What you're describing is exactly the BUG in Turbo Tax: "The amount in line 6 (Federal) is a 2021 estimated tax payment that, based on information you provided in earlier posts, should be part of the amount in Line 11a of Form 2210" My Tax Worksheet has an amount - the overpayment amount - on line 6 on the Tax Payments Worksheet. This amount is NOT used in TT for Form 2210. Instead, TT is showing 0 for the amount on Line 11a of Form 2210.
