I'm in Illinois. The wife and I wanted to file our 2017 taxes married filing seperately. The person who did our taxes instead put me under a different address as single and my wife under our address as head of household. We didn't realize she gave us different filing statuses, because we are married. I did live at a different address because we were seperated. Now we want to file married jointly for 2018 because I am back at home, but we don't know if this will cause a problem with the IRS.