Supplemental Taxes & Assessments

Each year, Annual Property Tax and Assessment Notices are mailed in March. These notices reflect the assessed value of your property as of December 31 of the previous year. 

Your Annual Tax Notice is mailed in June and is based on this assessment value multiplied by the current year’s tax rate. These taxes cover the period from January 1 to December 31. 

If new construction or improvement(s) were completed or occupied during the current year, a Supplemental Tax/Assessment Notice will be issued in November to reflect the increase in property value that was not included on the annual assessment notice. The taxes are prorated to reflect the number of months the new construction or improvement is complete or occupied. For example, if the number of supplementary months is 4, the billing is for the months September, October, November, and December.   

This is calculated by multiplying the supplemental assessed value of your property by the applicable property tax mill rate(s), divided by 12 months in the year, then multiplied by the supplementary months on the supplemental tax bill. 

Let’s say you built a new home in 2025. 

June 2025 

Everyone receives their annual tax bill in June, which is based on the March assessed value (taxed from January 1 to December 31).

Your property was still under construction on that date; your June bill only included the value of the land and the partially built home—assessed at $225,000 (stage of property as of December 31, 2024). 

Based on that value, your annual tax bill was $1,226.91 (calculated by multiplying the tax mill rate by the assessed value).

November 2025 

After your home was completed and occupied in July, the City issued a Supplemental Tax/Assessment Notice to account for the additional value of the completed home for the remaining six months of the year (July–December).

• The additional assessed value of the completed portion is $310,000.
• The supplemental taxes owing for July–December is $845.20.

How it is calculated:

(310,000 x mill rate ÷ 12) x 6 = 845.20

December 21, 2025  

Supplemental Taxes are due.  

This completes the properties assessment for the year and ensures everyone pays their fair share of the municipal taxes and Alberta School fund taxes.