Thorold Property Tax: Due Dates, Penalties, and Appeals

Property taxes in Thorold are billed in four installments in 2026, due February 27, April 30, June 30, and August 31, with the final two installments requiring payment by 4:30 p.m. Any balance not paid by the due date is charged a penalty of 1.25% per month, and the tax clerk has no authority to waive it.¹ Your bill is calculated by multiplying the value MPAC has assigned your property by the combined city, regional, and education tax rates.

What Your Bill Pays For

Every Thorold tax bill is made up of three separate levies, each set by a different body. Ontario’s Municipal Act requires them to appear as distinct line items on the tax roll.²

The City of Thorold levy funds local services: road repairs, snow removal, parks, fire services, and municipal administration.
The Regional Municipality of Niagara levy covers policing, public health, waste management, and regional infrastructure shared across Niagara’s municipalities.
The education levy is set by the Province of Ontario, not local council. For 2026, the residential education tax rate is 0.153% of assessed value.³

Council approves the city and regional rates during the annual budget cycle. Once finalized, Thorold posts the combined rates on its property taxes page.¹

2026 Installment Due Dates

Thorold splits the year into an interim bill and a final bill. The interim bill goes out early in the year and uses the previous year’s rates; the final bill reconciles to the actual 2026 rates once budgets are set. Payments for 2026 are due on:¹

Interim installment 1: Friday, February 27, 2026
Interim installment 2: Thursday, April 30, 2026
Final installment 1: Tuesday, June 30, 2026 by 4:30 p.m.
Final installment 2: Monday, August 31, 2026 by 4:30 p.m.

Not receiving a bill in the mail does not excuse a missed payment. If your bill hasn’t arrived and a date is approaching, contact the tax department rather than wait.¹

How to Pay

The city accepts several forms of payment, but each has its own processing window. Payment must be received by 4:30 p.m. on the due date to avoid penalties, so build in a buffer.⁴

Online or telephone banking through your financial institution. Search for “Thorold” as the payee and use your 19-digit roll number as the account number. Allow up to ten business days for the payment to reach the city.
Credit card (Visa or MasterCard) by phone at 1-855-619-2400 or through the city’s online portal. A 1.75% convenience fee applies, with a $10,000 maximum per transaction.
In person at City Hall, 3540 Schmon Parkway, Monday to Friday, 8:30 a.m. to 4:30 p.m.
Mail slot at the front entrance of City Hall for cheque payments only. It is emptied at 4:30 p.m.; anything dropped in after that on a due date is late.
Canada Post to P.O. Box 1044, Thorold ON, L2V 4A7. Include your stub and write your tax account number on the cheque. Post-dated cheques are accepted.
Pre-authorized payment plan, either withdrawn on the four installment dates or spread across 11 monthly withdrawals from September through August (no December withdrawal). Only the property owner can enroll, and both the tax account and water/sewer account must be paid in full at enrollment.
Mortgage company, if your lender collects taxes with your mortgage payments. Forward the tax notice to them and let the city’s tax department know.

If you have ever forgotten a due date, the pre-authorized plan removes the risk entirely. Enrollment is handled by the Finance Department at City Hall.⁵

What Happens If You Pay Late

A penalty of 1.25% is added to any overdue balance on the first day of each calendar month it remains unpaid. Over a year, that compounds to roughly 15%. The tax clerk cannot waive the charge for any reason, including a lost bill or a banking delay.¹

Longer arrears escalate. Under Ontario’s Municipal Act, the city can register a tax arrears certificate against the property’s title. Once that certificate is registered, the owner has a fixed redemption period to pay the full outstanding amount. If the window closes without payment, the property becomes eligible for a public tax sale.⁶ Tax sales are uncommon, but the process continues regardless of the owner’s circumstances once it starts. If you cannot pay, contact the city before penalties compound.

How Your Assessed Value Is Set

The Municipal Property Assessment Corporation (MPAC) sets the assessed value for every property in Ontario, using lot size, building area, location, and recent comparable sales.⁷ The city multiplies that value by the combined tax rate to produce your bill.

One quirk worth knowing: assessments for the 2026 tax year are still based on a January 1, 2016 valuation date. Ontario has repeatedly delayed the province-wide reassessment, so 2016 values remain in effect.⁸ If your home’s market value has climbed sharply since 2016, your assessed value likely sits well below today’s sale price. That gap will close whenever the province completes a reassessment cycle.

Your Property Assessment Notice includes a 19-digit roll number and an access key. The roll number is required for nearly every tax transaction, from paying online to filing an appeal. The access key lets you log in to MPAC’s AboutMyProperty portal to see your assessment details and comparable properties nearby.⁹

Challenging Your Assessment

If you think MPAC’s value is wrong, residential owners must first file a free Request for Reconsideration (RfR) with MPAC before any appeal to the Assessment Review Board is possible. The RfR can be submitted online through AboutMyProperty or by mail.¹⁰

The RfR deadline for the 2026 tax year is March 31, 2026. MPAC typically responds in writing within 180 days, or up to 240 days for complex reviews.¹⁰

If you disagree with the decision, you have 90 days from the date of MPAC’s written response to file an appeal with the Assessment Review Board. For residential, farm, managed forest, and conservation land properties the filing fee is $132.50 per roll number, with a $10 discount for electronic filing.¹¹ Because MPAC’s benchmark is the 2016 valuation date, evidence of comparable sales from that period is what strengthens a case.

Relief Programs

The Niagara Region runs a tax deferral program for low-income seniors and persons with disabilities. This is a deferral, not forgiveness: the postponed amount stays owing and is eventually collected. It applies only to the portion of a year-over-year tax increase that exceeds $200.¹²

To qualify, seniors must be 65 or older and receiving the monthly Guaranteed Income Supplement under Part II of the federal Old Age Security Act. Persons with disabilities must be receiving ongoing benefits through the Ontario Disability Support Program. In both cases you must own and occupy the property as your principal residence, have owned a home in Niagara for at least one year, and be current on your taxes. Applications are annual, due February 28 of the year following the tax year.¹²

Registered charities occupying commercial or industrial space receive a rebate of at least 40% of the property taxes on that space, with proof of CRA registration. Applications for the current tax year are accepted between January 1 of that year and February 28 of the following year, and are processed through the local municipality’s treasurer.¹³

1
City of Thorold. Property Taxes
2
Ontario.ca. Municipal Act, 2001, S.O. 2001, c. 25
3
Ontario.ca. O. Reg. 400/98 Tax Matters – Rates for School Purposes
4
City of Thorold. Payment Options
5
City of Thorold. Payment Options – Section: Pre-Authorized Payment Plans
6
Ontario.ca. O. Reg. 181/03 Municipal Tax Sales Rules
7
Public Appointments Secretariat. Municipal Property Assessment Corporation
8
Municipal Property Assessment Corporation. Notices and Notifications
9
Municipal Property Assessment Corporation. About My Property
10
Municipal Property Assessment Corporation. How to File a Request for Reconsideration
11
Tribunals Ontario. Filing an Appeal
12
Niagara Region. Property Taxes – Niagara Region – Section: Tax Relief Programs
13
Niagara Region. Tax Rebates for Charitable Organization Application Form