For IRS Federal 1040, the deadline for 2015 tax year is 4-18-2016.  What is the deadline for Puerto Rico and how to file an extension for the PR return?
This year, the US FEDERAL tax deadline falls on April 18, 2016. That's the deadline to file personal tax returns (such as Form 1040) with the Internal Revenue Service. Normally, the deadline is April 15th. But this year, April 15th is Emancipation Day, a legal holiday in the District of Columbia. Under a special rule, whenever the tax deadline falls on a Saturday, Sunday or a legal holiday, the tax deadline is moved to the next business day, which this year is Monday, April 18, 2016. (That special rule, by the way, is section 7503 of the Internal Revenue Code.)