First, she can't sue you for claiming her daughter, threatening to take you unless you pay her is called extortion, the more common name is blackmail. Second, if she didn't give you permission; then how did you know the child's social security number? People are usually pretty secretive about those. Third, claiming a deduction for a person that you don't qualify for (generally for a child his would mean she lives with you and you pay her living expenses) Is tax fraud. You don't get sued for tax fraud, it's a crime. You'd be indicted. My advice would be to file an amended return, which doesn't claim her.
Answered on Feb 03rd, 2015 at 4:39 AM