Principal Residence Exemption in Ontario: Niagara Guide

Written by Emily Barry

Updated November 2, 2026. Quick answer: If the home you’re selling was your principal residence for every year you owned it, the principal residence exemption usually means you pay no tax on the gain. You still have to report the sale on Schedule 3 and Form T2091 on your tax return, or you can lose the exemption. Ontario has no separate capital gains tax, but you pay tax on any part of a gain the exemption doesn’t cover at your combined federal and Ontario rate, with half the gain taxable. In Niagara, the sales that trip people up are Lake Erie cottages, homes with a rented suite or Airbnb, rural lots over 1.24 acres, inherited homes and homes owned by Americans.

Aerial view of a lakeside Niagara neighbourhood. The principal residence exemption usually covers the gain when you sell your home.

What is the principal residence exemption?

The principal residence exemption (PRE) is a federal tax rule that can wipe out the capital gain when you sell a home you lived in. A property can qualify for a year if (CRA):

It’s a housing unit (house, condo, cottage, mobile home or co-op share) that you own, alone or jointly.
You, your spouse or partner, a former spouse, or your child lived in it at some point that year. Summers at a cottage can count.
You designate it as your principal residence.

One home per family per year. A couple and their minor, unmarried children can only designate one property for any given year (Income Tax Folio S1-F3-C2). If you own a house and a cottage, you have to choose.

You must report the sale. Since 2016, the CRA only allows the exemption if you report the sale and designate the home on Schedule 3 of your return, plus Form T2091(IND). The CRA can accept a late designation, but a penalty may apply: the lesser of $100 for each full month late or $8,000 (CRA).

Couples, co-owners and partial exemptions

The principal residence exemption belongs to each owner, so two people on the same title don’t always get the same result.

You each owned a home before you got together. For each year you’re married or common-law for the whole year (common-law means 12 months living together, or sooner with a child), you can only designate one home between you (CRA). If you kept both homes, the exemption may only cover part of the gain on the one you sell later.
A parent is on title with an adult child. A parent can designate their share only if they, their spouse or their child lived there that year, and that uses up the year for the parent’s own home (Folio S1-F3-C2). If the parent keeps the exemption for their own house, their share of the child’s home can be taxable.
You’re separated. If you lived apart all year under a court order or written separation agreement, each of you can designate a home for that year.

If any of these sound like you, talk to your accountant before you list so the designation is planned, not guessed.

How the principal residence exemption formula works

The exempt part of a gain is:

Gain × (1 + years designated as your principal residence) ÷ years you owned it

The “plus one” covers the year you own two homes because you’re moving (Folio S1-F3-C2, ¶2.28).

Example: moving across Niagara. You bought a St. Catharines home in 2019. In August 2026 you buy in Thorold, move, and sell the St. Catharines home in September. You owned the St. Catharines home in 8 tax years (2019 to 2026). Designate it for 2019 to 2025 (7 years): (1 + 7) ÷ 8 = 100% exempt. That leaves 2026 free to designate the Thorold home later.

How capital gains are taxed in Ontario

There’s no separate Ontario capital gains tax. The CRA works out any gain the exemption doesn’t cover under federal rules:

Gain = sale price − adjusted cost base (purchase price, closing costs and capital improvements) − selling costs (commission, legal fees).
Half is taxable. The inclusion rate is still 50%. The federal government cancelled the proposed increase to two-thirds in March 2025 (Prime Minister of Canada; CRA).
You add the taxable half to your income and pay tax on it at your combined federal and Ontario rate. In 2026 that works out to as much as 26.76% of the full gain. The top rate applies over $258,482 of taxable income (EY 2026 Ontario rates; CRA).

A large taxable gain can also trigger the alternative minimum tax, so ask your accountant to check.

Thinking about selling a home in Niagara? Book a seller’s meeting and we’ll walk you through pricing, timing and what to ask your accountant before you list.

Ontario and Niagara: what’s different

Topic	Ontario / Niagara reality (as of November 2, 2026)
Provincial capital gains tax	None. The taxable half is taxed at Ontario income tax rates on top of federal rates
Provincial flipping tax	None. B.C. has a separate home flipping tax on sales within 730 days (B.C.). Ontario sellers only face the federal 12-month rule
Non-Resident Speculation Tax (25%)	Charged when a foreign buyer buys, not when anyone sells (Ontario.ca)
Land transfer tax	Paid by the buyer. No link to the PRE. First-time buyers can get up to $4,000 back if they move in within nine months (Ontario.ca)
Estate administration tax (probate)	$15 per $1,000 of estate value over $50,000, separate from income tax (Ontario.ca)
Underused Housing Tax	Eliminated for 2025 and later. Returns for 2022 to 2024 are still owed by affected owners (CRA)
Extra units	Ontario allows up to three units on most urban residential lots (O. Reg. 462/24). Renting one can partly affect the PRE

Buying next? See Ontario closing costs and land transfer tax.

