Corporate Debt Stress Signals Trouble for US Borrowers

For most of 2025 and early 2026, corporate credit markets projected an air of calm. Spreads — the premium investors demand over Treasuries to hold corporate debt — hovered near their tightest levels in two decades. Companies issued bonds at a furious pace, and investors poured money into private credit funds promising steady returns. The message from markets was clear: everything is fine.

Then, on February 28, the United States and Israel launched strikes that killed Iran's Supreme Leader, and the Strait of Hormuz — the chokepoint for 20% of global oil supply — effectively shut down. Oil surged past $100 a barrel. The 10-year Treasury yield climbed above 4.28% [1]. And the veneer of calm in corporate credit began to crack.

What is now emerging is not a single-source crisis but a triple squeeze: a geopolitical oil shock compounding a massive wave of maturing corporate debt, both arriving just as the $1.8 trillion private credit market faces its first real stress test. Together, these forces threaten to expose years of risk-taking that markets had priced as though it would never come due.

The Spread Awakening

Source: FRED / ICE BofA

Data as of Mar 13, 2026CSV

The ICE BofA US High Yield Index option-adjusted spread — the most closely watched gauge of corporate credit stress — has widened from 2.68% in late January 2026 to 3.28% as of March 13, a move of roughly 60 basis points in less than seven weeks [2]. That may sound modest in absolute terms — during the April 2025 tariff shock, the same index spiked to 4.45% — but the trajectory matters more than the level.

What's striking is how rapidly the complacency has been punctured. As recently as November 2025, the average high-yield spread sat at just 2.7%, well below its 20-year average of 4.9% [3]. Investors were effectively being paid a historically thin premium to lend to the riskiest corporate borrowers in America. Janus Henderson noted in its 2026 outlook that high-yield bonds required "increasing selectivity," a polite way of saying the market had been indiscriminate [4].

The bifurcation is now stark. BB-rated bonds — the highest-quality junk debt — have seen modest spread widening. But CCC-rated bonds, the weakest tier, have blown out considerably, reflecting what analysts at Carlyle described as a market that "demands insight, not just capital" [5]. A record $25 billion of speculative-rated software loans were trading below 80 cents on the dollar as of late January, before the Iran war even began [6].

The Maturity Wall Nobody Can Climb Over

Even without a geopolitical shock, 2026 was shaping up as a reckoning for corporate borrowers. The so-called "maturity wall" — the wave of debt coming due that must be refinanced or repaid — has been building for years, and it hits its peak now.

Debt maturities are expected to jump from nearly $2 trillion in 2024 to nearly $3 trillion in 2026 [7]. In commercial real estate alone, more than $1.5 trillion in loans reach maturity by year-end [8]. JPMorgan projects $225 billion in high-yield refinancing activity this year [9]. And roughly $580 billion of leveraged loans in the Morningstar LSTA index, plus another $625 billion in high-yield bonds, mature between 2027 and 2029 — meaning the refinancing pressure doesn't let up even after this year [10].

The core problem is an interest rate mismatch. Many of these loans were originated between 2019 and 2022, when companies locked in financing at 3% to 4%. Today, they face refinancing rates that are nearly double [8]. The federal funds rate, while down from its peak, still sits at 3.64% as of February 2026 [2], and the 10-year Treasury yield has been climbing since the Iran war began, reaching 4.28% on March 13. For heavily leveraged companies, this is the difference between solvency and distress.

Source: FRED / U.S. Treasury

Data as of Mar 13, 2026CSV

The strategy of the past two years — what the market calls "extend and pretend," where lenders agree to push back maturities rather than force defaults — has reached its limits. As BRG noted in a recent analysis, extended loans are now "crowding into the 2026 window," meaning the maturity wall has actually grown larger, not smaller, as a result of the delay tactics [7].

The Private Credit Pressure Cooker

Perhaps the most underappreciated risk sits in private credit — the $1.8 trillion shadow lending market that exploded in size after the 2008 financial crisis as traditional banks retreated from riskier lending.

PIMCO warned in early March that private debt should face a "full-blown default cycle" [11]. The headline default rate in private credit has officially remained below 2% for several years. But once selective defaults and liability management exercises — creative restructurings that technically avoid default but impose losses on lenders — are included, the "true" default rate approaches 5% [12]. UBS strategists have modeled a worst-case scenario where private credit defaults reach a staggering 15% [13].

A $162 billion "maturity wall" within private credit alone must be refinanced this year at significantly higher costs [13]. The software industry, which accounts for roughly 40% of all sponsor-backed private credit loans, has been hit hardest. This concentration risk means that any downturn in tech spending could cascade through private credit portfolios.

Investor withdrawals from private credit funds have been rising, and on March 12, global financial markets experienced what analysts described as a "multi-front shock" as emerging stress fractures in private credit collided with the Iran war's market disruption [14]. The $143 billion in leveraged loans held by business development companies (BDCs) poses particular risk, according to a March 3 Deutsche Bank report [15].

