MPAC Assessed Value vs Market Value in Ontario
Your MPAC assessed value is the value the Municipal Property Assessment Corporation assigns to your home for property-tax purposes — and it is not the same as market value, which is what your home would actually sell for today. The two often differ by a wide margin, especially now, because Ontario’s assessments are still based on a January 1, 2016 valuation date. If you’re pricing your home to sell, the MPAC number is one of the least reliable figures you could use. Here’s why they differ and what to rely on instead.
What is MPAC and the assessed value?
The Municipal Property Assessment Corporation (MPAC) is the independent body that assesses the value of every property in Ontario for property-tax purposes. Your municipality uses MPAC’s assessed value to apportion property taxes among homeowners — it’s a tax tool, not a selling tool.
Crucially, MPAC uses mass appraisal: it values properties in bulk using models and property characteristics as of a set valuation date, rather than individually inspecting and pricing each home for today’s market. That approach is efficient and fair for distributing taxes, but it produces a number that can be quite different from what your specific home would fetch on the open market right now.
What is market value?
Market value is what a willing buyer will actually pay a willing seller in the open market today — the real selling price, set by current supply, demand, competition, condition, and buyer emotion. It changes with the market and reflects your home’s specific features and today’s conditions, unlike a mass-appraised, date-frozen assessment. Local demand tracked by the Ottawa Real Estate Board and national context from the Canadian Real Estate Association shape it.
Market value is what matters when you sell, and it’s discovered by exposing the home to the market, informed beforehand by a comparative market analysis. It’s a live number; the MPAC assessment is a historical one.
Why they’re different
Three fundamental differences drive the gap. Purpose: MPAC values are for taxation; market value is for selling. Method: MPAC uses mass appraisal across many properties; market value reflects your individual home and real buyer demand. Timing: MPAC assessments are tied to a past valuation date, while market value is current. Because of this, the two numbers are measuring different things for different reasons — so it’s normal for them to diverge, sometimes dramatically.
An assessed value can be well below market value (common, given the dated valuation) or occasionally above it for a particular property. Either way, the assessment tells you how your taxes are apportioned, not what your home is worth to a buyer. Think of them as two separate scorecards kept for two separate games: one decides your share of the municipal tax bill, the other decides what you’ll actually receive at closing. Confusing the two is where sellers go wrong.
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The valuation-date lag
This is the big one right now. Ontario’s property assessments are still based on a January 1, 2016 valuation date — the province’s scheduled reassessments have been repeatedly postponed, so current assessment notices continue to reflect 2016 values rather than today’s. Given how much Ottawa home values have changed since 2016, the gap between a home’s assessed value and its current market value is often very large.
That means using your MPAC assessment to gauge today’s market value is especially misleading at the moment. Confirm the current assessment cycle status directly with MPAC and the Government of Ontario, since the reassessment timeline can change — but as things stand, the assessed value reflects a market that’s years out of date.
Assessment vs your property taxes
It helps to understand how the assessment is actually used. Your municipality — for most readers, the City of Ottawa — sets a tax rate and applies it to your assessed value to determine your property-tax bill. Because assessments are frozen at 2016 values province-wide, the relative assessments among homes are what apportion taxes, not the absolute dollar figure versus today’s prices.
So a rising market doesn’t automatically raise your assessment (it’s frozen), and your assessed value climbing or falling in a future reassessment doesn’t necessarily mean your taxes rise or fall by the same amount — it depends on how your home’s assessment changes relative to others. The assessment is a tax-apportionment number, full stop.
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Why you shouldn’t price off your MPAC value
Given all of the above, pricing your home based on its MPAC assessment is a mistake in both directions. If your assessed value is well below market — likely, given the 2016 date — pricing to it would leave serious money on the table. If it happened to be above market for your property, pricing to it would overprice the home and cause it to sit. Either way, the assessment simply isn’t designed to tell you what buyers will pay today.
Buyers occasionally raise the MPAC number in negotiations (“but it’s only assessed at X”), so as a seller it helps to understand why that figure is irrelevant to current value — it’s a dated, tax-purpose, mass-appraised number, not a market appraisal. The risk of pricing on the wrong number is covered further in the guidance on why overpricing costs you.
