There is no legal minimum holding period in Ontario, so you can sell a house the day after you buy it. The real limit is cost, because selling a house within the first year of ownership triggers tax and mortgage consequences that will usually swallow whatever gain you made.
The largest of these is the federal residential property flipping rule, which took effect on January 1, 2023. If you owned a housing unit in Canada for fewer than 365 consecutive days before selling it, the profit is automatically treated as business income instead of a capital gain. That hurts in two directions at once. Business income is fully taxable at your marginal rate rather than the partial inclusion that applies to capital gains on an Ontario home sale, and the principal residence exemption is denied outright, even if the house was genuinely where you lived.
The rule does bend for real life. A sale connected to a death, a serious illness or disability, a marriage or common-law breakdown, a new addition to the household, insolvency, a threat to personal safety, an involuntary job loss, or a work relocation that puts you at least 40 kilometres closer to a new workplace can fall outside the rule. None of that applies on its own. You have to claim the exception on your tax return, and the Canada Revenue Agency will expect documentation supporting it.
What an early sale actually costs
Then there is the mortgage. Breaking a closed mortgage before the end of its term means a prepayment charge, and on a fixed-rate mortgage that charge is calculated as the greater of three months of interest or the interest rate differential. Early in a term, the differential figure can run into five digits. Our explainer on how mortgage prepayment penalties are calculated walks through the arithmetic.
Everything else is money you already spent. Land transfer tax, and in the City of Toronto a second municipal land transfer tax on top of the provincial one, is not refundable when you sell. Neither are your legal fees. Sell again quickly and you add real estate commission, HST on that commission, and a second set of legal fees. Toronto price growth over twelve months rarely covers that much friction.
Most owners need a few years for the numbers to work. Anyone facing a sale inside the first year should talk to an accountant before listing rather than after closing.
Related reading: Do You Pay Capital Gains Tax Selling Your Ontario Home?, How Mortgage Prepayment Penalties Work in Canada, and What Are the Costs of Selling a Condo in Toronto?
