bank committed to provide $150 billion in financing across five strategic sectors, including critical minerals and resources, while BMO committed to invest and mobilize $70 billion in areas that include mining and critical minerals. The government also announced approximately $140 million through the Canada Growth Fund to support Generation Mining’s permitted Marathon copper-palladium project in northwestern Ontario.
Advertisement
A Meaningful Tool—But Not a Complete Solution
The proposed CDE deduction will not eliminate the risks facing junior miners. Companies must still demonstrate project quality, credible management, responsible capital allocation and a realistic path through permitting and development.
Nor does a tax incentive automatically create investor demand. Commodity markets, risk appetite and company-specific fundamentals will continue to determine whether a junior can successfully raise capital.
Nevertheless, the measure addresses a genuine weakness in Canada’s mining-finance system: the funding gap between successful exploration and mine construction.
Flow-through financing has long helped make Canada one of the world’s leading jurisdictions for mineral exploration. Extending a stronger tax advantage to qualifying development expenditures could help more Canadian projects advance beyond discovery.
Finding the minerals is only the beginning. Financing the work required to develop them is what ultimately converts geological potential into operating Canadian mines.
Advertisement
Sources: Department of Finance Canada — Productivity Mega Deduction backgrounder; Office of the Prime Minister; Canada Investment Summit announcement.
This article is for informational purposes only and does not constitute investment, tax or legal advice. The proposed measures remain subject to legislation, detailed tax rules and individual eligibility.
