The due date to file your California state tax return and pay 5 any balance due is April 15, 2025. You must file a claim with the State Controller's Office.If your claim is eligible, you will be given the option to file electronically. This is the easiest way. If you are self-employed, you must attach the last. To collect money, you must first get an EJ-130 Writ of Execution. Victims of severe winter storms, flooding, and mudslides in California beginning Jan. 8, 2023, now have until Oct. Copy your account number on the memo line. This isn't strictly required, although the business you're paying might require it.