Why does line 340 Schedule 9 show $2,528 but I only entered $1820 worth of charitable donations? CRA is asking me! I cannot figure out where the extra $ 708 came from.

To view the carried forward donations, navigate to the Donations section of your return. (If you have prepared your return using the Forms method, refer to the form titled Carry Forwards from 2016 - CFP to view any amounts carried forward from previous years.)

If you have charitable amounts from payroll deductions, check box 46 of your T4 slip for additional amounts.