These proposed regulations provide guidance relating to the tax qualification of multiple employer plans (MEPs) described in section 413(e) of the Internal Revenue Code (Code). The proposed regulations would provide an exception, if certain requirements are met, to the application of the "unified plan rule" for section 413(e) MEPs in the event of a failure by one or more participating employers to take actions required of them to satisfy the requirements of section 401(a) or 408 of the Code. The regulations affect participants in MEPs, MEP sponsors and administrators, and employers maintaining MEPs.