The due date for 2012 individual federal income tax returns is April 15, 2013. If you are not able to file your federal income tax return by the due date, filing an extension gives you an additional six months–to October 15, 2013–to file your return. However, the extension does not give you extra time to pay any taxes due. If you do not pay any taxes you owe by April 15, 2013, you will owe interest on the tax due, and you may also owe penalties. Special rules apply if you’re living outside the US or serving in the military outside the country on April 15, 2013.