An automatic two-month extension is available by default to U.S. citizens or resident aliens who live outside of the United States (including situations when you are in military or naval service overseas). They have two more months to file the tax return, but the federal income tax must be paid on the regular due date of your return. Otherwise, the interest charge is assessed. The regular due date of your return for the tax year 2020 is May 17th, 2021, and an extension will allow you to extend the due date to file your return to June 15th, 2021. All you need to do is attach a statement to your tax return explaining that you qualify for this extension as a U.S. person abroad.