Deductions & credits

@Opus 17 

My husband is a Prison Chaplain employed by the State. They gave him a letter to elect whether to have them deduct the allowance, BUT he did not complete it and turn it in to them; S.S. and Medicare were taken out of his gross pay and there's no allowance shown on his W-2. Everything I've read suggests that in order to take this allowance the amount has to have been determined prior to being paid. However, he is being told that we can still claim this allowance. Do you know if this is true, and if so how? Do I put the amount in Other Deductions?