As a U.S. citizen you are most likely required to file U.S. taxes with the IRS even if you live abroad.
For more information on paying taxes as a U.S. Citizen please see:
- The new FATCA FAQ on travel.state.gov or download the FATCA FAQ here (pdf 177 KB)
- The general Internal Revenue Services Page.
- The Foreign Account Tax Compliance Act FATCA website from the IRS.