The landscape of federal benefits litigation underwent significant shifts in April as appellate courts and the nation’s highest judicial body issued rulings that clarified the boundaries of the Employee Retirement Income Security Act of 1974. From the high-stakes world of multiemployer pension withdrawal liability to the intricate preemption battles surrounding state-level pharmacy regulations, the month’s developments provided critical guidance for plan sponsors, fiduciaries, and beneficiaries alike. These rulings underscore the continuing tension between state regulatory ambitions and the federal government’s desire for a uniform national standard for employee benefit plans. As the legal community processes these updates, the implications for corporate compliance and the long-term solvency of retirement funds remain at the forefront of the conversation.
The Supreme Court Declines Review of Multiemployer Pension Withdrawal Liability
In a move that signals stability—or perhaps stagnation—for multiemployer pension plans, the U.S. Supreme Court declined to hear a petition from a prominent regional bakery company challenging a significant withdrawal liability bill. The case centered on the Multiemployer Pension Plan Amendments Act of 1980 (MPPAA), which mandates that employers withdrawing from a multiemployer plan must pay their fair share of the plan’s unfunded vested benefits.
The bakery company had argued that the calculation used by the pension fund’s trustees was actuarially unsound and failed to account for specific market downturns that were beyond the company’s control. Specifically, the petitioner sought to challenge the "Segal Blend" method of interest rate calculation, a long-debated formula that often results in higher liability figures for withdrawing employers. By refusing to grant certiorari, the Supreme Court has effectively left the lower court’s ruling intact, which favored the pension fund.
Industry data suggests that withdrawal liability remains one of the most volatile areas of ERISA litigation. According to recent actuarial reports, the total underfunding of multiemployer plans in the United States exceeds $600 billion. The Supreme Court’s refusal to intervene means that for the foreseeable future, plan trustees retain significant discretion in how they calculate these exit fees, provided they adhere to generally accepted actuarial principles. Legal analysts noted that this outcome is a win for plan stability but a significant burden for middle-market companies looking to exit aging, underfunded union plans.
Fourth Circuit Clarifies the "Bonus Plan" Exemption
The U.S. Court of Appeals for the Fourth Circuit issued a pivotal ruling in April regarding the scope of ERISA’s coverage over corporate incentive programs. At issue was whether a specific executive bonus plan, designed to reward long-term performance, qualified as an "employee pension benefit plan" under federal law. The court held that the plan was exempt from ERISA, asserting that its primary purpose was to provide additional compensation for work performed rather than to provide retirement income or result in a deferral of income to the termination of covered employment.
This distinction is vital for employers. If a plan is governed by ERISA, it must meet rigorous standards regarding reporting, disclosure, participation, vesting, and fiduciary responsibility. If it is considered a mere "bonus plan" under Department of Labor (DOL) regulations, it is largely exempt from these requirements. The Fourth Circuit applied the "surrounding circumstances" test, noting that while some employees might choose to save their bonuses for retirement, the plan itself did not systematically defer payments until the end of a career.
The ruling provides a roadmap for HR departments and compensation committees. To avoid accidental ERISA coverage, bonus plans should be structured with clear payout dates that are not tied to retirement or termination. Following the decision, several defense-side firms issued advisories suggesting that companies review their "phantom stock" and "long-term incentive plans" (LTIPs) to ensure they do not inadvertently trigger ERISA’s complex regulatory framework.
Sixth Circuit Rules on ERISA Preemption of State Pharmacy Laws
In one of the most closely watched cases of the quarter, the Sixth Circuit Court of Appeals ruled that ERISA preempts certain Arkansas laws and regulations aimed at Pharmacy Benefit Managers (PBMs). This decision adds a new layer of complexity to the ongoing national debate over how much power states have to regulate the entities that manage prescription drug benefits for health plans.
The Arkansas legislation sought to impose strict pricing requirements on PBMs, effectively mandating that they reimburse local pharmacies at rates no lower than the pharmacies’ acquisition costs. The state argued that this was a matter of general healthcare regulation, which should fall under state police powers. However, the Sixth Circuit disagreed, finding that because the law directly dictated the administration of benefits and affected the cost structures of ERISA-governed self-insured plans, it "related to" those plans in a way that triggered federal preemption.
This ruling appears to narrow the application of the Supreme Court’s 2020 decision in Rutledge v. PCMA, which had previously given states more leeway to regulate PBMs. The Sixth Circuit’s stricter interpretation suggests that while states can regulate the "business of insurance," they cannot cross the line into regulating the internal administration of ERISA plans. Healthcare economists predict this ruling will lead to a fragmented regulatory environment, where PBMs operate under different rules depending on the circuit, potentially increasing administrative costs for national employers.
