Q. Can I also use the 1098-T to determine if I am eligible for the American Opportunity Credit?
A. No.
If you son has already claimed some or all of the tuition for the 1099-Q, TurboTax (TT) can not determine if you are eligible to claim the American Opportunity Credit (AOTC), on your return. You have to do the math. You would then adjust the 1098-T to only use the left over tuition (and other qualified expenses, books & computer) for the AOTC. Yes, the 1098-T can be entered on both returns, but with modifications.
