Интересный факт:
The Canada Revenue Agency (CRA) is now offering a second login option in addition to the CRA user ID and password. You may be able to use your online banking information to log in to the My Business Account service. The new login option means that you will have one less password to remember.
This option is available for those who already use online banking services with TD Bank Group, Scotiabank, and BMO Financial Group.
Так. глядишь, дойдем и до single sign-on.