Individuals who must make estimated payments

If you didn't pay your last installment of estimated tax by January 18, you may choose (but aren't required) to file your income tax return (Form 1040 or Form 1040-SR) for 2021 by January 31. Filing your return and paying any tax due by January 31 prevents any penalty for late payment of the last installment. If you can't file and pay your tax by January 31, file and pay your tax by April 18 (April 19 f you live in Maine or Massachusetts).