If you are a U.S. citizen or resident alien, the rules for filing income, estate, and gift tax returns and paying estimated tax are generally the same whether you are in the United States or abroad. Your worldwide income is subject to U.S. income tax, regardless of where you reside.
Who Must File?
All U.S. citizens and resident aliens must file a U.S. individual income tax return, even if they permanently live outside the United States and may not owe any tax because of income exclusion or tax credit.
Can I Mail My Return and Payment?
You can mail your tax return and payment using the postal service or approved private delivery services. A list of approved delivery services is available on IRS.gov. If you mail a return from outside the United States, the date of filing is the postmark date. However, if you mail a payment, separately or with your return, your payment is not considered received until the date of actual receipt.
Can I Electronically File My Return?
You can prepare and e-file your income tax return, in many cases for free. Participating software companies make their products available through the IRS. E-File options are listed on IRS.gov.