Before you can create a My Business Account with the CRA, you must already have a CRA My Account. To create a My Business Account, log in to your CRA My Account, then click Add Account in the top right corner. Select Business Account, then, if you have already have a business number, select Add an existing business number (BN). If you do not already have a business number, reach out to us to assist you in obtaining this.
Once your My Business Account is set up, you'll keep using the same login. After signing in, just choose which account you want to access.
You can find the link to log in to My Account below.