See paragraph (b) of § 20.6165-1 for provisions relating to the bond required in any case in which the payment of the tax attributable to a reversionary or remainder interest has been postponed under the provisions of § 20.6163-1 . For further provisions relating to bonds, see § 20.6165-1 of these regulations and the regulations under section 7101 contained in part 301 of this chapter (Regulations on Procedure and Administration).
26 C.F.R. §20.7101-1