I figured it out. I had underestimated my income when choosing an Obamacare policy. Therefore, I have to pay back some of the premium help I received. TurboTax figures that from the 1095 form, but it was not immediately apparent what was going on--until I went to the actual forms, rather than my usual way of completing the federal form by simply answering Turbotax questions, and letting the Turbotax do the final check for any errors.
