![california franchise tax board logo](https://goldrushcam.com/sierrasuntimes/images/2018/april/california-franchise-tax-board-logo.jpg)
The extension does not apply to estimated tax payments due on April 15, 2021.
Source: FTB
Related: IRS Announces Tax Day for Individuals Extended to May 17: Treasury, IRS Extend Filing and Payment Deadline – Only Applies to Federal Taxes Not State Taxes