Capital Gains on a Cottage in Canada: Which Property to Designate
A cottage can be a principal residence. Capital gains on a cottage are sheltered by the same exemption that covers the house you live in all year, and seasonal use does not disqualify it. The trap is elsewhere: a family gets one designation per year, so every year handed to the cottage is a year taken from the house. The obvious way to choose is the wrong way, and below it costs $90,000 of taxable capital gain.
We first reproduced CRA’s own worked examples from Appendix A of CRA Income Tax Folio S1-F3-C2, Principal Residence. Example 1, a married couple with a cottage, gives an exemption of $16,667 and a gain of $28,333 under the usual method, and under the alternative subsection 40(6) method a pre-1982 gain of $4,286 and a post-1981 gain of $24,500, for a maximum total net gain of $28,786. CRA reports $28,333. Example 2, the same facts for a common-law couple, gives $35,000 and $10,000. Every figure matched to the dollar. Sources consulted September 13, 2026.
The mechanics are assumed here rather than re-taught. If the variables are new, our companion piece on how the principal residence exemption formula works covers A, B and C, the plus one year, and the 45(2) and 45(3) elections. This is the other half of the problem: two properties, one designation a year, and which years go where.
A cottage clears the bar more easily than people expect
The condition that worries owners is that the property be ordinarily inhabited in the year, and a place used six weekends a summer sounds like it fails. It does not. Folio 2.11 is explicit: “Even if a person inhabits a housing unit only for a short period of time in the year, this is sufficient for the housing unit to be considered ordinarily inhabited in the year by that person.”
The limit in that paragraph is about purpose, not duration. Where the main reason for owning the unit is to gain or produce income, CRA says short occupancy will not generally make it ordinarily inhabited. Renting for a few weeks does not by itself break the designation, because “a person receiving only incidental rental income from a housing unit is not considered to own the property mainly for the purpose of gaining or producing income.”
One property per family unit per year
Folio 2.13 sets up the whole problem: “For a property to be a taxpayer’s principal residence for a particular year, he or she must designate it as such for the year and no other property may have been so designated by the taxpayer for the year. Furthermore, no other property may have been designated as the principal residence of any member of the taxpayer’s family unit for the year.”
That second sentence applies from 1982 onward, and the family unit is wider than most people assume. It takes in, besides the taxpayer, “the taxpayer’s spouse or common-law partner throughout the year, unless the spouse or common-law partner was throughout the year living apart from, and was separated under a judicial separation or written separation agreement from, the taxpayer”, and “the taxpayer’s children, except those who were married, in a common-law partnership or 18 years of age or older during the year”. Where the taxpayer was themselves unmarried and under 18 during the year, it also reaches their mother and father and their unmarried siblings under 18.
Two dates matter for older properties. Opposite-sex common-law couples are a family unit for 1993 and later tax years, same-sex common-law partners for 2001 and later, unless a joint election was filed for 1998, 1999 and/or 2000.
Spouses cannot split the difference by each designating their own place. Per folio 2.27, if one of them designates a property for any year after 1981, “the other spouse or common-law partner will be able to designate only that same property as his or her principal residence for that year if the rule described in ¶2.13 to 2.14 prevents him or her from so designating any other property for that year.”
The wrong comparison, and the right one
Take two illustrative properties, invented to keep the arithmetic clean rather than drawn from any market. A house bought in 2006 for $420,000 and sold in 2026 for $980,000: a gain of $560,000 over 21 tax years. A cottage bought in 2016 for $300,000 and sold the same year for $720,000: a gain of $420,000 over 11 tax years.
Each cost is treated here as one tidy number. For a cottage it rarely is, being a lot, then a build, then decades of docks and roofs, exactly as in CRA’s example where the cost was $7,000 for the 1975 lot and $13,000 for the cottage built on it. Our adjusted cost base calculator is where to settle that figure, because the allocation below means nothing until it is right.
Ranked by total gain, the house is the bigger problem, $560,000 against $420,000. That is the comparison nearly everyone makes, and it points straight at the house.
But a designated year does not shelter a gain. It shelters one year’s slice of it, out of all the years you owned the property. The price of a year is the gain divided by the years of ownership:
- House: $560,000 over 21 years is $26,666.67 per designated year.
- Cottage: $420,000 over 11 years is $38,181.82 per designated year.
The ranking inverts. By total gain the house wins. By gain per year of ownership the cottage wins, by more than 40 percent a year, because it compressed a comparable gain into half the holding period. That inversion is the decision, and it is why “it is our home, obviously we designate the house” is an expensive instinct.
Eleven tax years are contested here, 2016 through 2026, when both properties were owned. The other 10, 2006 through 2015, are not a choice: the cottage was not in the family’s hands, so those years can only go to the house.
