Quick answer. The City of Calgary issues property tax assessment notices in early January each year, valued as of July 1 of the previous year. If your assessment exceeds actual fair market value, the excess costs you approximately 0.65% per year in overpaid property tax on the differential (Calgary residential tax rate approximate). To appeal, file a complaint with the Assessment Review Board (ARB) by the deadline printed on your assessment notice — typically early March. Residential complaint filing fee is currently $50; commercial higher. The successful appeal requires evidence of the property's actual fair market value: comparable sales within 12 months of the July 1 assessment date, plus any specific property conditions that reduce value (damage, needed repairs, unfavourable location factors). Success rates on Calgary residential assessment appeals in typical years run approximately 30-40% for well-documented appeals. Not every over-assessment is worth appealing — the appeal effort (typically 5-10 hours of your time) has to justify the annual tax savings. For assessments $30,000+ over actual value on a Calgary rental, appeal is typically worth it; below $15,000 over, the effort exceeds the return in most cases. Sources: City of Calgary Assessment Review Board process, Alberta Municipal Government Act assessment provisions, standard Calgary residential appeal practice.
The Assessment Cycle
- January (early): Assessment notices mailed to property owners.
- January-early March: Assessment inquiry period — talk to the City assessor about specific concerns before filing formal appeal.
- Early March (specific deadline on notice): ARB complaint filing deadline.
- March-October: ARB hearings scheduled.
- October-November: Property tax bills issued based on final assessments.
- June-October: Property tax payments due.
Filing the Complaint
- Access the Assessment Review Board portal on the City of Calgary website.
- Complete the complaint form identifying the property and the assessment being disputed.
- Pay the filing fee ($50 residential, higher for commercial).
- Choose complaint type: full ARB hearing or Written Review (paper-only, faster, no in-person hearing).
- Wait for hearing date assignment.
Building the Evidence Case
The ARB decides based on evidence of fair market value. Effective evidence:
1. Comparable Sales Within 12 Months of Assessment Date
Sales of comparable properties in the same neighbourhood, within 12 months of the July 1 valuation date, of similar property type, size, and condition. Pull from CREB, Realtor.ca, or a Calgary REALTOR (some REALTORs will pull comparable sales for the ARB filing at a small fee, typically $150-$300). Aim for 3-5 solid comparable sales that support the value you are asserting.
2. Property Condition Documentation
If your property has specific issues that reduce value (foundation issues, deferred maintenance, adjacent unfavourable land use, etc.), document with photos and any inspection reports. The assessor's value assumes standard condition; documented adverse condition supports value reduction.
3. Rental Income Data (For Rental Properties)
The City's assessment approach for rental properties can use income-approach valuation. Providing verified rental income lower than the assessor assumed can support a reduced value. Use actual rent rolls plus operating expense documentation.
4. Comparable Assessed Values in the Neighbourhood
Values of comparable properties in the same area. If your property is assessed materially above similar neighbours, that supports value reduction. The City publishes comparable-property assessments through the Assessment Search tool.
When Appeal Is Worth It
- Assessment $30,000+ over actual market value: typically worth the effort. Annual tax savings of $195+ per year of overpayment.
- Assessment $15,000-$30,000 over: judgment call. Some owners appeal for principle even at low return.
- Assessment $15,000 or less over: appeal usually not worth the 5-10 hours of your time.
- Multi-year overpayment risk: appeal now prevents future years' overpayment at the elevated basis, compounding the benefit.
The Success Rate Reality
Alberta ARB residential success rates in typical years: approximately 30-40% of well-documented appeals succeed in some assessment reduction. Rate varies significantly by evidence quality — thin evidence (single comparable, no property condition documentation) typically produces near-zero success; robust evidence (3-5 comparable sales, condition documentation, income analysis for rentals) approaches or exceeds 50% success in appropriate cases. Not every appeal succeeds; the process rewards effort and documentation.
The Written Review Alternative
The Written Review path is faster and does not require in-person hearing. The tradeoff: no opportunity to argue in person, no cross-examination of the assessor's evidence, decision on the written submission only. Well-suited to straightforward comparable-sales cases; less well-suited to nuanced situations where oral argument matters.
Frequently Asked Questions
Do I need a lawyer or paralegal for the ARB?
No. Self-representation is standard and often successful. For complex commercial assessments or multi-property portfolios, professional representation (typically a property tax consultant on a contingency-fee basis) may add value. Contingency fee typically runs 40-50% of the first-year tax savings.
What if I miss the appeal deadline?
You cannot appeal that year's assessment. The next opportunity is the following year's assessment notice. Ensure the appeal deadline (typically early March) is calendared.
Can I appeal every year?
Yes, each year's assessment is a separate appeal opportunity. Successful appeal in one year does not automatically reduce future years' assessments; each year's assessment is independent.
Does UrbanLease help with property tax assessment appeals?
UrbanLease's core service is RECA-licensed property management. For assessment appeals on managed properties, we provide rent-roll and operating income data supporting income-approach valuation arguments and can refer to Calgary property tax consultants. Property management services provided by Chabi.ca.
Bottom Line
Calgary property tax assessment appeals are workable for self-represented landlords with $30,000+ over-assessment. File before the early-March deadline, gather 3-5 comparable sales plus condition documentation, and choose Written Review or full hearing based on case complexity. Success rate approaches 50% on well-documented appeals. UrbanLease supports owner clients with rent-roll and operating data for income-approach appeals under Chabi.ca.
Reviewed 2026-08-02. General information only, not legal or tax advice. Assessment Review Board deadlines and fees change annually; verify current dates and fees on the City of Calgary assessment portal.