Capital buffer kept at 2 percent as AI debt and sovereign yields rise
The Bank of England Financial Policy Committee maintained the UK countercyclical capital buffer rate at 2 percent at its September 25 meeting. The Committee noted rising interconnected vulnerabilities across sovereign debt, energy markets and rapid artificial intelligence debt issuance.
Yield highs and tech debt expansion
Geopolitical escalation pushed Brent crude above $100 per barrel and UK gas over 175 pence per therm, lifting gilt and US Treasury yields to 2008 highs.
Alongside higher energy costs, global artificial intelligence debt issuance reached $450 billion by early September 2026, exceeding total 2025 volumes, with AI hyperscalers accounting for 47 percent of sterling corporate bond issuance.
The domestic banking sector maintained resilience, reporting a return on tangible equity of 17.1 percent in the second quarter of 2026 and price-to-tangible-book ratios averaging 1.9x.
Lending to large corporates and small firms grew by 9.4 percent and 4.1 percent respectively in July.
Managing the leverage pipeline
The FPC agreed to proceed with proposed leverage ratio reforms for consultation in early 2027.
Dealer repo cash lending to non-bank financial institutions has doubled from £100 billion to £200 billion since 2023, keeping hedge fund leverage elevated.
To mitigate market vulnerabilities from potential 5 percent increases in bank leverage capacity, the Committee prioritized market-based reforms in gilt repo markets, including central clearing and minimum haircuts, alongside ongoing supervision.
Prudence on paper, vulnerability in practice
The FPC correctly identifies the fragile nexus between debt-financed tech expansion and sovereign debt.
Yet relying on repo tweaks while loosening bank leverage rules risks encouraging excessive non-bank risk-taking.
Monitoring alone will not prevent systemic spillovers once market liquidity dries up.