The 2014 Form 1040 is due on Wednesday, April 15, 2015.
Now is the time to gather all income tax related income and expense documents for 2014.
If you owe the IRS for previous years, the IRS generall requires the timely filing of the 2014 Form 1040 for approval of an installment agreement.
If you owe the IRS for previous years, and you have not filed for some of those previous years, the IRS can audit the unfiled Forms 1040, and then prepare and assess a Subsitute for Return (SFR).
If you business taxes as well as personal income taxes, there is no benefit for filing the 2014 Form 1040 extension.
If you are required to file the 2014 corporate Form 1120, the due date is Monday, March 16, 2015.