Reporting a Property Sale to the CRA: An Ontario Seller's Guide

Selling a home in Ontario feels like the finish line — keys exchanged, funds wired, moving boxes stacked by the door. But for many sellers, one obligation lingers long after closing day: reporting the sale to the Canada Revenue Agency. Since a rule change in 2016, reporting a property sale to the CRA is mandatory for virtually every Ontario seller, even when not a single dollar of tax is owed. Miss this step and the consequences can be surprisingly expensive.

This guide walks through what you need to gather, what you actually have to do, and where things most often go sideways. It is written for Ontario homeowners, not tax professionals — though you will almost certainly want one before you file.

What changed in 2016 — and why it still catches people off guard

Before 2016, a seller who qualified for the full principal residence exemption (PRE) did not have to report anything. The thinking was simple: no tax, no form. The CRA closed that gap in the 2016 tax year. Now, every disposition of a property that was, or could have been, a principal residence must be reported on your income tax return for the year of the sale — even if you owe nothing.

The reason matters: the exemption is not automatic. You have to claim it. The CRA needs to know you sold the property so it can confirm you are entitled to the shelter it provides. Failing to report does not make the gain disappear; it makes the exemption unavailable until you fix the omission, and by then penalties may have accumulated.

What you need to gather before you file

Your accountant or tax preparer cannot work without source documents. Assemble these before your first meeting:

• Original purchase price (adjusted cost base, or ACB): the price you paid plus eligible closing costs — legal fees, land transfer tax, home inspection
• Capital improvements: receipts for renovations that added value (a new kitchen, an addition, a finished basement) — not maintenance, but true improvements
• Selling costs: real estate commissions, legal fees on the sale side, any costs directly tied to the transaction
• Proceeds of disposition: the sale price stated in your Agreement of Purchase and Sale
• Date of acquisition and date of disposition: month and year are enough for the PRE calculation, but exact dates matter for other purposes
• Number of years the property qualified as your principal residence: if you rented part or all of it at any point, those years may not count
• Closing documents from your real estate lawyer: the statement of adjustments is the authoritative source for the final numbers — keep a copy

Your Ontario real estate lawyer provides the closing paperwork; your accountant uses it to prepare the return. These are two separate roles, and neither automatically does the other's job.

What you actually have to do

Completing Schedule 3

All capital gains — or losses — from the sale of property go on Schedule 3 (Capital Gains or Losses), which is filed with your T1 personal income tax return for the year the sale closed. If your property sold and closed in 2025, you report it on your 2025 return, due April 30, 2026 (or June 15, 2026 if you or your spouse are self-employed, though any balance owing is still due April 30).

If the property was not your principal residence for every year you owned it — rental property, a cottage you never designated, or a home that had a period of rental use — a portion of the gain may be taxable. A taxable capital gain means a portion of that gain (the inclusion rate, which can change and should be confirmed with the CRA or an accountant as of your filing date) gets added to your income for the year.

Claiming the principal residence exemption with T2091

If you are claiming the PRE — in whole or in part — you also file Form T2091 (IND): Designation of a Property as a Principal Residence by an Individual. This form is where you formally designate the years the property served as your principal residence. The number of designated years feeds directly into how much of the gain, if any, is sheltered.

A property can only be your principal residence for years in which you ordinarily inhabited it (or your spouse, common-law partner, or children did). You can only designate one property per family unit per calendar year.

The filing deadline is the key date

Both Schedule 3 and T2091 are filed as part of your T1 return. The return is due on the normal personal tax deadline for the year of sale. There is no separate deadline for the property-sale reporting pieces — they travel with the return.

What can go wrong

Not reporting at all

This remains the most common error, particularly among sellers who qualify for the full exemption and assume they have nothing to file. The CRA can reassess a return and deny the PRE entirely if the sale was not reported. A late-filing designation is possible in some circumstances, but the CRA charges a penalty for it — as of writing, calculated per month of delay up to a maximum — and the amounts can add up quickly. Confirm current penalty figures with the CRA or a tax professional.

Using the wrong ACB

The adjusted cost base is not just the purchase price. Sellers frequently forget to add legal fees paid at purchase, land transfer tax, or the cost of eligible capital improvements. A lower ACB produces a larger apparent gain, which can mean more tax than is actually owed.

Missing renovation receipts

The Income Tax Act allows you to add the cost of capital improvements to your ACB, reducing a taxable gain. But "I think we spent about $40,000 on the kitchen" is not enough — the CRA expects documentation. Keep contractor invoices, building permits, and bank records for as long as you own the property and for several years after.

Mixed-use properties

If you rented part of your home (a basement apartment, an Airbnb suite) or converted it to full rental use at any point, the PRE may not apply to all the years you owned it. The calculation becomes more involved, and the stakes are higher. This is squarely in professional-advice territory.

Frequently asked questions