Selling a duplex or triplex in Quebec: capital gains tax, recapture, and pitfalls to avoid

Selling a duplex, triplex, or plex in Montreal or elsewhere in Quebec can trigger a significant capital gain and a recapture of CCA if you have claimed depreciation on the building. Understanding these two mechanisms helps you avoid big surprises at tax time.

This guide walks through the basics with Quebec-focused examples.

1. Sale price, ACB, and capital gain: the basics

Three main elements drive your gain:

• Sale price: the gross amount you receive (for example, $900,000).
• Adjusted cost base (ACB): original cost + acquisition costs + certain capital improvements - adjustments.
• Disposition costs: broker commission, legal fees related to the sale, etc.

The broad formula:

Capital gain = (Sale price − disposition costs) − ACB

Simple example

• Initial purchase of the triplex: $600,000.
• Acquisition costs (notary, inspection, welcome tax): $15,000.
• Capital improvements over the years (roof, windows): $40,000.
• Approximate ACB: $655,000.

You later sell for $900,000 with $40,000 in commission and fees:

• Net proceeds of disposition = $900,000 − $40,000 = $860,000.
• Capital gain = $860,000 − $655,000 = $205,000.

In Quebec, only half of the capital gain is taxable at both federal and provincial levels, but that taxable half is added to your income for the year.

2. CCA recapture (depreciation)

If you have claimed CCA (depreciation) on the building over the years, the sale can trigger recapture. This is basically the portion of CCA you must add back to income because the proceeds allocated to the building exceed its remaining tax value.

Illustration

• Initial capital cost allocated to the building portion: $500,000.
• CCA claimed over time: $60,000.
• Remaining undepreciated capital cost (UCC): $440,000.

If the portion of the sale price allocated to the building (after separating the land) is $520,000:

• You have recapture of CCA of $60,000 (up to the CCA previously claimed).
• The excess above original cost can contribute to additional capital gain.

Recapture is fully taxable as regular income, not at the 50% capital gain rate.

3. Splitting land and building

For proper capital gain and CCA calculations, you must separate the value of:

• Land (non-depreciable; affects capital gain only).
• Building (depreciable; subject to CCA and recapture).

The split can be based on:

• Municipal assessment (land vs building), or
• Independent appraisal reports.

4. Owner-occupied vs rental units

If you live in one unit of a duplex/triplex, part of the property may qualify as a principal residence, which can reduce taxable capital gains on that portion.

• You must determine the share used as your residence (for example, 1 unit out of 3) and the years you occupied it.
• The rental portion remains subject to capital gains and CCA recapture.

Good records (floor plans, square footage, occupation periods) are essential.

For more on mixing home and rental expenses, see:

• Home office vs rental expenses when you live in one unit of your duplex in Quebec.

5. Common pitfalls to avoid

• No clear record of capital improvements: hard to support your ACB and justify numbers with Revenu Quebec.
• Mixing current and capital expenses: major upgrades sometimes get expensed rather than capitalized.
• Underestimating CCA recapture: leads to a large unexpected tax bill in the year of sale.
• Ignoring the impact on your other income: a large capital gain can push your marginal rate higher.

For a deeper discussion of current vs capital work, see:

• Current vs capital expenses for a rental property in Quebec.

6. Planning the sale from a tax perspective

Some planning ideas for plex owners:

• Estimate capital gain, CCA recapture, and approximate tax before you sell.
• Consider timing of major repairs or renovations (for example, doing work the year before a sale vs after).
• Coordinate the sale with RRSP contributions and other planning. For example:
  • RRSP vs mortgage repayment vs TFSA: what to prioritize as a Quebec taxpayer?.

7. When to consult a professional

You should seek advice when:

• The sale price is far above your original purchase price.
• You have claimed CCA for many years.
• The property has mixed use (commercial + residential) or one owner-occupied unit.

A good accountant can model the outcome before closing and help you avoid surprises.

Call to action

If you are planning to sell a duplex, triplex, or plex in Quebec and want to estimate capital gains, CCA recapture, and tax impact in advance, TaxCove can help. We can review your records, validate your improvement history, and outline an exit plan. To get started, visit the secure tax intake form page or learn more about our property management services.

Important notice

This article provides general information only and does not constitute personalized tax or legal advice. Calculations and examples are simplified. Before a major transaction, consult a professional or contact Revenu Quebec and the CRA to confirm how the rules apply to your specific situation.