26 C.F.R. § 1.417(e)-1T
Restrictions and valuations of distributions from plans subject to sections 401(a)(11) and 417. (Temporary)
(a) [Reserved]
(b) Consent, etc. requirements—(1) General rule. [Reserved]
(2) Consent. [Reserved]
(c) [Reserved]
(d) For rules regarding the present value of a participant's accrued benefit and related matters, see § 1.417(e)-1(d).