Tax Day If you are panicking about filing your taxes, then this is your lucky year. Because of Emancipation Day, an April 16 holiday celebrated in Washington, D.C., that marks the abolition of slavery in the region, you will find yourself with a little bit of a tax extension. Because the honorable holiday occurs on a Saturday this year, it will be celebrated the Friday before. That’s right! April 15, which means three extra days for all of you last-minute filers.