Property tax arrears in Ontario start the moment you miss an installment date, and the cost climbs quickly: penalties and interest of up to 1.25% a month, a lien that outranks your mortgage, and after about three years of nonpayment the municipality can register a certificate against your title and sell the property to recover what you owe. You can stop the process at almost any point by paying what’s owed, but the window closes for good one year after that certificate is registered.
How Fast the Debt Grows
On the first day a payment is late, your municipality can add a penalty of up to 1.25% of the overdue amount. Interest of up to 1.25% then accrues on the first day of every month the balance stays unpaid. Section 345 of the Municipal Act, 2001 sets those caps, and most municipalities charge the full amount.1Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 345
At the maximum rates, the effective annual cost on an unpaid balance tops 15%. Each new charge is folded into the taxes owing, though the statute blocks the municipality from charging interest on the penalty and interest amounts themselves. Municipal staff cannot waive these charges. No court order is needed for them to accumulate; they just do.
The Lien That Beats Your Mortgage
Section 349 of the Municipal Act makes unpaid taxes a “special lien” on the land that ranks ahead of every other claim, privilege, lien, or encumbrance except those of the Crown.2Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 349 Your mortgage lender sits behind the municipality.
That is why lenders watch tax accounts closely, and why many mortgage agreements let the lender pay the arrears directly and add the amount to your loan balance, or accelerate the mortgage, the moment they discover a shortfall. Some lenders avoid the problem entirely by collecting property tax installments with your regular mortgage payment.
When a Tax Arrears Certificate Gets Registered
Under section 373 of the Municipal Act, the treasurer must register a tax arrears certificate against your title when any portion of the taxes from the third year before the current year remains unpaid. In practice, that works out to about three years of delinquency before the certificate hits your title.3Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 373
Registration is a serious event. It puts a public notice on title that the municipality has begun the process of taking the property. The certificate encumbers your title, which makes selling or refinancing through conventional channels effectively impossible, and it starts the clock on the forced sale.
Who Gets Notice
Within 60 days of registration, the treasurer must send notice to the assessed owner, to anyone who appears on title as holding a registered interest (such as a mortgage lender or judgment creditor), and to the owner’s spouse.4Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 374 Section 22 of the Family Law Act gives the spouse the same right to receive notice and to redeem the property as the owner.5Government of Ontario. Family Law Act, R.S.O. 1990, c. F.3 – Section 22 If the treasurer cannot find an address after a reasonable search, or the person has expressly waived notice, the obligation to notify that person is excused.
A faster process under section 373.1 applies when land has been forfeited to the Crown after a corporation dissolved; those cases run on a 30-day notice period and a 90-day redemption window. Property held by an individual owner follows the standard timeline below.
The One-Year Window to Save the Property
Once the certificate is on title, you have one year to stop the sale. The amount you need to pay is the “cancellation price,” defined in section 371. It covers all tax arrears, all current taxes owing, all interest and penalties, and the municipality’s reasonable costs of pursuing collection, which can include legal fees, title search expenses, the cost of preparing an extension agreement, survey costs, and a reasonable allowance for future advertising.6Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 371
Anyone can pay the cancellation price and have the certificate cancelled, not just the owner. A mortgage lender, a spouse, a family member, or any other interested party can step in and stop the sale.7Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 375 The municipality will give you a written statement of the exact cancellation price on request. If the full amount is not paid before the one-year anniversary of registration, the sale proceeds.
Extension Agreements: The Payment Plan Option
After the certificate is registered but before the one-year redemption period expires, the municipality may enter into an extension agreement under section 378. It is a structured payment plan that effectively buys you more time to pay the cancellation price.8Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 378
An extension agreement is available not only to the owner but also to a spouse, a mortgage lender, a tenant in occupation, or anyone the treasurer is satisfied has an interest in the property. Two features matter most:
- The agreement cannot reduce the cancellation price. You still owe the full amount.
- Anyone can pay the full cancellation price at any time during the agreement and cancel the certificate immediately.
The key benefit: time spent under a valid extension agreement does not count toward the one-year deadline for the tax sale. The clock pauses while you are making payments. If you complete the terms, the treasurer registers a cancellation certificate and the threat of sale ends. The municipality is not required to grant one, so approach the treasurer with a credible repayment plan as soon as the certificate is registered.
What Happens at the Tax Sale
If the redemption period ends without payment, the municipality sells the property, usually by public tender (sealed bids) rather than auction. The treasurer must advertise the sale once in The Ontario Gazette and once a week for four weeks in a local newspaper, naming the property’s legal description and the minimum tender amount, which is the cancellation price as of the first day of advertising.9Government of Ontario. O. Reg. 181/03 – Municipal Tax Sales Rules – Section 5 The entire process is administrative. No court order is needed to transfer the property.
The successful bidder receives a tax deed. When registered, it vests fee simple ownership free and clear of almost every prior interest in the land. Mortgages, executions, and other registered encumbrances are wiped out. Section 379 preserves only a short list of exceptions: easements and restrictive covenants that run with the land, Crown interests, and title acquired by neighbouring landowners through adverse possession.10Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 379 A bank holding a $300,000 mortgage loses its security entirely if it fails to pay the arrears or bid at the sale.
Where the Sale Money Goes
Section 380 fixes the order of payment. The cancellation price is paid first, which reimburses the municipality for all arrears, interest, penalties, and costs. Anything left goes to persons who held registered interests in the land, in their legal order of priority. The former owner is last in line.11Government of Ontario. Municipal Act, 2001, S.O. 2001, c. 25 – Section 380
Any surplus beyond the cancellation price is paid by the treasurer into the Superior Court of Justice, along with a statement of who may have a claim to the funds. Former owners and lenders who lost their security can apply to the court for a share.
Deferral Programs Before You Fall Behind
If limited income is driving the arrears, check whether your municipality has a property tax deferral program before you reach the certificate stage. Many Ontario municipalities offer programs for seniors and people with disabilities that postpone some or all of the annual tax, with eligibility rules and deferral amounts that vary by municipality.
Ottawa, for example, offers a full deferral for low-income seniors (65 and older) and low-income residents with disabilities whose property assessment does not exceed $498,000 and whose total household income is $59,397.64 or less, with interest on deferred amounts charged at 5% annually rather than the standard 15% effective rate.12City of Ottawa. Full Property Tax Deferral Program Deferred amounts become due when the property is sold, the owner moves out, or eligibility ends. Applications typically must be submitted by September 30 of the tax year, so waiting until arrears are critical often means missing the window.