These are some links you may find helpful for both planning your taxes and you personal financial affairs.
Service Canada - CPP/OAS/Employment Income
*Please note the first option is an Alberta specific log-in - You are are on the right page. Scroll down to your preferred method of access (Sign-in-Partner or GCKey)
CRA - Tax Information
Benefit Payment Dates - All Benefits (CPP, OAS, CTB, GST)