US citizens and resident living overseas who are eligible for an automatic two-month extension after the regular April 15 tax filing date must file their 2013 federal income tax returns by June 16.

Since 15 June is Sunday this year taxpayers get one additional day to submit their return. Overseas taxpayers can now use IRS free file to prepare and electronically submit their returns. An extension will applicable for taxpayers who cannot meet the June 16 deadline. But IRS warns that this is an extension of time to file, not an extension of time to pay. Three percent interest per year compounded daily applies to any payment made after 15, 2014. In some cases, a late payment penalty generally 0.5 % of the sum per month applies to payments made after June 16.

Free file to request tax-filing extension to October 15 can be used by the overseas taxpayers ignoring their income or they can download and file Form4868, available on the IRS website.