Illinois' Teachers' Retirement System has less than 50 cents on hand for every dollar in promised benefits despite record taxpayer contributions, according to a 2025 report from the Illinois Policy Institute analyzing the latest actuarial data. The system's funded ratio reached 47.8% as of June 30, 2025, marking the fifth straight year of improvement but leaving it ranked the seventh-worst-funded public employee pension system in the country by research nonprofit Equable Institute.

Annual contributions to TRS have surged from roughly $3.74 billion in 2016 to $6.2 billion in 2025, growing faster than the state's "Edgar ramp" law projected. Back in 2006, the state had projected it would pay a total of $6.92 billion in 2027 for all five state pension systems combined — today taxpayers contribute nearly that amount to TRS alone, which serves Illinois public school teachers outside Chicago. As of June 30, 2024, the average TRS retiree was 74.4 years old and received $63,000 annually, while roughly 36,000 of the system's more than 133,000 benefit recipients collected at least $84,000. The system's Tier 1 portion, covering employees hired before January 1, 2011, held only 47 cents per dollar owed, while the Tier 2 portion held nearly $1.22 for every dollar in promised benefits.

The report finds that because contributions don't fully cover benefit payments, TRS relies heavily on investment earnings to make up the difference, creating significant risk for taxpayers. The system assumes its investments will earn an average annual return of 7%, but lowering that assumption by just one percentage point would raise future costs to taxpayers by $11 billion through 2045. The TRS board has repeatedly argued the state's funding plan falls short because it neither targets full funding nor requires actuarially determined contributions each year, instead relying on a back-loaded payment schedule that demands increasingly larger state contributions over time.

That dependence on investment returns and the growing gap between active workers and retirees creates long-term sustainability concerns, according to the report. Tier 2 teachers — those hired after 2011 who contribute 9% of their salaries — are effectively subsidizing Tier 1 retirees through the system's overfunded Tier 2 portion, helping finance pension obligations accumulated before they entered the workforce. Recent research suggests these pension obligations crowd out funding for teacher salaries and classroom resources. Each year the state fails to make the full actuarially determined contribution, pension debt continues to grow, increasing costs for taxpayers and consuming a larger share of state resources.

The "Edgar ramp" law requires TRS to reach a 90% funded ratio by 2045, but the report recommends potential solutions including expanding 401(k)-style plans across public pension systems and exploring constitutional reforms that would allow changes to unearned benefits. For example, replacing Tier 1's automatic, compounding 3% annual increase with simple inflation-indexed adjustments would reduce long-term liabilities. Protecting retirement security for current and future teachers depends on policymakers' willingness to address the structural factors behind the system's unfunded liabilities and the growing burden they place on taxpayers.