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.As a result, affected individuals and businesses will have until June 17, 2024, to file returns and pay any taxes that were originally due during this period. We automatically allow a 7-month extension for businesses to file Form 100 (coming soon) that are not suspended. This includes exempt organizations. This gives you until October 15 to file without penalties. 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. According to the IRS, deadlines falling on or after Jan. 21 and before June 17 are granted additional time to file. The tax deadline in California is Nov.