Illinois' five major state pension systems carry roughly $144.6 billion in unfunded liabilities and a combined funded ratio of just 47% as of June 30, 2025, making them the most underfunded in the nation. A new commentary published June 26, 2026, by Reason Foundation warns that lawmakers are exploiting a narrow federal compliance issue to push through a sweeping pension benefit expansion that would cost tens of billions of dollars. The analysis examines Senate Bill 1937, the Fair Retirement and Recruitment Act, which advanced in committee in late 2025 but remains stalled after Gov. JB Pritzker stated the package needs "a lot more work."

The compliance issue centers on Tier 2 pensions—scaled-back defined-benefit plans created in 2011 for workers hired after that year. Federal law allows governments to exempt employees from Social Security taxes only if their replacement pension meets minimum benefit requirements. Illinois Tier 2 benefits feature a 2.2% pension accrual formula, final average salary based on the highest eight of the last 10 years, and a pensionable salary cap currently at $129,192 that grows by the lesser of 3% or one-half of inflation. The problem is that this salary cap lags behind Social Security's $184,500 wage base, which combined with Tier 2's longer averaging period drops the effective accrual rate below the required 1.75% threshold for three major systems. However, the IRS has never issued a ruling, audit finding, or enforcement action confirming this interpretation for Illinois Tier 2.

According to the Reason Foundation commentary, the narrow fix required would simply align the Tier 2 pensionable salary cap with the full Social Security wage base each year, which would cost roughly $5.6 to $6.2 billion in additional contributions through 2045, concentrated among the small share of higher earners who actually hit the cap—only about 6% of State Employees' Retirement System workers earn above it. Instead, the Fair Retirement and Recruitment Act bundles this necessary cap alignment with multiple enhancements that have nothing to do with federal compliance: shortening the final-average-salary period from eight of the last 10 years to six of the last 10, lowering retirement eligibility ages for unreduced benefits, and improving the automatic annual cost-of-living adjustment to a more generous 3% simple structure. The report states that actuarial costs for these add-ons project about $46 billion in additional costs through 2049 above the minimum benefit fix alone.

The commentary argues that proponents are using the safe-harbor concern as "a Trojan horse to justify a far broader, far costlier overhaul." Author Rod Crane writes that nothing in the minimum benefit framework mandates shorter averaging periods, earlier unreduced retirement, richer cost-of-living adjustments, or any of the rollbacks of 2011 pension reforms now on the table—those are discretionary policy choices. The analysis notes that a full-career Tier 2 non-Social Security worker with 30 years of service still replaces roughly 66% of final average salary, often competitive with private-sector 401(k) outcomes when paired with personal savings. The report emphasizes that the entire issue arises from the salary cap mechanism, so only high-earning employees above the cap could have a compliance problem—most Tier 2 participants aren't affected at all.

The commentary concludes that if the minimum compliance fix is genuinely needed, Illinois should enact the narrow salary-cap alignment after seeking IRS confirmation. Any additional enhancements must stand or fall on their independent merits under tests of adequacy, equity, affordability, and workforce needs—not on an unconfirmed regulatory theory. With Illinois pension systems already carrying the nation's worst funding crisis, the state can't afford to let a narrow federal concern become a blank check for benefit expansion.