TAX DAY TRIVIA: Tax Day was moved to March 15 in 1918 and then again to April 15 in 1955. The official reason for the pushback was to spread the workload of IRS employees, but some economists speculate that a later filing date means the government can wait even longer to pay refunds. [SOURCE: http://money.cnn.com/magazines/fortune/fortune_archive/2002/04/15/321414/index.htm ]