California income tax returns are filed with the Franchise Tax Board.

When to File:

• Tax returns for 2025 are due Wednesday, April 15, 2026 for most filers.
• For people who have requested an extension in filing, tax returns for 2025 are due Thursday, October 15, 2026.

Web pages

• Home - https://www.ftb.ca.gov/
• When to File - https://www.ftb.ca.gov/file/when-to-file/