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Returns and Notice of Change

On this page you will find all the information you need to assist your condominium corporation in meeting its legal obligation to file condominium returns and notices of change with the Condominium Authority of Ontario (CAO). Before you begin filing a return or a notice of change, the CAO strongly encourages you to review the information below.


All condo corporations are legally required to file returns with the CAO. Filing a return means providing the CAO with key information about the condo corporation, such as the date it was registered, its address for service, and information about the current board of directors.

Notices of Change

All condo corporations are legally required to file a notice of change with the CAO when certain information filed in a return has changed or needs to be corrected. Notices of change must be filed within 30 days of the change(s) indicating what has changed and when the change(s) took effect.

Before Filing a Return or Notice of Change

Step 1: Create a CAO account and manage your condo corporation profiles

If you have been designated to file a return or a notice(s) of change on behalf of your condo corporation, you will require a CAO account and the ability to “Act on Behalf of” your condo corporation. For assistance with creating an account, please click on the link below to access a guide to creating accounts on the CAO website.

Step 2: Review the CAO’s filing guides

The CAO has developed guides to help you file returns and notices of change. These guides include step-by-step instructions and helpful screenshots to assist you with the filing process:

Step 3: Gather your information

The return’s filing process will require you to provide certain key information about your condo corporation. As such, you will need to carefully gather the most up to date information about your condo corporation before you file. For more information on the information that is required for condo returns and notices of change, please click on the link below:

Note: The CAO is legally required to display most of the information filed in returns and notices of change in its Public Registry.

Step 4: File your return or notice of change below

Returns and Notice of Change

Once you are ready, click on the button below to start filing

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