America's Municipal Bond Market Is Cracking Under the Weight of Unfunded Pensions
Published: December 12, 2025 | By Mariusz Kurylo
The $4 trillion U.S. municipal bond market — long considered one of the safest corners of fixed income, a haven for retirees and conservative investors seeking tax-exempt income — is showing cracks that professionals describe as the most serious since Puerto Rico's 2016 debt crisis. The primary fault line is not new revenue shortfalls or COVID-era budget stress; it is the slow-motion fiscal crisis of unfunded pension liabilities, a structural problem that has been building for decades and is now reaching an unavoidable reckoning as state and local governments confront the gap between what they promised workers and what they can actually deliver.
Aggregate state and local pension system liabilities, using market-based discount rates that pension reform advocates argue are more accurate than the optimistic assumptions many public funds use, exceeded $5.7 trillion in unfunded obligations by 2025, according to research from the Stanford Institute for Economic Policy Research (SIEPR) cited by Bloomberg. Even using the more generous official actuarial figures, unfunded liabilities were approximately $1.8 trillion — a figure that has grown steadily for fifteen years despite increased contribution rates, market gains during bull markets, and reform efforts in several states.
The connection to the muni bond market is direct and consequential: when a state or city's pension obligations are structurally unaffordable, they crowd out all other spending. Infrastructure maintenance gets deferred. Services are cut. Tax increases chase away residents and businesses. And perhaps most damagingly for muni bond investors, the fiscal room to service bond debt shrinks year by year as pension payments claim an ever-larger share of revenues. Puerto Rico, Detroit, and Stockton were not anomalies — they were previews.
The States Most at Risk
Not all states are equally exposed. The pension crisis is concentrated in a handful of states that made large promises in the 1990s and early 2000s, when pension funds were flush from the dot-com bull market and actuaries projected unrealistically high long-term returns. Illinois, New Jersey, and Kentucky stand out as the most severe cases, with funded ratios (assets as a percentage of liabilities) below 50% using market-value discount rates, according to data compiled by the Pew Charitable Trusts and cited by Reuters.
Illinois is the most closely watched. The state's five major pension funds — for teachers, state employees, university employees, judges, and legislators — collectively showed an unfunded liability of approximately $220 billion using more conservative actuarial assumptions, according to an Illinois Commission on Government Forecasting and Accountability report summarized by Bond Buyer. Required pension contributions consume approximately 25% of Illinois's general fund, crowding out education spending, social services, and infrastructure. Several major Illinois cities, including Springfield and Peoria, carry pension-adjusted credit ratings that place them firmly in junk territory.
New Jersey's situation was described by the Financial Times as "mathematically precarious." The state has chronically underfunded its pension systems for decades under governors of both parties, resulting in a pension funding shortfall that requires contributions equal to roughly 20% of state revenues simply to prevent further deterioration. New Jersey carries one of the highest combined tax burdens in the nation — partly a consequence of pension-driven fiscal pressure — while still facing credit rating pressure from Moody's and S&P.
How Pension Stress Affects Muni Bond Ratings
The connection between pension underfunding and muni bond creditworthiness is increasingly explicit in rating agency methodologies. Moody's and S&P both incorporate adjusted pension liabilities into their state and local government credit analysis, treating unfunded pension obligations as debt-like obligations that increase the total leverage of an issuer, according to rating methodology documents analyzed by Bloomberg.
For investors holding muni bonds from states like Illinois and New Jersey, this means that ostensibly "general obligation" bonds — backed by the full faith and credit of the state — carry more risk than their general obligation label implies, because that faith and credit is stretched thin by prior pension commitments. Bond Buyer reported that Illinois general obligation bonds were trading at yields 80–100 basis points above similarly-rated bonds from states with stronger fiscal positions, a spread that reflected the market's implicit pension risk premium even before official ratings reflected it.
Several smaller municipalities have experienced actual downgrades that were explicitly pension-driven. Moody's downgraded the City of Harvey, Illinois to Caa1 (deep junk) citing pension contribution arrears. The city of Bridgeport, Connecticut faced a downgrade cycle driven primarily by its pension deficit. These were smaller issuers, but the pattern was noteworthy: pension obligations were beginning to drive muni credit quality in ways that bond investors needed to understand.
Puerto Rico as the Warning That Wasn't Heeded
Puerto Rico's debt crisis, which began formally in 2015 and resulted in the largest government bankruptcy in U.S. history ($73 billion in debt), offered a clear case study in how pension obligations and bond debt can interact catastrophically. Puerto Rico's pension system was essentially insolvent — funded at less than 2% of its obligations — and annual pension payments were consuming an enormous share of revenues that was simply incompatible with also servicing bond debt.
The resolution of Puerto Rico's bankruptcy, after years of litigation and the establishment of a Federal Oversight and Management Board, ultimately resulted in significant losses for general obligation bondholders — a deeply unusual outcome in a market where GO bonds have historically been considered nearly immune to default. Wall Street Journal analysis of the Puerto Rico settlement showed that GO bondholders recovered between 65–80 cents on the dollar, depending on the bond series — a haircut that shocked the muni market's complacency about the "full faith and credit" pledge.
The lesson Puerto Rico offered — that pension obligations could effectively take priority over bond debt in a fiscally stressed jurisdiction, despite the formal legal priority of GO bonds — was not fully internalized by the muni market. A decade later, several continental U.S. states and cities were displaying the same structural characteristics that had preceded Puerto Rico's collapse.
What Retail Investors Holding Muni Funds May Not Know
The municipal bond market is heavily owned by retail investors, primarily through muni mutual funds and ETFs that offer federal tax-exempt income. For investors in high tax brackets, this tax exemption makes muni yields equivalent to substantially higher taxable yields, making the asset class particularly attractive for wealthy retirees and high earners. The retail orientation of the muni market means that credit deterioration can produce violent selling episodes: unlike institutional credit markets dominated by sophisticated professionals, muni funds can face sharp retail redemption pressure during stress events, forcing fund managers to sell bonds at distressed prices regardless of underlying credit quality.
Bloomberg analysis of retail muni fund flows in 2024 showed several episodes of significant outflows triggered by pension news coverage, demonstrating the market's sensitivity to retail sentiment. Reuters noted that the 2022 rate-driven muni selloff — during which muni funds lost value not because of credit concerns but because of rising interest rates — had already shaken retail confidence in what many investors had viewed as a "safe" holding.
For advisors recommending muni bonds to clients, the message from the fall of 2025 credit market environment was one of required diligence: not all municipalities are created equal, not all general obligation bonds deserve the deference historically accorded them, and the pension-driven fiscal stress building in a subset of states and cities represents a credit risk that cannot be evaluated purely by looking at yield spreads or historical ratings.
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Sources: Bloomberg, Reuters, The Wall Street Journal, Financial Times, CNBC, Bond Buyer
Disclaimer: This article is for informational and educational purposes only. It does not constitute financial, legal, or investment advice.