Why was tax day moved to April 18?

Monday, April 18 is the deadline for filing 2016 federal and state taxes this year. Usually it is April 15, but because it is Emancipation Day in Washington, DC, taxes are due on 4/18. But what time do they have to be filed by? According to eFile.com

Monday, April 18 is the deadline for filing 2016 federal and state taxes this year. Usually it is April 15, but because it is Emancipation Day in Washington, DC, taxes are due on 4/18. But what time do they have to be filed by? According to eFile.com

However, the IRS says that "estimated tax payments are due on Monday, April 18, 2016 — whether or not you're a resident of Maine or Massachusetts." (You can use Form 1040-ES to calculate estimated tax.) The discrepancy is because of where Maine and 

bracket (not your entire income). To use an example from the table: A person with an adjusted gross income of $9,226 would pay 10% tax on $9,225 and 15% tax on $1. For tax brackets that apply to tax returns due April 17, 2017, see the 2016 Tax

Even though you have a few extra days this year to file your taxes — they are due next Monday, April 18, not Friday, April 15 — some of you might be scrambling to collect all the necessary paperwork. If you need to file for an extension, here's