Two parents asked related questions about what happens when a child moves into a property that was previously a rental. Below we explain the tax consequences of a “change in use,” how the principal residence exemption works, and what triggers capital gains for each owner.

What are the tax implications of moving into a rental property?

When a property you own switches from rental use to personal use, Canadian tax rules treat this as a “change in use.” That change can create a deemed disposition at fair market value, which may trigger capital gains tax for the owners unless they take specific steps available under the Income Tax Act.

How change in use and deemed disposition work

A “change in use” from rental to personal occupancy is generally treated as a deemed disposition for tax purposes. The property is treated as if it were sold at its fair market value on the date of change in use. If the property has increased in value since purchase, a capital gain arises at that moment for any owner who experiences the change in use for their ownership share.

However, certain elections and rules can defer or modify the immediate tax consequences. The most relevant is subsection 45(3) of the Income Tax Act, which permits an eligible taxpayer to elect to defer recognition of the capital gain until the property is actually sold, provided specific conditions are satisfied.

When a 45(3) election can defer capital gains

Subsection 45(3) lets an owner elect to treat the property as still being used to produce income (for tax purposes) or to postpone the deemed disposition when the property subsequently becomes a principal residence. Key conditions include:

• The property qualifies as a principal residence after the change in use; and
• No capital cost allowance (CCA) has been claimed on the property by the owner, their spouse or common-law partner, or a related trust.

If no CCA was ever claimed and the post-change use qualifies as a principal residence, owners who meet the conditions can file the 45(3) election to defer the capital gain until the property is sold. The election is typically made by including a letter or statement with the tax return or by sending the required information to the Canada Revenue Agency (CRA) by the relevant deadline.

Who must report and when

Different owners can face different tax outcomes. One owner may claim the principal residence exemption on their share while others do not. A taxpayer generally designates a property as their principal residence when they report the sale and complete the required designation form in the year of sale. Simply changing your address with government records does not automatically make the property your principal residence for tax purposes.

For the child who moved in, the 45(3) election can often be made later — generally by the earlier of 90 days after CRA requests the election or by the tax return filing deadline in the year the property is sold. For the parents, if they did not file a 45(3) election and the property was considered to be converted to personal use in their hands (for example, because the child lived there rent-free), they may have a deemed disposition in the year of change in use and owe tax on any unrealized gain attributable to their share.

Paying rent versus living rent-free

Whether the child pays market rent affects the tax outcome. If the child becomes a paying tenant and owners continue to report rental income, the property remains income-producing and no immediate deemed disposition arises from personal occupancy. If the child lives there rent-free and the owners effectively convert it to personal use for their ownership shares, that is more likely to create a deemed disposition unless a valid 45(3) election is in place.

Practical considerations and trade-offs

Owners need to balance short-term and long-term tax consequences. Parents may be able to defer a capital gain on the condo by electing 45(3), but doing so could lead to the loss of the principal residence designation on their main home for those same years. Since each taxpayer may designate only one principal residence per year, claiming the condo as a principal residence could reduce or eliminate the exemption available for the family home, potentially creating a larger future tax bill if the home has greater appreciation.

Because ownership shares, house values and future plans differ, the optimal path varies by family. Professional tax advice is recommended to weigh the immediate tax cost against future exposure on the family home, and to ensure any elections are filed correctly and on time.

Should you claim the principal residence exemption on a property you bought for your child?

Yes, you can claim a property as your principal residence if it is owned by you, and it is ordinarily inhabited in the year by you or a spouse, common-law partner, former spouse, former common-law partner, or your child. Legal ownership or beneficial ownership both matter for the CRA’s analysis. But claiming that exemption on a property occupied by a child has tax trade-offs.

Legal versus beneficial ownership

Legal ownership means the title is recorded in your name. Beneficial ownership means someone is entitled to the use and benefits of the property even if title is recorded in another name. If the child was the beneficial owner — paying the ongoing expenses and otherwise acting as the owner — they might qualify to claim the principal residence exemption themselves even if title was in a parent’s name. Careful documentation and factual evidence are necessary to support a beneficial ownership claim.

How using the exemption on one property affects another

You can only designate one property per tax year as your principal residence. If you claim the exemption for the years the condo was occupied by your child, those years cannot also be used to shelter gains on your own house. For example, if both the house and the condo were owned concurrently, and you designate the condo for some years and your house for others, you may reduce the exempt period available for your main house, potentially increasing future tax when the house is sold.

That trade-off means that even if it is possible to claim the condo as your principal residence, it may be preferable for the child to claim it if they are the beneficial owner. Otherwise, you could shelter gains on the condo now at the expense of exposing larger gains on a more valuable family home later.

Takeaway

Converting a rental to personal use creates complex tax choices: a deemed disposition can trigger capital gains, but a subsection 45(3) election can defer recognition if conditions are met and no CCA was claimed. Only one principal residence can be claimed per year, so designating a condo occupied by a child may reduce the exemption available for your house and create larger future tax. Because results depend on ownership shares, whether rent is charged, and past CCA claims, seek professional tax guidance to determine and document the best approach and to ensure any elections or designations are filed properly.

Related topics

• Calculating capital gains on real estate
• Principal residence designation and reporting requirements
• Change in use and subsection 45(3) elections
• Legal and beneficial ownership considerations