2024 AMT Reform Canada: Who Actually Pays the Higher AMT Now
The Alternative Minimum Tax has been on Canada's books since 1986. For most of those years it caught a relatively narrow group — taxpayers with very large capital gains, oversized donation strategies, or aggressive use of certain deductions. The 2024 reform changed that. Starting with the 2024 tax year, the AMT rate is higher, the base is broader, and the donation tax credit is halved for AMT purposes — a change that pushed a meaningful number of high-income philanthropic households over the AMT line for the first time. By the 2025 filing season (the first one fully under the new rules), reviewing AMT exposure has become a year-of-event obligation for almost every high-income return.
This post is about what changed, who actually pays AMT now, the mechanics of the federal AMT calculation under section 127.5 of the Income Tax Act, and the three main events that trigger it — large capital gains, large donations of publicly traded securities, and stock option exercises.
Key takeaways
The 2024 reform raised the federal AMT rate from 15% to 20.5% and raised the basic exemption from $40,000 to approximately $173,000 (indexed annually, set at the bottom of the fourth federal bracket).
The AMT base was broadened: capital gains are included at 100% for AMT (vs the regular 50% inclusion), stock option employment benefits are included at 100% (vs the 50% regular paragraph 110(1)(d) deduction being denied for AMT), and the donation tax credit is halved for AMT purposes — only 50% of the regular credit applies.
AMT is the greater of regular tax and the AMT calculation. If AMT exceeds regular tax in any year, the excess becomes an AMT carry-forward that can be applied against regular tax in the next seven years (provided that future year's regular tax exceeds the future year's AMT).
The three events that most often trigger AMT under the new rules: a large capital gain (QSBC sale claiming the LCGE, principal-residence-changeover gain, large investment liquidation), a large donation especially of appreciated publicly traded securities, and a stock option exercise with a significant taxable benefit.
AMT planning under the new rules requires year-of-event modelling — running the AMT calculation alongside the regular tax calculation before the triggering event, not after, to know whether the tax-efficient structure still works.
The rule, in one sentence
Under section 127.5 of the Income Tax Act, every individual taxpayer in Canada calculates regular federal tax and a parallel "minimum amount" — federal AMT at 20.5% × (Adjusted Taxable Income − the basic exemption) less 50% of most personal credits — and pays the higher of the two; the AMT was rewritten effective the 2024 tax year to broaden the adjusted-taxable-income base (100% capital gain inclusion, 50% donation credit haircut, full stock option benefit) in exchange for a higher exemption ($173K vs the prior $40K).
The shift in the donation rule is the change most often missed. Pre-2024, the full donation credit applied for AMT. Post-2024, only 50% applies — meaning a high-income individual making a $500,000 donation can trigger AMT despite the donation credit zeroing out the regular tax. The shape of the trap is exactly that.
How AMT actually works — the simplified calculation
The 2024 federal AMT calculation, schematically:
Start with regular taxable income
Add back AMT-only inclusions:
100% of capital gains (vs the 50% included in regular taxable income → add back the other 50%)
100% of stock option benefits (vs the 50% paragraph 110(1)(d) deduction → denied for AMT)
Limited-partnership losses, employee home relocation, northern residents, certain interest expense
Subtract the basic exemption — approximately $173,000 (indexed annually; tied to the bottom of the fourth federal bracket)
Multiply by 20.5% — the federal AMT rate
Subtract 50% of most non-refundable credits — donation credit halved, dividend tax credit halved, most personal credits at 50%
Result is the federal "minimum amount"
Pay the greater of regular federal tax and the minimum amount
Provinces with their own AMT (notably Ontario) calculate their AMT on top of this; British Columbia and several other provinces don't have a stand-alone provincial AMT but apply provincial rates to the AMT base by extension.
What changed — old vs new AMT side by side
The narrative reasons for each shift:
Higher rate (20.5% vs 15%) reflects an intent to materially close the gap between AMT and the regular-tax marginal rates the system was designed to backstop.
Higher exemption ($173K vs $40K) removes most middle-bracket taxpayers from AMT entirely — the new rules aim more squarely at high earners.
100% capital gain inclusion closes the gap with the regular tax base; if the regular capital-gain inclusion ever rises (the saga around the 2024 capital gains rate change), the AMT base already reflects the higher inclusion.
