Which box do I record My CPP pension income in. I had put it in Box 16 but that gave me a warning that i was over 60 and had not claimed any Cpp income???

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Box 16 of the T4A(P) CPP Benefits slip is Disability Benefits.  If your CPP benefits were for retirement, the amount should be in Box 14, and the number of months of retirement for the year should be in Box 23