M & K Employee Solutions v. Trustees of the IAM Pension Fund

M & K Employee Solutions is challenging how the IAM National Pension Fund calculated its withdrawal liability. This is the amount a company must pay to cover its share of promised benefits when it stops participating in a multiemployer pension plan. The Court is deciding if the fund used the correct math under federal law.

The ruling could change how much money companies owe when they leave union-backed pension plans. If the Court favors the pension fund, employers might face higher costs, but if it favors the company, the pension fund might have less money to pay retirees.

This case involves the Multiemployer Pension Plan Amendments Act, a law designed to protect workers' pensions. It addresses the technical rules for how funds manage debt when businesses exit the system to ensure the plans remain funded.

The Court heard oral arguments on January 20, 2026, where the parties debated the specific formulas used for withdrawal liability. No decision or vote count has been released yet as the justices are still deliberating.

The Supreme Court must decide if the IAM National Pension Fund used the correct legal formula to bill M & K Employee Solutions for leaving the plan.

The justices are currently deliberating and writing their opinions behind closed doors. A final decision is expected before the current term ends, likely by June or July 2026.

Withdrawal liability is a payment an employer makes when it stops contributing to a multiemployer pension plan. It ensures the company pays its fair share of the benefits promised to workers even after it leaves.

A ruling could set a nationwide standard for how these exit fees are calculated. This would provide more financial certainty for businesses planning to leave or join such plans in the future.

This federal law created the rules for withdrawal liability to prevent pension plans from going bankrupt when employers leave. The Court is interpreting whether the fund followed the specific calculation rules set by this Act.

Since the case was argued in January 2026, a written opinion is typically released a few months later. The public can expect a decision by the end of the Court's term in early summer.

The Supreme Court is reviewing the lower court's decision to see if it correctly interpreted federal pension law. The D.C. Circuit's view on the calculation method is what M & K Employee Solutions is asking the justices to overturn.