Tax Day 2015 takes place on April 15, 2015 in the United States. Tax Day is a colloquial term for the day on which individual income tax returns are due to the federal government. The term may also refer to the same day for states, even where the tax return due date is a different day.
Since 1955, for those living in the United States, Tax Day has typically fallen on April 15. For those filing a U.S. tax return but, living outside the United States and Puerto Rico, Tax Day has typically fallen on June 15, due to the two month automatic extension granted to filers. When April 15 falls on a Friday, tax returns are due the following Monday, and when April 15 falls on a Saturday or Sunday, tax returns are due the following Tuesday, due to the observance of Emancipation Day in Washington, D.C.
Tax returns in the United States are reports filed with the Internal Revenue Service (IRS) or with the state or local tax collection agency containing information used to calculate income tax or other taxes. Tax returns are generally prepared using forms prescribed by the IRS or other applicable taxing authority. (With material from: Wikipedia)