Below is some valuable information from the IRS for U.S. citizens abroad looking to file their taxes by the June 15, 2010 deadline:
When to File
If you reside overseas, or are in the military on duty outside the U.S., you are allowed an automatic 2-month extension to file your return until June 15. However, any tax due must be paid by the original return due date (April 15) to avoid interest charges.
Where to File
If you are a U.S. citizen or resident alien (Green Card Holder), and you live in a foreign country or you are a non resident alien, mail your U.S. tax return to:
Department of the Treasury
Internal Revenue Service Center
Austin, TX 73301-0215
If you are unable to file your return by the due date, you can request an additional extension to October 15 by filing Form 4868 before the return due date. However, any payments made after June 15 would be subject to both interest charges and failure to pay penalties.