My ex-husband was committing tax fraud while we were married. What can I or should I do. He was not reporting income in excess of $150,000 a year. We filled joint returns & I was a stay at home Mom. Only in our divorce did I actually have access to the tax documents and his bank statements to see the severity of his fraud. I had questioned him about the returns during our marriage and he would physically and verbally would intimidate me into signing them. What do I do?