Capital Gains Reserve When the Buyer Pays Over Several Years in Ontario

When you sell an Ontario property and hold a vendor take-back mortgage, you are lending part of the price to the buyer. You receive the money over time, but the tax system still needs a way to measure the gain from the sale.

Sellers often ask whether the gain can be spread over several years while the mortgage is paid down. The answer depends on the details of your sale, so this article focuses on how the gain is calculated, when it may not matter, and what to ask your accountant.

What a vendor take-back mortgage means for you

With a vendor take-back mortgage, you agree to be paid part of the price later, secured against the property you just sold. The buyer gets financing from you rather than a lender for that portion. The legal documents set out the amount, interest, payment schedule and your security.

The tax question is separate from the legal one. Even though you have not received all the money, the sale itself still has to be reported, and a gain may need to be accounted for. A lawyer reviews the mortgage terms; an accountant advises on timing of the gain.

How the gain is measured

A capital gain is the proceeds of disposition minus the property's adjusted cost base and any outlays and expenses of selling it. You report capital gains and losses on Schedule 3, and the taxable capital gain on line 12700. For 2025 the capital gains inclusion rate is 50%, so half of a capital gain is taxable. Check the current year's rate for a later sale.

If the property was bought or sold in foreign currency, convert the proceeds at the rate in effect at the time of the sale, the cost base at the rate on the purchase date, and expenses at the rate when they were incurred.

When a reserve may not be the main issue

If the property was solely your principal residence for every year you owned it, you usually pay no tax on the gain because of the principal residence exemption. In that case there may be little or no taxable gain to spread.

If it was not your principal residence for every year, only part of the gain is exempt. The exempt part is the gain × (designated years + 1) ÷ years owned. The CRA's example is $50,000 × (8 ÷ 10) = $40,000 exempt. If you used part of the home to earn income, you split the selling price and cost base between the two uses on a reasonable basis, such as square metres or number of rooms, and only the gain on the income-producing part is reported on line 13800 of Schedule 3. The CRA generally keeps full principal residence treatment where the income-producing use is ancillary to the home's main use as a residence, there is no structural change, and no CCA is claimed. Whether that applies to your home depends on the facts, so confirm it with an accountant.

If you sold a rental property, there may also be recapture of capital cost allowance, reported on Form T776, in addition to any capital gain. Ask your accountant how that interacts with any spreading of the gain.

Questions to ask about spreading the gain

Rules for spreading a gain, including the length of time and the amount that must be reported each year, are technical and depend on the terms of your sale. Do not assume that a longer mortgage means a longer tax deferral. Questions worth putting to an accountant:

• Does my sale qualify for any spreading of the gain at all?
• How much of the gain must I report in the year of sale?
• How is the claim made on my return, and which forms are involved?
• What happens if the buyer defaults, pays early, or I sell the mortgage?
• Does any part of the price relate to a rental use, or to recapture?
• Does my plan change if I was not resident in Canada for part of the time I owned the property?

On that last point, years in which you were not resident in Canada do not count as designated years in the exemption formula, though they still count as years owned.

What to do next

• Gather the purchase documents, so your cost base and closing costs are clear.
• Collect the sale agreement and the draft vendor take-back mortgage terms.
• Work out how you used the home each year you owned it.
• Ask your accountant about the reserve before you file, not after.
• Have your lawyer review the mortgage security and payment terms before closing.

Frequently asked questions