Selling a Cottage or a Rental in Canada: Where the Alternative Minimum Tax Fits In
The AMT is a floor under your federal tax. A single large capital gain can pull ordinary tax down toward that floor, and the cottage, the rental and the home you live in each meet it differently.
Can selling a cottage or a rental property trigger Canada’s alternative minimum tax?
It can, because the AMT works as a floor under your federal tax, and a large capital gain is exactly the kind of income that can push ordinary tax below that floor. The floor is 20.5% of your “adjusted taxable income” above an exemption tied to the threshold of the fourth federal bracket, less a basic minimum tax credit. In that adjusted income, 100% of a capital gain counts, while ordinary tax includes only half of it. For the 2025 tax year, CRA’s quick screen says you may have to pay minimum tax if your capital gains (Schedule 3, line 19700) plus certain deductions total more than $177,882.
Source: Income Tax Act ss. 127.5, 127.51, 127.52(1)(d) (Justice Laws, current to 2026-10-19); CRA, Line 41700 – Minimum tax (page modified 2026-01-20)
I’m Arthur Zhao. Picture an owner who holds two properties besides the family home: a lake cottage the family has used for years, and a condo that has been rented out to tenants. Both have gone up in value, and the owner wants to sell one of them first, maybe both. The usual questions come early: what each one will fetch, and how big each capital gain is.
One question tends to come later than it should: how does the year of the sale look to the alternative minimum tax? The AMT is not a separate tax on property. It is a floor under federal income tax, and the two properties, plus the home the family lives in, meet that floor in different ways. This article walks through each property type under the AMT rules in the Income Tax Act. It explains the rules; it does not calculate anyone’s tax, and the actual numbers belong with your accountant.
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The floor, in plain terms
Section 127.5 of the Income Tax Act says that if an individual’s ordinary federal tax for the year is less than their minimum amount, the minimum amount is what they pay (subject to adjustments such as a special foreign tax credit). According to Justice Laws (2026), section 127.51 sets that minimum amount with the formula A(B − C) − D:
- A is 20.5%.
- B is your adjusted taxable income, a modified version of taxable income built under section 127.52.
- C is an exemption: for an individual (other than a trust), the first dollar amount referred to in paragraph 117(2)(d), which is the income level where the fourth federal bracket starts. It is indexed, so it changes each year.
- D is the basic minimum tax credit under section 127.531, which lets only part of your personal credits count (half of most of them, four-fifths of the charitable donation credit).
So the real question in a sale year is not whether AMT “applies to” the property. It is whether your ordinary tax drops below the floor. A large capital gain can do that, because the two calculations treat the gain differently: under paragraph 38(a), ordinary tax includes half of a capital gain, while paragraph 127.52(1)(d) has the AMT calculation read that fraction as 1/1, so the whole gain goes into B.
The AMT base is also more than the gain. Section 127.52 adjusts several deductions, so a sale year that also has large interest costs, past losses or other claims needs to be looked at as a whole.
ℹ️The $177,882 figure is a screen, not a verdict. CRA says that if the total is $177,882 or less you probably do not have to pay minimum tax, and if it is more you may have to, using Form T691. That figure is for the 2025 tax year; the exemption in the formula is tied to the indexed bracket amount in paragraph 117(2)(d), so check the figure for the year you actually sell.
Property one: the cottage
A cottage the family uses itself raises the most straightforward AMT question. Whatever capital gain is left after any principal residence exemption goes into the AMT base at 100%. The rental-deduction limit discussed below targets deductions claimed in respect of a rental or leasing property, so a cottage that has only ever been used by the family gives that rule little to work on. For that cottage, the AMT question mostly comes down to how large the remaining gain is, how it compares with the year’s exemption, and what else is on the return.
