IMF warns debt and leverage could trigger disorderly rise in bond yields

The IMF bond yields warning identifies a risk that government borrowing costs could climb sharply and in a disorderly way as high debt, inflation shocks and refinancing needs put pressure on sovereign bond markets. In its latest Global Financial Stability Report, released during the IMF-World Bank annual meetings in Bangkok, the fund said the consequences could extend to wider asset valuations and collateral markets.

The IMF did not forecast that such a move would occur. It said, however, that heavy public debt burdens and rollover risk leave sovereign bond markets more exposed to fiscal and inflation shocks. The fund urged debt managers to lengthen borrowing maturities, warning that large-scale replacement of long-term debt with short-term borrowing could exacerbate rollover risk.

What would a disorderly rise in government bond yields mean?

Government bonds are securities through which states borrow from investors, promising repayment of principal and periodic interest. A bond’s yield is the return investors require, and higher expected inflation or more attractive alternatives generally mean governments must offer higher returns to borrow, according to an IMF explainer on bonds and yields.

The fund distinguishes an increase in yields driven by economic fundamentals, such as higher inflation expectations, from an excessive move aggravated by impaired market functioning. It said a sharp sovereign-yield increase could lower asset valuations through higher discount rates and reduce the value of government bonds used as collateral in financial transactions. Government-bond yields also help set prices for corporate borrowing, mortgages and derivatives, the IMF has said.

Debt is the core concern, with AI issuance and hedge funds adding strain

High sovereign debt and refinancing needs are the central vulnerability in the IMF’s assessment. The report also identified fast-growing borrowing by major cloud-computing companies as an additional pressure on investor demand. Hyperscalers’ portion of global investment-grade bond issuance rose to 10% from less than 1% since 2024, according to the IMF figures reported by CNBC.

That issuance can compete with government debt for capital, though the report did not present AI borrowing as the dominant driver of yields. The IMF also highlighted 14 publicly disclosed financing arrangements since 2023 that involved about $300 billion in equity, $650 billion in debt and $1.4 trillion in future revenue commitments. Jason Wu, an assistant director in the IMF’s monetary and capital markets department, said weak AI monetisation could simultaneously reduce the value of equity investments, complicate debt servicing and leave anticipated revenue commitments unrealised.

Leveraged hedge-fund Treasury positions could amplify market stress, the IMF said. Hedge funds held about 9% of US Treasuries in 2025, up from roughly 4% in 2022, largely through arbitraged strategies, according to Federal Reserve data cited by the fund. It said some leveraged basis trades had unwound without notable short-term funding-market pressure, while remaining leverage and overlapping holdings left the market vulnerable to a disorderly exit.

The IMF reported that liquidity had held up in the US, Europe and the UK. Japan was the exception: liquidity in its government-bond market had continued to deteriorate as yield volatility increased after the end of yield-curve control.

This story draws on original reporting from CNBC.