Answer:
$0 (at least under current laws)
Step-by-step explanation:
Child support payments are not tax deductible. Even alimony payments made to former spouses are not tax deductible anymore.
Any property settlements resulting from a divorce are not tax deductible either nor are they considered taxable income for the receiving party.
So in this case, until the current law changes, Carter cannot deduct any amount from his tax return.