Makers point about messing up one's proper penalty amount is true IF the dates associated with the payments listed on the Tax Payment Worksheet are not the true dates. But on that Worksheet I am reporting the true/correct dates with the true/correct amounts for each of the actual Fed Est Tax payments that I made, and the Form 2210 line 19 amounts for the 3 period columns are each calculated by TurboTax correctly, when I include an "extra" zero-valued (fictitious) payment (for a date within the 1/1/20 thru 7/15/20 period for the first column) as the SECOND entry in the list of payments on the worksheet.
In other words, suppose my actual Fed Est Tax payments for the four normal quarterly periods were actually as follows (in chronological order):
<date1> <amount1>
<date2> <amount2>
<date3> <amount3>
<date4> <amount4>
Instead of entering them exactly as shown above, I deliberately make the following entries on the Tax Payments Worksheet:
<date1> <amount1>
<date2> 0
<date2> <amount2>
<date3> <amount3>
<date4> <amount4>
Each of the non-zero payment entries still has its true/correct date and true/correct amount, the entries are still in chronological order, and their total is still true/correct. But there's a zero-valued "extra" entry in the SECOND position in the list. The calculations made by TurboTax for the line 19 amounts on Form 2210 seem to completely ignore that particular entry, yet seem to use each of the other non-zero entries properly, with the desired true/correct results appearing on line 19.
At least, this is the "workaround" that is working for me. YMMV
