<prompt> Human: My girlfriend has been living with me since last March. She moved out of her parents house to do so. I asked her to double check with her dad and see if he he already claimed her as a dependant. He said no. Flash forward to now, tax returns were rejected. Apparently someone has claimed her as a dependant. Either her dad lied to us and claimed her which is really dishonest considering she hasnt loved there for over a year or a third party has claimed her. Realistically, how should I proceed? Am I making a mountain out of a molehill?  <response>: You should file her return on paper.Eventually, the IRS will send a letter to her and to whoever claimed her on their return, saying This SSN appears on multiple returns. Someone should fix it.She should not fix it.The IRS may then choose to audit one or both of her return and the other one. She would be fine.It may not be the father; there are many scammers who put in returns claiming 20 children then take the refund and run.She should not fix it. 