April 1- Required Minimum Distribtions (RMD’s) must be made to terminated vested participants who attained age 70 1/2 in or prior to 2011.
April 2- Form 1099-R, W-3 and W-2 must be filed electonically if not filed in writing prior to 2/29
April 15- Excess deferrals and allocable income refunds must be made .
April 15- Extensions on any forms must be filed.