June 30th year-end deadlines:

HUD REAC Submissions September 30th
Charter School Submission November 1st
UFR Submissions November 15th
990/PC Due date November 15th

December 31st year-end deadlines:

HUD Submissions March 31st
MHFA Submissions March 31st

Pension Audits:

Plan audits and 5500's are final due on or before the 15th of the 10th month following the plan year.  For example, a 12/31 plan has a final due date of 10/15.