Once you log in to your CRA My Account, you are directed to a page titled CRA Login and Security Options. From there, click on the Revoke CRA User ID link. The following page prompts you to re-enter your password. Once you have entered your password again, click the Revoke button to confirm. By doing these steps, you will no longer be able to use your user ID with the CRA login services. To cancel this process without revoking your access to the site, click on the button to return to the CRA Login and Security Options page before confirming.
Register for a CRA My Account.
Learn more about registering for a CRA My Account.