If you have a financial interest in or signature authority over a foreign financial account (includes bank accounts, brokerage accounts, mutual funds, trusts, or pension accounts) exceeding $10,000 in aggregate during the year you are required to file an FBAR.
The FBAR is an annual report, due April 15 following the calendar year reported.
You’re allowed an automatic extension to October 15 if you fail to meet the FBAR annual due date of April 15. You don’t need to request an extension to file the FBAR.
How to File
You must file the FBAR electronically through the Financial Crimes Enforcement Network's BSA E-Filing System. You don't file the FBAR with your federal tax return. If you want to paper-file your FBAR, you must call FinCEN's Regulatory Helpline to request an exemption from e-filing.