The Iran War Accelerant

The U.S.-Israeli military campaign against Iran has acted as an accelerant on what were already smoldering credit risks. The closure of the Strait of Hormuz has driven oil prices from roughly $72 per barrel on February 27 to above $106 by mid-March — an increase of more than 40% [16]. For companies already struggling with elevated borrowing costs and maturing debt, the energy shock adds another layer of cost pressure.

Morgan Stanley Research estimates that a 10% rise in oil prices increases U.S. headline consumer prices by approximately 0.35% within three months [1]. With oil up more than 40%, the inflationary impulse is substantial — and it arrives just as the Federal Reserve was expected to consider its path forward at the March 17-18 meeting. Higher inflation expectations reduce the likelihood of rate cuts, which in turn keeps borrowing costs elevated for corporate America.

The secondary effects may be even more damaging. Higher energy costs typically hit consumers with a 2-3 month delay before real consumption begins declining, and depressed consumption can persist for an additional 5-6 months [1]. For the retail and consumer products sectors — already cited by FTI Consulting's 2026 Leveraged Loan Market Survey as the industries most likely to experience distress — this is an existential threat [10].

The Bankruptcy Drumbeat

The numbers are already moving. Total bankruptcy filings rose 11% in the twelve-month period ending December 31, 2025, with business filings up 7.1% to 24,737 [17]. Commercial filings in February 2026 reached 2,666 — a 21% increase over the same month a year earlier [17].

Large-company bankruptcy filings are even more alarming. S&P Global Market Intelligence counted 717 filings among large public and private companies through November 2025, surpassing 2024's full-year total of 687 and marking the highest annual count since 2010 [18]. The collapses of Saks, New Fortress Energy, and Tricolor Holdings in late 2025 inflicted steep losses on investors, and Cornerstone Research data showed that the first half of 2025 saw "mega" bankruptcies up 81% over the long-term average [3].

S&P forecasts the U.S. speculative-grade default rate will sit at 4% by September 2026, while high-yield bond defaults are projected to rise above 4% in Q1 2026 [3]. Moody's had already flagged that U.S. corporate default risk reached 9.2% in 2025, the highest since the financial crisis [19]. And these projections were made before the full impact of the Iran war was factored in.

Interest Coverage: The Canary in the Mine

One of the most telling metrics is interest coverage — the ratio of a company's earnings to its interest payments. The average interest coverage on the US leveraged loan index after Q3 2025 was around 4.6x, well below the 6x level seen in 2022 [10]. For companies at the lower end of the credit spectrum, coverage ratios are far worse.

A Federal Reserve analysis found that under its baseline scenario, the share of "debt-at-risk" — corporate debt held by companies that may struggle to service it — would gradually increase to 28% by Q3 2026, reaching levels observed at the pandemic peak [20]. That analysis was conducted before the Iran war and its associated oil shock. With crude now 40% higher and borrowing costs rising, the actual trajectory is likely worse.

The hidden leverage problem compounds this. Moody's has flagged that Payment-In-Kind (PIK) debt and Net Asset Value (NAV) lending structures — which sit outside rated entities' balance sheets — are becoming more prevalent [10]. These instruments improve liquidity in stable markets but amplify cash flow strain during downturns, creating risk that is difficult for investors and regulators to monitor.

Who Benefits From the Wreckage

Not everyone loses in a credit downturn. Distressed debt funds have been preparing for precisely this moment. Opportunistic, special situations, and distressed debt funds have collectively raised more than $100 billion over the past two years, while the 10 largest funds currently in market are targeting nearly $50 billion more [6]. For firms like Apollo, Ares, and Oaktree, corporate distress is a buying opportunity.

But the human cost is less discussed. When companies default, workers lose jobs, suppliers go unpaid, and communities that depend on those employers suffer. The industries most exposed — retail, healthcare, education, consumer products, and chemicals — are among the largest employers in America [10]. If the maturity wall, private credit stress, and oil shock converge into a genuine credit cycle downturn, the effects will extend far beyond Wall Street.

What Comes Next

The Federal Reserve meets this week, and the market widely expects rates to hold steady. That is precisely the problem. Corporate borrowers need lower rates to refinance affordably, but the Iran-driven oil shock is pushing inflation higher, constraining the Fed's ability to cut. It is a trap with no easy exit.

The bear case for high-yield credit spreads is 600 basis points, nearly double current levels — a scenario that would make refinancing prohibitively expensive for hundreds of companies [3]. The base case of 450 basis points would still represent significant widening from today and substantially higher borrowing costs.

For now, the credit market remains in what one analyst described as "denial" — acknowledging risks at the margin while still pricing the majority of corporate debt as if the worst won't happen [21]. The maturity wall, the private credit reckoning, and the war premium on energy are no longer theoretical risks. They are unfolding simultaneously, and the question for corporate America is whether the system can absorb the shock — or whether the calm of the past two years was simply the quiet before a storm that has now arrived.