When Are Estimated Taxes Due 2024 California Time. Business entities whose tax returns are normally due on march 15, 2024, and april 15, 2024. Yes, california state estimated tax payments have specific due dates, which are as follows:

There is a difference between how california treats businesses vs. The california tax deadline extension covers tax filing and payment deadlines initially falling between january 21, 2024, and june 17, 2024.