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Reporting the Sale of Your Home on Your Tax Return in Ontario

Sold your principal residence? See whether you must report it, how Schedule 3 and Form T2091 work, and what happens if you miss it.

Real Estate5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • You must report the sale on Schedule 3 and Form T2091 even if the home was your principal residence for every year you owned it.
  • You designate the property by ticking box 1 at line 17900 of Part 1 of Schedule 3.
  • A change in use is a deemed disposition that must also be reported.
  • If a sale was not reported, the CRA may reassess beyond the normal period for amounts tied to that sale.

Many Ontario homeowners assume that selling a principal residence needs no mention on a tax return because the gain is usually not taxed. That assumption is a common reason people end up with a letter from the CRA later.

This article walks through what you report, which forms are involved, how the exemption is calculated, and what to do if you forgot.

Do you have to report the sale?

Yes. Reporting the sale on Schedule 3 and Form T2091 is required even if the home was the principal residence for every year you owned it. It is also required for a deemed disposition such as a change in use.

The exemption is not automatic in the sense of skipping the paperwork. You claim it by reporting the sale and designating the property.

How to report it step by step

The sale is reported on Schedule 3, Capital Gains or Losses, and the property is designated by ticking box 1 at line 17900 of Part 1. Form T2091(IND) is completed and included with the return. Only page 1 is completed if the property was the principal residence for all years owned, or all but one.

How the gain and exemption are calculated

The starting point is the capital gain: proceeds of disposition minus the adjusted cost base and the outlays and expenses of the sale. Selling costs reduce the gain and cannot be deducted from other income.

The principal residence exemption then reduces the gain using a formula: A − (A × B/C) − D. A is the gain otherwise computed. B is the number of years after acquisition that the property was your principal residence and you were resident in Canada, plus one if you were resident in the acquisition year. C is the number of years after acquisition that you owned the property. D applies only to properties acquired before February 23, 1994, where a subsection 110.6(19) election was made; otherwise it is zero.

If the home was your principal residence for every year, the result is generally no taxable gain. If it was not, part of the gain may be taxable, and half of any capital gain is generally included. Only one home can be designated as the family's principal residence for each year from 1982 on.

Special situations

SituationWhat to know
You rented out the home before sellingEvery change in use is treated as a sale at fair market value unless an election applies.
Home became a rental and you want to keep the exemptionIf all of the home is converted, you can elect not to be treated as having changed its use, with the property designated for up to four years.
Only part of the home was used to earn incomeThe CRA usually treats that part as changed in use, unless the use is relatively small, there are no structural changes and no CCA is claimed.
Sold more than one former home in the same yearA separate Form T2091(IND) is filed for each property.
Loss on deemed sale of your own homeA loss on a deemed sale of your own home on change in use cannot be claimed.

Where the property was bought mainly to sell for profit, the principal residence exemption may not help, and the profit can be taxed as business income.

If you forgot to report

The penalty for a late-filed election or designation is the lesser of $8,000 and $100 for each complete month from the original due date to the date of the request. The Minister may extend the time for an election if you apply within ten calendar years after the end of the relevant tax year. The CRA says it may accept a late principal residence designation in certain circumstances, but a penalty may apply.

If a real estate disposition was not reported, the CRA may reassess beyond the normal reassessment period, limited to amounts related to that disposition. Acting early is usually better than waiting.

What to do next

Frequently asked questions

Do I report the sale of my home if I owe no tax?

Yes. Reporting on Schedule 3 and Form T2091 is required even if the home was your principal residence for every year you owned it.

Where do I tick the principal residence box?

On Schedule 3, you designate the property by ticking box 1 at line 17900 of Part 1. Form T2091(IND) is then completed and included with the return.

Do I need a form for each property I sold?

If you sold more than one former principal residence in the same year, a separate Form T2091(IND) is filed for each property. Only one home can be designated for each year.

What if I never reported a sale from a past year?

The CRA may reassess beyond the normal period for amounts related to that disposition. A late designation may be accepted in certain circumstances, but a penalty may apply. A lawyer or accountant can help you decide how to correct it.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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