Key Takeaways
- 1.The PRE formula gives you a 75% exemption on the $430,000 gain: (1 + 2 designated years) ÷ 4 years owned = 75%. The exempt portion is $322,500.
- 2.The remaining $107,500 is a taxable capital gain. At the 2025 inclusion rate of 50% (under the $250K threshold), this adds $53,750 to your taxable income.
- 3.At Ontario combined marginal rates, the approximate tax on this gain ranges from $14,800 to $22,000+ depending on your other income — not a trivial amount on what many assume is a tax-free home sale.
- 4.Filing a s.45(2) election when you started renting could have extended the PRE for up to 4 additional years — potentially covering the entire rental period and eliminating the taxable gain entirely.
- 5.You must file Form T2091 and report the sale on Schedule 3 when claiming a partial PRE. Failure to report can result in CRA denying the exemption.
The PRE Formula: How Partial Exemptions Work
The principal residence exemption is Canada's most valuable personal tax shelter, but it only covers years in which you “ordinarily inhabited” the property. When you rent out a property for part of your ownership period, the exemption becomes partial. The formula, defined in paragraph 40(2)(b) of the Income Tax Act, is:
Exempt Gain = Total Gain × (1 + Years Designated as Principal Residence) ÷ Years Owned
The “+1” in the numerator is a bonus year built into the formula. It exists to prevent double taxation when you sell one home and buy another in the same calendar year — without it, you would lose one year of designation during the transition. For partial claims, this bonus year significantly increases the exempt fraction.
| Variable | Description | This Example |
|---|---|---|
| Total Gain | Sale price minus adjusted cost base (purchase price + eligible expenses) | $430,000 |
| Years Owned | Number of tax years in which you owned the property | 4 |
| Years Designated | Years you designate as your principal residence (must have ordinarily inhabited) | 2 |
| Bonus Year | The “+1” in the numerator | 1 |
| Exempt Fraction | (1 + 2) ÷ 4 | 75% |
The exempt fraction cannot exceed 100%. If your designated years plus the bonus year equal or exceed the years owned, the entire gain is exempt. This is why the PRE eliminates the gain completely for most homeowners who live in their property for the entire ownership period.
Worked Example: $850K Sale, $420K Purchase, 2 Years Rented
An Ontario resident bought a Toronto condo in 2021 for $420,000, lived in it through 2022, then rented it out for 2023 and 2024. They moved back in briefly and sold in 2025 for $850,000. No s.45(2) election was filed when the property became a rental.
Step 1: Calculate the total capital gain
Sale price: $850,000
Adjusted cost base: $420,000
Total gain: $850,000 − $420,000 = $430,000
Step 2: Determine years owned and designated
Years owned: 4 (2021, 2022, 2023, 2024)
Years designated as principal residence: 2 (2021, 2022)
Years rented: 2 (2023, 2024)
Step 3: Apply the PRE formula
Exempt fraction: (1 + 2) ÷ 4 = 3/4 = 75%
Exempt gain: $430,000 × 75% = $322,500
Taxable capital gain: $430,000 − $322,500 = $107,500
Step 4: Apply the 2025 inclusion rate
$107,500 is below the $250,000 individual threshold
Inclusion rate: 50%
Amount added to taxable income: $107,500 × 50% = $53,750
Step 5: Estimate Ontario tax on the gain
At $100K base income, marginal rates on an additional $53,750:
Federal: ~29% on income $111,733–$154,906
Ontario: ~11.16% on income $92,454–$150,000
Combined marginal rate: ~40.16%
Approximate tax on the gain: $53,750 × 40.16% = ~$21,586
That $21,586 tax bill is the cost of not filing a s.45(2) election when the property became a rental — an election that costs nothing to file and could have eliminated the taxable portion entirely. We will cover that election in detail below.
How the 2025 Capital Gains Inclusion Rate Applies
For dispositions in 2025, the capital gains inclusion rate for individuals is tiered. The first $250,000 of net capital gains in the tax year is included at 50%. Any capital gains above $250,000 are included at 66.67% (two-thirds). For a deeper breakdown of how this tiered rate works, see our 2025 capital gains inclusion rate calculator.
