Military service members filing their taxes while overseas can either e-file online or have their tax return delivered to the U.S. by mail service.
Taxpayers who are residing overseas on Tax Day are allowed an automatic 2-month extension without having to file an extension request. This overseas extension allows an extra two months to file and to pay, unlike the regular 6-month October 15 extension (which is only an extension of time to file). Taxpayers residing outside the U.S. can still apply for the October extension to file if they so choose.
Remember to express all monetary amounts in U.S. dollars—if any pay was received in a foreign currency, you must convert to the U.S. equivalent on your tax return.