Emancipation Day dates to April 16, 1862 when President Abraham Lincoln signed a bill ending slavery in that area. When IRS deadlines fall on a weekend or legal holiday, the due dates are moved to the next business day.
According to the IRS, at the time that tax instructions were approved for printing, the tax group believed that the April 16 date was accurate. They have since changed their mind.
Any IRS form, instruction or publication that shows April 16, 2007 as a due date is incorrect and should read April 17, 2007. This is the true 2007 tax due date.
(Image Courtesy: U.S. National Archives and Records Adminstration)