Irs Extension Deadline 2025 October. If you’ve filed for an extension by mailing form 4868, you will have until october 15, 2025 to submit. The due dates for these 2025 payments are april 15, june 17, september 16, and january 15 (2025).

If you’ve filed for an extension by mailing form 4868, you will have until october 15, 2025 to submit. There’s no final date for the transmission of electronic 1120 returns.