Since 1955, Tax day has
typically fallen on April 15. If April 15 falls on a Friday, Taxes are due the
following Monday. If April 15 falls on a Saturday or Sunday, then taxes are due
the following Tuesday due to the observance of Emancipation Day in Washington, DC. Which is why this year taxes are due on April 17.
Source: http://en.wikipedia.org/wiki/Tax_Day
