Last Day To File Taxes 2024 California. This extension applies to the 2023 tax returns normally due on tax day, april 15, 2024. Filing and payment relief for affected taxpayers in san diego county in california.

Pay the amount you owe by april 15, 2024 to avoid penalties and interest. 15 without making a payment on tax day and end up owing $1,000, you’d also be required to pay 0.5% for each of.