April 1 – Participants who turned age 72 in the prior year are required to take the first Required Minimum Distribution (RMD) by this date if they did not take the distribution in the prior year.
Sole Proprietor (Form 1040) returns are due.
Employee elective deferrals in excess of the annual limit must be refunded by this date (402(g) limit).
July 31 – Due date for all Form 5500’s (can file a Form 5558 to extend the due date to October 15).
September 15 – Extended due date for Partnership (Form 1065), C-Corporation (Form 1120) and S-Corporation (Form 1120-S) tax returns.
September 30 – Summary Annual Report (SAR) is due to plan participants for calendar year-end plans, unless the Form 5500 has been extended.
October 15 – Extended due date for Sole Proprietor (Form 1040) tax return and Form 5500.
December 1 – Safe Harbor Notices are due to plan participants for the coming plan year.
December 15 - Summary Annual Report (SAR) is due to plan participants for plans that extended the Form 5500.
December 31 – Required Minimum Distributions (RMD) are due to plan participants who are at least age 72. If not paid to the plan participant by December 31, the plan participant will have to pay a 50% penalty. (The RMD due the year a participant turns age 72 can be deferred until April 1 of the following year.)