Your personal income taxes are always due on April 15, unless the 15th falls on a holiday or weekend. If you are having trouble meeting this deadline, you can submit a short form and obtain an extension of time to file. The IRS offers the extension, regardless of your reasons for needing it. So if you simply forget about the deadline, it's irrelevant. This extension gives you an extra six months — until Oct. 15 (again, barring weekends or holidays) — to file your federal tax return.