Do you wish to file your federal income tax return. Firstly you need to know when to file? If you are calendar year file i.e. January Year 1 to December Year 1, you will have to file on April 15, Year 2. If you are a fiscal year filer, for example February Year 1 to January Year 2, you will have to file on May 15, Year 2. You filing date is referred to as due date. Thus April 15 and May 15 are due dates of filing return. If due date falls on Saturday, Sunday or a legal holiday, the due date is automatically delayed to the next business date. If you cannot file on due date, you can request extension of time to file. You need to fill Form 4868 by the due date to request for extension. By filing Form 4868 you will get a 6 month extension to file your return. But remember extension to file is not an extension to pay tax. You will have to pay tax on original date or return you will owe interest and may be subjected to late payment penalty.