Plus Deutsch is German for German, henceforth the explaination on why the Pennsylvania Dutch are called that when they are really German and not Dutch. The Dutch from the Netherlands also got their ethnic name derived from the German term Deutsch as well believe it or not. If you're Dutch, then you are from Denmark.
1 Deadline for filing a 2015 personal, partnership, or calendar year estates/trusts tax returns or extension.  The return or extension must be postmarked or transmitted for e-filing by Monday, April 18, 2016 (April 19 for Maine and Massachusetts residents).
When Can I File My 2016 Taxes in 2017 and Other Key IRS Tax Return Filing, Deadline, Extension and Refund Dates. [2016-2017 Tax Season Filing Dates] The table below shows the 2017 deadlines for filing 2016 tax returns and requesting extensions. The IRS confirmed that started processing electronic tax return filings (e-File) from Monday, January 23rd 2017. Final tax returns are due by Tuesday, April 18th; unless a 6-month extension is approved.