Tax Extension Deadline 2025. Today, july 31, is the last day to file your income tax returns, so here is all you need to know to do so quickly — including the deadline,. There's no final date for the transmission of electronic 1120 returns.

Those who file irs form 4868 on or before april 15, 2025, to request a tax extension have until oct. You can use irs free file at irs.gov/freefile to request an automatic.