All condominium corporations are legally required to file a notice of change with the CAO when information filed in a return has changed. The requirement to file notices of change is set out in O. Reg. 377/17, which is a regulation under the Condominium Act, 1998.

All notices of change must be filed with the CAO through our user-friendly online returns filing system.

When to file a Notice of Change

For more information what types of changes require that a notice be filed, please refer to the overview below:

Notices of change must be filed within 30 days of the change(s) and must indicate what changed and when the change(s) took effect.

Notices of change can also be filed to correct any information provided in a prior return.

Guide to Filing a Notice of Change

The CAO’s online returns notice of change filing system is designed to make the filing process easy. If you have questions, please refer to the CAO’s Guide to Filing Returns and Paying Assessments:

Ready to file?

File a Notice of Change

What if I have questions?

If you have questions or need assistance, please call the CAO at:

  • Local: 416-901-9356
  • Toll-free: 1- 800-854-9014