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

No. 23-1209 SCOTUS · Decided Decided SCOTUS
Cert Granted: Jun 30, 2025 Argued: Jan 20, 2026 Decided: May 21, 2026
📄 Read the Opinion

Case Overview

M&K Employee Solutions v. Trustees of the IAM National Pension Fund addresses the correct 'measurement date' for calculating an employer's withdrawal liability under ERISA when withdrawing from a multiemployer pension plan. ERISA requires withdrawing employers to pay their share of unfunded vested benefits, but the statute's measurement date provisions can produce vastly different liability amounts depending on which date is used. The case turns on technical ERISA accounting rules with substantial financial stakes.

Decision

Opinion Ketanji Brown Jackson

Opinion of the Court

Ketanji Brown Jackson

The Facts

Under ERISA, an employer withdrawing from a multiemployer pension plan must pay withdrawal liability. The liability is calculated based on the plan's unfunded vested benefits (UVBs) as of a 'measurement date.' M&K disputed whether the actuarial assumptions used to calculate those UVBs had to be selected on or before the measurement date, or whether they could be selected later.

The Issue

Whether ERISA's withdrawal liability provisions require actuarial assumptions underlying the UVB calculation to be selected on or before the measurement date, or whether the plan can select them later.

M&K argued that the statute's 'as of' language requires assumptions to be set as of that date. The Trustees argued that the statute permits assumptions to be selected at any time so long as the values are calculated as of the measurement date.

The Rules

29 U.S.C. §1391 Withdrawal Liability Calculation ↗ explainer

Withdrawal liability must be calculated based on the plan's unfunded vested benefits (UVBs) 'as of' the measurement date. The statute does not set a deadline for selecting the actuarial assumptions used in that calculation.

29 U.S.C. §1393 Related Provisions ↗ explainer

Related withdrawal liability provisions do not establish a deadline for actuarial assumption selection tied to the measurement date.

The Application

Statutory 'As Of' Language

Pension withdrawal liability is technical. Employers pay based on the plan's unfunded obligations. To calculate that obligation, you need actuarial assumptions: discount rates, mortality rates, etc. The statute says the liability is based on UVBs 'as of' the measurement date. M&K read that to mean the assumptions had to be locked in as of that date. But the statute says 'as of,' not 'selected on or before.' The values are calculated as of a date; the assumptions can come later.

Flexibility in Actuarial Timing

The statute does not set a deadline for assumption selection. If Congress intended one, it would have said 'selected on or before the measurement date.' It did not. Allowing flexibility in assumption selection makes practical sense: the plan administrator may need time to gather data and finalize the calculations. The statute permits that flexibility so long as the final UVB values reflect the measurement date.

The Conclusion

**The Supreme Court held that §1391 and §1393 do not require actuarial assumptions to be selected on or before the measurement date.** Withdrawal liability calculations must be based on UVBs as of that date, but the assumptions can be selected later. The judgment was rendered for the Trustees.

The decision permits pension plans reasonable flexibility in calculating complex withdrawal obligations.

Court
FiledMay 13, 2024
Judge
CL Statusactive
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No circuit court data for this case.

Cert GrantedJun 30, 2025
Statusactive
Filed (CL)May 13, 2024
View on CourtListener →

Decision

Opinion Ketanji Brown Jackson
SCOTUS TMR-87098e0b Jul 5, 2026

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