CRA sign-in services – Canada.ca
… businesses on how to register for a Government of Canada login required to have access to the online secure Canada Revenue Agency (CRA) login services.
CRA login – Canada Revenue Agency/Agence du revenu du Canada
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Using a Sign-In Partner – Canada.ca
To access the CRA’s services using a government-issued credential you will need to register for a CRA user ID and password.
My Account for Individuals – Canada.ca
My Account is a secure portal that lets you view your personal income tax and benefit information and manage your tax affairs online.