Based upon what you have written about as to the tax issue deduction you need to have a meeting with the other parent as to how such is going to be taken care of. Ordinarily the parent that has the minor child the least and pays child support gets to claim the minor as a dependent on taxes absent an order from the court to the contrary.As to your question, you do not need permission to claim the minor as a dependent upon your taxes based upon what you have written.