I have the same question and don't see answers either on this message board or the FTB website.
Simply this question: should estimated taxes paid on 10/16/23 use both of the estimated tax forms (with due dates of 4/18/23 and 6/15/23) with separate payments, or one of the form and one payment?
I will attempt to find an answer via the FTB "chat" function during the available hours.
