Here's a sentence that's quietly cost Ontario families a fortune: "the principal residence exemption is for my house." It isn't. Not necessarily. And if you own both a house and a cottage, getting that one assumption wrong can leave tens of thousands on the table. This is the trap I watch people walk into, told from a broker's chair, because when the tax finally lands it's a financing problem and that part is mine.
The principal residence exemption can shelter the gain on your cottage just as easily as your house, but you only get to use it on one property per year. People assume it has to be the house because they live there most of the year. Often the cottage has the bigger gain and is the better property to shelter. Designating the wrong one, or assuming a sold-then-kept cottage is fully exempt, can cost a family dearly. This is your accountant's call. Mine is the cash to cover whatever's left.
One quick flag. I'm a mortgage agent, not an accountant. What follows is the plain-English version of a tax rule I see trip up cottage owners constantly. For your actual numbers, you need a tax professional. Then you need me, because there's almost always a bill at the end of it.
The Misunderstanding That Starts It All
Most people hear "principal residence" and think it means the place they sleep most nights. Nine months in the city house, three at the lake, so the house must be the principal residence. Right? Wrong.
For tax purposes, either property can be designated as your principal residence for any given year you owned it. The cottage counts. The condo counts. What you can't do is shelter both at the same time. One family, one principal residence designation per year. That's the rule that does the damage, because the choice of which property to shelter is worth real money, and most people never realize they had a choice.
Picture an $488,000 condo and a $1.4 million cottage. The instinct is to claim the condo as the principal residence because that's "home." But if the cottage has the larger gain, sheltering it instead could save a family tens of thousands. The designation is made at the time of sale, looking back over the years of ownership, and it should be a calculation, not a reflex. A good accountant will run both ways and pick the one that pays.
You don't designate your principal residence by where you get your mail. You designate it by where the bigger tax saving sits.
The "My Cottage Becomes Principal Residence" Trap
Here's the one that catches careful people. The plan sounds smart. Sell the city house, use the exemption there, move into the cottage full-time, and figure the cottage is now your principal residence so there's no tax when you're gone. Spend freely, leave the kids a clean cottage. Tidy.
Except it doesn't work that way. The cottage is only exempt for the years it was actually designated as your principal residence, not for the whole time you owned it. The exemption is prorated. So a chunk of the gain stays taxable, and the kids can get a bill they didn't see coming. Often the cottage is the only asset big enough to pay it, so it sells.
Run the math the way a tax pro would. Say you bought both the house and the cottage in 2000 and owned the cottage right through to 2040, so 40 years total. For 25 of those years you also owned the house. After selling the house you lived at the cottage for the final 15 years and designated it as principal residence for that stretch. The exempt portion isn't the whole gain. It's roughly 15 of those 40 years.
| The Cottage Numbers | The Reality |
|---|---|
| Total years owned | 40 |
| Years designated as principal residence | 15 |
| Exempt share of the gain | ~15 / 40 |
| Taxable share of the gain | ~25 / 40 |
So well over half the gain is still taxable, even though the cottage was "principal residence" for years. That surprise is exactly the kind of thing that turns a cherished cottage into a for-sale sign. It doesn't have to. It just needs to be planned around, and funded, before it lands.
Keep Every Receipt. I Mean It.
If you own a house and a cottage, here's the homework that pays off decades later: track every dollar of capital improvement on both properties. The new dock. The kitchen. The roof. The septic. Capital improvements raise your cost base, which shrinks the taxable gain, and you genuinely don't know today which property you'll want to shelter twenty years from now.
The cottage might be worth more than the house, but if you've poured far more into improvements on it, the gain could actually be smaller, which flips the whole designation decision. Your accountant can only make that call if you've kept the records. No receipts, no flexibility. So save every nickel you spend on either place.
Start a simple folder, digital or shoebox, for each property and drop in every renovation and major-repair receipt as it happens. It feels like nothing now. It can be worth tens of thousands when your accountant is deciding which property to shelter. This is the cheapest tax planning you'll ever do.
Where the Broker Comes In
Designate cleverly, keep your receipts, and you'll shrink the tax. You rarely erase it. On a cottage that's grown for thirty years, there's almost always a taxable gain left over, and that gain needs cash to settle, whether the cottage transfers during your lifetime or after you're gone.
That's the moment I get a call. The worst answer is to liquidate investments in a panic, which can trigger more tax and unravel a retirement income plan. The better answer is usually to borrow against the equity in the home, because loan proceeds aren't taxable income. For owners 55 and up, a reverse mortgage can deliver tax-free cash with no required monthly payment. A HELOC or refinance does the job when income still qualifies. This is the financing side of the same story I tell in my pillar piece on keeping the cottage in the family. The tax is the lawyer and accountant's department. Making sure the money's there is mine.
Staring down a cottage tax bill?
Let's figure out how to fund it without selling the place or gutting your portfolio. Bring your accountant's number and I'll show you the financing options. Free call, no obligation.
Book a Free Discovery CallFrequently Asked Questions
Can I use the principal residence exemption on my cottage instead of my house?
Yes. For any year you owned it, either property can be designated as your principal residence, and the cottage qualifies. You just can't shelter two properties in the same year. Because you only get one designation per year, the smart move is to shelter the property with the bigger annual gain, which is often the cottage. The designation is made when you sell, looking back over the years owned. Your accountant should calculate it both ways before choosing.
If I move into my cottage full-time, is it fully exempt from capital gains?
No, not for the whole time you owned it. The exemption only covers the years the cottage was actually designated as your principal residence, and it's prorated over your total years of ownership. If you owned the cottage for 40 years but only designated it for the final 15, roughly 25 of those 40 years of gain stay taxable. Many families are caught off guard by this, and the cottage gets sold to pay the bill. Plan for it in advance.
Why should I keep receipts for cottage renovations?
Because capital improvements raise your cost base and reduce the taxable gain. A new dock, kitchen, roof, or septic system all count. You don't know today which property you'll designate as principal residence decades from now, so you want records on both the house and the cottage. Without receipts, your accountant can't make the most tax-efficient choice. It's the easiest, cheapest tax planning there is.
How do I pay the capital gains tax on a cottage without selling it?
You fund it from somewhere other than the cottage itself. Cashing out investments can trigger more tax and damage an income plan, so borrowing against the home's equity is often cleaner because loan proceeds aren't taxable. Homeowners 55 and up can use a reverse mortgage for tax-free cash with no required monthly payment. A HELOC or refinance works when income qualifies. The right tool depends on your file, which is the conversation to have with a broker before the bill is due.