The Internal Revenue Service reminds U.S. citizens and resident aliens, including those with dual citizenship who have lived or worked abroad during all or part of 2013, that they may have a U.S. tax liability and a filing requirement in 2014.

The filing deadline is Monday, June 16, 2014, for U.S. citizens and resident aliens living overseas, or serving in the military outside the U.S. on the regular due date of their tax return. Eligible taxpayers get one additional day because the normal June 15 extended due date falls on Sunday this year. To use this automatic two-month extension, taxpayers must attach a statement to their return explaining which of these two situations applies.

Nonresident aliens who received income from U.S. sources in 2013 also must determine whether they have a U.S. tax obligation. The filing deadline for nonresident aliens can be April 15 or June 16 depending on sources of income.

Federal law requires U.S. citizens and resident aliens to report any worldwide income, including income from foreign trusts and foreign bank and securities accounts. In most cases, affected taxpayers need to fill out and attach Schedule B to their tax return. Certain taxpayers may also have to fill out and attach to their return Form 8938, Statement of Foreign Financial Assets.

Part III of Schedule B asks about the existence of foreign accounts, such as bank and securities accounts, and usually requires U.S. citizens to report the country in which each account is located.

Generally, U.S. citizens, resident aliens and certain nonresident aliens must report specified foreign financial assets on Form 8938 if the aggregate value of those assets exceeds certain thresholds. See the instructions for this form for details.

Separately, taxpayers with foreign accounts whose aggregate value exceeded $10,000 at any time during 2013 must file electronically with the Treasury Department a Financial Crimes Enforcement Network (FinCEN) Form 114, Report of Foreign Bank and Financial Accounts (FBAR). This form replaces TD F 90-22.1, the FBAR form used in the past. It is due to the Treasury Department by June 30, 2014, must be filed electronically and is only available online through the BSA E-Filing System website. For details regarding the FBAR requirements, see Report of Foreign Bank and Financial Accounts (FBAR

IRS Reminds Those with Foreign Assets of U.S. Tax Obligations