Thank you. I think I found at least part of the problem. If you lived in certain counties in California, both the IRS and the FTB allowed the following for paying taxes (including estimates) in 2023: the due dates for 1st, 2nd and 3rd quarters were delayed to October 15, 2023. I entered the actual date I paid (October 4th) and the total paid. In digging into fed return, I found TTax completed form 2210 - Underpayment Penalty. It calculated penalty based on not making 1st-3rd Q payments until October. This appears to be a serious glitch for California filers. Not sure how to proceed. I sure don't want to have the IRS mess with my numbers.
