My Account is a secure portal that lets you view your personal income tax and benefit information and manage your tax affairs online.
My Account – https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/account-individuals.html
Businesses e-Services – https://www.canada.ca/en/revenue-agency/services/e-services/e-services-businesses/register.html
Authorize a representative – https://www.canada.ca/en/revenue-agency/services/tax/representative-authorization/overview.html