MPPAAMultiemployer Pension Plan Amendments Act of 1980
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The liability provisions for "withdrawal" in MPPAA is also designed to protect the PBGC, as the guarantor of an underfunding liability; and
The MPPAA provides that affiliated companies that are in a "trade or business" and are under common control are considered a single employer.
Further, many courts in MPPAA cases have accepted the Supreme Court's analysis in Groetzinger in distinguishing trades or businesses from investments.
Consequently, when the MPPAA was enacted, it required an employer withdrawing from a multiemployer pension plan to pay an amount equal to the employer's proportionate share of the plan's unfunded vested benefits.
414(c), the courts in the MPPAA cases generally have held that the term should be interpreted in light of the intentions of the Employee Retirement Income Security Act of 1974; see, e.