Expats may be allowed an automatic 2-month extension of time to file your return and pay any federal income tax that is due. You will be allowed the extension if you are a U.S. citizen or resident alien and on the regular due date of your return:
• You are living outside of the United States and Puerto Rico and your main place of business or post of duty is outside the United States and Puerto Rico, or
• You are in military or naval service on duty outside the United States and Puerto Rico
If you use a calendar year, the regular due date of your return is April 15, and the automatic extended due date would be June 15. If the due date falls on a Saturday, Sunday, or legal holiday, the due date is delayed until the next business day.
Even if you are allowed an extension, you will have to pay interest on any tax not paid by the regular due date of your return.