An update just happened on Jan 30 which made the penalty calculation even further incorrect. :(
The CA FTB has published the final 5805 and instructions some time ago, and I can see that Turbo Tax has the Payment Due Dates from the 5805 Instructions page 4 Worksheet II - Regular Method to Figure Underpayment and Penalty totally wrong. It has the first two installments due on 4/15/2020 and 6/15/2020, when they both should be 7/15/2020.
Why is TurboTax lagging so far behind what the CA FTB has already published?
