Main CRA Home Page: www.canada.ca/en/revenue-agency.html
Tax Topics for Individuals
For a variety of individual tax information such as My Account for online access to your Individual tax information about your tax return (includes payment information and important dates).
Tax Topics of Businesses
For a variety of business tax information, such as My Business Account for online access to your Business tax information, About your Payroll, GST and Corporate tax returns.
Individual Tax Calendar
Important dates for filing and payments
Payroll Deductions Calculator
Calculation of withholdings from payroll payments
Forms and Publications
List of CRA forms available online
My Service Canada Account
(Register to see what your Canada Pension Plan benefits are projected to be on retirement)