Can a Seller Back Out of an Accepted Offer in Ontario?

A seller gets a better offer the next day. Or a family situation changes. Or simple second thoughts set in. Whatever the reason, once an Agreement of Purchase and Sale (APS) has gone firm, an Ontario seller who wants out is not just changing their mind — they're contemplating breaking a binding contract.

That doesn't mean it never happens. It means the seller who does it needs to understand what's actually at stake, because the consequences go well beyond an awkward phone call to the buyer.

Seller backing out of an accepted offer is one of the more expensive mistakes a homeowner can make in a real estate transaction, and it's rarely as simple as just walking away.

A Firm Offer Is a Binding Contract

Ontario has no general cooling-off period for a resale home sale. Once both sides have signed the APS and any conditions (financing, home inspection, and so on) have been satisfied or waived, the agreement is firm — legally binding on buyer and seller alike. Neither party gets to reconsider simply because circumstances changed or a better opportunity appeared.

This matters because people sometimes assume a signed offer is provisional until closing day. It isn't. From the moment the deal becomes firm, the seller is contractually obligated to convey the property on the terms in the agreement.

What a Buyer Can Do When a Seller Refuses to Close

A buyer facing a seller who won't complete the sale generally has two broad paths, and the right one depends on how badly the buyer wants that specific property versus simply being made financially whole.

Real property has long been treated by Ontario courts as inherently unique, which is part of why specific performance remains a realistic remedy in real estate disputes in a way it usually isn't for, say, a contract to sell a car. That said, whether a court actually orders it depends heavily on the specific facts, and it's not a guaranteed outcome in every case.

Damages, where awarded, are generally aimed at putting the buyer in the position they'd have been in had the sale closed — which can include the cost of acquiring a comparable property if the market moved between the agreement date and the seller's refusal, plus other losses flowing directly from the breach.

Legitimate Reasons a Seller May Still Get Out

Not every seller who doesn't close has breached the contract. A seller may lawfully avoid completing if:

• A condition in the buyer's favour was never satisfied and the agreement is properly terminated as a result
• Both parties agree to a mutual release, cancelling the deal by consent
• The agreement itself was never validly formed — for example, a genuine defect in how it was signed or accepted
• A serious, undisclosed problem with title or the property justifies the seller's position under the specific terms of that agreement

These are narrow exceptions, not general escape hatches. "I found a better offer" or "I changed my mind" is not one of them.

What Happens to the Deposit

The buyer's deposit is held in trust, typically by a brokerage, pending closing or another resolution of the transaction. Where a seller — not the buyer — is the one refusing to close, the deposit dispute usually runs the other way: the buyer wants their deposit back promptly, in addition to pursuing whatever other remedy they choose. A seller who has breached the agreement is not entitled to keep a buyer's deposit as some kind of consolation.

Practical Fallout Beyond the Courtroom

Even if a seller ultimately avoids the worst-case legal outcome, backing out of a firm deal carries costs that don't show up in a judgment:

• Real estate commission may still be owed to the listing brokerage under the listing agreement, independent of whether the sale itself closes
• A second listing often performs worse — buyers and agents notice when a property reappears on the market after a collapsed firm deal
• Legal costs accumulate quickly once lawyers on both sides get involved, regardless of who ultimately "wins"
• Time — these disputes can take a long while to resolve, during which the seller's plans for the sale proceeds are on hold

If You're a Seller Having Second Thoughts

The better move, almost always, is to talk to a real estate lawyer before refusing to close — not after. A lawyer can tell you honestly whether any of the narrow legitimate exits actually apply to your situation, what a negotiated release might look like, and what exposure you're realistically facing if you go ahead anyway.

Frequently asked questions