March 18, 2021 - The California Franchise Tax Board reports similar to the federal tax filing and payment deadline extension, California will also extend the state tax filing and california franchise tax board logopayment deadline for individuals to May 17th, 2021.

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