How to Appeal Your Calgary Property Tax Assessment?

If your Calgary property tax assessment seems too high, you have the right to appeal it through the City of Calgary’s formal review and appeal process. The assessment appeal deadline in Calgary is March 31 each year for properties assessed in the current tax year. A successful appeal can reduce your assessed value, which directly lowers the property tax you owe for that year and potentially for future years as well. 

This guide explains exactly how the Calgary property tax assessment appeal process works, what grounds justify an appeal, and the steps you need to follow to submit a complaint and pursue a hearing if necessary.

What Is a Calgary Property Tax Assessment?

The City of Calgary assesses the market value of every property annually as of July 1 of the prior year. This assessed value is the basis on which your annual property tax bill is calculated. The City multiplies your assessed value by the applicable tax rate for your property class to arrive at your total property tax owing for the year.

Assessment notices are mailed to Calgary property owners in January each year. The notice shows your property’s assessed value, its property class, and comparison information showing how similar properties in your area were assessed. For a complete breakdown of how Calgary determines property tax amounts, how assessments are conducted, and how to look up your current assessment details, our guide on property tax lookup Calgary covers the full framework that this appeal process operates within.

If you believe your assessed value does not accurately reflect your property’s actual market value as of July 1 of the prior year, you have the right to formally challenge it.

Grounds for Appealing a Calgary Property Tax Assessment

Not every disagreement with your assessed value qualifies as valid grounds for an appeal. The Calgary Assessment Review Board evaluates complaints based on specific legal grounds established under the Municipal Government Act.

Valid grounds for a Calgary property tax assessment appeal include an error in the assessed value relative to the property’s actual market value as of July 1 of the prior year, an incorrect property classification that results in a higher tax rate being applied, a factual error in the property’s physical description such as incorrect square footage, lot size, or number of bedrooms, and an error in the assessed value compared to similar properties in the same neighbour-hood that were assessed more favorably.

Personal financial hardship, disagreement with tax rates, or a general feeling that taxes are too high are not valid grounds for an assessment appeal. The appeal process addresses the accuracy of the assessed value only, not the tax rate or overall tax burden.

How to Appeal Your Calgary Property Tax Assessment: Step by Step

Each step in the appeal process must be followed in the correct sequence and within the required deadlines for your complaint to be considered.

Step 1: Review Your Assessment Notice Carefully

The first step is to read your assessment notice in detail and compare your assessed value against recent sale prices of similar properties in your neighbourhood. The City of Calgary provides online tools that allow property owners to view comparable assessments in their area. If your assessed value is significantly higher than what comparable properties sold for around July 1 of the prior year, you have a potential basis for an appeal.

You can also contact the City of Calgary’s Assessment department directly to request an explanation of how your assessment was calculated. This Customer Service Request process is informal and free, and it sometimes results in a correction without the need for a formal complaint.

Step 2: File a Formal Complaint with the Calgary Assessment Review Board

If the informal review does not resolve your concern, the next step is to file a formal complaint with the Calgary Assessment Review Board. The filing deadline is March 31 each year. Missing this deadline means you cannot appeal your assessment for that tax year regardless of how strong your case may be.

Complaints are filed online through the Calgary Assessment Review Board’s portal. The complaint filing fee is $30 for a residential property with fewer than seven units and $650 for non-residential and multi-residential properties with seven or more units. The residential fee is refunded if your appeal is successful.

When filing your complaint, you must specify the grounds for your appeal and the assessed value you believe is correct. Vague complaints that simply state the value is too high without specific grounds or a proposed value are less likely to succeed.

Step 3: Prepare Your Evidence

After your complaint is accepted, you will have the opportunity to present evidence supporting your proposed assessed value at a hearing. The strength of your evidence is what determines the outcome of your appeal.

Useful evidence for a Calgary property tax assessment appeal includes recent sale prices of comparable properties in your neighbourhood, a professional appraisal of your property’s market value as of July 1 of the prior year, documentation of any physical defects or conditions that reduce your property’s value, and evidence of assessment errors such as incorrect property dimensions or features listed in the City’s records.

Step 4: Attend the Assessment Review Board Hearing

The Calgary Assessment Review Board schedules hearings typically between April and September following the complaint deadline. Most residential property hearings are conducted by a Composite Assessment Review Board panel, which consists of one or three members depending on the complexity of the case.

At the hearing, both the property owner and the City’s assessment team present their evidence and arguments. The Board reviews the evidence and issues a written decision. If the Board agrees with your position, your assessed value is reduced and your property tax is recalculated accordingly.

Step 5: Further Appeal to the Municipal Government Board

If you are not satisfied with the Calgary Assessment Review Board’s decision, you can appeal further to the Municipal Government Board of Alberta. This second-level appeal must be filed within 30 days of receiving the CARB decision. The Municipal Government Board conducts a fresh review of the evidence and can uphold, reduce, or increase the assessed value.

Calgary Property Tax Assessment Appeal: Key Deadlines and Costs

The table below summarizes the key deadlines and costs associated with appealing a Calgary property tax assessment:

Stage	Deadline	Cost
File formal complaint with CARB	March 31 each year	$30 residential / $650 non-residential
CARB hearing scheduled	April to September	No additional cost
Appeal to Municipal Government Board	Within 30 days of CARB decision	Filing fee applies
Property tax payment due	June 30 each year	Based on assessed value

One important point about property tax payments during an appeal: you are still required to pay your property tax bill by the June 30 deadline even if your appeal is pending. Non-payment results in late payment penalties regardless of the appeal outcome. For everything you need to know about when and how to pay your Calgary property tax bill, our guide on Calgary property tax payment covers all payment methods, deadlines, and penalty details in full.

What Happens After a Successful Calgary Assessment Appeal?

A successful appeal results in the Calgary Assessment Review Board issuing an order to reduce your assessed value to the amount supported by the evidence. The City recalculates your property tax based on the revised assessed value and issues an adjusted tax notice.

If you have already paid your original tax bill, the City refunds the difference or applies it as a credit against future property taxes. The corrected assessed value may also carry forward to influence future years’ assessments, which can produce ongoing savings beyond the year of the appeal. A reduced assessment also affects property-related financial planning decisions. For property owners who are also managing corporate structures, rental income, or real estate transactions alongside their property tax obligations, our Real Estate Tax services in Calgary provide professional support across every layer of property-related tax compliance.

Our team at Tax Return Filers Ltd. provides Calgary Corporate Tax Filing, Bookkeeping in Calgary, and Calgary Accounting Services to help Calgary property owners and business owners stay fully compliant with every tax obligation and never miss a critical deadline.

Conclusion

A Calgary property tax assessment appeal is a structured and accessible process that every property owner has the right to use when their assessed value does not accurately reflect market reality. The key is acting within the March 31 deadline, presenting clear and well-documented evidence, and understanding the specific legal grounds that the Calgary Assessment Review Board considers. Even a modest reduction in assessed value can produce meaningful tax savings that compound over multiple years.

If you want professional support navigating Calgary property tax obligations or any other tax matter affecting your Calgary property or business, Tax Return Filers Ltd. are here to help you stay on top of every deadline and obligation throughout the year.