My kids have insurance through my job since 2015. I always claim 1 of my kids. This year IRS send a letter saying my son was covered by the marketplace under my ex wife account so I need to send a 1095A form. My ex wife refuse to give me a copy to send to IRS. How can I proceed? IRS will not release my refund until I send the letter, and If I have my kids under my insurance is not illegal that my ex wife put them on a marketplace insurance??
Talk to your divorce attorney. If your divorce decree allowed you to claim the dependent child then your ex might be in contempt of the decree by refusing to provide information that allows you to claim.
This has happened to me as well for the last 2 years. have submitted a letter to the IRS along with proof that my dependents had medical insurance through my job all year. I just send in medical coverage certification from the insurance company and a copy of 1095-B supplied by my employer and the IRS approved my return.