Escalation in 401(k) Excessive Fee Litigation
Beyond the appellate rulings, April saw a continued surge in "excessive fee" class actions filed in district courts across the country. These lawsuits typically allege that plan fiduciaries breached their duty of prudence by selecting high-cost investment options or failing to negotiate lower recordkeeping fees.
A notable development this month involved a settlement in a long-running case against a major technology firm. The company agreed to a multi-million dollar payout to resolve claims that its 401(k) plan relied too heavily on "retail-class" mutual fund shares when "institutional-class" shares of the same funds were available at a lower cost.
Data from ERISA litigation trackers shows that while the number of new filings remained steady in April, the "success rate" for plaintiffs at the motion to dismiss stage has increased. Judges are increasingly allowing these cases to proceed to discovery if the plaintiffs can show a plausible "meaningful benchmark" for comparison. This trend is forcing plan sponsors to conduct more frequent and documented "request for proposal" (RFP) processes for their service providers to demonstrate fiduciary due diligence.
Mental Health Parity and the Rise of NQTL Challenges
The fifth major development in April involves the increasing scrutiny of Mental Health Parity and Addiction Equity Act (MHPAEA) compliance. Several federal courts handled motions related to "non-quantitative treatment limitations" (NQTLs)—administrative hurdles like prior authorization or fail-first requirements that are applied more stringently to mental health benefits than to medical or surgical benefits.
In a representative case in the Ninth Circuit, a group of plan participants successfully argued that their insurer’s restrictive criteria for residential treatment centers violated federal parity laws. The court emphasized that ERISA plans must provide "substantially evolved" documentation showing that the processes used to develop mental health limitations are comparable to those used for medical care.
The Department of Labor has signaled that MHPAEA enforcement is a top priority for 2026. Legal experts warn that many plans are currently non-compliant because they lack the required comparative analyses. The April rulings suggest that the judiciary is prepared to back the DOL’s aggressive stance, potentially leading to a wave of re-adjudicated claims and significant administrative overhauls for health plan sponsors.
Timeline of Key April Events
- April 6: The Fourth Circuit issues its opinion on bonus plan exemptions, providing a "safe harbor" logic for incentive-based compensation.
- April 14: The Sixth Circuit delivers its ruling on Arkansas PBM regulations, setting up a potential circuit split regarding the reach of Rutledge.
- April 20: A major technology firm announces a settlement in its 401(k) excessive fee litigation, highlighting the dangers of retail-class investment options.
- April 27: The U.S. Supreme Court denies certiorari in the bakery company’s withdrawal liability case, confirming the finality of lower court decisions on actuarial methods.
- April 30: Multiple district courts move forward with MHPAEA NQTL challenges, signaling a difficult summer ahead for health plan administrators.
Broader Impact and Industry Implications
The developments of April 2026 illustrate a maturing ERISA landscape where the "low-hanging fruit" of litigation has been replaced by sophisticated challenges to plan administration and state-federal jurisdictional boundaries. For employers, the message is clear: documentation is the best defense. Whether it is the rationale behind choosing a specific interest rate for pension withdrawal or the comparative analysis of mental health benefits, courts are demanding a higher level of transparency and proactive management.
The PBM ruling in the Sixth Circuit, in particular, highlights the precarious position of national employers. If every state attempts to regulate pharmacy costs and those efforts are inconsistently preempted, the "uniformity" that ERISA was designed to provide may be at risk. This could eventually lead to a legislative push in Congress to clarify the preemption clause (Section 514) for the modern healthcare era.
Furthermore, the Supreme Court’s hands-off approach to withdrawal liability ensures that the financial burden of the nation’s underfunded pension systems will continue to fall on the shoulders of the remaining participating employers. As more companies seek to transition to defined contribution models (like 401(k)s), the costs of exiting defined benefit plans will likely remain a significant barrier to corporate restructuring.
In summary, April’s litigation serves as a reminder that ERISA is not a static statute but a living framework that evolves through judicial interpretation. Plan sponsors and fiduciaries must remain vigilant, as the costs of non-compliance—whether in the form of litigation settlements or administrative penalties—continue to rise. The focus now shifts to May, where several pending decisions regarding environmental, social, and governance (ESG) factors in retirement investing are expected to further redefine fiduciary duty in the 21st century.
