Municipal Assessment vs Sale Price in Montreal: What You Need to Know

Two numbers, two completely different purposes

This is the question that comes up most often when I first meet a seller. "The City assesses my property at $720,000. So I should sell around that price?" The short answer is no, and the gap is entirely normal.

The municipal assessment exists to distribute the tax burden among property owners in a given territory. The sale price is the outcome of a negotiation between a buyer and a seller, on a specific date, in a specific market. Both numbers describe the same property, but they answer different questions.

I have specialized in residential properties in Montreal since 2018, and this confusion is expensive. It pushes some sellers to list too low and leave money on the table. It pushes others to hold on to a price the market will never validate. Here is how to read each number correctly before you put your property on the market.

What does the municipal assessment actually measure?

The municipal assessment is the value entered under your name on the property assessment roll, prepared by the City of Montreal's property assessment department. That roll has one legal function: to serve as the basis for calculating municipal and school taxes. It was never designed to tell you what price to sell at.

The current roll, covering 2026-2027-2028, was filed on September 10, 2025 and has been in force since January 1, 2026, for three fiscal years. Its market reference date is July 1, 2024 (City of Montreal, filing of the 2026-2027-2028 rolls).

That date is the heart of the problem. The value printed on your tax bill in 2026, 2027 and again in 2028 reflects the market as it stood in July 2024. Two years have passed since then, and a real estate market does not stand still for two years.

Mass appraisal, not a visit

The second limitation is the method. Municipal assessors process hundreds of thousands of units. They work from roll data: lot size, living area, year of construction, building type, sector, recent neighborhood transactions. It is mass appraisal, rigorous at the scale of a neighborhood, but blind to detail.

Nobody walked through your home. The roll does not know your kitchen was redone last year, that your basement takes on water, that your triplex carries a right of way, or that your condo faces a brick wall rather than the park. Those are precisely the details that move a sale price by $50,000 or $150,000.

The 2026-2028 roll in numbers

The new roll pushed average building values up 12.2% across the Montreal agglomeration, and 12.6% for the City of Montreal alone. But that average hides significant gaps by building type and by borough.

By borough, the spread is wider still. Anjou posts the largest increase at 22.6%, followed by Rivière-des-Prairies-Pointe-aux-Trembles at 21.3%. At the other end, Ville-Marie stands out at just 5.8%, held back by rising office vacancy. Most other boroughs land between 9% and 20% (City of Montreal, filing of the 2026-2027-2028 rolls, September 2025).

One thing to remember: a higher assessment does not automatically mean a proportionally higher tax bill. Tax rates are adjusted downward when values rise. What drives your bill is how your property moved relative to the average in your borough.

Why the gap with the sale price is structural

Three mechanisms explain why your municipal assessment and your sale price will almost never converge.

1. The time lag. The roll is frozen at July 1, 2024 for three years. The market is not. In August 2026, the median price of a single-family home in the Montreal metropolitan area stood at $650,000, up 3% year over year. The condominium traded at $437,250, up 4%, and the plex at $856,000, up 2% (QPAREB, monthly statistics, August 2026). The market has also rebalanced: 2,853 sales that month, down 13% year over year, against 20,128 active listings, up 18%. All of those movements happened after the roll's reference date. None of them appear in it.
2. Mass appraisal versus a unique property. The roll sets a plausible value for a building type in a sector. A buyer purchases one specific property, with its actual condition, light, orientation, renovations and flaws.
3. The market pays for scarcity, not for averages. On a street where three plexes hit the market at once, the price negotiates downward. On a street where a corner house appears after eighteen months without inventory, several buyers compete for the same property. The roll captures neither situation.

How I establish true market value

The tool that replaces the municipal assessment is the comparative market analysis. It rests on a simple premise: the only valid proof of what a property is worth is what similar properties actually sold for, recently, nearby.

In practice, here is what I look at:

• Closed sales from the last three to six months, within a tight radius. Not asking prices: prices paid. An asking price proves nothing until someone accepts it.
• Comparability adjustments. A comparable property is never identical. I adjust for square footage, number of bedrooms, parking, condition of major components, floor level for a condo, declared income for a plex.
• Average days on market for the sector and the ratio between asking price and selling price. Together they tell you whether the local market leans toward buyers or sellers, neighborhood by neighborhood.
• Active inventory and absorption. How many comparable properties are competing directly with yours right now, and how fast that inventory is clearing.
• Withdrawn and expired listings. Often the most useful signal of all: they show the price at which the market said no.

A municipal assessment does none of this. Nor does it claim to.

Three situations where the assessment genuinely misleads

The renovated property

This is the most common gap. A major interior renovation, kitchen, bathrooms, floors, windows, does not necessarily change the roll value if it did not require a permit affecting floor area or structure. The market pays for it regardless. I have seen gaps of more than 20% between the roll and the price obtained, attributable purely to the quality of the finishes.

The income plex

A plex buyer purchases two things: a building and an income stream. Two neighboring triplexes, identical in size and nearly identical on the roll, can sell $150,000 apart if one is locked into below-market leases and the other is partly vacant at closing. The roll does not see leases.

The condo in a fragile building

For a condominium, the syndicate's financial health carries real weight. An underfunded contingency fund, a reserve study announcing a special assessment, ongoing litigation or a facade due for repair all get negotiated into the sale price. The assessment roll accounts for none of it.

Can I contest my municipal assessment?

Yes, but within a specific window. For the 2026-2027-2028 roll, a request for review had to be filed with the City's property assessment department by April 30, 2026. That date has passed. Owners who did not act will need to wait for the next triennial roll, unless a specific event affects their property.

Those events do exist and reopen a deadline: a change to the roll by assessor's certificate, a change of use, a demolition, an expansion or a new entry. You then receive a notice of alteration, and the contestation period restarts from that notice. The procedure and the prescribed form are detailed on the City of Montreal website.

One important caveat: contesting downward to reduce taxes does nothing positive for your sale price, and an inflated assessment does not help you sell higher. Serious buyers and their brokers work from comparables, not from the roll.

What to keep in mind before setting a price

The municipal assessment remains a useful data point, and I do use it. Not to set a price, but to read a sector.

What the roll tells you well is movement over time. Comparing one year to the next, and even one month to another alongside sales statistics, shows me whether a sector is gaining value, holding flat or slowing down. That is what lets me tell a seller the timing is right to go to market, or that waiting a few weeks is the better call. That reading of the sector is reliable.

There are also sector statistics showing the average gap between the roll and actual sale prices. They are worth a look, but I never build a price on them. Too many property-specific factors move that number: condition, renovations, an easement, a weak contingency fund, the view. A sector average says nothing about your particular home.

So you will never see me post a sold property with the line "X per cent above municipal assessment". That kind of figure impresses, but it proves nothing about the house next door.

What the municipal assessment does not do is set a sale price.

If you are preparing a transaction, remember three things. The roll in force describes the market of July 2024. It was produced without anyone visiting your property. And it completely ignores what separates two neighboring properties: condition, income, view, syndicate, timing.

A poorly calibrated starting price costs far more than people expect. Too high, the property stalls, accumulates days on market and eventually sells below its real value after reductions. Too low, you leave money on the table in the first week. Getting that price right, with the numbers to back it, is exactly a broker's job when you prepare to sell.

Wondering what your property is genuinely worth today, outside the assessment roll? Get in touch and I will prepare a comparative analysis for your address.