Tax Deadline: Due Date of 2017 Returns on Extension

If you obtained a filing extension for your personal 2017 income tax return (Form 1040) and have not yet filed, today is the deadline for getting it in; you can still e-file the return. If you fail to file by today, you will owe a late filing penalty; no additional extensions can be granted. Calendar-year C corporations on extension must file Form 1120 for 2017 by today. Victims of Hurricane Florence have more time to file.