PBGC Announces Proposed Rule on Interest Rate Assumptions for Multiemployer Plan Withdrawal Liability

On October 14, 2022, the Pension Benefit Guaranty Corporation (PBGC) proposed a new regulation under ERISA Section 4213(a)(2) setting forth actuarial assumptions that a multiemployer pension plan may use in calculating an employer’s withdrawal liability.

Background on Withdrawal Liability

Under ERISA § 4213(c), an employer withdrawing from a multiemployer pension plan must pay the plan its proportional share of the plan’s unfunded vested benefits, which is the difference between the present value of the plan’s nonforfeitable vested benefits and the value of the plan’s assets. The plan’s actuary must employ a variety of assumptions to calculate the withdrawing employer’s liability, such as how long employees will work and how long retirees will live (both of which affect the value of the benefits the plan must pay in the future).