Box 20 of the T4A(P) is "Taxable CPP benefits" which is the total of all the CPP benefits you have received (boxes 14, 15, 16, 17, 18 and 19). It's automatically calculated by the software and doesn't need to be entered manually.
TurboTax Expert Assist
Get answers to all your tax questions
Our experts are available on-demand, no appointment needed. Get help all year long with TurboTax Expert Assist.