I was just notified by my daughters father that he claimed her on his taxes. We were never married and I have claimed her for the last 11 years (she is about to be 12). I have full physical custody and we share legal. He pays child support on a regular basis. Can he claim her without my permission? He lives by himself, I am now married and we have three (3) children in our house hold (including the daughter from my ex) and we also pay child support for my husbands daughter who does not live with us. What can I do now that he has already done his taxes?