50% donation credit is a deliberate haircut on the tax-efficiency of large donations, especially those funded with appreciated publicly traded securities under section 38(a.1) (which zeros out the capital gain on donated public securities for regular tax — but the gain is still included at 100% for AMT, and the credit is halved).
100% stock option benefit inclusion treats the option benefit as ordinary employment income for AMT, denying the paragraph 110(1)(d) 50% deduction that softens the regular-tax hit.
Who pays AMT now — three event clusters
The new AMT rules can be summarised by who they catch:
Event 1: Large capital gains, especially LCGE-claiming sales
The single most common AMT trigger under the new rules is a sale of qualified small business corporation shares claiming the Lifetime Capital Gains Exemption. The LCGE reduces or eliminates the capital gain for regular tax. For AMT, however:
The full capital gain (not the 50% taxable portion) flows to Adjusted Taxable Income
The LCGE deduction is significantly restricted in the AMT calculation
The result is that a major QSBC sale at the LCGE limit can generate substantial AMT even when regular tax is near zero
The same structure catches:
Real estate sales where the principal residence exemption is being claimed
Large investment portfolio rebalancing
Estate planning gains realised on a deemed disposition at death
The mechanic: even if regular tax on the gain is small, AMT on the gross-up can be material — and the AMT carry-forward only helps if the next 7 years have high regular tax (which retirees and estates often don't).
Event 2: Large donations, especially of appreciated public securities
Under section 38(a.1), donating publicly traded securities in-kind to a registered charity produces a zero capital gain inclusion for regular tax purposes (the gain is treated as 0%, not the normal 50%). Combined with the full donation tax credit at the top marginal rate, this has long been one of the cleanest philanthropic strategies in Canada.
The 2024 AMT changes hit this strategy directly:
The capital gain on the donated security is still included at 100% for AMT (the zero-inclusion under 38(a.1) is overridden for AMT purposes)
The donation tax credit is only 50% allowed for AMT
The combination can push the donor over the AMT line even when regular tax is reduced to nearly zero by the donation credit
A $1 million in-kind donation of appreciated securities now requires year-of-event AMT modelling. The trap is most acute for one-time large donations (estate-related, business sale-related); regular smaller-scale donors are usually below the threshold.
Event 3: Stock option exercises
For employees of public companies (and certain employees of CCPCs after the 2020 stock option changes), exercising stock options generates an employment benefit equal to the FMV at exercise minus the exercise price. Paragraph 110(1)(d) of the Act allows a 50% deduction from that benefit for regular tax — effectively giving the option exercise capital-gain-like treatment.
The 2024 AMT reform denies the paragraph 110(1)(d) deduction for AMT purposes. The result:
For regular tax: 50% of the option benefit is taxable
For AMT: 100% of the option benefit is in the Adjusted Taxable Income base
The personal-tax rate the employee pays on a large option exercise can effectively rise from the regular blended rate (~26-27% on the deductible portion at the top BC bracket) to the AMT rate (~20.5% federal + provincial on the 100% inclusion)
The intent is to bring stock option exercises closer to ordinary-income tax treatment for AMT. Year-of-exercise planning — vesting timing, partial exercises, sell-to-cover sequences — becomes a real AMT lever.
The AMT carry-forward
AMT paid in a year is not simply lost. The excess of AMT over regular tax becomes an AMT carry-forward under section 120.2(3), usable against regular tax in any of the next seven taxation years — but only to the extent that regular tax in the future year exceeds AMT in that future year.
In other words: AMT is essentially a timing tax, not a permanent tax, provided the taxpayer has sufficient future regular tax to absorb the carry-forward. In practice:
For working-age taxpayers with continuing high income, the carry-forward usually gets used up within a few years — AMT functions as a deferral, not a true extra tax
For retirees, estates, and one-time-event taxpayers whose future income is materially lower, the carry-forward may expire unused — AMT becomes a permanent extra tax
For estates triggering AMT on a deemed disposition at death, the carry-forward dies with the taxpayer (cannot transfer to beneficiaries)
The retiree/estate scenario is where the AMT reform causes the most real cost: the carry-forward mechanism that softens the blow for working-age earners doesn't help someone whose future regular tax is going to be small.
Planning around the new AMT
Year-of-event modelling is now standard for any high-income return with one of the three trigger events. Specific levers:
Spread events across years. A $2 million capital gain split across two tax years often produces lower combined AMT than the same gain in one year, because the basic exemption applies each year.
