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Property Assessment

The valuation of a property for tax purposes is called "property assessment". This pages answers some common questions about how assessments are determined, and the process for appealing them.

Where Does the City get the Information to Issue Tax Bills??

The Municipal Property Assessment Corporation (MPAC) is responsible for administering all valuation of properties in the City of Cornwall. MPAC is located at 132 Second Street East, Cornwall, Ontario, K6H 1Y4 or call 1-866-296-6722.

The City of Cornwall then calculates the tax bills based on information supplied by MPAC. In the case of a new house, when there is a delay in receiving the information from MPAC, the City cannot issue a tax bill. This delay can be considerable, with some people not receiving a tax bill which includes the house for as long as two years after occupancy. For more information, including an estimate of your annual property taxes, please contact the  Billing and Collection Section at 613-930-2787 ext. 2342 or 2356.

What If I Have A Question?

For valuation and assessment information about your property, call the Municipal Property Assessment Corporation office at 1-866- 296-6722 or visit their website at

How MPAC Assesses Properties.

When assessing a residential property, MPAC takes into consideration key features that affect its market value.  Five major factors that usually account for 85% of the value are:  location, lot dimensions, living area, age of the structure(s), adjusted for any major renovations or additions; and quality of construction.  Examples of other features that may affect your property's value include:  number of bathrooms, fireplaces, finished basement; garages and pools.

Site features can also increase or decrease the assessed value of your property such as traffic patterns; being situated on a corner lot; and proximity to such amenities as golf courses, hydro corridor, railway or green space.

How to Determine the Accuracy of Your Assessment

You now have the ability to compare your assessment to similar properties in your area to help you determine its accuracy.  To obtain detailed information about your property and information on up to 24 properties of your choice and up to 6 selected by MPAC, free of charge, visit Visit About My Property at  Enter the personalized user ID and password that was provided to on your assessment notice and follow the instructions.

What is the Last Date to Appeal An Assessment?

If you do not agree with your assessment, a free reconsideration process is available through the Municipal Property Assessment Corporation (MPAC). The deadline for submitting a request for reconsideration is March 31st of the current year. For additional information, please contact the Municipal Property Assessment Corporation at 1-866-296-6722 or fax 1-866-297-6703 or send your written request to The Municipal Property Assessment Corporation. PO Box 9808 Toronto, Ontario M1S 5T9

In addition, you can appeal your assessment by sending a written request to the Assessment Review Board, an independent tribunal at: Assessment Review Board, 655 Bay Street, Suit 1200, Toronto, Ontario M5G-2K4. A fee of $75 for residential/farm or $150 for commercial/industrial properties must accompany your appeal. Cheque or money order is to be made payable to the Ministry of Finance.

The deadline for application is legislated in the Assessment Act as March 31st of the taxation year. For further information, please contact the Assessment Review Board at 416-314-6900 or toll free 1-800-263-3237, or via the Internet at