Ottawa’s new Productivity Mega Deduction lets mining companies write off most mine construction and development costs in full in the first year, a change that leaves the after-tax economics in earlier Canadian project studies out of date.
The Department of Finance released draft legislation for the measure on Tuesday, extending permanent immediate expensing to roughly two-thirds of capital investment in Canada. Finance Minister François-Philippe Champagne called it “one of the most significant changes to Canada’s business tax system in half a century.”
Mine buildings, mills and equipment fall under capital cost allowance Class 41.2, deducted at 25% a year on a declining balance. Pre-production mine development and the cost of acquiring Canadian mineral properties count as Canadian development expense, deductible at 30% a year.
Sponsored · Selkirk Copper Mines
Under the draft rules, qualifying assets acquired on or after September 15 can be written off in full in the year they become available for use. Canadian development expense incurred from that date, including amounts renounced under newly signed flow-through agreements, is fully deductible in the year it is incurred.
The change does not increase the total amount a company can deduct over a mine’s life, but it moves those deductions forward.
RELATED: Canada Will Let Miners Immediately Write Off Development, Property Costs For Tax
At a 25% declining-balance rate, about 6% of an asset’s cost remains undeducted after 10 years, before the half-year rule is applied. Under the new rules, the full cost of a build can be deducted once the assets are in use, creating a pool that shelters early production income from federal tax.
Discounted cash flow models weight those early years most heavily. Projects modeled under the older schedule should therefore see higher after-tax net present value and internal rate of return and a shorter payback. Pre-tax figures are unaffected.
The gap will be narrower for studies that already modeled the Accelerated Investment Incentive reinstated in Budget 2025, which raised first-year deductions on both mine assets and development expense.
Costs incurred before September 15 keep their existing treatment, which limits the benefit for projects already under construction. Industrial mineral mines are excluded, and mines held abroad by Canadian-listed companies are taxed in their host countries.
The federal documents do not say whether provinces will match the change, and provincial mining taxes operate under separate rules.
The measures remain in draft form. Finance estimates the deduction will cost $36 billion over five years and cut Canada’s marginal effective tax rate on new business investment to 6.4% from 13.0%.
Information for this briefing was found via the sources and the companies mentioned. The author has no securities or affiliations related to this organization. Not a recommendation to buy or sell. Always do additional research and consult a professional before purchasing a security. The author holds no licenses.