Time donations to match high-income years. Donations in years with substantial regular tax absorb their credits efficiently. Donations in low-income years (post-retirement, sabbatical) may trigger AMT.
Stage option exercises. A large stock option grant exercised in tranches over several years often produces lower combined AMT than a single-year exercise.
Use the AMT carry-forward strategically. Concentrating regular-tax income in years following an AMT event can absorb the carry-forward before it expires.
Reconsider donation timing for one-time large gifts. A planned-giving structure (charitable remainder trust, donor-advised fund) may smooth the credit across multiple years more efficiently than a single-year donation under the new rules.
These decisions hinge on multi-year tax modelling. They are not back-of-envelope calculations under the new rules.
When AMT modelling lands on Modern Axis
Modern Axis CPA runs AMT projections as part of any planning engagement involving a likely trigger event — a planned business sale claiming the LCGE, a one-time large charitable gift, a stock option exercise, or any major capital realisation. The Tax Planning & Compliance service covers the annual review; multi-year AMT modelling for one-time events is its own scoped engagement. For US persons in Canada, AMT interacts with the foreign tax credit calculation in non-trivial ways — running US tax and Canadian AMT together is the only way to know the true net cost.
Frequently asked questions
What changed with the 2024 AMT reform?
The federal AMT rate rose from 15% to 20.5%. The basic exemption rose from $40,000 to approximately $173,000 (indexed to the bottom of the 4th federal bracket). The AMT base broadened to include 100% of capital gains (vs 50% regular), 100% of stock option benefits (vs the 50% paragraph 110(1)(d) deduction allowed), and only 50% of the donation tax credit (vs the full credit pre-reform). The intent is to focus AMT more squarely on high-income taxpayers using credit-driven tax-efficient strategies.
Who actually pays AMT now?
Mainly three groups: high-income individuals with large capital gains (especially QSBC sales claiming the Lifetime Capital Gains Exemption), high-income philanthropic donors making large gifts of appreciated publicly traded securities, and employees exercising stock options with significant taxable benefits. Middle-income taxpayers are largely below the new $173K threshold.
Is AMT a permanent tax?
Not for taxpayers with sustained high regular-tax income — the excess of AMT over regular tax becomes a carry-forward that can be applied against regular tax in the next 7 years. 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.
How is the donation tax credit affected?
Under the 2024 reform, only 50% of the donation tax credit is allowed for AMT purposes. The full credit still applies for regular tax. The practical effect: a large in-kind donation of appreciated publicly traded securities — which under section 38(a.1) has zero capital gain for regular tax — can still trigger AMT because the gain is included at 100% for AMT and the credit that would otherwise wipe out the tax is halved.
Does AMT apply to corporations?
No. AMT applies only to individuals (including individuals filing as sole proprietors, trustees, and certain trusts under specific conditions). Corporations are not subject to AMT in Canada.
How is the LCGE affected by AMT?
The LCGE deduction is significantly restricted for AMT purposes. A QSBC sale claiming the full LCGE generates very little or no regular tax — but for AMT, the full capital gain flows to Adjusted Taxable Income with limited LCGE relief, and the AMT can be substantial. Sellers planning a QSBC exit should model AMT alongside regular tax before the sale.
When should I model AMT?
Before any one-time triggering event — a planned business sale, a large charitable gift, a stock option exercise, a deemed disposition at death (estate planning). Year-of-event modelling lets you sequence the event(s) and decide whether to spread them across multiple years. The carry-forward mechanic only helps when future regular tax is meaningful, so the most expensive AMT cases are events whose future-year regular tax is small.
Are stock options now taxed like ordinary income?
For AMT purposes, effectively yes — the paragraph 110(1)(d) 50% deduction is denied for AMT, so the full option benefit flows to ATI. For regular tax, the 50% deduction is still available where the option meets the conditions. Employees expecting to exercise material options should model the AMT impact in the year of exercise.
This is a general overview of how the 2024 AMT reform works for Canadian individuals, not advice for your specific tax situation. AMT modelling turns on facts not covered above — exact ATI inclusions, provincial AMT (Ontario has its own), the carry-forward absorption profile in future years, and the interplay with foreign tax credits for cross-border taxpayers. Modern Axis CPA can run AMT projections for any planned trigger event — but the analysis is taxpayer-by-taxpayer and depends on multi-year income forecasting.