Look at the 1040X form- the amount on Line 22 would be the additional amount (if any) he is getting back. (Not knowing everything that you changed) - it is more likely $100 is the correct refund and he has to pay back $350- this would be LIne 20 of the 1040X.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
