BIS Warns of a New 'Fiscal-Financial Stability Nexus'

The interplay of these factors creates what the BIS calls a 'new sovereign-financial stability nexus' . In this environment, a loss of confidence in a government's debt path can spread with alarming speed. BIS Acting Head Frank Smets warned that such repricing can tighten financial conditions rapidly, complicate monetary policy calibration, and prompt central banks to intervene in ways that may undermine market and fiscal discipline . The report also assesses liquidity in core bond markets as more fragile due to stretched asset valuations and investor complacency .

A Real-World Dress Rehearsal: The 2022 UK Gilt Crisis

The 2022 UK gilt market crisis serves as a direct, vivid real-world example of the mechanism the BIS now warns about .

• The Trigger and the Spiral: Following the 'mini-budget' on 23 September 2022, a sharp rise in gilt yields (over 100 basis points in four days) triggered forced sales by leveraged Liability Driven Investment (LDI) pension funds. This created a self-reinforcing spiral of rising yields, evaporating market liquidity, and more forced selling . Total net sales of gilts between 23 September and 14 October exceeded £36 billion .
• Central Bank Intervention: The Bank of England was forced to intervene with an emergency bond-purchase program on 28 September 2022 to break the spiral and stabilize the market .
• Parallels to the BIS Warning: The LDI crisis showed how concentrated, leveraged positions in sovereign bonds, even by non-bank institutions, can amplify a fiscal shock into a systemic event. The BIS report warns that hedge funds are now playing a similar leveraged role—but across a broader set of advanced-economy sovereign bond markets . As of November 2025, net gilt repo borrowing by hedge funds stood close to £100 billion, with over 90% of this borrowing concentrated among a small number of funds .

The Erosion of a Key Market Hedge: Shifting Bond-Equity Correlations

The BIS warning is deepened by a critical structural change: the erosion of the traditional negative correlation between bonds and equities . The IMF's Global Financial Stability Report (April 2026) notes that more frequent supply shocks have damaged this 'hedging relationship' . This means that during a period of stress, bonds may no longer provide the portfolio hedge they once did. The risk is a simultaneous deleveraging in both markets, compounding losses for leveraged investors and amplifying systemic stress .

The BIS's Prescription: A Call for Policy Discipline

The BIS report calls for urgent and coordinated action across multiple policy fronts :

• Safeguard Price Stability: Central banks must maintain a firm commitment to inflation control .
• Ensure Fiscal Sustainability: Governments must rebuild fiscal buffers and reduce borrowing to ease one of the biggest threats to global financial stability .
• Extend Regulation to Non-Banks (NBFIs): Regulation must be extended to non-bank financial institutions (NBFIs), including hedge funds, which are currently less regulated than banks . BIS General Manager Pablo Hernández de Cos previously flagged that reining in highly leveraged hedge fund bets in government bonds should be a top policy priority .
• Curb Hedge Fund Leverage: The BIS urges policymakers to implement 'congruent regulation' and introduce temporary, targeted, and easily reversible liquidity backstops to prevent disorderly deleveraging .
• Pursue Structural Reforms: Governments should pursue structural reforms to boost productivity growth and enhance economic resilience to supply shocks .
• Act Now, Not Later: The BIS emphasizes that discipline in monetary, fiscal, and regulatory policy expands the room for the others to act; delay will only make necessary adjustments more costly .