Change in Use in Canada: When a Rental Unit Becomes Your Home (A Real Tax Court Case)

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Many Canadian homeowners rent out part of their home. For example, you may rent the top unit of a duplex. Or you may rent a basement suite. Later, life changes. So you stop renting. Then the rental unit becomes part of your home.

This switch is called a change in use. It sounds simple. However, it can create a tax surprise.

In this post, I share a real Tax Court of Canada case. The case explains one key issue. It asks whether a taxpayer can defer tax when only part of a property changes from rental use to personal use.

I’m Amandeep Singh, CPA, founder of Cloudiverse CPAs Inc in Burnaby. I help business owners and landlords understand tax rules in plain language. Think of our team like a clear map for income tax decisions. You see the route. You avoid wrong turns.

The Real Case: Jean-Luc Gauthier (2024 TCC 22)

Here is the public decision link:
https://decision.tcc-cci.gc.ca/tcc-cci/decisions/en/item/521226/index.do?q=JEAN-LUC+GAUTHIER

The facts were not in dispute. The numbers were also not in dispute. That made the case easier to follow.

Here is what happened:

  • In 2008, Mr. Gauthier bought a duplex in Montreal.

  • He lived in the lower unit as his main home.

  • He rented the upper unit to tenants.

  • In 2017, he stopped renting the upper unit.

  • Next, he renovated the duplex into a single-family home.

  • After the work, he used the whole home as his principal residence.

As a result, the upper unit changed from rental use to personal use. This created a deemed disposition for that portion under the tax rules. In simple terms, the law can treat part of the property like it was sold at fair market value. That can create a capital gain.

Mr. Gauthier reported the capital gain in his 2017 tax return. The CRA assessed the return as filed.

Later, he learned that a deferral option existed. So he filed a notice of objection to claim that deferral. However, the CRA said the deferral only applied when the entire property changed from rental to personal use.

That disagreement went to court.

The Main Question the Judge Had to Answer

The core question was practical:

If only part of a property stops being a rental, can the owner still use the deferral option that prevents immediate tax?

This mattered a lot. After all, many people rent only part of their home. So a strict rule would affect many duplex and suite owners.

What Evidence and Circumstances Mattered Most

The judge focused on the real-life use of the property.

First, the taxpayer stopped renting the upper unit. So rental income from that unit ended.

Next, the property became one family home after renovations. So the use was clearly personal after the change.

Also, the judge reviewed how section 45 works as a whole. That context mattered. The law already deals with partial personal and partial rental use in other parts of the same section. Therefore, partial use was not a new concept inside the rules.

Why the Tax Court Allowed the Deferral

The judge used a common approach to reading tax law. He looked at the wording, the context, and the purpose together.

He accepted that the wording could look narrow at first. Still, he found that a narrow reading did not fit the overall design of the rules.

He pointed to several practical points:

  • The section already addresses partial changes in use elsewhere.

  • The deferral rule aims to avoid tax when a home becomes a principal residence.

  • The purpose does not depend on the property being 100% rental before the change.

  • After the switch, the taxpayer earned no rental income from that unit.

As a result, the court allowed the appeal. The court sent the matter back for reassessment on the basis that the taxpayer could claim the deferral for the partial change in use.

Why This Case Matters for Homeowners and Landlords

This case matters because change in use often happens during normal life events.

For example:

  • A child needs more space.

  • Parents move in.

  • You stop renting for peace of mind.

  • You renovate and use the whole home.

In these moments, tax paperwork is rarely top of mind. Still, timing and reporting matter a lot.

A small missed step can create stress. It can also create a cash-flow problem. So planning early helps.

Practical Best Practices You Can Use

Here are simple steps that help many property owners:

  • Track the date the rental use ends

  • Keep records of renovations and how the space was used

  • Estimate fair market value around the change date

  • Review reporting options before you file the tax return

  • Get advice early when a suite or unit becomes personal space

Also, keep it simple. One good conversation before the change can prevent months of cleanup later.

How Cloudiverse CPAs Inc in Burnaby Can Help

At Cloudiverse CPAs Inc, we help clients plan change-in-use events with clarity.

We can help you:

  • Understand your options before you change the use

  • Organize the records CRA expects to see

  • Review your filing approach for the year of the change

  • Reduce surprises and protect cash flow

You stay focused on your home and your business. Meanwhile, we guide the tax path with clear steps.

Read more on Change in Use 

Watch the video on this topic here 

Disclaimer

This blog is for general information only. It is not tax, legal, or financial advice. Your results depend on your facts. Please speak with a qualified advisor about your situation.