Supplementary Assessment & Tax Notice
What is supplementary assessment?
Supplementary assessment reflects the increase in value of a property where a new home or building is completed or occupied during the current tax year. The assessed value shown on the Notice reflects the value of your property based on July 1st of the previous year, economic conditions and its physical condition and characteristics as of December 31st of the previous year.
How does supplementary assessment and tax work?
If your property is newly constructed, has had improvements or an addition, and was completed / occupied in the current tax year, you will receive a Supplementary Assessment and Tax Notice in addition to the Annual Tax Notice. The Supplementary Notice will be mailed to you in either July or October depending on the completed or occupied date. The payment due date for the notice will either be August or November (respectively).
The Supplementary Notice will reflect the new assessed value of the property. The taxes are pro-rated to the end of the year, from the date of completion / occupancy.
How is supplementary tax calculated?
Here are some examples of how the City of Airdrie calculates supplementary tax on residential property:
Supplementary Assessment Notice
| Type of Property: | Residential Single Family |
| Total Assessment | $350,000.00 |
| Less Old Assessment Shown on Annual Tax Notice | 150,000.00 ————— |
| Supplementary Assessment | $200,000.00 |
| Improvement Completed and/or Occupied on Pro-rated Supplementary Assessment | Oct. 1st |
| ($200,000.00 x 3/12) | $ 50,000.00 |
- The tax levy is then applied to the pro-rated supplementary assessment to calculate the taxes due on the supplementary assessment.
- Assessments within the City of Airdrie are based on typical market values with a valuation date as of July 1st of the previous year.
More Information
Download the Supplementary Assessment and Taxation brochure.