IMF Sounds Alarm on Bond Markets as Debt, Inflation and AI Borrowing Collide

A Warning From Bangkok

The International Monetary Fund issued a stark warning Tuesday that sovereign bond yields could rise in a disorderly fashion, driven by mounting public debt, resurgent inflation, and surging borrowing by AI companies. The warning appeared in the IMF's October Global Financial Stability Report, published on the sidelines of the IMF-World Bank Annual Meetings in Bangkok, Thailand. For everyday investors, pension holders, and anyone with a mortgage, the implications are hard to ignore.

Global public debt is near its highest level since World War II and is on track to exceed 100% of GDP, according to the IMF. That staggering figure forms the backdrop for the Fund's concern — governments are borrowing more than ever, and the financial system may not absorb the strain quietly.

Three Threats Converging at Once

The IMF said that while financial markets had remained resilient, backed by solid economic growth and strong corporate earnings, three risks could trigger a sharp tightening of financial conditions: an AI-related market correction, a sharp rise in sovereign bond yields, and major cyberattacks. Of these, the bond market threat drew the most detailed analysis in the report.

The IMF cautioned that elevated debt burdens and rollover pressures leave government debt "susceptible to more frequent fiscal and inflation shocks." A sharp yield rise would mark down asset values through higher discount rates and erode the value of government bonds posted as collateral. In plain terms: when bond yields spike, the ripple effects touch everything from stock valuations to the cost of everyday lending.

Government bond yields in a number of advanced economies have already risen to highs not seen in several decades, with the IMF citing higher energy prices due to the conflict in the Middle East and expectations of tighter monetary policy by central banks in response to inflation.

The AI Factor Nobody Saw Coming

AI-sector borrowing has added a new and unexpected source of strain. The IMF said hyperscalers now account for 10% of global investment-grade bond issuance, up from under 1% in 2024, with the bulk of that debt carrying longer maturities that puts it in direct competition with government bonds for investor capital. That is a breathtaking shift in just two years.

Since 2023, 14 publicly disclosed AI "circular" deals have channeled about $300 billion of equity and $650 billion of debt into financially weaker AI firms, in exchange for $1.4 trillion of future revenue commitments. The scale of these arrangements has grown large enough to reshape capital flows across global markets — and the IMF is clearly uncomfortable with the speed of that transformation.

Hedge Funds, Japan, and What Comes Next

Hedge funds' share of U.S. Treasuries rose to about 9% in 2025 from about 4% in 2022, mostly through highly arbitraged strategies. While leveraged Treasury basis trades have partly unwound without notable pressure in repurchase markets, the leverage that remains leaves the market "susceptible to a disorderly unwind," according to the report.

Japan stands out as a particular concern. While liquidity in the U.S., Europe, and the U.K. remains stable, Japan's market has "continued to deteriorate" as yield volatility has risen since the end of yield curve control. The Fund urged debt managers to lengthen maturities, warning that rollover risk could be exacerbated by strategies that replace long-term debt with short-term borrowing on a large scale.

The IMF's report does not predict a crash — but it is methodically describing the conditions under which one becomes more likely. With debt at historic highs, inflation still a live threat, and an entirely new class of borrower competing with governments for capital, the margin for error in global bond markets is shrinking. Policymakers who dismiss this as routine caution do so at considerable risk.