Please double check your T4A(P) slip and what boxes you have filled in.
Box 21 is for Number of months - disability.
Box 23 is for Number of months - retirement.
If you have something in Box 14 - Retirement benefit, then you need a number of months in Box 23.
If you have something in Box 16 - Disability benefit, then you need a number of months in Box 21.
