Revenue Procedure 2016-37 sets forth modifications and changes to the IRS’ Determination Letter Program.

Document Excerpt
This revenue procedure modifies the Internal Revenue Service (IRS) Determination Letter program for qualified plans to eliminate, as of January 1, 2017, the five-year remedial amendment cycle system for individually designed plans, currently set forth in Rev. Proc. 2007-44, 2007-2 C.B. 54. Effective January 1, 2017, a sponsor of an individually designed plan will be permitted to submit a determination letter application only for initial plan qualification, for qualification upon plan termination, and in certain other circumstances, as described in section 4.03(3) of this revenue procedure.

Link
https://www.irs.gov/pub/irs-drop/rp-16-37.pdf