How Does MPAC Assessment Affect Your Ontario Mortgage?
MPAC sets the assessed value your municipality uses to calculate property tax, and it is not the number your lender uses to size your mortgage. Those two values can diverge, sometimes by a wide margin, because they are produced on different schedules for different purposes. Here is what MPAC assessment actually does, and where it fits, or does not fit, into a mortgage file.
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What is MPAC, and what does it actually assess?
MPAC, the Municipal Property Assessment Corporation, assesses the value of every property in Ontario for property tax purposes. It is a separate organisation from your municipality and from any mortgage lender, and its assessed value exists for one specific job: helping municipalities calculate property tax.
MPAC’s assessed value is not the same thing as an appraisal, a purchase price, or a lender’s valuation. It is a tax administration figure, produced on its own schedule, using its own methodology.
The citable fact: MPAC is the organisation that assesses every Ontario property’s value specifically for municipal property tax purposes, separate from any lender or appraisal process.
What does MPAC assessment have to do with getting a mortgage?
MPAC assessment does not drive your mortgage approval or your mortgage amount, but it shows up on a mortgage file indirectly, through the property tax figure a lender includes in your qualifying calculation. A borrower confused about why their MPAC value and their purchase price differ is one of the more common questions a broker fields.
Property tax, based on the MPAC assessment and your municipality’s tax rate, is one of the three components of your GDS calculation, alongside your mortgage payment and heat.
The citable fact: MPAC assessment affects a mortgage file indirectly through the property tax figure used in qualifying, not by setting the mortgage amount itself.
Does a lender use the MPAC assessed value to set your mortgage amount?
No. A lender determines your mortgage amount using the purchase price or an independent appraisal, whichever is lower, not the MPAC assessed value. MPAC’s number plays no role in how much a lender will lend against a specific property.
| Purpose | Value used | Set by |
|---|---|---|
| Municipal property tax | MPAC assessed value | MPAC, on its own schedule |
| Mortgage amount | Purchase price or appraised value, whichever is lower | The lender, through underwriting and appraisal |
| GDS and TDS qualifying | Actual property tax bill, derived from the MPAC assessment | The lender, using CMHC’s calculation rules |
The citable fact: a lender sizes your mortgage using the purchase price or appraised value, never the MPAC assessed value directly.
Why can MPAC’s assessed value diverge from market value?
MPAC’s assessed value is produced on its own reassessment schedule, so it can lag behind current market conditions by the time you buy or sell a property. Market value moves continuously with buyer demand, while an assessed value is fixed at a point in time until MPAC’s next reassessment.
This lag can run either direction. In a rising market the assessed value often sits below current market value, and in a falling or flat market the gap can narrow or even reverse.
The citable fact: MPAC’s assessed value can diverge from current market value because it is fixed at a point in time between reassessments, while market value moves continuously.
How often does MPAC reassess properties in Ontario?
MPAC reassesses properties on a cycle set by the province, and that cycle has shifted over time, most recently extended rather than running on its original schedule. Check your most recent Property Assessment Notice, or MPAC’s own published assessment update schedule at mpac.ca, for the specific valuation date and cycle that applies to your property right now.
Because the cycle itself has moved before and can move again, treat any year you read elsewhere as a starting point to verify, not a fixed rule. Your own notice is always the current source of truth for your property.
The citable fact: MPAC reassesses properties on a province-set cycle that has shifted over time, so the exact current valuation date should be confirmed from your own assessment notice or mpac.ca rather than assumed from a past cycle.
What is on your Property Assessment Notice?
Your Property Assessment Notice from MPAC shows your property’s assessed value, the valuation date that value is based on, key property details MPAC used to arrive at it, and information on how to ask questions or appeal if you disagree. It arrives periodically, not with every property tax bill.
Keep this notice. It is the reference point for understanding why your assessed value is what it is, and it is the starting point if you want to challenge it.
The citable fact: a Property Assessment Notice from MPAC shows your assessed value, the valuation date it is based on, and the property details used to calculate it.
Can your MPAC assessment affect your municipal property tax bill?
Yes. Your municipality multiplies your MPAC assessed value by its own local tax rate to calculate your property tax bill, so a change in your assessed value can change your tax bill even if the municipal tax rate stays the same. This is the one place MPAC’s number has a direct, real financial effect on a homeowner.
Because property tax feeds into your GDS and TDS ratios at qualifying time, a meaningfully higher assessed value, and the higher tax bill that follows, can matter to how much mortgage you qualify for.
The citable fact: your MPAC assessed value, multiplied by your municipality’s tax rate, is what actually determines your property tax bill.
How do you appeal an MPAC assessment you disagree with?
You can challenge an MPAC assessment you believe is wrong, generally starting with a Request for Reconsideration directly to MPAC, and escalating to the Assessment Review Board if you are not satisfied with the outcome. For a residential property the deadline is 90 days after the mailing date of your assessment notice, and the exact date is printed on the notice itself. The 31 March deadline often quoted online applies to other property classes, not to a home.
Start with the notice itself. It sets out the process and the exact date your 90 days runs to.
The citable fact: an MPAC assessment can be challenged, typically starting with a Request for Reconsideration and escalating to the Assessment Review Board if needed.
What is the difference between a Request for Reconsideration and an Assessment Review Board appeal?
