Stock Options and the Minimum Tax: The Full Add-Back Costs What a Capital Gain Costs
A stock option benefit on shares that are not from a Canadian-controlled private corporation is taxed the moment the shares are acquired, not the moment they are sold, and for anyone who has just exercised those options, the alternative minimum tax is the rule most likely to land as a surprise. The reason it sounds alarming is specific: paragraph 110(1)(d) of the Income Tax Act, the deduction that halves the taxable amount of an option benefit, is disallowed outright under the minimum tax. That reads like a rule built to single out option holders. The arithmetic says otherwise. For the 2026 tax year, once both filers sit at the same point on the basic personal amount grind, an option benefit and an ordinary capital gain of the same size produce identical federal minimum tax, to the cent.
This piece works through why that is true, where the minimum tax actually starts to bite, what one exercise looks like in full, and where the real cost of exercising and holding sits, which turns out not to be the minimum tax at all.
That acquisition-year timing has a carve-out. Under subsection 7(1.1), for an arm’s-length employee of a Canadian-controlled private corporation, paragraph 7(1)(a)’s reference to “the taxation year in which the employee acquired the securities” is read instead as “the taxation year in which the employee disposed of or exchanged the securities.” For that employee, nothing is taxed, and nothing is added back, at exercise. The rest of this piece addresses the ordinary case, a non-CCPC employer, where the benefit and everything below arise in the year of acquisition.
The benefit lands at exercise, and the deduction only touches taxable income
Under paragraph 7(1)(a) of the Income Tax Act, an employee is deemed to receive a benefit equal to the amount by which “the value of the securities at the time the employee acquired them exceeds” what the employee paid, a rule set out at Justice Laws, section 7. For shares that are not from a Canadian-controlled private corporation, that benefit is fixed at acquisition, and nothing that happens to the shares afterward changes it.
Paragraph 110(1)(d), marginal note “Employee options,” lets a taxpayer deduct “an amount equal to 1/2 of the amount of the benefit deemed by subsection 7(1) to have been received by the taxpayer in the year in respect of a security (other than a security that is a non-qualified security).” That deduction is read against Justice Laws, Income Tax Act section 110, and it matters that it sits in Division C: it reduces taxable income, not net income. That distinction is small on the regular return and becomes the only place the minimum tax treats an option holder differently from a shareholder, further down.
That non-qualified-security carve-out has teeth only against large, non-CCPC employers. Under subsection 110(1.3), the annual vesting limit in subsection 110(1.31) applies where the employer is a “specified person”: not a Canadian-controlled private corporation, and with revenue above $500 million, measured on consolidated group revenue where the group prepares consolidated financial statements and on the company’s own gross revenue where it does not. Subsection 110(1.31), marginal note “Annual vesting limit,” then deems a proportion of the securities to be “non-qualified securities” once the grant-date fair market value of everything vesting in the same year, across agreements with that employer, passes $200,000. Above that $200,000 annual limit, there is no paragraph 110(1)(d) deduction at all, so there is nothing for the minimum tax to add back on that portion, and the regular tax on it is correspondingly higher.
Why the minimum tax puts the deduction back
Paragraph 127.52(1)(h) sets out “the only amounts deductible under sections 110 to 110.7” that are allowed to survive into adjusted taxable income: the amount under 110(2); 7/5 of amounts under 110(1)(d.01) and 110.6(2)/(2.1); 110(1)(f) at half of subparagraph (f)(v); half of 110.7(1); 110(1)(g); and twice the amounts under 110.61(2) or 110.62(2), set out in full at Justice Laws, section 127.52. Paragraph 110(1)(d) does not appear on that list. It is not denied by any specific provision aimed at stock options. It is simply absent from a closed list, and that absence is what disallows it.
The option deduction is one entry on a list that reaches well beyond options. For a fuller picture of the other deductions the minimum tax puts back, including dividends, donations, carrying charges and the lifetime capital gains exemption, see our explainer on the rest of what the minimum tax puts back.
The mechanism that executes the add-back is CRA Form T691. Line 28, under the heading “Security options deduction under paragraph 110(1)(d) included on line 24900 of your return,” picks up the “Total of all amounts in boxes 39 and 91 of your T4 slips.” Line 29 adds any deferred benefits reported on Form T1212, line 30 totals lines 28 and 29, line 32 nets off the donated-share reduction that line 31 applies, and line 33 adds the result into the running base that becomes adjusted taxable income, exactly as shown in Form T691 (2025). The add-back is the full deduction, not a partial one. The form’s only partial relief, a 40% reduction on line 31, applies solely to gifts of publicly listed securities acquired under a security option plan. That is the donation route, and it has no bearing on an ordinary exercise.
