Income tax returns are generally due on or around April 15 each year. If you can't file on time, you can file for an automatic six-month extension using Form 4868. Keep in mind that the extension applies to filing your tax return—not to paying any taxes you may owe. To avoid penalties and interest, you'll need to pay your taxes by the regular filing deadline (usually April 15, but April 18, 2022, for tax year 2021).