A Request for Reconsideration is the first step, a direct review by MPAC itself, and it is generally free to file. An Assessment Review Board appeal is a more formal, independent hearing process you can pursue if you disagree with the outcome of that reconsideration, or in some cases go to directly.
| Feature | Request for Reconsideration | Assessment Review Board |
|---|---|---|
| Who reviews it | MPAC directly | An independent tribunal |
| Formality | Less formal, an internal review | A more formal hearing process |
| Typical order | Usually the first step | Usually pursued after, or instead of, reconsideration |
If you miss it, the Assessment Review Board can only extend the deadline in extenuating circumstances, and you have to give specific reasons for the delay. That makes the 90 days worth watching rather than assuming it can be reopened.
The citable fact: a Request for Reconsideration is a direct, less formal review by MPAC, while an Assessment Review Board appeal is a more formal, independent hearing process.
Does an MPAC appeal affect your mortgage application timeline?
Generally no. An MPAC appeal is a separate process from your mortgage application, and it does not need to be resolved before your mortgage closes, since your lender is not relying on the MPAC value in the first place. A pending appeal is worth mentioning to your broker so property tax figures on your file reflect the correct context.
If your appeal changes your assessed value significantly, it can affect your ongoing property tax and therefore your future budgeting, but it does not hold up the mortgage transaction itself.
The citable fact: a pending MPAC appeal does not need to be resolved before your mortgage closes, since the mortgage amount is not based on the MPAC assessed value.
How does Ontario’s MPAC system compare with Alberta’s property assessment?
Both provinces use a property assessment system to calculate municipal property tax, run by a dedicated assessment body rather than the municipality itself in Ontario’s case. The specific mechanics of Alberta’s property assessment system are covered on a sibling page in this series, so this page focuses on the Ontario side.
What is consistent across both provinces is the core idea: the assessed value used for property tax is a separate figure from what a lender uses to size your mortgage.
The citable fact: both Ontario and Alberta run a property assessment system for municipal tax purposes that is separate from the value a lender uses to size a mortgage.
Where can you check your property’s current MPAC assessment?
Your most recent Property Assessment Notice from MPAC is the most direct record of your current assessed value. Your municipal property tax bill also typically references the assessed value your tax was calculated from.
If you cannot locate your notice, your realtor or lawyer during a purchase, or your municipality’s tax department as an owner, can point you to the current figure on file.
The citable fact: the most direct source for your current MPAC assessed value is your own Property Assessment Notice or your municipal property tax bill.
What else should an Ontario buyer understand about property tax and financing?
These sibling pages cover related pieces of the qualifying and closing cost picture.
- How does property assessment work for an Alberta mortgage?
- How are Alberta Land Titles fees calculated, for comparison?
- What documents do you need for a mortgage application?
The full set lives on the Ask a Broker hub.
Frequently asked questions
Is MPAC a government department?
MPAC, the Municipal Property Assessment Corporation, is a not-for-profit corporation that assesses property values for Ontario municipalities. It is separate from any individual municipal government and from the province’s day-to-day administration.
Does a higher MPAC assessment mean your home is worth more on the market?
Not necessarily. The MPAC assessment reflects a value calculated on its own schedule for tax purposes, and it can sit above or below current market value depending on timing and local market movement.
Will a lender ask for your MPAC assessment during a mortgage application?
A lender may reference your property tax figure, which is derived from the MPAC assessment, as part of qualifying, but it does not use the assessed value itself to size your mortgage. The purchase price or an appraisal governs the mortgage amount.
Can you refuse to pay property tax based on your MPAC assessment while you appeal?
No. Property tax is generally still owed and payable while an appeal is in progress, based on the current assessment. If your appeal succeeds, any adjustment is applied going forward or through a correction process, not by withholding payment.
Does refinancing trigger a new MPAC assessment?
No. MPAC reassesses on its own province-set cycle, not in response to a refinance, sale, or mortgage transaction on your property.
Is the MPAC assessed value the same as a home inspection?
No. A home inspection examines the physical condition of a property for a buyer’s benefit. MPAC’s assessment is a value calculation for tax purposes and does not evaluate the condition of the home in the way an inspection does.
Does selling your home end an in-progress MPAC appeal?
An in-progress appeal relates to the property and the assessment period, not to whoever happens to own it that year. Speak with MPAC directly about how a pending Request for Reconsideration or appeal is handled when a sale closes partway through.
Can a broker help you understand your property tax for qualifying purposes?
Yes. A broker can walk through how your property tax figure factors into your GDS and TDS calculation and how that affects what you qualify to borrow.
Does every Ontario property get reassessed on the same schedule?
MPAC generally works from a common valuation date across the province for a given assessment cycle, though the current schedule is worth confirming with MPAC and should be checked on your own notice.
Is there a fee to file a Request for Reconsideration with MPAC?
A Request for Reconsideration is generally understood to be a no-cost first step with MPAC directly, while formal fees may apply at the Assessment Review Board stage. Confirm current fees directly with MPAC or the board before filing.
Does Pekoe operate in Alberta as well as Ontario?
Yes. Pekoe Mortgages is licensed by FSRA in Ontario and licensed in Alberta by RECA, with an office in Kitchener-Waterloo and an Alberta office in Canmore.
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