There is no such thing as a "1098-T tax credit". As others have indicated, ther are two education credits that having a 1098-T may make you eligible for. The more generous "American Opportunity Credit'' (AOC or AOTC) is limited to being claimed four times, for each student. There is no limit to how many times the Lifetime Learning Credit (LLC) can be claimed. The LLC is 20 % of tuition paid (up to $10K) and is non-refundable (it can only be used to reduce your actual tax liability).
The student must be yourself, your spouse or your dependent.
