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Mortgage Penalty When Selling Your Home in Ontario: Discharge Explained

Learn how Ontario lenders calculate a prepayment penalty when you sell, what porting means, and how your mortgage is discharged at closing.

Real Estate5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • Paying off a whole mortgage because you sell can trigger a prepayment penalty.
  • A penalty is usually the higher of three months' interest or the interest rate differential.
  • The Interest Act and Mortgages Act give a right to pay out after five years for three months' interest, but only for mortgages not payable until more than five years after their date.
  • If a lender cannot be found to sign a discharge, a court can order the mortgage discharged after payment into court.

If you are selling a home that still has a mortgage, that mortgage has to be paid out on closing so the buyer gets the property free of it. Many sellers are surprised to learn that the lender may charge a penalty for ending the mortgage before the term is up.

This article explains in plain terms how the penalty is usually worked out, the few situations where the law gives you a way out, and how the discharge fits into your closing. It is general information. Your own mortgage contract controls the details, so read it or ask your lender before you list.

Why selling can trigger a penalty

Paying off an entire mortgage early, including because you sell the home, can trigger a prepayment penalty. The penalty is the lender's charge for ending the loan before the agreed term finishes. It is not a government fee, and it is separate from the other costs of selling your home.

Most mortgage terms are five years or less. In a typical one-to-five-year term, the law does not give you a right to pay out for a fixed small charge, so the penalty set out in your contract usually governs the payout on a sale. Corporate borrowers and certain other prescribed borrowers are treated differently under the federal rule.

How the penalty is usually calculated

A prepayment penalty is usually the higher of three months' interest on what you still owe or the interest rate differential, often called the IRD. Lenders usually use the IRD when your rate is higher than current rates and you signed less than five years ago.

The Financial Consumer Agency of Canada gives this example: on $200,000 at 6% with 36 months left and a posted rate of 4%, three months' interest is $3,000 and the IRD is $12,000, so the penalty is $12,000, plus possibly an administration fee. Lenders use different formulas for the comparison rate, so your own number may differ from a simple example.

Penalty methodWhen it is usually used
Three months' interest on the balance owingThe usual floor; it applies when it is the higher amount
Interest rate differential (IRD)Usually when your rate is higher than current rates and you signed less than 5 years ago

When the law gives you a right to pay out

Under the federal Interest Act, where a mortgage on real property is not payable until more than five years after its date, the borrower may, after five years, pay the amount due plus three months' interest in lieu of notice, and no further interest is chargeable. Ontario's Mortgages Act has a matching five-year rule: principal and interest owed plus three months' further interest.

The Mortgages Act also says a borrower paying principal early must give at least three months' notice in writing unless they pay three months' interest in lieu of notice. Whether these rules help you depends on the length of your mortgage and who the borrower is, so have a lawyer read your mortgage before you assume either way.

Porting and other ways to reduce the hit

Porting means moving your existing mortgage to a new home. It is only an option if you are buying another home, and you should ask your lender whether it is allowed. Timing between the sale and the purchase, and the terms of the ported mortgage, are matters to settle with the lender directly.

How the discharge is handled at closing

How the payout and the release of the lender's registered mortgage are handled on closing depends on your lender and your situation, so it is worth confirming the steps with your lawyer well ahead of time. The amount paid to the lender comes off what you receive from the sale. This is why you want the penalty confirmed well before closing day, not on it.

If a mortgagee cannot be found, or a proper discharge cannot be obtained without undue delay, the court may permit payment into court and order the mortgage discharged. Registering that order has the same effect as registering a certificate of discharge signed by the mortgagee. This is uncommon and takes legal steps, so a lawyer should guide it.

What to do next

Frequently asked questions

Will I always pay a penalty if I sell with a mortgage?

Not always, but paying off the whole mortgage because you sell can trigger one. Whether it applies, and how much, depends on your contract and how much of the term is left. Ask your lender for a written payout quote.

What is the interest rate differential?

It compares your mortgage rate with a current rate for the time left in your term. Lenders usually use it when your rate is higher than current rates and you signed less than five years ago, and the penalty is usually the higher of the IRD or three months' interest.

Can I avoid the penalty by giving notice?

The Mortgages Act requires at least three months' written notice for early principal payment unless you pay three months' interest instead. That does not necessarily remove a penalty set by your contract, so confirm with a lawyer.

What if the lender will not sign the discharge?

If a mortgagee cannot be found or a proper discharge cannot be obtained without undue delay, a court may allow payment into court and order the mortgage discharged. Speak with a lawyer early if you expect this problem.

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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