October 15, 2020 is the filing deadline for 2019 federal tax returns on extension. Even though the initial tax filing deadline was pushed back this year from April 15 to July 15, the standard six-month window for filing extended returns has shrunk to three months from July to October, and October 15 remains the final due date for filing 2019 federal returns in 2020.Read more about extension reminders at Forbes.com.