@Critter-3 is correct. Some states allow the debit payment to be enabled when filing the tax return, while many others don't. It would be nice if we had an FAQ list of which states allow it , and which don't, but it can change every year. NC just started allowing it a couple years ago.
In the past years, Indiana has required the payments for balance due, to be submitted entirely separately and must be done by the taxpayer separately from their e-file.. Apparently that sounds like it is true for Indiana's 2021 taxes too, but they (Indiana) could change that any future year.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