The cottage also has an option the rental usually does not: it can be a principal residence. CRA’s principal residence folio (S1-F3-C2) lists a cottage among the housing units it has accepted (¶2.7), and says the unit must be ordinarily inhabited in the year by you, your spouse or common-law partner, a former spouse or partner, or your child (¶2.10). Living in it only for part of the year can be enough, unless the main reason for owning it is to earn income (¶2.11). The catch is the family-unit rule: for 1982 and later years, only one property per family unit can be designated as the principal residence for a given year (¶2.13). Every year you use on the cottage is a year you cannot use on the city home.
Property two: the rental
A rental property’s gain goes into the AMT base at 100%, the same as the cottage. The difference is a second rule that applies only to rental and leasing property.
Paragraph 127.52(1)(b) limits, for AMT purposes, two kinds of deductions claimed in respect of a rental or leasing property: capital cost allowance (paragraph 20(1)(a)) and carrying charges such as interest and financing costs (paragraphs 20(1)(c) to (f)). Under AMT, the total of those deductions is capped at the amount by which your rental income before those deductions, plus your net taxable capital gains from disposing of rental or leasing property, exceeds any rental losses computed the same way. Put simply, CCA and interest cannot create or deepen a rental loss in the AMT calculation beyond what the rental income and rental gains support.
Two points follow from the wording. First, an owner who has been claiming CCA or deducting mortgage interest on the rental may find that some of those deductions do less work in the AMT calculation than in ordinary tax. Second, the cap itself includes taxable capital gains from disposing of rental property, so in the year a rental is sold, the gain also counts toward the room for those deductions. How this nets out depends on the actual figures, which is a job for your accountant.
Prior-year losses get their own treatment. Under paragraph 127.52(1)(i), non-capital and certain other losses carried forward under paragraphs 111(1)(a), (c), (d) and (e) count at only half in the AMT calculation. Net capital losses under paragraph 111(1)(b) follow a separate rule in the same paragraph, so do not assume they get the same half treatment.
⚠️A partial designation leaves a gain that counts in full. If the home or cottage is designated for only some of its ownership years, the remaining gain goes into the AMT base at 100%, the same as any other capital gain.
Property three: the home you live in
The principal residence exemption works at a different point from the AMT. Paragraph 40(2)(b) reduces the gain itself: the gain before the exemption, less the gain multiplied by a fraction whose top number is one plus the number of years designated as your principal residence (if you were resident in Canada in the year you acquired it), and whose bottom number is the number of years you owned it.
Going by how the provisions are built (this is a reading of the statute, not a CRA quote): the exempt portion never becomes a capital gain, so it never reaches the section 38 inclusion fraction, and therefore never reaches the 1/1 reading that the AMT applies. A home designated for every year it was owned leaves no gain for the AMT base. A home designated for only some years leaves a remaining gain, and that remainder counts in full in the AMT base like any other gain.
The designation is made on the return for the year you sell (folio ¶2.15). That is why the cottage and the city home are a joint decision, not two separate ones: dividing designation years between them changes how much gain each sale leaves, in ordinary tax and in the AMT base.
Selling the cottage vs. selling the rental, under the AMT
💡 My own view: an owner selling two properties should look at the tax year each sale lands in, not just the order of sales. The minimum amount is worked out one year at a time, with one exemption (C) per year. Two large gains in the same year stack into the same adjusted taxable income against a single exemption. The same two gains in different years each meet their own year’s floor. That is a reading of the formula, not a promise of a better result, because ordinary tax, the 7-year carryover and the principal residence designation all move at the same time. It is the question I would want an accountant to run before the second listing date is set, not after both deals have closed.
If the floor does bite: the 7-year carryover
Minimum tax paid above your ordinary tax is not simply gone. According to the Income Tax Act (s. 120.2), the excess is an additional tax that you can deduct from ordinary federal tax in any of the 7 following tax years. The deduction in a later year is limited to how much your ordinary tax for that year exceeds your minimum amount for that year. Recovery therefore depends on later years where ordinary tax sits above the floor, which is a fact about your future income, not about the property you sold.
According to CRA (2026), people over the Line 41700 screen complete Form T691, Alternative Minimum Tax, where the calculation is done.
