Deadline for nonprofit organizations to file information returns (Form 990) for the year 2017.

NOTE: The IRS will automatically grant a 6-month extension for 990 filings, upon timely submission of such request.  Accordingly, for organizations with a calendar fiscal year that seek such extension by the initial due date of May 15, their filing deadline will effectively change to November 15.

Deadline for Indiana personal property tax returns to be filed.