It's one of the most common points of confusion in real estate, for buyers and sellers alike. Someone looks up the municipal assessment of a property, assumes it reflects the real value, and uses it to negotiate, set a listing price, or judge whether a home is well-positioned on the market.
The shortcut is understandable. But it can lead to poorly informed decisions — in both directions.
In this article, we explain how municipal assessments actually work in Quebec, why they vary so much from one municipality to the next, and what we actually rely on to establish the market value of a property.
How Municipal Assessment Works in Quebec
Its Primary Purpose: Taxation, Not Sales
Municipal property assessment exists first and foremost to establish the basis for calculating property taxes. It's by multiplying the value on the assessment roll by the municipal tax rate that each property owner's annual contribution to their municipality is determined. It is a fiscal tool, not a sales tool.
A Three-Year Roll With a Fixed Reference Date
In Quebec, the property assessment roll is produced every three years by the municipal organization responsible for assessment, generally the RCM or the city. Once filed, it remains in effect for three consecutive fiscal years.
What is less well known: the value on the roll does not correspond to the date it was filed. It reflects the real estate market as it existed on July 1st of the year preceding the filing. In other words, a roll filed in September 2024 for the years 2025-2026-2027 reflects market values as of July 1, 2023. From the moment it takes effect, it is already 18 months behind the real market. And that gap widens throughout the three years the roll is in effect.
In a sustained growth market, such as the one the Outaouais experienced between 2020 and 2025, this creates considerable gaps between the municipal assessment and the prices at which properties actually sell.
Mass Appraisal, by Neighbourhood
The other fundamental thing to understand: the municipal assessor does not visit each property individually to determine its value. They use mass appraisal, grouping properties by neighbourhood units with similar characteristics and assigning values based on sales data in that area.
This approach is efficient for processing a territory with thousands of files. But it means the value on the roll does not necessarily account for the specific features of your property: major undeclared renovations, an exceptional lot, a view, or an overall condition significantly above or below the neighbourhood average.
Why the Gap Varies So Much From One Municipality to the Next
This phenomenon is one of the least understood, and it explains why comparing municipal assessments across different cities without context can be misleading.
The Median Ratio: The Official Measure of the Gap
The Quebec government tracks a precise annual indicator to measure this gap: the median ratio of the assessment roll. It compares the actual sale prices of properties transacted on a given territory to the values on their assessment roll. If a municipality's median ratio is 85%, it means properties are selling on average 15% above their municipal assessment. A ratio of 110% means the opposite — sales are closing below the assessment.
The target is 100%, meaning an assessment in perfect alignment with the market. In practice, that perfect alignment is rare, and it varies significantly from one municipality to the next.
Very Different Realities Depending on the Area
In urban areas where transaction volume is high and the market is well documented, assessors have access to many recent comparables, which allows for more precise adjustments. Median ratios tend to be closer to 100%, even if market cycles always create some lag.
In rural or semi-rural municipalities, the reality is often different. Annual transaction numbers can be very low — sometimes only a handful of sales across an entire municipality. The assessor therefore has less data to work with. In a context where cottages, waterfront properties, and wooded lots saw their values surge after 2020, the municipal assessment may lag significantly behind the real market value.
Conversely, a property in a sector where demand has softened or where specific issues affect values — limited access, aging infrastructure, restrictive zoning — could see its municipal assessment exceed its current market value.
The Comparative Factor: A Tool to Correct the Gap
To account for these discrepancies between the rolls and the real market, the Quebec government publishes an annual comparative factor for each municipality. This factor is used to bring municipal assessments onto a uniform basis, particularly for calculating school taxes, inter-municipal contributions, and land transfer taxes (the welcome tax).
For example: if a municipality has a comparative factor of 1.15, it means the real value of properties is estimated at 15% more than what is on the roll. This factor is publicly available and useful for understanding the general gap, but it does not replace a rigorous analysis of comparables when establishing the price of a specific property.
Why Municipal Assessment Is Not a Reliable Pricing Guide
Now that the mechanism is clear, here is what we observe on the ground — and why relying on it carries real risks.
The Classic: "Listed Below Assessment"
It is not uncommon to see real estate listings mention that the asking price is below the municipal assessment, as a way of signalling a "good deal."
But if the assessment is two years old and the market has slowed significantly since, selling below assessment may mean selling above the real market value. The argument only holds if you understand exactly which date the assessment reflects and what has happened in the market since.
Likewise, a buyer submitting a low offer based on an outdated assessment from a period of rising prices risks being turned down without even entering negotiation.
What the Assessment Doesn't See
The municipal assessment is built on general criteria: lot size, living area, year of construction, building type, and neighbourhood. It does not account for:
Undeclared renovations. A fully renovated kitchen, a new bathroom, a repaired foundation, a new roof — these improvements increase market value but may not be reflected in the assessment if no assessor visit has taken place since the work was done.
The actual condition of the property. A well-maintained home is worth more than an identical one on paper that has been neglected. Block appraisal does not capture this nuance.
Unique characteristics. A waterfront view, a large wooded lot, an exceptional location in a sought-after area — or conversely, a restrictive easement, a problematic neighbourhood, or difficult winter access. These elements have a direct impact on market value, but not necessarily on the property tax assessment.
Current market dynamics. Supply and demand, the number of active buyers in a sector, the scarcity of a particular property type — all of these factors are absent from the municipal calculation.
What We Actually Use to Establish Market Value
Market value is the most probable price a serious and informed buyer is willing to pay for a given property, under current market conditions. It is not a fixed figure. It shifts with interest rates, available inventory, buyer confidence, and seasonal trends.
To establish it rigorously, we rely on three types of information.
Recent Comparable Sales ("Comparables")
This is the foundation of any serious analysis. We identify similar properties — same area, same type, comparable size and features — that have sold within the past six months. We look at the final sale price, not the asking price, and adjust for differences between those properties and the one being evaluated.
This data is not publicly available. It comes from the Centris database, accessible only to real estate brokers who are members of the QPAREB. This is one of the core reasons why working with a broker gives you access to information you simply cannot obtain on your own.
Expired and Withdrawn Listings
A property that spent several months on the market without finding a buyer, or whose listing expired, provides valuable information — even if the reasons can vary. In some cases, the asking price exceeded what the market was prepared to pay. In others, it was the nature of the property itself that complicated the transaction: a very particular product with a limited pool of buyers, structural issues, restrictive access or zoning, or a timeline extended by external circumstances. Analyzing this data in context helps define what the market accepts, what it doesn't, and why.
Active Listings
These define the direct competition at the time of listing. If several similar properties are already available, that influences the pricing strategy. Conversely, if supply is nearly non-existent in a given area, a more aggressive positioning may be justified.
Know the Real Value Before You Decide
Whether you are thinking about buying or selling, understanding the real market makes all the difference. A property listed at 120% of its municipal assessment may be perfectly well-positioned. Another listed at 95% of its assessment may be overpriced. It all depends on the market at the time of the transaction.
Gabriel works with real Outaouais market data to help clients make informed decisions, in both urban and rural areas. A comparative market analysis (CMA) gives you a clear, documented picture of a property's value — based on what has actually sold, what hasn't, and what is currently available.
Reach out to discuss your project.
gabrielbelisledupuis.com | info@gabrielbelisledupuis.com | 819-328-7173
Sources: Government of Quebec (Ministère des Affaires municipales et de l'Habitation), Act Respecting Municipal Taxation, MRC de Pontiac, Association des évaluateurs municipaux du Québec (AEMQ).