Every year, Canadian homeowners receive property tax assessment notices and most of them have no idea whether the number is accurate, whether they are overpaying, or what to do about it. Most realtors treat this as someone else is problem, a matter for the assessment authority and the homeowner to sort out without any guidance from the agent who knows the local market better than anyone.
That is a missed opportunity. Understanding property tax assessments well enough to guide your clients through the basics is one of the practical, non-transactional services that builds lasting client relationships and generates referrals from people who feel genuinely well-served rather than simply sold to.
How Property Tax Assessments Work in Canada
Property tax in Canada is administered at the municipal and provincial level, which means the rules vary significantly depending on where your clients are located. In Ontario, the Municipal Property Assessment Corporation, known as MPAC, is responsible for assessing the value of all properties in the province. MPAC assessments are supposed to reflect the current value of a property, updated on a cycle that has been paused in recent years due to market volatility. Similar bodies exist in other provinces under different names and with different assessment cycles.
The assessed value of a property is not the same as its market value and it is not the same as what you would use in a CMA. It is a standardized estimate produced by a government body using a combination of mass appraisal methodology and comparable sales data from a specific reference date. In many markets, particularly those that experienced significant price appreciation in recent years, the assessed value and the actual market value can differ substantially in either direction.
When an Assessment Might Be Wrong
Assessments can be inaccurate for several reasons. The assessment authority may have incorrect information about the property, such as an outdated square footage, a bedroom count that does not reflect the actual layout, or a lot size that was recorded incorrectly at some point. The comparable sales used in the mass appraisal may not reflect the specific characteristics of the property, particularly for unusual homes, properties with significant deferred maintenance, or properties on streets with highly variable values.
As a realtor, you are uniquely positioned to identify potential inaccuracies because you have access to current comparable sales data and you can evaluate the property on the ground. If a client mentions their assessment seems high and you pull comparable sales that suggest their property is valued above what similar homes are transacting for, that is worth flagging to them along with the information about how to appeal.
The Appeal Process: A General Overview
Every province has a process for homeowners to dispute their property tax assessment, and the deadline for filing an appeal is typically fixed and non-negotiable. In Ontario, homeowners can file a Request for Reconsideration with MPAC within a specified window after receiving their assessment notice. If the reconsideration does not produce a satisfactory result, there is a further appeal available through the Assessment Review Board.
Your role is not to manage this process for your clients or to provide advice that constitutes legal or financial counsel. Your role is to alert clients who may have grounds for appeal, refer them to a property tax consultant or real estate lawyer who handles assessments, and provide any market data from your MLS access that might support their case. Property tax consultants in Canada typically work on a contingency basis, meaning they only charge a fee if the appeal is successful and results in a reduced assessment, which makes the process low-risk for homeowners to pursue.
Why This Matters for Your Long-Term Client Relationships
Most real estate agents disappear after closing. They send a housewarming gift and a holiday card and that is the extent of the ongoing relationship. The agents who build genuinely loyal client bases do something different: they remain useful after the transaction in ways that have nothing to do with getting the next listing.
A phone call to a past client in the year their assessment comes up, mentioning that you have been watching the market in their area and that their assessment might be worth reviewing, is the kind of proactive service that clients talk about. It demonstrates that you understand the local market, that you are still thinking about their financial wellbeing, and that your relationship with them is not purely transactional. That is the foundation of referral business that sustains a career for decades.