Lake Erie cottages and the principal residence exemption

A cottage you use every summer can qualify for the principal residence exemption. When you sell it, you choose which years to put on it, and your house can’t use those years later.

Example: a Niagara Falls house and a Crystal Beach cottage

This is a hypothetical example with round numbers to show how the choice works. A couple bought their Niagara Falls house in 2012 for $300,000. It’s now worth about $560,000, close to Niagara Falls’ September 2026 NAR benchmark of $560,500. After about $27,000 in selling costs, the gain would be about $233,000 over 15 years, or roughly $15,500 a year. They bought a Crystal Beach cottage in 2015 for $240,000, put $30,000 into a new septic system and an addition, and sell it in 2026 for $545,000 with $25,000 in selling costs.

Cottage gain: $545,000 − $270,000 − $25,000 = $250,000 over 12 years, or about $20,800 a year.

Choice	Cottage gain taxed	House gain exposed later*	Total taxable gain
A: Don’t designate the cottage	$250,000	$0	$250,000
B: Designate the cottage for 2015 to 2025 (11 years + 1 = 12/12)	$0	$233,000 × 10/15 = $155,333	$155,333

*If they sold the house at today’s value, they could then only designate it for 2012 to 2014 and 2026: (1 + 4) ÷ 15 exempt.

Which choice saves more tax?

The cottage gained more per year, so Option B shelters about $95,000 more gain. Option A’s taxable half is $125,000, about $66,900 in tax at the top Ontario rate. Option B pushes the tax to the house sale, and the exposed share grows with the house’s value. Run your own numbers with an accountant.

Short-term rentals in Niagara Falls, Niagara-on-the-Lake and Fort Erie

A home you mainly own to rent on Airbnb usually doesn’t qualify, even if you stay a few weeks a year (Folio S1-F3-C2, ¶2.11). Each town licenses short-term rentals:

Niagara Falls: Whole-home vacation rentals are only allowed in Tourist Commercial, General Commercial and Central Business zones, not residential ones (City of Niagara Falls). The owner-occupied pilot (a separate unit at your principal residence) closed to applications on September 30, 2026, and Council is reviewing it (City of Niagara Falls).
Niagara-on-the-Lake: Every short-term rental needs a Town licence (Town of NOTL).
Fort Erie: The town limits dedicated rentals to certain zones, including R2B. Owner-occupied rentals require you to live full-time in a separate unit on the property (Town of Fort Erie).

Renting a separate, self-contained unit at your home, which is what owner-occupied licences require, is a partial change in use. See the next section.

Basement apartments, garden suites and student rentals

The CRA usually treats the whole home as your principal residence if the rental is secondary to your own use, there are no structural changes, and you don’t claim depreciation (CCA) (Folio, ¶2.59–2.60). Renting rooms to Brock or Niagara College students in your own St. Catharines, Thorold or Welland home usually fits.

A legal basement apartment or garden suite is a structural change. The CRA treats the rented portion as sold at market value, so part of a future gain can be taxable, unless you file a section 45(2) election for the partial change in use and don’t claim CCA on it.

Bought a house for a student child? It can qualify because your child lives there, but your family still gets one designation per year.

Rural acreage in West Lincoln, Wainfleet, Pelham and Lincoln

The exemption covers the house plus half a hectare (about 1.24 acres). Gain on extra land is taxable unless you can show the land was needed to use the home. One accepted reason is a zoning rule that prevented severing it (Folio, ¶2.33–2.35). Much of rural Niagara has minimum lot sizes or limits on creating new lots. Have a local lawyer or planner confirm it for a specific property.

Working farms have separate rules. You can split the home from the farm when you calculate the gain, or use a special election for the whole property, and qualified farm property may be eligible for the lifetime capital gains exemption (Folio, ¶2.39–2.47).

American owners and US citizens in Niagara

Americans with a Fort Erie or Crystal Beach cottage (non-residents of Canada): Canada taxes the gain on Canadian real estate. Years you weren’t a Canadian resident generally don’t count toward the PRE. Under section 116, you notify the CRA (Form T2062) no later than 10 days after closing and prepay 25% of the gain. Until the CRA issues a clearance certificate, the buyer’s lawyer holds back up to 25% of the price (CRA). Build that into your closing timeline.
US citizens living in Niagara: The Canadian PRE doesn’t stop US tax. The IRS lets you exclude $250,000 of gain ($500,000 if married filing jointly) if you owned and lived in the home for two of the last five years (IRS Publication 523). Gain above that can be taxed in the US with no Canadian tax to credit, measured in US dollars.

