How Ontario Property Tax Is Actually Assessed: MPAC, the 2016 Freeze, and Your Tax Bill
Why your assessed value is stuck on a 2016 base year — and what a future reassessment could mean
How is property tax assessed and calculated in Ontario?
Your property tax equals your home’s assessed value multiplied by your municipality’s combined municipal and education tax rate. According to MPAC (mpac.ca), the assessment itself is done by an independent body called MPAC (the Municipal Property Assessment Corporation), using a method called Current Value Assessment that looks at comparable sales in your area. The catch: Ontario has not run a province-wide reassessment since 2016, so your 2026 tax bill is still based on a valuation date of January 1, 2016 (According to MPAC).
Source: Municipal Property Assessment Corporation (mpac.ca, Assessment Cycle / Property Assessment and Property Taxes); Ontario Assessment Act, regulation filed August 16, 2023 extending the reassessment postponement.
Most owners look at their tax bill and have no idea where the number comes from — or why a near-identical house down the street pays something different. Here’s how Ontario property tax actually works: who does the assessing, which year’s value they use, how the assessed number differs from what you’d really sell for, and what happens to your bill the day reassessment finally returns.
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Who assesses: MPAC, not your city hall
What gets valued: Current Value Assessment
The fact most owners miss: values are still frozen at 2016
ℹ️The 2016 freeze has a side effect: homes whose value ran ahead since 2016 (many renovated houses and detached homes in hot pockets) are currently taxed relatively lightly. When reassessment resumes, those are the properties with the most room to adjust upward. If you’re buying that kind of home to hold long-term, leave some budget headroom for future property tax.
Assessed value is not market value
⚠️Don’t use the assessed value on your tax bill to estimate your sale price, and don’t let a buyer use it to argue you down. It’s a 2016-based standardized figure on a different track from today’s sale prices. Price off recent comparable sales, always.
How the bill is calculated: value x rate
Why a higher assessment doesn’t always mean a higher tax: revenue-neutral
A common fear: ‘when reassessment returns and my value jumps, won’t my tax explode?’ Here’s the mechanism people overlook. According to MPAC, a province-wide increase in assessed values is revenue-neutral — it doesn’t change the total tax a municipality collects. Instead it redistributes the tax burden within that municipality. Picture the municipality’s total budget as a fixed pie that has to be divided among all property owners; reassessment doesn’t make the pie bigger, it just re-slices it based on updated relative values. If your home rose faster than the local average, your slice gets larger and your tax may rise; if it rose slower than average, your slice shrinks and your tax may actually fall. So the question that matters isn’t ‘did my value go up’ — almost everyone’s did since 2016 — it’s ‘did it go up faster or slower than the rest of my municipality.’ That reframing is what lets you estimate, roughly, which direction your own bill would move.
💡 Three things to remember: MPAC sets the value, frozen on a 2016 base; tax = assessed value x (municipal + education rate); assessed value is not your market value. When reassessment finally returns, what moves your bill is whether your property rose faster or slower than your municipality’s average. Until then, treat the assessed value as a tax input only, and watch your municipality’s rate decisions for the real year-to-year movement in what you owe.
Frequently Asked Questions
Who decides the assessed value of a property in Ontario?
An independent body called MPAC (the Municipal Property Assessment Corporation). According to MPAC, it uses Current Value Assessment, based on comparable sales, to value every property in the province, then provides that value to municipalities for tax calculation.
Why is my MPAC assessed value so much lower than market value?
Because the assessment is still based on a 2016 valuation date. According to MPAC, Ontario hasn’t run a province-wide reassessment since 2016, and the 2026 tax bill still uses the January 1, 2016 value, while GTA prices have changed a lot since then.
How is property tax calculated in Ontario?
According to MPAC, property tax equals your assessed value multiplied by your municipality’s combined municipal and education tax rate. The municipality sets its rate each year based on its budget, and rates vary by property class.
If reassessment returns, will my property tax spike?
Not necessarily. According to MPAC, a province-wide assessment increase is revenue-neutral and only redistributes the tax burden within a municipality. If your home rose faster than the local average your tax may rise; if slower, it may fall.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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