The Surface Transportation and Veterans Health Care Choice Improvement Act of 2015 changed the due date for filing FinCEN Form 114 (Report of Foreign Bank and Financial Accounts) to April 15 of the following calendar year, with a six-month extension to October 15 allowed. Formerly, the due date was June 30 of the following calendar year, with no extension allowed.
To implement this change smoothly, FinCEN will grant filers failing to meet the April 15 deadline an automatic extension to October 15 each year—a specific request for extension will not be required.
The announcement can be found at www.fincen.gov/news/news-releases/new-due-date-fbars-0  .
Note that the due date for FBAR filings for foreign financial accounts maintained during 2016 is 4/18/17 (same as the federal income tax due date). An automatic extension will be granted to 10/16/17 because October 15 falls on a Sunday.