The dependent interview, for divorced parents is tricky. I will assume you are the non-custodial parent (the child spends more nights with the other parent than with you).

The number of months you enter for the child lived with you must be 6 or less. The child's birth date must indicate he is under 19. Answer no to the support question (note that the question is not whether YOU provided more than half the support). Answer yes to the custody agreement question. Answer no to the question about the other parent claiming him.

As the non custodial parent you can claim the child's exemption (dependency) and the child tax credit (if he is under 17). But you cannot claim the Earned Income credit, day care credit or Head of Household filing status.