§ 4219.15 Determination of reallocation liability.

(a) General rule. In accordance with the rules in this section, the plan sponsor shall determine the amount of unfunded vested benefits to be reallocated and shall fully allocate those unfunded vested benefits among all employers liable for reallocation liability.

(b) Amount of unfunded vested benefits to be reallocated. For purposes of this section, the amount of a plan's unfunded vested benefits to be reallocated shall be the amount of the plan's unfunded vested benefits, determined as of the mass withdrawal valuation date, adjusted to exclude from plan assets the value of the plan's claims for unpaid initial withdrawal liability and unpaid redetermination liability that are deemed to be uncollectible under § 4219.12(c)(1) or (c)(2).

(c) Amount of reallocation liability. An employer's reallocation liability shall be equal to the sum of the employer's initial allocable share of the plan's unfunded vested benefits, as determined under paragraph (c)(1) of this section, plus any unassessable amounts allocated to the employer under paragraph (c)(2), limited by section 4225 of ERISA to the extent that section would have been limiting had the employer's reallocation liability been included in the employer's initial withdrawal liability. If a plan is determined to have no unfunded vested benefits to be reallocated, the reallocation liability of each liable employer shall be zero.