In our worked example, the taxable capital gain is $107,500 — well within the $250,000 threshold. The entire amount is included at 50%, producing $53,750 of taxable income. But consider a higher-value scenario:
| Scenario | $850K Sale (This Example) | $1.35M Sale (GTA Upgrade) | $2M Sale (Detached Home) |
|---|---|---|---|
| Purchase price | $420,000 | $750,000 | $1,100,000 |
| Total gain | $430,000 | $600,000 | $900,000 |
| Exempt portion (75% PRE) | $322,500 | $450,000 | $675,000 |
| Taxable capital gain | $107,500 | $150,000 | $225,000 |
| Included at 50% (up to $250K) | $53,750 | $75,000 | $112,500 |
| Included at 66.67% (above $250K) | $0 | $0 | $0 |
| Added to taxable income | $53,750 | $75,000 | $112,500 |
| Approx. Ontario tax (~40%) | ~$21,586 | ~$30,750 | ~$47,250 |
All three scenarios assume 4 years owned, 2 years rented (75% exempt fraction), and a base income of $100,000. The $250,000 threshold applies to the capital gain, not the taxable income addition. None of these scenarios breach the threshold because the 75% PRE reduces the gain below $250K in each case. For higher gains or shorter ownership periods, the 66.67% rate applies to the excess.
The s.45(2) Election: How It Could Have Saved $21,586
Section 45(2) of the Income Tax Act lets you elect to defer the deemed disposition that normally occurs when you change the use of a property from personal to income-producing (i.e., when you start renting it out). Without this election, converting your principal residence to a rental triggers a deemed disposition at fair market value on the date of conversion — and starts a new cost base for the rental period.
With the s.45(2) election, two things happen:
- No deemed disposition: The change in use does not trigger a capital gain at the time of conversion.
- Extended PRE designation: You can continue to designate the property as your principal residence for up to 4 years after you stop living in it, provided you do not designate another property for those years.
In our example, the condo was rented for only 2 years (2023 and 2024). With a s.45(2) election filed at the time of conversion, the owner could have designated the condo as their principal residence for all 4 years of ownership. The PRE formula becomes:
With s.45(2) election:
Years designated: 4 (all years, including the 2 rental years)
Exempt fraction: (1 + 4) ÷ 4 = 5/4 = capped at 100%
Exempt gain: $430,000 × 100% = $430,000
Taxable capital gain: $0
Tax owed: $0
Without s.45(2) election:
Years designated: 2
Exempt fraction: (1 + 2) ÷ 4 = 75%
Taxable capital gain: $107,500
Tax owed at ~40%: ~$21,586
The election is filed by attaching a letter to your T1 return for the year in which the change of use occurs. There is no prescribed form — a letter stating your intention to elect under subsection 45(2) is sufficient. CRA does accept late-filed elections in many cases, though a penalty may apply. If you have already converted a property to rental use without filing, consult a tax professional about the feasibility of a late election.
Key Limitation: You Cannot Designate Two Properties
The s.45(2) election has an important catch: you cannot designate another property as your principal residence for the years you are using the extended designation on the rental property. If our condo owner purchased a new home in 2023 to live in while renting out the condo, they would face a choice:
| Strategy | Designate Condo | Designate New Home |
|---|---|---|
| 2021–2022 | Condo (lived in it) | N/A (not yet owned) |
| 2023–2024 | Condo (s.45(2) extension) | New home (lived in it) |
| Conflict | Cannot designate both for 2023–2024. Must choose which property gets the PRE for those years. | |
The optimal choice depends on which property has the larger per-year gain. If the condo appreciated faster than the new home, designate the condo for 2023–2024 and accept a partial exemption on the new home when it is eventually sold. For families with cottages and homes, see our blended family PRE calculator for two homes.
CRA Reporting: Schedule 3 and Form T2091
Since 2016, CRA requires you to report every disposition of a principal residence, even if the gain is fully exempt. The reporting requirements depend on whether you are claiming a full or partial exemption:
| Requirement | Full PRE Claim | Partial PRE Claim |
|---|---|---|
| Schedule 3 (Capital Gains) | Required | Required |
| Form T2091(IND) | Simplified reporting allowed | Full form required |
| Report gain on Schedule 3 | $0 (fully exempt) | $107,500 taxable gain |
| Late-filing penalty | $100/month (max $8,000) | $100/month (max $8,000) |
| Risk of non-filing | CRA may deny exemption | CRA may deny exemption |
The $100/month penalty for late-filing T2091 is separate from any late-filing penalty on your T1 return. CRA introduced mandatory principal residence reporting in 2016 to close a compliance gap — prior to that, many sales went unreported because no form was required. For late-filing penalties on your overall return, see our CRA late-filing penalty calculator.
The Property Flipping Rule and Its Interaction with the PRE
Since January 1, 2023, the property flipping rule (section 12(13) of the Income Tax Act) treats profits from selling a residential property owned for fewer than 365 days as business income, not capital gains. This means:
- 100% of the profit is taxable (no 50% inclusion rate)
- The principal residence exemption is not available
- The profit is subject to income tax at your full marginal rate
In our worked example, the condo was owned for 4 years, so the flipping rule does not apply. But the rule is particularly relevant for Ontario investors who buy pre-construction condos. If a condo is purchased pre-construction and sold within 365 days of closing, the profit is business income regardless of whether the buyer lived in it. Exceptions exist for dispositions triggered by death, disability, separation, insolvency, job relocation (at least 40 km closer to work), or threats to personal safety.
