October 31, 2025
Effective October 31, 2025, all online transactions for the Assessment Review Board require Multi-Factor Authentication.
When users make payments through the Ontario Public Service payment service (CCPAY), they may be prompted by their financial institution to verify their identity using a One-Time Passcode. This passcode will be sent by their financial institution to the mobile device or email address they have registered with their financial institution, ensuring a secure and reliable authentication process.
October 28, 2025
Due to scheduled maintenance, the ARB’s e-services will be unavailable from Friday October 31, 2025 at 5:00 p.m. until November 1, 2025 at 8:00 p.m. We apologize for any inconvenience and appreciate your understanding.
If you have any questions, please contact the ARB.
September 26, 2025
Due to a service disruption at Canada Post, mail services will be impacted at our tribunals. Parties are asked to use online options such as e-filing portals where available, or email.
If email or online options are not available, parties may also use courier services to send their documents. If you, or a party, are waiting to receive documents from a tribunal, email or a courier may be used.
If you have any questions, please contact the tribunals.
Tax Calculator
Are you thinking of applying to the Assessment Review Board (ARB) to lower your property assessment but not sure how much money you could save?
Review MPAC’s Property Assessment and Taxation Toolkit.
Use the tax calculator tool to estimate possible savings.
You will need your:
- Municipal Property Assessment Corporation (MPAC) Notice of Assessment
- recent municipal tax bill or another tax issuer in unorganized territories
* These fields are mandatory.
The calculator takes the difference between the MPAC assessment value and what you believe your property assessment should be and multiplies it by the tax rate provided.
Results
Difference Amount:
$ 0
Possible Savings Amount:
$ 0
Note: The savings amount above is only an estimate calculated from the numbers entered. If you used incorrect information, your potential savings could change.
Submitting an appeal to the ARB does not guarantee a change in the assessed value of your property. If your assessment value does not change, there will be no savings on your property tax bill.