Title 29 › Chapter 18— EMPLOYEE RETIREMENT INCOME SECURITY PROGRAM › Subchapter III— PLAN TERMINATION INSURANCE › Subtitle Subtitle E— Special Provisions for Multiemployer Plans › Part 1— employer withdrawals › § 1401
If an employer and the sponsor of a multiemployer pension plan disagree about certain plan decisions, they must use arbitration to settle it. Either side has 60 days to start arbitration. That 60‑day window starts either when the employer gets the plan’s notice or 120 days after the employer asked for the decision, whichever comes first. The agency that runs the program will set fair rules for the arbitration. If the parties do not agree who pays, the arbitrator will decide who pays the costs and may award reasonable lawyer fees. The plan sponsor’s decision is assumed correct unless the challenger proves by a preponderance of the evidence that it was unreasonable or clearly wrong. For calculations of unfunded vested benefits, the challenger must show that the actuarial assumptions or methods were unreasonable overall or that the actuary made a major error. If no arbitration is started, the plan sponsor’s payment demands are due as scheduled and the sponsor may sue to collect. After an arbitrator issues an award, a party has 30 days to ask a U.S. district court to enforce, change, or throw out the award. Arbitration awards are treated like other federal arbitration awards and can be enforced in court, and courts will presume the arbitrator’s factual findings are correct unless plainly disproved. There are special rules when the plan sponsor says a past transaction was mainly done to evade withdrawal responsibility. If the transaction happened at least 5 years before the withdrawal and before January 1, 1999, the sponsor must prove that claim by a preponderance of the evidence, and the employer does not have to pay withdrawal amounts while the dispute is pending. For transactions after December 31, 1998, and at least 5 years before the withdrawal (or 2 years for a “small employer”), an employer who wants to delay payments must tell the plan sponsor within 90 days. If the dispute is not decided within 12 months after that notice, the employer must post a bond or put money in escrow equal to the withdrawal payments due for the next 12 months. The bond must be renewed each year the dispute continues. A “small employer” means one that in the transaction year and each of the three years before it employed no more than 500 workers and was required to contribute for no more than 250.
Full Legal Text
Labor — Source: USLM XML via OLRC
Legislative History
Reference
Citation
29 U.S.C. § 1401
Title 29 — Labor
Last Updated
Apr 5, 2026
Release point: 119-73not60