An employer that stops or substantially reduces contributions to a multiemployer pension plan owes withdrawal liability: its allocated share of the plan’s unfunded vested benefits, billed by the plan and paid in quarterly installments. The rules that produce that bill, the narrow ways to avoid it, and the process for challenging it are all set by ERISA, and they operate very differently from ordinary contract or tax disputes. If you contribute to a Taft-Hartley plan, the exposure follows the business, and often follows every affiliated business under common ownership.
What Counts as a Withdrawal
A withdrawal can be complete or partial, and both trigger liability.
A complete withdrawal happens when an employer permanently stops all contributions to the plan. Closing the business, exiting the industry, or terminating the collective bargaining agreement without replacing it will all do it. The clock starts the moment covered operations end.1Pension Benefit Guaranty Corporation. Withdrawal Liability
A partial withdrawal is easier to trigger accidentally. There are two paths. The first is a 70% contribution decline: if your contribution base units (usually hours worked) drop to 30% or less of your historical high over a three-year testing period, the decline itself counts as a partial withdrawal. The historical high is the average of your two highest years within the five years before the testing period began.2Office of the Law Revision Counsel. 29 USC 1385 – Partial Withdrawals
The second path is a partial cessation of the contribution obligation: permanently stopping contributions under one bargaining agreement while continuing the same kind of work, or stopping contributions for one facility while continuing similar work at another location.2Office of the Law Revision Counsel. 29 USC 1385 – Partial Withdrawals Employers consolidating operations or renegotiating labor agreements sometimes stumble into a partial withdrawal without realizing it.
How the Amount Is Calculated
Withdrawal liability is the departing employer’s share of the gap between what the plan has promised participants and what it has in assets to pay them. The plan allocates that shortfall using the employer’s contribution history relative to all contributing employers. If your contributions accounted for roughly 2% of the total over the relevant period, your liability will be roughly 2% of the plan’s total unfunded vested benefits, though the specific allocation method can vary from plan to plan.
Once the number is set, the plan sends a formal notice and demand for payment. Payments come due in quarterly installments. If the amortization schedule would run longer than 20 years, the obligation is capped at 20 annual payments regardless of how much liability remains unpaid at the end.3Office of the Law Revision Counsel. 29 USC 1399 – Notice, Collection, Etc., of Withdrawal Liability Interest accrues on any late payment from its due date.
Federal law provides a few forms of relief.1Pension Benefit Guaranty Corporation. Withdrawal Liability A de minimis reduction eliminates small liabilities by reducing the assessed amount by the lesser of $50,000 or 0.75% of the plan’s total unfunded vested benefits. The 20-year payment cap functions as its own ceiling. Some plans also adopt a “free look” provision, which lets a newly participating employer withdraw within a limited initial window without incurring any liability.
Disputing an Assessment
You do not go to court first. Federal law channels withdrawal liability disputes into arbitration, with specific deadlines for initiating the process. Miss those deadlines or fail to participate and you can forfeit the right to challenge the assessment at all.4eCFR. 29 CFR Part 4221 – Arbitration of Disputes in Multiemployer Plans
The rule that trips up employers most often is this: you must start making payments on the plan’s schedule while the dispute is pending. Withholding payment until arbitration produces a ruling is not an option. The statute takes a pay-now-argue-later approach, and if you win in arbitration, amounts you overpaid are refunded.
Construction and Entertainment Industry Exceptions
Two industries operate under modified rules that recognize the project-based nature of the work. Without them, every finished job would look like a withdrawal.
For construction industry employers, a complete withdrawal occurs only if you stop contributing to the plan and then either continue performing the same type of work in the same geographic jurisdiction or resume that work within five years without rejoining the plan.5Office of the Law Revision Counsel. 29 USC 1383 – Complete Withdrawal Genuinely exit the construction business, stay out for five years, and no liability attaches. If the plan is terminated by mass withdrawal, that look-back window drops to three years.
The entertainment industry exemption follows the same logic. Employers whose covered employees work in film, television, theater, music, radio, or related fields can stop contributing when a project ends without triggering liability, provided they don’t continue the same type of plan-covered work outside the plan.5Office of the Law Revision Counsel. 29 USC 1383 – Complete Withdrawal Both exemptions require that the plan primarily cover workers in the relevant industry and that your covered employees work substantially in that industry.
Selling the Business Without Triggering Liability
Withdrawal liability shapes virtually every acquisition involving a company that participates in a multiemployer plan. If the seller simply exits, the seller owes. Federal law offers a structured way out when the deal is a bona fide, arm’s-length sale of assets to an unrelated buyer.6eCFR. 29 CFR Part 4204 – Variances for Sale of Assets
Three conditions must all be met:
- The sale is arm’s-length with an unrelated purchaser, not a transfer among affiliates.
- The sale contract provides that the seller remains secondarily liable if the buyer withdraws from the plan within five years and fails to pay its own withdrawal liability.
- The buyer posts a bond or places funds in escrow for five plan years in the prescribed amount, giving the plan security against a buyer default.
The five-year tail on secondary liability is the piece that surprises sellers in deal negotiations. Even after closing, the seller’s exposure does not fully disappear for five years.
Controlled Group Exposure
All businesses under common ownership or control are treated as a single employer for withdrawal liability purposes. When one member of a controlled group withdraws, every company in the group is jointly and severally liable for the full amount.7Pension Benefit Guaranty Corporation. PBGC Opinion Letter 86-8
The rules reach parent-subsidiary chains, brother-sister companies with common ownership, and affiliated service groups. An owner with one company contributing to a multiemployer plan and several others that never participated can find all of them on the hook if the contributing company withdraws. Before any restructuring, asset sale, or wind-down of a participating business, map the full controlled group.
Surcharges While the Plan Is in Critical Status
If the plan’s actuary certifies it in critical status (often called “red zone”), contributing employers pay automatic surcharges on top of their negotiated contributions. The surcharge is 5% of the required contribution during the first critical year and 10% for each subsequent year the plan stays in critical status.8Office of the Law Revision Counsel. 29 USC 1085 – Additional Funding Rules for Multiemployer Plans The surcharges run until a new collective bargaining agreement incorporating the plan’s rehabilitation plan terms takes effect. These are separate from withdrawal liability but relevant to the same decision: what does staying in the plan cost, and what does leaving it cost.