If you haven’t filed your 2021 taxes yet, you have until Monday, April 18 this year, instead of the usual April 15 deadline, thanks to a locally recognized public holiday — Emancipation Day — in the District of Columbia that has IRS offices closed on Friday. The D.C. Compensated Emancipation Act of 1862 ended slavery in Washington, D.C., and is celebrated on April 16. In the way of public holidays, that means Friday is a…