2022 UK Mini-Budget & Gilt Crisis

The UK gilt crisis was the most acute developed-market sovereign stress since the European debt crisis and the clearest example of pension fund duration risk breaking financial stability. On September 23, 2022, new UK Prime Minister Liz Truss and Chancellor Kwasi Kwarteng announced a "mini-budget" featuring £45 billion of unfunded tax cuts, the largest such package in 50 years, with no OBR fiscal forecast, no sequencing plan, and no commitment to offset spending cuts. Markets reacted violently. Sterling fell to a record low of $1.035 against the dollar on September 26, the lowest level since decimalization in 1971. UK 30Y gilt yields rose from 3.6% on September 22 to 5.1% on September 28, a 150 basis point move in four trading days. This rate shock was larger than the entire 2022 hiking cycle for long-duration gilts. The real crisis emerged in UK pension funds. Over a decade, UK defined-benefit pension schemes had adopted liability-driven investing (LDI) strategies, using leveraged gilt exposure to hedge the duration of their liabilities. When gilt yields spiked, LDI collateral requirements exploded. Pension funds needed to sell gilts to meet margin calls, which pushed yields higher, which increased margin calls, a classic doom loop. Some LDI funds went into forced liquidation. The entire UK pension system faced a potential solvency cascade. The Bank of England intervened decisively on September 28, announcing emergency gilt purchases "on whatever scale necessary." The BoE purchased £19.3 billion of long-dated gilts over 13 days. Truss reversed the main tax cut on October 3. Kwarteng was fired October 14. Truss resigned October 20 after 49 days, the shortest tenure of any UK Prime Minister in history. Rishi Sunak took over with a credible fiscal policy agenda. The structural lessons were global. LDI leverage was not a UK-specific phenomenon; similar hidden leverage existed in Dutch, German, and other European pension systems. Non-bank financial intermediation had grown to the scale where it could cause systemic stress without bank failures. Post-2022, UK and EU regulators tightened LDI oversight significantly. The episode reinforced that developed-market sovereigns are not immune to credibility shocks, fiscal frameworks matter, central bank backstops matter, and the composition of the bond holder base matters. The "bond vigilantes" returned definitively in 2022.