06/16/2026
Five things every Canadian high-income taxpayer should know about the **2024 AMT reform**:
**1) The rate is now 20.5% federal (up from 15%) on the broadened AMT base.** The basic exemption is ~$173,000 (indexed annually, set at the bottom of the 4th federal bracket — up from $40,000). The higher exemption keeps most middle-bracket taxpayers out, focusing AMT on high earners using credit-driven tax-efficient strategies.
**2) Capital gains are 100% included for AMT, not 50%.** The regular tax base includes only 50% of capital gains; for AMT, the full gain flows to Adjusted Taxable Income. The Lifetime Capital Gains Exemption is also significantly restricted in the AMT calculation. A QSBC sale claiming the full LCGE can produce minimal regular tax but substantial AMT.
**3) The donation tax credit is HALVED for AMT.** Only 50% of the regular credit applies. The combination of 100% capital gain inclusion + 50% donation credit means a large in-kind donation of appreciated publicly traded securities — which under section 38(a.1) zeros out the capital gain for regular tax — can still trigger material AMT. This is the change that hit high-income philanthropic households hardest in 2024.
**4) Stock options are now taxed like ordinary income for AMT.** Paragraph 110(1)(d) gives a 50% deduction from the option employment benefit for regular tax. That deduction is denied for AMT — the full option benefit flows to ATI. Employees with material stock option exercises should model AMT in the year of exercise.
**5) AMT is a timing tax (mostly).** The excess of AMT over regular tax becomes a carry-forward usable against regular tax in the next 7 years. For working-age earners with sustained high income, AMT usually gets absorbed. For retirees, estates, and one-time-event taxpayers whose future regular tax is materially smaller, the carry-forward may expire unused — making AMT a permanent extra tax.
Full guide — old vs new AMT side by side, the 6-step federal calculation, who actually pays now, and the planning levers for spreading events across years:
https://modernaxis.ca/blog/amt-reform-canada-2024