Your 2021 calendar year tax return is due no later than midnight, April 15, 2022.
File your return as soon as you can after January 1, 2022, but no later than April 15, 2022. Because April 15, 2022 falls on a federal holiday, you have until Monday, April 18, 2022 to timely file your 2021 tax return.
If you are a fiscal year filer, your return is due on the 15th day of the fourth month following the close of your fiscal tax year.