Just pulled from the FTB website:

Pass-Through Entity (PTE) Elective Tax Payments Due October 16 

As a reminder, there are two payment due dates for the PTE elective tax. The first payment is due on or before June 15, during the taxable year of the election. The amount due is $1,000 or 50% of the elective tax paid for the prior taxable year, whichever is greater. The remaining amount is due on or before the due date of the original return without regard to extensions.  

Due to the 2022-2023 winter storms, individuals and businesses located in California (except for those located in Lassen County) generally qualify for an extension until October 16, 2023, to file and pay taxes. This extension applies to applicable payments of the PTE elective tax.