The equivalence, in dollars
With other income held at $60,000 and at $120,000, here is the federal additional minimum tax for 2026 on an option benefit against an ordinary capital gain of the same size, with nothing else sheltering it:
| Amount | Option benefit | Capital gain | Difference |
|---|---|---|---|
| Other income $60,000 | |||
| $400,000 | $0.00 | $0.00 | $0.00 |
| $600,000 | $6,366.78 | $6,366.78 | $0.00 |
| $1,000,000 | $22,366.78 | $22,366.78 | $0.00 |
| $2,000,000 | $62,366.78 | $62,366.78 | $0.00 |
| Other income $120,000 | |||
| $400,000 | $0.00 | $0.00 | $0.00 |
| $600,000 | $0.00 | $0.00 | $0.00 |
| $1,000,000 | $14,866.78 | $14,866.78 | $0.00 |
| $2,000,000 | $54,866.78 | $54,866.78 | $0.00 |
The two columns match because of how each figure enters the minimum tax base. Paragraph 127.52(1)(d) reads the capital gains inclusion fraction as “1/1,” so a capital gain enters the base at its full amount. An option benefit enters at its full amount too, because Form T691 line 28 puts the halved deduction straight back. Both are taxed at half their value on the regular return. Given the same two inputs, the minimum tax calculation cannot tell them apart. The reason a capital gain is taxed at half in the first place, and why that matters here, is covered in our guide to how investment income is taxed in Canada.
There is one place the two cases diverge, and it is small. Because the 110(1)(d) deduction reduces taxable income rather than net income, an option holder shows a higher net income than a shareholder with an identical economic gain, which grinds the basic personal amount down harder. At $40,000 of other income and a $400,000 amount, the option holder’s net income is $440,000 against a basic personal amount of $14,829, while the shareholder’s net income is $240,000 against a basic personal amount of $15,218.35. The resulting minimum tax is $127.50 for the option holder and $154.75 for the shareholder. The grind raises both the regular tax and the minimum amount, and the regular-tax effect is simply the larger of the two, which is why the option holder’s minimum tax comes out lower while their total federal tax for the year is higher, not lower.
Where the bill starts
The smallest option benefit at which federal minimum tax arises at all, for 2026 and with the basic personal amount as the only credit claimed, depends on how much other income is already on the return:
| Other income | Benefit at which minimum tax first arises |
|---|---|
| $0 | $345,543 |
| $60,000 | $440,831 |
| $120,000 | $628,331 |
| $200,000 | $878,331 |
The threshold rises as other income rises, which runs against the intuition that a bigger salary means more exposure. More salary means more regular tax, and the minimum amount has to exceed the regular figure before anything is owed on top. There is no single dollar threshold that applies across the board, and every other credit or deduction claimed moves it as well.
One exercise, worked in full
Take one example: a 2026 Ontario resident with a $120,000 salary, one exercise producing a $1,000,000 benefit under subsection 7(1), and the basic personal amount as the only credit claimed. This is one filer’s numbers, not a forecast of what any particular reader will pay.
| Line | Amount |
|---|---|
| s.7(1)(a) employment benefit | $1,000,000.00 |
| s.110(1)(d) deduction, one half | -$500,000.00 |
| Net income (line 23600) | $1,120,000.00 |
| Taxable income | $620,000.00 |
| Regular federal tax | $176,499.99 |
| T691 line 28, deduction added back | $500,000.00 |
| Adjusted taxable income | $1,120,000.00 |
| Less the basic exemption | -$181,440.00 |
| Net adjusted taxable income | $938,560.00 |
| At 20.5% | $192,404.80 |
| Credits allowed at 50% | -$1,038.03 |
| Minimum amount | $191,366.77 |
| Federal additional minimum tax | $14,866.78 |
| Ontario additional tax at 24.63% | $3,661.69 |
Federal minimum tax here is 1.49% of the benefit, a small number next to the $176,499.99 of regular federal tax the same exercise already generates. At lower benefit levels against the same $120,000 salary, nothing extra is owed at all: a $600,000 benefit produces $0.00 in additional federal minimum tax, while an $800,000 benefit produces $6,866.78. The Ontario figure comes from CRA Worksheet ON428, which adds 24.63% of the federal additional minimum tax and then recomputes the Ontario surtax on the larger number. An amount on that line also cancels the Ontario tax reduction.
