A long-dormant corporate credit market is stirring, and the signals it is sending are putting the Federal Reserve in a difficult position.
CoreWeave, Inc. (CRWV) bonds suffered a sharp blow this month, with yields on its 2032 notes briefly spiking to 15%, while junk-grade and investment-grade bond yields also climbed to their highest levels since 2025 and 2023 respectively. This marks the re-emergence of corporate financing costs—a key channel for transmitting monetary policy—as a drag on economic growth, an effect that had all but disappeared over the past several years.
The Fed restarted rate hikes in September. Columnist Jonathan Levin wrote in Bloomberg that while the rise in corporate credit costs is exactly the tightening effect the Fed has long hoped for, it does not mean policymakers can fully control what happens next. With the 2028 high-yield bond maturity peak approaching, disorderly widening of credit spreads could trigger a wave of mass defaults and rising unemployment, quickly eroding household wealth accumulated in recent years. Given this, the Fed should hold steady at its October meeting, keeping the rate range at 3.75% to 4% unchanged, and weigh its December decision prudently.
The corporate financing shield fades and credit transmission reactivates
Over the past several years, American companies relied on ultra-low borrowing costs locked in during the pandemic to withstand the Fed's most aggressive rate-hiking cycle since 2022, surprising investors and economists alike. At the time, a large number of companies had issued long-term bonds or refinanced loans at extremely low rates, so when the Fed began raising rates, their actual financing costs were barely affected.
According to data from the U.S. Bureau of Economic Analysis, from early 2021 to the end of 2022, companies were actually net beneficiaries of rate hike expectations—because the returns on their cash reserves thickened rapidly as rates rose, while repricing on the debt side was extremely slow. Over the following five years, net interest expenses for non-financial corporations increased by only about $86 billion, while pre-tax profits surged by roughly $1.2 trillion over the same period to about $2.7 trillion.
This situation fundamentally severed a key link in the monetary policy transmission chain—namely, curbing corporate investment and hiring by raising the cost of capital. The situation was strikingly similar to the "mortgage lock-in effect" in which 14 million households refinanced their mortgages at rates of 2% to 3%. Now, the impact of interest expenses on corporate operations is suddenly returning.
CoreWeave is an extreme case, yet it reflects broader risks
CoreWeave's business model is especially dependent on continuous access to debt market financing: repeatedly borrowing to buy AI chips and expand data centers, then leasing computing power through long-term contracts to earn returns exceeding financing costs. The premise of this model is stable access to funds at reasonable rates; once financing conditions tighten, the entire logic chain breaks down.
Last week, CoreWeave's bonds and stock price both crashed. Bloomberg reported there was no obvious single catalyst, with the main cause being broadly higher long-term Treasury yields. Market research firm Gartner Inc. released a report around the same time pointing out that AI revenue may struggle to support the current scale of data center investment, further deepening market pessimism.
The shock is spreading more widely. Borrowing costs for companies such as Oracle, Alphabet and Meta have all risen due to higher U.S. Treasury yields and investors demanding greater risk premiums. The current U.S. fiscal deficit is about 6% of GDP and is expected to remain high, leaving very limited room for a substantial decline in Treasury yields.
The 2028 maturity peak poses systemic pressure
According to the Bloomberg U.S. High Yield Bond Index, about a quarter of its constituent bonds will mature within the next one to three years, a share close to a historical high. Elevated yields will pose a severe test for issuers that need to refinance in a concentrated way around 2028, when the maturity wall is at its most daunting.
The investment-grade market has been relatively less affected. For AI projects with returns of 50%, whether investment-grade yields are 5% or 6%, the decision to proceed will not be fundamentally shaken; but for projects with uncertain profit prospects and lower returns, if high financing costs persist, related investment plans may be shelved.
Jonathan Levin noted that monetary policy has always had "long and variable lags," but this round is particularly unusual: the duration of the breakdown in the corporate credit transmission channel is rare in decades. At the same time, a massive $78 trillion increase in household net wealth and wartime-scale fiscal deficits are also continuing to buffer the impact of tightening policy on growth, making the actual effects of monetary policy even harder to predict.
Benign tightening and disorderly risk are separated by a thin line
Under new Chair Warsh, the Fed faces a delicate policy window. Moderate credit tightening could help cool the AI capital spending boom as supply gaps in semiconductors and data centers gradually close, thereby pushing inflation back to 2% after nearly six years of deviation from target without triggering systemic risk.
But if credit spreads widen in a disorderly manner, the 2028 debt maturity peak will shift from "challenging" to "unsustainable," triggering cascading defaults and rising unemployment, and quickly eroding household wealth accumulated over many years.
Which of the two scenarios will materialize remains uncertain. It is precisely this uncertainty that requires the Fed to keep rates in the 3.75% to 4% range at its October meeting and remain prudent about its December decision. The plunge in CoreWeave bonds has awakened the dormant credit market, and no one can predict how this beast will react in the coming months.
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