- Once an Agreement of Purchase and Sale is firm — all conditions satisfied or waived — both sides are bound to complete the transaction on the agreed terms.
- The buyer's deposit, held in trust pending closing, is typically the seller's first source of recovery.
- At its core, the shortfall is the gap between what the original buyer agreed to pay and what the seller actually received on the resale — but courts and lawyers typically look at more…
A firm Agreement of Purchase and Sale falls apart on closing day — not because the seller changed their mind, but because the buyer simply doesn't show up with the funds. Financing collapsed, cold feet set in, or something else went wrong on their end. The seller is now holding a property they'd already arranged to sell, often with a new purchase or move of their own already in motion.
The natural next step is to put the property back on the market. If it sells for less than the original buyer had agreed to pay, many sellers ask the same question: can I make that buyer pay the difference?
Often, yes — a seller sue buyer for shortfall claim is a well-established remedy in Ontario real estate law. But what a seller can actually recover, and how a court gets to that number, involves more moving parts than just subtracting one sale price from another.
Why a Buyer's Default Creates a Damages Claim
Once an Agreement of Purchase and Sale is firm — all conditions satisfied or waived — both sides are bound to complete the transaction on the agreed terms. A buyer who simply fails to close without a legal excuse is in breach of contract, and a seller in that position generally has the same kinds of remedies available as a buyer would have against a defaulting seller: pursue completion of the sale in limited circumstances, or, far more commonly in practice, resell the property and pursue the defaulting buyer for the resulting loss.
Reselling and claiming the shortfall is the practical path most sellers take, since forcing a specific, no-longer-willing buyer to complete a purchase is rarely realistic or worthwhile.
What Happens to the Deposit First
The buyer's deposit, held in trust pending closing, is typically the seller's first source of recovery. Where the buyer is the party in breach, the seller is generally entitled to have that deposit released to them, or applied against the loss, rather than returned to the defaulting buyer. The deposit doesn't disappear from the damages calculation — it's usually credited against whatever shortfall the seller goes on to prove, not kept as a separate windfall on top of full damages.
How the Shortfall Is Calculated
At its core, the shortfall is the gap between what the original buyer agreed to pay and what the seller actually received on the resale — but courts and lawyers typically look at more than that single number.
| Component | What It Reflects |
|---|---|
| Price difference | Original contract price minus the resale price |
| Carrying costs | Mortgage interest, property tax, insurance, and utilities incurred while the seller held the property longer than planned |
| Resale expenses | A second round of real estate commission, legal fees, and marketing costs tied to the new sale |
| Deposit credit | The original deposit, generally applied against the total loss rather than added on top |
Not every cost a seller incurs is automatically recoverable — the claim still has to be proven, and it has to flow reasonably from the buyer's breach rather than from unrelated decisions the seller made along the way.
The Seller's Duty to Mitigate
A seller pursuing a shortfall claim doesn't get a blank cheque. Ontario law expects a party who suffers a breach to take reasonable steps to limit their own loss — this is the duty to mitigate, and it applies to sellers just as it applies to buyers in the reverse situation.
In practice, that means:
- Relisting and marketing the property within a reasonable time, rather than letting it sit
- Accepting a genuinely reasonable offer, rather than holding out indefinitely for a price closer to the original deal
- Not artificially inflating the loss through delay, an unusually low resale price, or unnecessary costs
A defaulting buyer facing a shortfall claim can challenge the seller's conduct on exactly these points. If the seller took an unreasonably long time to resell, or sold well below what the market would reasonably have supported at the time, a court can reduce the damages awarded to reflect what a properly mitigated loss would have looked like.
Timing Matters More Than Sellers Expect
The gap between the failed closing and the successful resale is often the single most scrutinized part of one of these claims. A resale completed reasonably promptly, at a price supported by market conditions at the time, gives the seller's shortfall calculation real credibility. A resale that drags on for months, especially in a shifting market, invites the defaulting buyer to argue that later market movement — not their original breach — explains some or all of the difference.
This is one of several reasons sellers in this position are generally well served getting legal advice early, before relisting, rather than after a dispute over the numbers has already hardened.
Frequently asked questions
Can a seller keep the deposit and still sue for the full shortfall on top of it?
Generally no. The deposit is typically treated as a credit against the total loss the seller proves, not as a separate amount collected in addition to full damages. A seller recovers their actual loss, with the deposit counted toward it.
What if the resale actually sells for more than the original price?
If the resale price meets or exceeds the original agreed price, there's typically no shortfall to claim, since the seller hasn't suffered that particular loss. Other costs directly tied to the buyer's default may still be worth discussing with a lawyer depending on the specifics.
Is it worth suing if the defaulting buyer doesn't have much money?
That's a practical, not just a legal, question. A court can award a judgment even against a buyer with limited assets, but collecting on it is a separate matter. A lawyer can help you weigh the likely recovery against the cost and time of pursuing a claim.
Does the seller have to resell before suing, or can they sue right away?
In practice, quantifying a shortfall claim usually depends on having an actual resale price to compare against the original contract price. Sellers typically resell first, then pursue the defaulting buyer for the documented difference and related losses.
This is a real estate question
Start a file online — flat, published fees, reviewed by a licensed Ontario lawyer before a dollar is owed.