Quick Scoop

California personal income tax returns and any balance due are due on April 15, 2026. California also gives an automatic extension to file until October 15, 2026 , but payment is still due by April 15 to avoid penalties and interest.

Key dates

  • File and pay: April 15, 2026
  • Automatic filing extension: October 15, 2026
  • Estimated tax payments: April 15, June 15, September 15, and January 15 each year; for 2026, the fourth-quarter payment is due January 15, 2027

Small note

If your tax due date falls on a weekend or holiday, it can move to the next business day, but for 2026 the California personal return deadline is April 15.

If you want, I can also give you the California business tax deadlines or the 2026 estimated tax schedule in a simple table.