Whenever a regular tax filing date falls on a Saturday, Sunday, or a legal observed holiday in the District of Columbia, the due date for returns is pushed to the next business day.  In 2018, several due dates will be adjusted because of this rule: the Individual and FBAR due date; the C Corporation due date; the Form 1041 due date and extended due date; and the Partnership extended due date.

For calendar year tax returns reporting 2017 information that are due in 2018, the following due dates will apply.

Form 2018 Filing Due Date (Tax Year 2017)
Form W-2 (electronic or mail) January 31st
Form 1099 January 31st
Form 1065 – Partnerships March 15th
Form 1120S – S Corporations March 15th
Form 1040 – Individuals April 17th
FinCEN 114 – FBAR (will be allowed to extend) April 17th
Form 1041 – Trusts and Estates April 17th
Form 1120 – C Corporations April 17th
Form 990 Series – Tax Exempt Org May 15th
Form 1065 Extended Return September 17th
Form 1120S Extended Return September 17th
Form Extended Due Dates
Form 1041 Extended Return October 1st
Form 1120 Extended Return October 15th
Form 1040 Extended Return October 15th
FinCEN 114 (Extended with Form 1040) October 15th
Form 990 Series Extended Return November 15th