Turning a Rental Into Your Home: CRA Change-of-Use Rules

What "Change in Use" Means — and Why a Tax Bill Can Appear From Nowhere

Plenty of GTA owners plan a move like this: rent a property out for a few years, then move in themselves when they upsize or a child starts school — or the reverse, move out of their own home and rent it for income. It feels like just changing how you live in the place. In the eyes of the tax law, it’s a reportable event.

According to the CRA / canada.ca (2026), subsection 45(1) of the Income Tax Act says that when you change a property’s use — entirely from income-producing (rental or business) to personal use, or entirely from personal use to income-producing — you are deemed to have disposed of it at its fair market value at that moment and to have immediately reacquired it at the same amount. The key consequences:

• A tax can arise with no actual sale. You received no cash, yet the law calculates a capital gain through the “deemed” sale.
• Your cost base is reset. The deemed reacquisition price becomes your new cost for the eventual real sale, shaping how that future gain is computed.
• It must be reported. Even if an exemption ultimately shelters the gain, the CRA still requires you to report the disposition on that year’s return.

In short, the act of moving in — or moving out — is itself a tax checkpoint. Knowing it exists is what lets you manage it with the elections below.

Rental to Home: The Subsection 45(3) Election

This is the provision that fits the “moving into a former rental” scenario. According to the CRA / canada.ca (2026), where the use changes entirely from income-producing to principal residence, you can make a subsection 45(3) election so that the deemed disposition that would otherwise arise in the year of change does not apply, deferring the built-in gain until you actually sell the property later.

Two core benefits:

• The deemed disposition is deferred — no tax on the paper gain in the year you move in;
• The principal residence exemption reaches back up to four years — with a 45(3) election in place, the property can still be designated as your principal residence for the rental years (up to four, during which you must be a Canadian tax resident), sheltering some or all of the appreciation from those years.

But several hard conditions apply, and none can be bent:

• No CCA during the rental period. If CCA was ever claimed on the property (even in an earlier year), the 45(3) election is unavailable. This is the single most common trap.
• Filing deadline: the CRA requires the election to be filed by the filing-due date for the taxation year in which you actually dispose of the property (or within 90 days of a CRA request); in practice, file it with the year-of-change return to avoid missing it.
• One principal residence per family per year. Designating these years to this property means you cannot also designate them to another home.

Note: subsection 45(3) applies only to a complete change in use — the whole property going from rental to fully personal. A partial change (e.g., renting out one floor) follows different rules and must be assessed separately.

Home to Rental: The Subsection 45(2) Election

Going the other way — you move out of your home and rent the whole thing — is the subsection 45(2) scenario. According to the CRA / canada.ca (2026), subsection 45(2) lets you elect to be deemed not to have made the change in use, avoiding the deemed disposition in the year you move out.

The benefits mirror 45(3):

• Defers the deemed disposition, so there’s no tax on the paper gain in the year of change;
• Extends principal residence status for up to four years — even though you (and your spouse) don’t actually live there during those years, the property can still be designated as your principal residence, sheltering part of the rental-period appreciation. In certain work-relocation cases (section 54.1), the four-year cap can be extended further.

The same red lines must hold:

• No CCA during the rental period. The CRA is explicit: if CCA is claimed during the rental years, the 45(2) election is considered rescinded.
• Filing: the election is filed (as a letter) with your T1 return for the year in which the deemed disposition would otherwise have occurred.
• The trade-off: forgoing CCA means you can’t use depreciation to reduce rental income and your annual tax during the rental years. Whether it’s worth it depends on your rent, tax rate, and holding plan — exactly the math to run with an accountant.

The Principal Residence Exemption and the "+1" Rule: Why Four Years Matters

Both elections are valuable because they tuck the property under the umbrella of the Principal Residence Exemption (PRE). According to the CRA / canada.ca (2026), the exemption shelters a portion of the gain using this ratio:

Exempt capital gain = total capital gain × (number of years designated as principal residence + 1) ÷ number of years owned

Note the “+ 1”: it grants one extra year, originally meant to cover the year you sell one home and buy another so both can be sheltered. Combined with the up-to-four-year extension from a 45(2) or 45(3) election, the PRE coverage window can stretch meaningfully.

There’s also a frequently misunderstood “small rental” situation: if you use only a small part of your home for rental or business, the CRA (2026) will not treat it as a change in use — and the whole property keeps its principal residence status — as long as all three conditions hold: (1) the income-producing use is small relative to the residential use, (2) you make no structural changes for the rental, and (3) you claim no CCA. Make a structural change or claim CCA, and this safe harbour breaks.

This is why I keep hammering on CCA: it saves a little income tax during the rental years but can cost you the entire section 45 election and this slice of the exemption — usually a bad trade.

Translating the rules into action, here is practical guidance for owners planning to switch a property between rental and personal use:

1. Value the property at the time of change. The deemed disposition is measured at FMV on the change date, so get an independent appraisal then — it locks the FMV in writing so you and the CRA aren’t arguing about it years later when you really sell.
2. Check whether CCA was ever claimed. This is the first gate determining whether 45(2)/45(3) is even available. Dig out past returns and confirm.
3. Don’t miss the reporting and election deadlines. The deemed disposition must be reported on that year’s return; the elections have defined filing deadlines (above). A late filing means a remedy that isn’t always granted.
4. One principal residence per year. If you own more than one property, plan holistically which years to designate to which home to minimize overall tax.
5. Run the math on giving up CCA. Forgoing CCA is the price of the election; whether it’s worthwhile varies by situation.

The dollar stakes here are real — one deemed disposition or one missed election can be the difference of tens of thousands of dollars in tax. I can help you map the property-level timeline and pin down the market value, but how to actually file the election, how to weigh the CCA decision, and which years to designate to which home — please leave that to a licensed CPA or tax advisor working from your full picture.

I'm converting my rental into my home — do I owe tax even though I'm not selling?

Possibly. According to the CRA (2026), subsection 45(1) treats a change in use as a sale at fair market value and immediate reacquisition, so a taxable capital gain can arise even with no cash received. But if the use changes entirely from rental to home and no CCA was ever claimed, a subsection 45(3) election can defer that deemed disposition until you actually sell.

What's the difference between the 45(2) and 45(3) elections?

They run in opposite directions. Subsection 45(2) is for converting a principal residence into a rental and lets you be "deemed not to have made the change in use." Subsection 45(3) is for converting a rental into a principal residence and makes the deemed disposition not apply. Both defer the deemed disposition and extend the principal residence exemption by up to four years — and both require that no CCA be claimed during the rental period.

Why does everyone say not to claim CCA?

Because claiming capital cost allowance (CCA) makes the 45(2)/45(3) election unavailable or rescinded. According to the CRA (2026), CCA saves a little income tax during the rental years but can cost you the entire deferral and the principal residence exemption — usually a bad trade. Whether to claim it is a calculation to run with an accountant first.

When and how do I file the election?

It's filed in writing with your tax return. The 45(2) election goes with the T1 for the year the deemed disposition would otherwise have occurred; the 45(3) election is due by the filing-due date for the year you actually dispose of the property (or within 90 days of a CRA request). In practice, file early to avoid missing it, and have a tax professional handle it.

I only rent out one room of my home — does that trigger a change in use?

Usually not. According to the CRA (2026), as long as the rental use is small relative to your residential use, you make no structural changes for the rental, and you claim no CCA, the CRA does not treat it as a change in use and the whole property keeps its principal residence status. Make a structural change or claim CCA, and that safe harbour no longer applies.