You may file Form 1040, Form 1040A or Form 1040EZ any time before the six-month extension period ends. You must make a proper estimate of your tax for the year.If you need more time to file, we give you an automatic extension. The deadline is December 16, 2025. This gives you until October 15 to file without penalties. You must use Form FR-127 to request an extension of time to file a DC individual income tax return. The tax deadline in California is Nov. 16, 2023, if you lived in a federally declared disaster area included in at least one of three different declarations. Affected taxpayers in certain counties will have until June 17, 2024, to file returns and pay any taxes that were originally due during this period. WASHINGTON — The Internal Revenue Service today further postponed tax deadlines for most California taxpayers to Nov.