Don't blame US bond market indigestion on AI debt binge: McGeever

But might the Treasury market tremors and corporate duration deluge be more coincidence than correlation, never mind causation? Strategists at Goldman Sachs argue that any spillover from the AI issuance flood across debt markets has been limited, even with AI-related financing now representing almost a quarter of gross investment-grade issuance. They point to the fact that average credit spreads for non-AI companies haven’t moved much in recent months and remain historically tight. It’s also important to remember that the recent sovereign debt ructions have been global. While the Fed’s actions do reverberate around the world, other country-specific factors are at play too. The rout in Japan has been particularly fierce, and has centered on domestic central bank credibility and policy issues. Looking forward, Goldman expects AI issuance over the last year – massive though it has been – to have only a marginal impact on U.S. rates. Its rule of thumb, based on the duration impact of quantitative tightening, implies broader corporate borrowing costs would rise by roughly 5 basis points. "AI’s contribution to U.S. GDP growth and its crowding out effects are smaller than often thought," they wrote last week. Instead, the uncomfortable truth may be that the major trigger for steeper U.S. borrowing costs in the last few months is Warsh, or more specifically comments he has made that appear to downplay inflation risks. His apparent reluctance to embrace interest rate hikes, with inflation above the Fed’s 2% target for five years and counting, has not gone down well. The first instance was at the European Central Bank forum in Sintra, Portugal, on July 1, and the second – and more important – was four weeks later after the Fed's policy meeting when Warsh left investors unclear about potential changes to the Fed target itself. The market reaction, particularly in the "long bond," suggests investors simply don't share Warsh's confidence – or complacency – that inflation will come down without the Fed tightening policy. Yet again, this seems to be mostly a Fed story. Big Tech may be borrowing big, but the impact on broader sovereign bond markets has – so far at least – been fairly small. As U.S. hyperscalers ramp up borrowing to fund their trillion-dollar AI buildout, corporate debt issuance is smashing records. Could this massive increase in private-sector bond supply "crowd out" demand for Treasuries, putting additional pressure on Uncle Sam? The timing is certainly lousy for Washington. This flood of private-sector debt is coming just as market doubts are deepening around new Federal Reserve Chair Kevin Warsh's inflation-fighting credentials and the federal fiscal outlook. Given the unnerving signals out of Washington, fixed-income investors who aren’t required to hold sovereign debt, particularly those needing long-term assets to match liabilities, may be increasingly open to high-quality corporate alternatives – of which there are now plenty. The scale of the corporate debt surge this year is eye-popping. From January through mid-August, U.S. corporate issuance totaled $1.68 trillion, according to the Securities Industry and Financial Markets Association (SIFMA). That's up nearly 27% from the same period last year. Issuance so far in August has already hit $153.2 billion, more than July's $147.7 billion. Meanwhile, sovereign borrowing costs have spiked sharply in recent months, with yields in the U.S., Japan and Europe all hitting multi-decade highs this week. Do these two concurrent trends mean we’re seeing crowding out in action? Not necessarily. The AI buildout clearly is reshaping the corporate debt market. True, the "high technology" sector has accounted for only 12.8% of issuance in 2026 thus far, according to SIFMA, well behind financials, the biggest borrowing sector with a 45.2% share. But AI and Big Tech borrowing is growing faster than borrowing in any other sector. Issuance in 2026 has already topped $220 billion, according to LSEG, double last year's total. Consensus forecasts expect it to rise even further next year. Much of this borrowing is long term, meaning bonds with maturities up to 20 or 30 years. In market parlance, this is known as adding "duration" supply. With higher duration comes greater interest rate risk, which could help explain why the Treasury "term premium" — the extra compensation investors demand for holding long-maturity debt rather than rolling over shorter-dated paper — is rising. Indeed, a Dallas Fed working paper published earlier this year found that the borrowing to finance AI data centers will likely lead to "significant additional duration risk to the rates market". Ben Chabot, associate professor at Northwestern University and a former Fed policy advisor, says that if the flood of corporate issuance is big enough, the bond market's clearing price is bound to rise. “Duration is duration. If more corporate duration is issued, it’s going to increase the term premium for U.S. Treasuries,” he says.

Don't blame US bond market indigestion on AI debt binge: McGeever

Goldman says spillover remains limited

Warsh and Fed policy may be the bigger driver

AI borrowing is boosting corporate bond supply

Long-duration AI debt could affect term premia

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