I have done this, but there is no way to file that as an amended return.
It's a bit complicated, but the service I used before doesn't let me do state returns because I lived in multiple states and they can't handle it. When I entered my federal return here it found much larger savings so I wanted to submit as an amended return.
Unfortunately that is not possible, and despite paying for support they will not pick up the phones. They promised to call me back twice but they have not. So clearly this is a useless service and I will be going with someone else next year.
