In accordance with Revenue Procedure 2016-37, the individually designed plan IRC Section 401(b) remedial amendment period for required amendments will be tied to a Required Amendment List (RA) unless guidance or legislation dictates otherwise. The RA list, published by the IRS after October 1 each year, is an annual list of the all amendments for which an individually designed plan must be amended to retain qualified status. Plan sponsors must adopt any item on the RA list by the end of the second calendar year following the year the RA list is published. Discretionary amendments are still required by the end of the plan year in which the plan amendment is operationally placed into effect. Interim amendments will no longer be required for individually designed plans.
www.irs.gov; June 29, 2016.