California Tax Filing Deadlines

Standard Deadline: April 15 (or next business day if weekend/holiday) for calendar-year filers.

Automatic Extension: File Form FTB 3519 by April 15 → extends filing to October 15. Payment of estimated tax due is still required by April 15 to avoid penalties/interest.

Fiscal Year Filers: 15th day of 4th month after fiscal year-end; extension to 15th day of 10th month.

Always confirm current year dates via FTB.ca.gov.