Websites such as The Canada Revenue Agency (CRA), and places to find all the forms you need online.

If you have a good one to add, or if you find one here that does not work, please let me know.

Disclaimer: These links are to sites out of my control. I do not accept responsibility for what you may find there or the consequences of following their advice etc. In all cases, check with a trusted local professional before making significant decisions in this area.