Renting out your home (or moving back) and the principal residence exemption

When a home becomes a rental, you’re treated as having sold it at market value that day. A section 45(2) election, filed with that year’s return, lets you skip that and keep designating the home for up to four more years while it’s rented, as long as you don’t claim CCA and don’t designate another home for those years. The limit can be longer if your employer relocated you at least 40 km away (Folio, ¶2.48–2.52). A section 45(3) election works the other way, when a rental becomes your home.

Example: Welland home rented out while you work away. You bought it in 2016 for $380,000, lived there through 2020, then rented an apartment in Toronto for work and rented the Welland house out. You sell in 2026 for $560,000 with $25,000 in costs. The gain is $155,000 over 11 tax years.

With a 45(2) election: designate 2016–2020 (5 years) plus 2021–2024 (4 years) = 9 years. (1 + 9) ÷ 11 × $155,000 = $140,909 exempt. Taxable gain: $14,091, and you include half, $7,045, in income.
Without the election: you’re treated as having sold it in 2020 at, say, $430,000. That gain is exempt, but the gain from 2020 to 2026 isn’t: $560,000 − $25,000 − $430,000 = $105,000 taxable gain, and you include half, $52,500, in income.

Selling within a year: the flipping rule

For sales since January 1, 2023, profit on a home you owned for less than 365 days is generally business income. It’s fully taxable, and the PRE doesn’t apply (CRA). Life-event exceptions include death, a new household member, separation, a safety threat, serious illness, an eligible relocation and involuntary job loss (Folio, ¶2.6.4). The rule also covers selling your contract on a new build (an assignment). More in The Fine Print of Flipping a House.

Inherited homes, adult children and the principal residence exemption

At death, the CRA treats the owner as selling at market value, and the executor can claim the PRE on the final return (CRA). Growth after death is the estate’s gain.
Gifting or selling below value to an adult child counts as a sale at market value for you, while your child’s cost is only what they paid, which can mean double tax. Adding a child to title can trigger a partial sale too.

Before you list: a principal residence exemption checklist

Gather purchase records and receipts for capital improvements. They raise your cost base.
List every property you’ve owned, the years you lived in each, and any rental use or CCA claimed.
Non-residents and US citizens: talk to a cross-border accountant before you sign.
Get a current value. Start with a free home evaluation, and see what to fix before selling in Niagara.

Selling in Niagara Falls, St. Catharines, Fort Erie, Port Colborne, Wainfleet, Niagara-on-the-Lake or West Lincoln? Our community pages cover each town’s market, and should I sell my house in Niagara right now covers timing.

Budget 2026 note: The federal budget comes out November 5, 2026 (Finance Canada). We’ll update this guide if it changes anything here. Non-resident buyers should also read our foreign buyer ban update.

Principal residence exemption: frequently asked questions

Selling and tax

Do I pay capital gains tax when I sell my house in Ontario?

Usually not, if it was your principal residence for every year you owned it. You still have to report the sale on Schedule 3 and Form T2091(IND).

Is there a separate Ontario capital gains tax?

No. Half of any gain that isn’t exempt goes on your income at your combined federal and Ontario rate, up to about 26.76% of the full gain in 2026.

What if I sell my home within a year of buying it?

Since 2023, profit on a home owned under 365 days is generally fully taxable business income, with no exemption. Exceptions include death, separation, serious illness, relocation and job loss.

Is the capital gains inclusion rate going up in 2026?

No. Ottawa cancelled the increase to two-thirds in March 2025, so half of a gain is taxable. We’ll update this guide if the November 5, 2026 federal budget changes anything.

Cottages, couples and American owners

Can my Crystal Beach or Port Colborne cottage be my principal residence?

Yes, if your family lives there during the year, even just in summer. But a family can only designate one property per year, so any year you use for the cottage can’t be used for your house.

My spouse and I each owned a home before we married. Can we both use the principal residence exemption?

Before you married or became common-law, each of you can designate your own home. For each full year as a couple, you can only designate one home between you, so the home you sell later may only get a partial exemption. Ask your accountant which years to use before you list.

Can an American who owns a Fort Erie cottage use the principal residence exemption?

Generally not, for years they weren’t a Canadian resident. Non-resident sellers also go through section 116: notify the CRA and prepay 25% of the gain, or the buyer’s lawyer holds back up to 25% of the price.

Talk to us before you list

The Barry Team is led by Emily Barry, a REALTOR® in Niagara since 2003. Emily is #1 in Niagara Falls on Rate-My-Agent with a 4.99 rating, and the team ranked #5 among all eXp teams in Canada by sales volume in July 2026. We don’t give tax advice, but we can help you time a sale and get a market value your accountant can use. Book a seller’s meeting or get a home evaluation.

Disclaimer: This is general information as of November 2, 2026, not tax or legal advice. Tax rules change and every situation is different. Talk to an accountant or tax lawyer before you sell, designate a property or file an election. The Barry Team and eXp Realty aren’t tax advisors.