Paid now, recovered fast
Minimum tax paid is not gone. Section 120.2 carries it forward seven years, and the claim in any later year is capped at that year’s regular tax over that year’s minimum amount, as set out in Justice Laws, section 120.2. For the filer above, who paid $14,866.78, here is how that carryforward plays out against salary alone in a later year:
| Later salary | Regular federal tax | Minimum amount | Room per year | Fully recovered after |
|---|---|---|---|---|
| $120,000 | $18,655.25 | $0.00 | $18,655.25 | 1 year |
| $90,000 | $12,342.73 | $0.00 | $12,342.73 | 2 years |
| $60,000 | $6,192.73 | $0.00 | $6,192.73 | 3 years |
All three salary levels recover 100% of the $14,866.78. The minimum amount comes out to nil in each of those years because adjusted taxable income sits below the $181,440 exemption on salary alone. For someone whose income after the exercise returns to an ordinary salary, the minimum tax on that exercise behaves as a timing cost rather than a permanent one.
The real risk is exercising and holding
None of this changes the one fact that actually matters once non-CCPC shares are in hand: the benefit is taxed at exercise regardless of what the shares do afterward. On the worked filer above, federal tax for the year comes to $191,366.77: regular federal tax of $176,499.99 plus the federal minimum tax top-up of $14,866.78. That is the minimum amount itself, as it has to be once the minimum tax binds, and it does not move if the stock falls. Ontario’s additional tax of $3,661.69 sits on top of it.
If the shares then fall 70%, leaving $300,000 of value, that $191,366.77 of federal tax is 63.8% of what remains. Regular tax alone, at $176,499.99, is already 58.8% of that reduced value on its own. Minimum tax alone, at $14,866.78, is 5.0%. Taking the shares to have been worth $1,000,000 when they were acquired, which is where a benefit of that size comes from when the exercise price is nil, the fall itself produces a capital loss of $700,000, half of which, $350,000, is an allowable capital loss. Under paragraph 3(b), income for the year includes the amount “if any, by which” taxable capital gains exceed allowable capital losses, a formula set out at Justice Laws, section 3 that floors the calculation at nil. That loss can only net against taxable capital gains. It cannot reach the subsection 7(1) employment benefit that already generated the tax bill.
Of the 63.8 percentage points of remaining value consumed by federal tax in that scenario, 58.8 points come from regular tax alone. The exercise-and-hold problem is overwhelmingly a regular-tax problem, not a minimum-tax one.
Holding the shares also changes their cost base, and that is why the fall above is a capital loss rather than a second tax bill. Paragraph 53(1)(j) adds the amount of the section 7 benefit to the adjusted cost base of the shares, per Justice Laws, section 53, so the cost base steps up to what the shares were worth on acquisition and only the decline from there is a loss. Working out that number on a later sale is its own exercise, and our guide to how the cost base works after a stock option exercise picks it up.
Disclaimer: The content on bestcanadianstocks.ca is for informational and entertainment purposes only and does not constitute financial advice. Past performance is not indicative of future results. Always consult a qualified financial advisor before making investment decisions. Subsection 7(1), paragraph 110(1)(d), paragraph 3(b), paragraph 111(1)(b), paragraph 127.52(1)(h) and section 120.2 are quoted from the Income Tax Act on Justice Laws, act current to September 21, 2026 and last amended June 18, 2026. The add-back lines 28 to 33, the 40 percent donation relief on line 31, the 20.5 percent rate and the basic exemption are from CRA Form T691 for 2025, the latest published edition. The 2026 basic exemption of $181,440, the bracket thresholds and the basic personal amounts of $14,829 and $16,452 are from the CRA’s Indexation adjustment for personal income tax and benefit amounts. The Ontario 24.63 percent step is from CRA Worksheet ON428 for 2025. Every dollar figure, threshold, curve and percentage is our own arithmetic on those sources, federal income tax only except where Ontario is named, computed with the basic personal amount as the only credit. Subsections 7(1.1), 110(1.3) and 110(1.31) and paragraph 53(1)(j) are from the same consolidation. The Ontario tax reduction point is from Form ON428 (5006-C) for 2025. Justice Laws and CRA documents retrieved October 15, 2026.
