So why is Tax Day on April 17 this year? Basically, it’s due to a combination of the 15th falling on a Sunday and a holiday unique to Washington, D.C., hitting on Monday the 16th.
The nation’s capital celebrates Emancipation Day to mark the date that President Abraham Lincoln freed slaves there in 1862. While it’s a local holiday, it affects when taxes are due.
Last year, Tax Day was even later due to similar circumstances: the 15th was on a Saturday and Emancipation Day was celebrated on Monday the 17th. So taxes last year were due April 18.