Assessments
The Municipal Property Assessment Corporation (MPAC) prepares assessments for all properties in Ontario. If the assessment value for your property increases from the previous assessment, this increase is phased-in equally over the next four years. Assessment values are currently based on a January 1, 2016, value. Your assessed property value is multiplied by the applicable tax rate to calculate yearly taxes.
2021 assessment postponed
Ontario’s Ministry of Finance has postponed the province-wide property assessment that was expected to occur in 2021. Property assessment for the 2021, 2022 and 2023 property tax years will continue to be based on January 1, 2016 market values.
Your property assessment remains the same as it was for the 2020 tax year, unless there have been changes to your property, for example:
- A change to your property including an addition, new construction, or renovation
- A structure on your property was assessed for the first time
- A change to your property’s classification
- A property no longer qualifies as farmland, conservation land or managed forests
- All of part of your property no longer qualifies to be tax exempt
Supplementary and omitted assessments
Supplementary and omitted assessments reflect any increase in assessment due to an addition or improvement to a property. In these situations, MPAC will assess any additional value.
If your property is a newly constructed home, it is likely your initial assessment is for the value of the land only. When these situations occur, MPAC will assess any additional value.
When you receive your supplementary or omitted tax bill it will be retroactive to the date you purchased the property. Legislation allows MPAC to add omitted assessments for the current year and the preceding two years.
Section 357 tax applications
Section 357 of the Municipal Act provides municipalities with the authority to cancel, reduce or refund taxes based on specific criteria. Section 357 tax applications are filed to cancel, reduce or refund all or part of taxes levied on land.
If you think you are eligible to apply for a property tax adjustment, please complete the Application for Cancellation/Reduction/Refund of Taxes under Section 357 (pdf) form and send to finance@oakville.ca.
A $20 fee will apply.
Appeals
If you disagree with MPAC’s assessment or classification of your property, please contact MPAC directly at 1-866-296-MPAC (6722) to make a Request for Reconsideration. If you are not satisfied with the outcome of that review, you have the option to file an appeal with the Assessment Review Board.
Businesses can appeal to the Assessment Review Board without making a Request for Reconsideration.
For more information about the appeals process, visit the MPAC website.
For more information, contact:
Municipal Property Assessment Corporation
6745 Century Ave, Suite 1
Mississauga, ON L5N 8C9
1-866-296-6722
enquiry@mpac.ca
Tax forms
Please contact ServiceOakville at 905-845-6601 to ensure that all requirements are met for our various programs prior to downloading and submitting applicable forms.
Notice of Mailing Address Change (pdf)
Pre-authorized Tax Payment Plan Application (pdf)
Pre-authorized Tax Payment Plan Banking Information Change Request Form (pdf)
Pre-authorized Tax Payment Plan Cancellation Request Form (pdf)
Application for Registered Charities Rebate Program (pdf)
Application for Senior's Property Tax Rebate Program (pdf)
Application for Cancellation/Reduction/Refund of Taxes under Section 357 (pdf)