Can you appeal your MPAC assessment?
Yes — if you believe your assessed value is inaccurate relative to comparable properties, MPAC has a process to review it, typically starting with a Request for Reconsideration and, if needed, an appeal to the Assessment Review Board. The details and deadlines are on the MPAC site, and it’s worth understanding that the goal of an appeal is fairness relative to similar homes, not aligning your assessment with today’s market value.
For a seller, an appeal is usually beside the point — you’re about to sell, and the assessment doesn’t set your sale price. Appeals matter more to long-term owners concerned that their taxes are unfairly high relative to neighbours. If you’re selling, the energy is better spent on a current market analysis than on the assessment. Still, it’s useful to know the mechanism exists, because buyers sometimes ask about it.
How the MPAC gap plays out in a sale
In practice, the assessment surfaces in a couple of ways during a sale, and it helps to be ready. A buyer or their agent may point to a low assessed value to argue the home is overpriced — the answer is that the assessment is a dated, tax-purpose figure, and recent comparable sales, not MPAC, set the current value. Occasionally a buyer worries a purchase well above the assessment means their taxes will jump; in a frozen-assessment environment, buying above the assessed value doesn’t automatically trigger a reassessment of that home to the sale price.
Being able to explain the assessment calmly and accurately keeps it from becoming a negotiating wedge. It’s one more reason to price on real market evidence and let the comparable sales — not a 2016-based number — carry the conversation about value.
What to use instead
To price your home, use current market evidence, not the assessment. A comparative market analysis (CMA) built from recent comparable Ottawa sales is the right tool — it reflects today’s market and your specific home. For a lender-grade valuation, a formal appraisal serves that purpose, and the difference between an appraisal and market value is its own topic. Both are grounded in current data; the MPAC assessment is not.
General guidance on home values from CMHC reinforces relying on current market evidence, and a registered agent prepares your CMA within the professional standards set by the Real Estate Council of Ontario. The bottom line: for taxes, MPAC; for selling, a CMA.
Jason Polonski is a full-time Ottawa REALTOR® with Right at Home Realty who prices homes on current market evidence — not a dated tax assessment — seven days a week across Kanata, Stittsville, Barrhaven, Manotick, and the wider west end. His Bachelor of Commerce from Concordia University, a double major in Marketing and Finance, is the background that makes the distinction between assessed value, appraised value, and market value clear and practical, so his sellers price to what buyers will actually pay.
Working within the professional standards set by the Real Estate Council of Ontario and drawing on work with hundreds of Ottawa buyers and sellers, Jason makes sure the number you list at is the right one — and can explain to any buyer why the MPAC figure isn’t it. If you want to know what your home is truly worth today, a current market analysis is the place to start.
MPAC Assessed Value vs Market Value (FAQs)
No. The MPAC assessed value is a mass-appraised figure for property-tax purposes, tied to a past valuation date. Market value is what your home would sell for today. They often differ by a wide margin and shouldn’t be used interchangeably.
Ontario assessments are still based on a January 1, 2016 valuation date — reassessments have been postponed — and MPAC uses bulk mass appraisal rather than pricing your specific home for today’s market. Both factors create a large gap with the current value.
No. It’s likely well below current market value given the 2016 date, so pricing to it would leave money on the table; if it were above market, it would overprice the home. Use a current comparative market analysis instead.
It’s used by your municipality to apportion property taxes among homeowners — the municipal tax rate is applied to your assessed value to set your tax bill. It’s a taxation tool, not a measure of what your home would sell for.
Not for pricing. The MPAC figure is a dated, tax-purpose, mass-appraised number, not a market appraisal, so it doesn’t reflect current value. Recent comparable sales, not the assessment, determine what your home is worth today.
A comparative market analysis based on recent comparable Ottawa sales, which reflects today’s market and your specific home. For a lender-grade figure, a formal appraisal serves that purpose. Both use current data, unlike the frozen MPAC assessment.
