Nadia sells the home she has lived in for years. After the mortgage and closing costs are paid, she puts the remaining cash toward her next place. She assumes there is nothing to give her tax preparer because it was her home.
The expected exemption does not remove the reporting step.
Put the sale in the tax folder
For sales from 2016 onward, the CRA requires reporting and a principal-residence designation to claim the exemption. The return uses Schedule 3 and Form T2091(IND), with the details depending on the circumstances.
Nadia keeps the purchase and sale closing statements, acquisition year, property address and ownership information. She also saves records of major capital improvements and any earlier change in use.
The cash left after repaying a mortgage is not the same as the property's capital gain. Debt repayment is a financing transaction, so the bank deposit cannot replace the purchase and sale records.
For example, suppose the selling price is $600,000, the adjusted cost base is $400,000 and selling expenses are $20,000. The gain before any exemption is $180,000. A remaining $250,000 mortgage does not reduce that gain. The designation then determines how much, if any, is exempt.
Reconstruct how the home was used
Nadia lists the years she lived there and confirms whether it was ever rented or used for business. She checks whether her family owned another property that might also qualify for designation during overlapping years.
A principal-residence claim is not simply a box labelled "I lived here once." Ownership, ordinary habitation, family designations and residence history can affect the result. Only one property per family unit can be designated for a given year under the current rules; owning a cottage or another home makes the choice worth checking before filing.
Check a sale within the first year separately
For a Canadian home owned for less than 365 consecutive days, the residential property flipping rule can treat the profit as business income, which cannot use the principal residence exemption. Specified life events can provide exceptions, including an eligible relocation or a serious illness. Keep evidence of the event and why it caused the sale.
An exception, or ownership lasting at least 365 days, removes that automatic rule; it does not automatically prove that the gain is capital or exempt. The actual purpose and circumstances of buying and selling still matter.
Correct an omitted sale promptly
If the sale was left off a filed return, request a change to the return for the year of sale. Do not add the old sale to this year's return. Prepare the applicable Schedule 3 and T2091(IND), the ownership and use history, and an explanation of the omitted designation.
The CRA can accept a late designation in certain circumstances, and a penalty may apply. A sale expected to be fully exempt still needs correction; an empty capital-gains section does not preserve the exemption by itself.
Nadia's final file contains both the sale calculation and the designation supporting any exemption. That makes a no-tax result explainable instead of leaving the transaction invisible.