Two edges worth knowing
The year of death. Paragraph 127.55(c) says the minimum tax does not apply to an individual for the taxation year in which the individual dies. If a gain is reported in that final year, the AMT floor is not part of that year’s calculation.
The provincial side. CRA’s Line 41700 page notes that you may also need Form 428, or Form T2203 if you had income in more than one jurisdiction, to calculate additional provincial or territorial tax. For Ontario residents, Form 428 is ON428 (Ontario Tax). This article does not state the Ontario rate or rules for that additional tax; check them with your accountant against the current form.
What to gather, property by property
Bring these to your accountant before you list, so the AMT question is answered with real numbers.
- ☐Find the purchase documents and records of capital improvements, so the gain can be worked out properly.
- ☐List the years you, your spouse or partner, or your children actually used the cottage.
- ☐Note any years it was rented out, even occasionally, and keep the rental records.
- ☐Pull the CCA schedules from past returns, showing what has been claimed.
- ☐Gather mortgage and financing statements showing the interest deducted each year.
- ☐Ask for a list of any non-capital or net capital losses still being carried forward.
- ☐Confirm the years each family member owned and lived in it.
- ☐Ask your accountant to compare designation splits between the home and the cottage, in ordinary tax and under the AMT.
- ☐Estimate the year’s other income, deductions and large donations alongside the sale.
- ☐Ask whether a second sale would land in the same tax year, and how the T691 calculation looks with and without it.
- Income Tax Act, ss. 127.5, 127.51, 127.52, 127.531, 127.55 (Justice Laws, current to 2026-10-19)
- Income Tax Act, s. 120.2 (minimum tax carryover)
- Income Tax Act, s. 38 and s. 40(2)(b)
- CRA, Line 41700 – Minimum tax (2025 tax year)
- CRA, Income Tax Folio S1-F3-C2, Principal Residence
- CRA, 5006-C ON428 Ontario Tax
Selling the Cottage or Rental in Retirement: Will That One-Year Capital Gain Trigger the OAS Clawback or Cut Your GIS? →Adjusted Cost Base & Capital Improvements: How Good Records Cut Your Tax When You Sell a Rental or Cottage →Sold an Ontario Rental at a Loss? The Tax Rules Treat the Land and the Building as Two Separate Losses →The Ontario Selling Blueprint →
Frequently Asked Questions
If I sell my cottage and my rental in the same year, are both gains counted together?
Yes. The minimum amount under section 127.51 of the Income Tax Act is calculated once per tax year, with a single exemption, and both gains go into that year’s adjusted taxable income at 100%. Whether that results in minimum tax depends on everything else on the return, so the T691 calculation needs to be run on the actual figures.
Will my charitable donation still reduce my tax in an AMT year?
Partly. Under section 127.531, the basic minimum tax credit counts four-fifths of the charitable donation credit, compared with half of most other personal credits. A donation still helps in the AMT calculation, just with less weight there than in ordinary tax.
Can I still use my old rental losses against the gain in an AMT year?
Non-capital and certain other losses carried forward under paragraphs 111(1)(a), (c), (d) and (e) count at only half in the AMT calculation (paragraph 127.52(1)(i)). Net capital losses under paragraph 111(1)(b) follow a separate rule in the same provision. Your accountant can show how each kind of loss plays out in your case.
What happens with AMT if the owner dies in the year of the sale?
Paragraph 127.55(c) of the Income Tax Act says minimum tax does not apply to an individual for the taxation year in which they die. A gain reported on that final year’s return is therefore not tested against the AMT floor.
Which form shows whether I owe minimum tax?
Form T691, Alternative Minimum Tax. CRA’s Line 41700 page says you may have to pay minimum tax, and should complete it, if your capital gains (Schedule 3, line 19700) plus certain deductions total more than $177,882 for the 2025 tax year. For Ontario residents, any provincial addition is worked out on Form ON428.
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