Three ways to split the years
| Allocation | Property | Designated years | B | C | Exemption | Net gain |
|---|---|---|---|---|---|---|
| A: every year to the house | House | 21 | 22 | 21 | $586,666.67 | $0.00 |
| A | Cottage | 0 | 0 | 11 | $0.00 | $420,000.00 |
| B: 10 contested years to the cottage | House | 11 | 12 | 21 | $320,000.00 | $240,000.00 |
| B | Cottage | 10 | 11 | 11 | $420,000.00 | $0.00 |
| C: all 11 contested years to the cottage | House | 10 | 11 | 21 | $293,333.33 | $266,666.67 |
| C | Cottage | 11 | 12 | 11 | $458,181.82 | $0.00 |
Illustrative figures for invented properties, computed September 13, 2026 from CRA’s published rules. Not market data.
Allocation A is the intuition. It erases the house’s gain and leaves the cottage nothing, because a property designated for zero years was never a principal residence, so paragraph 40(2)(b) gives it no exemption at all, not even the plus one. Total net capital gain $420,000.00, taxable $210,000.00.
Allocation B gives 10 contested years to the cottage and keeps the 11th, plus all 10 house-only years, on the house. The cottage goes to nil and the house still shelters $320,000.00. Total net capital gain $240,000.00, taxable $120,000.00.
The gap is $90,000.00 of taxable capital gain. Same properties, same prices, same year, same rules. The only variable is which property got which years.
No tax bill is printed on that $120,000 here, because what it costs depends on your bracket and your province. Our capital gains tax calculator turns a taxable amount into a number for your own situation. The halving above is the inclusion rate, which Guide T4037 states for the most recently completed year: “The inclusion rate for 2025 is 50%.”
Do not give a property one year more than it needs
Allocation C is the opposite mistake. Give all 11 contested years to the cottage and the cottage is still at nil, since 10 already got it there, while the house loses a year worth $26,666.67 of exemption. Total net capital gain $266,666.67, taxable $133,333.33, so $13,333.33 is surrendered for nothing.
Why 10 and not 11 generalises. The cottage needs $420,000 of shelter at $38,181.82 a year, which is exactly 11 years’ worth, and the plus one supplies one of them free. So 10 designated years reach zero and the 11th buys air.
The rule: start with the property that has the higher gain per year, give it only the years it needs to reach nil, then put every remaining year on the other property.
CRA’s own cottage example, and an $18,333 accident of status
Appendix A makes the point from another angle. Mr. X bought a lot in 1975 for $7,000 and built a cottage on it in 1979 for $13,000. They used it seasonally from 1979 to 2001 and sold it that fall for $65,000, a gain of $45,000. He could designate it only for 1979 to 1981 and 1996 to 2001: not 1975 to 1978, when it was a vacant lot nobody inhabited, and not 1982 to 1995, because his wife had designated the house. B is 1 plus 9, C is 27, the exemption is $16,667 and the gain is $28,333.
Example 2 changes one fact. The couple is common-law rather than married, so for 1982 to 1992 they were not yet a family unit and the cottage could also be designated for 1979 to 1992. B becomes 1 plus 20, C is still 27, the exemption is $35,000 and the gain is $10,000. Same property, same price, same use: $28,333 against $10,000, a difference of $18,333 created purely by who counted as a family unit in which years.
If you have owned since before 1982
There is relief for long-held property caught by the family unit rule. Folio 2.30 says that where a taxpayer disposes of a property owned continuously since before 1982 that cannot be designated for one or more post-1981 years because of that rule, “a transitional provision in subsection 40(6) puts a cap on the amount of the taxpayer’s gain”.
Read that as a cap, not a refund. The alternative calculation splits the gain into a pre-1982 piece and a post-1981 piece, and it helps only when the result lands below the usual method. In CRA’s Example 1 it did not bind: $28,786 against $28,333, so $28,333 is reported. The wording sits in section 40 of the Income Tax Act on Justice Laws.
How this gets filed
Where two properties are disposed of in the same year and each was at some point a principal residence, a separate Form T2091(IND) is completed for each, setting out the years it is designated for. Per Guide T4037, that case is box 3 at line 17900 of Part 1 of Schedule 3, with any gains reported on line 15800.
The short version
- Check the cottage was ordinarily inhabited each year you want, and is not mainly an income property.
- Settle each property’s adjusted cost base first.
- Divide each gain by its years of ownership. That figure, not the total gain, is what a designated year is worth.
- Designate years on the higher-value property first and stop the moment its gain hits nil.
- Put every remaining year on the other property, and ignore years before you owned the second one.
- If either property has been owned continuously since before 1982, run the subsection 40(6) calculation too.
You make this decision once, in the year of sale, on a form. It is worth an evening of arithmetic.
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