I also have an overpayment of estimated taxes in the first period (through 7/15 due to COVID-19) which does not carry over to the second period which is line 20 of column (c) on Form 2210 part IV. Instead, the overpayment is transferred to line 20 of column (b) which is a "dead" column. Laziness by the IRS has left four columns on the form where only three are required this year. The IRS decided to use only columns (a), (c) and (d). Unfortunately, TurboTax does not understand this and has not revised Form 2210 accordingly. The issue is clear to me but I've read several posts from people who have spent hours on-line with TT Support trying to explain this problem to them.
