I would add to Bev's comment that you will automatically get a 2-month extension because you are out of the country, but that still won't help for your 1-year, so you need to apply for the usual 6- month extension, and do it before April 17 (because of Emancipation Day in DC).

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Steve Odem, IRS Enrolled Agent, Australian Registered Tax Agent. steve@katax.com