Ontario-Specific: Marginal Tax on the Taxable Gain
The $53,750 added to taxable income is taxed at your combined federal and Ontario marginal rates. Because marginal rates are progressive, the tax depends heavily on your other income. Here is the approximate tax on the $53,750 taxable capital gain addition at three different base income levels:
| Base Income | Federal Marginal | Ontario Marginal | Combined | Tax on $53,750 |
|---|---|---|---|---|
| $60,000 | 20.5% | 9.15% | 29.65% | ~$14,812 |
| $100,000 | 26%–29% | 11.16% | ~40.16% | ~$21,586 |
| $150,000 | 29%–33% | 12.16%–13.16% | ~43.41% | ~$23,333 |
Marginal rates are blended where the gain straddles bracket boundaries. Ontario surtax is included. The tax on the gain varies by more than $8,500 depending on your base income — a reminder that capital gains tax calculations require knowing your complete income picture. For baseline Ontario take-home numbers, see our Ontario income tax take-home calculator.
What Qualifies as a Principal Residence?
To designate a property as your principal residence for a given tax year, you must meet all of the following conditions in that year:
- Ordinarily inhabited: You, your spouse or common-law partner, your former spouse, or your child must have lived in the property at some point during the year. There is no minimum duration — CRA accepts seasonal occupation (e.g., a cottage used every summer) as sufficient.
- Ownership: You must own the property (solely or jointly). A beneficial ownership interest is sufficient; legal title is not strictly required.
- Canadian property: The property must be located in Canada. Foreign properties do not qualify for the PRE.
- Housing unit: The property must be a housing unit, a leasehold interest in a housing unit, or a share in a co-operative housing corporation. Land up to half a hectare (1.24 acres) is included; additional land qualifies only if it is necessary for the use and enjoyment of the housing unit.
A property that was purely an investment — never lived in by anyone in the family unit — does not qualify for the PRE in any year. The gain on its sale is fully taxable as a capital gain. For rental property depreciation strategies, see our rental property CCA calculator.
Change-in-Use Scenarios: When the PRE Gets Complicated
The partial PRE is most commonly triggered by a change in use — converting a personal residence to a rental or vice versa. Here are the three main scenarios and their tax consequences:
| Scenario | Tax Consequence | Election Available |
|---|---|---|
| Principal residence → rental | Deemed disposition at FMV; new cost base starts | s.45(2) — defer deemed disposition, extend PRE up to 4 years |
| Rental → principal residence | Deemed disposition at FMV; recapture of CCA if claimed | s.45(3) — defer deemed disposition, designate retroactively up to 4 years |
| Partial rental (e.g., basement suite) | Generally no deemed disposition if no structural change and no CCA claimed | No election needed — full PRE typically maintained |
Note the CCA interaction: if you claimed Capital Cost Allowance (depreciation) on the property while it was a rental, you cannot use the s.45(2) election to extend the PRE for those years. Claiming CCA on a property you intend to claim the PRE on is almost never advisable. The CCA recapture on conversion back to personal use is taxed as income, not capital gains.
Cottage vs Condo: Choosing Which Property to Designate
Many Ontario families face the condo-vs-cottage designation problem. You can only designate one property per year, so the optimal strategy is to allocate designation years to the property with the higher per-year gain. Here is a simplified comparison:
Ontario Condo:
Gain: $430,000 over 4 years = $107,500 per year
Muskoka Cottage (hypothetical):
Gain: $300,000 over 15 years = $20,000 per year
Optimal strategy: Designate the condo for all eligible years (higher per-year gain). Use remaining designation years on the cottage when it is eventually sold.
This per-year-gain comparison is the single most important calculation when planning PRE designations across multiple properties. For Ontario cottage owners specifically, our cottage capital gains calculator walks through a full worked example with family cottage numbers.
Important Disclaimer
This article provides general information about the Canadian principal residence exemption and partial PRE calculations for the 2025 tax year. It is not financial, tax, or legal advice. The PRE formula is defined in paragraph 40(2)(b) of the Income Tax Act. The s.45(2) and s.45(3) change-in-use elections are subject to specific conditions and filing requirements. The 2025 capital gains inclusion rate (50% on the first $250,000 for individuals, 66.67% above) applies to dispositions on or after June 25, 2024. Ontario marginal tax rates are estimates based on 2025 brackets and do not account for all credits, deductions, surtaxes, or individual circumstances. Property flipping rules under section 12(13) apply to properties owned fewer than 365 days. CRA reporting requirements for principal residence sales have been mandatory since the 2016 tax year. Consult a licensed tax professional before making decisions based on this information.