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Electronic Tax Filing. Personal Business Returns Payroll Service. Professional & Experienced. Notary Year Round Service. Hablamos Espanol The tax deadline in the U.S. was originally March 1 after the introduction of the 16th Amendment in 1913. It was moved to April 15 in 1955 in order to give taxpayers more time to sort out and file their returns. Therefore the first few months of the year are the busiest for tax professionals.