If you are unable to file your federal income tax return by the due date, you may be able to get an extension from the Internal Revenue Service (IRS). But this does not grant you more time to pay your taxes. You may be able to get an automatic six-month extension to file your return. To do so, you must file IRS Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return by the due date for filing your calendar year return (usually April 15) or fiscal year return. For a Spanish version of this form, download IRS Form 4868sp.