The tax day deadline is also the last day to file Form 4868 requesting an extension to file your individual income tax return. If you won’t be ready to file your tax return by tax day, make sure you instead complete an extension request, granting you the ability to delay filing a completed return until October 16, 2023. But remember, even if you choose to file an extension, you are still required to pay any taxes you may owe by the April deadline.