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Notices of Change


All condominium corporations are legally required to file a notice of change with the Condominium Authority of Ontario (CAO) when certain information filed in a return has changed or needs to be corrected. The requirement to file notices of change is set out in Ontario Regulation 377/17, which is a regulation under the Condominium Act, 1998.

When filing a notice of change, condo corporations will indicate what information has changed or is being corrected, and if required, when the change(s) took effect. All notices of change must be filed online, using the CAO’s user-friendly filing system.

When to file a Notice of Change

For a list of what types of information changes require a notice of change to be filed, please refer to our overview below:

Please note that notices of change can also be filed to correct most information provided in a prior return.

Guide to Filing a Notice of Change

The CAO’s online filing system is designed to make the returns filing process easy and user-friendly. If you have questions, please refer to the CAO’s helpful filing guide which can be accessed through the link below:

Notices of Change

Ready to file?

If you have questions, please contact the CAO if you have questions or need assistance by clicking here.