Protection.
(6) Protection. The plan must specifically provide that the social security supplement is treated as an early retirement benefit that is protected under section 411(d)(6) (other than for purposes of sections 401(a)(11) and 417). Thus, the accrued social security supplement must continue to be payable notwithstanding subsequent amendment of the plan (including the plan's termination), and an employee may meet the eligibility requirements for the social security supplement after plan termination.