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Mortgage Default Interest and Penalty Fees in Ontario

Learn what extra interest and fees a lender can add when you fall behind on your Ontario mortgage, and how the Interest Act limits them.

Real Estate7 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • The federal Interest Act does not allow a mortgage lender to charge a higher rate on arrears than the rate payable on principal that is not in arrears.
  • Fees are treated differently from interest: the Court of Appeal has allowed substantiated late-payment charges but disallowed unexplained professional and administrative fees.
  • You can give written notice requiring the lender to state the amount in default and the expenses it has incurred, and it must respond within 15 days.
  • Private mortgages are also subject to the Criminal Code limit of 35 per cent APR for most personal borrowing, and fees count toward that rate.

Missing a mortgage payment rarely costs you only the payment. Letters often follow that add interest, a late charge, legal fees or an administration fee, and the balance can grow faster than you expected. It is fair to ask which of those charges the lender is actually entitled to.

This article explains the main rules that limit what a lender can add when you are in arrears on an Ontario mortgage, which charges courts have looked at, and how to ask for a clear breakdown. It is general information, not advice on your own mortgage. The outcome in any case depends on your mortgage documents and what the lender can prove.

What the Interest Act says about interest on arrears

People often use the phrase default interest to mean a higher rate that applies once you miss payments. In Ontario, the main limit on that idea is the federal Interest Act, which applies to mortgages on real property.

Section 8(1) says that no fine, penalty or rate of interest may be stipulated for or taken on arrears of principal or interest secured by a mortgage on real property if it increases the charge on the arrears beyond the rate payable on principal not in arrears. Section 8(2) adds that a mortgage may validly provide for interest on arrears at a rate not greater than the rate payable on principal not in arrears.

In plain words, a lender can charge the ordinary contract rate on your missed payments, but not a higher penalty rate on them. That rule is about the rate on arrears. It is not a rule that a lender can never charge any fee, which is why the next section matters.

Fees, penalties and what the courts have allowed

The Ontario Court of Appeal has looked at several kinds of added charges. In one decision it upheld the disallowance of unexplained professional and administrative fees that a lender added to the discharge amount, but it allowed late-payment charges that were substantiated and did not offend the Mortgages Act or the Interest Act. The court said a lender must be able to justify its legal fees and that the standard charge terms are not a carte blanche to incur and charge fees.

In another decision the Court of Appeal held that a three-month interest compensation charge did not violate section 8 of the Interest Act, and it rejected an argument that receivership-related fees were a penalty. Taken together, these decisions show that outcomes turn on the facts and on what the lender can substantiate.

Acceleration is another source of confusion. The standard charge acceleration clause lets a lender demand the principal on default, but the Court of Appeal held that it does not entitle the lender to future, unearned interest; the lender was entitled only to interest accrued to the date of default.

Type of chargeWhat to know
Higher rate on missed paymentsLimited by section 8 of the Interest Act to no more than the rate on principal not in arrears
Late-payment or returned-payment chargeSubstantiated late-payment charges have been allowed; a sample bank disclosure box shows a $50 default charge and a $40 returned-payment fee
Legal or administrative fees added to a payoutThe lender must be able to justify them; unexplained fees have been disallowed
Three-month interest chargeHeld in one case not to violate section 8
Future interest after accelerationOnly interest accrued to the date of default was recoverable in one case

Asking for a written statement and disputing charges

You do not have to guess what the lender says you owe. Under section 22(2) of the Mortgages Act, a mortgagor can give written notice requiring the mortgagee to provide a written statement of the principal or interest in default, the nature of the default, and the amount of expenses necessarily incurred. The lender must respond within 15 days after receiving the request, and if it fails without reasonable excuse, or the statement is incomplete or incorrect, its enforcement rights are suspended until it complies.

That suspension has limits. A lender's non-compliance does not invalidate a purchaser's title in a power of sale, and the suspension stops the right to enforce without removing the lender's substantive rights. Your remedy for an improper sale is against the lender. So treat the statement as a tool for clarity and leverage, not as a way to make the debt go away.

If you still disagree with a charge, the courts are open to you. The Court of Appeal rejected the argument that an assessment under section 43 of the Mortgages Act was the only route for disputed charges, and held that the court hearing the application could decide all issues, including whether added fees were legitimate.

Private lenders and the criminal interest rate

If your mortgage came from a private lender, the Criminal Code adds another limit. Entering into an agreement to receive interest at a criminal rate, or receiving it, is an offence punishable on indictment by up to five years in prison or on summary conviction by a fine of up to $25,000. A criminal rate is an annual percentage rate, calculated under generally accepted actuarial practices, that exceeds 35 per cent on the credit advanced.

Interest for this purpose means all charges and expenses paid or payable for advancing credit, including fees, fines, penalties and commissions, so it is not limited to the stated rate. Fees taken off the advance reduce the credit advanced and raise the effective rate. Some commercial loans to non-individuals borrowing for business purposes are exempt, but loans to individuals for personal purposes stay under the 35 per cent cap. Whether a particular loan crosses the line needs a proper calculation, ideally by a lawyer.

Mortgage brokers and agents in Ontario must give written disclosure, and private lenders must receive the prescribed disclosure signed by a licensed broker, with fees paid to the brokerage and disclosed in writing. Ask to see those documents if you are unsure what you agreed to.

What to do next if you are in arrears

Default can eventually lead to a forced sale, so it helps to act early. Under a mortgage's own power of sale clause, the borrower must be in default at least 15 days before notice, and the lender must give at least 35 days' notice of intention to sell to everyone with an interest in the property. If the mortgage has no power of sale clause, the statutory power of sale applies after three months' default in payment and 45 days' notice. Notices of sale use the prescribed Form 1, Notice of Sale under Mortgage.

Frequently asked questions

Can my lender charge a higher interest rate because I missed payments?

Not on the arrears. The Interest Act does not allow a rate or penalty on arrears that increases the charge beyond the rate payable on principal not in arrears. The lender can charge the ordinary contract rate on missed payments.

Can the lender add its legal fees to what I owe?

Sometimes, but it must be able to justify them. The Court of Appeal has upheld the disallowance of unexplained professional and administrative fees added to a discharge amount. Ask for a breakdown and invoices.

How do I find out exactly what I owe?

You can give written notice requiring the lender to state the principal or interest in default, the nature of the default and the expenses necessarily incurred. The lender must respond within 15 days of receiving the request.

Does the lender get all the future interest if it accelerates my mortgage?

Not under the standard charge acceleration clause as the Court of Appeal read it. The lender could demand the principal but was entitled only to interest accrued to the date of default, not future unearned interest.

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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