The UK Gilt Crisis: How Leveraged Pension Funds Nearly Broke the Bond Market
A UK government budget announcement triggered a sharp bond selloff that exposed hidden leverage inside pension funds, forcing an emergency central bank intervention within days to prevent a broader financial spiral.
- 30-year gilt yield move
- Sharpest in decades, in days
- Bank of England response
- Emergency bond-buying program
- Time from budget to intervention
- About 3 days
What happened
In September 2022, the UK government announced a package of large, unfunded tax cuts. Markets reacted by selling UK government bonds (known as gilts) sharply, pushing yields up at a pace rarely seen in developed government bond markets, which are usually among the most stable assets in the financial system.
The speed of the move exposed a hidden vulnerability in UK pension funds, many of which used a strategy called Liability-Driven Investment (LDI), involving leveraged derivative positions to manage their long-term obligations. As gilt yields spiked, these funds faced margin calls and needed to raise cash quickly — often by selling more gilts, which pushed yields higher still, in a feedback loop threatening to spiral out of control within the space of days.
The Bank of England intervened with an emergency, temporary bond-buying program specifically to calm the gilt market and give pension funds time to reduce their leverage in an orderly way, describing the risk to broader financial stability as material. The controversial parts of the budget were reversed within weeks, and the UK Prime Minister who introduced it resigned shortly after.
Why it still matters
The gilt crisis shows that leverage risk is not confined to hedge funds or crypto exchanges — it can sit quietly inside institutions as conservative-sounding as pension funds, invisible until a fast enough move in an otherwise "safe" asset class exposes it.
It also illustrates, at the scale of an entire government bond market, the same margin-call feedback loop that shows up throughout this history at smaller scale: a leveraged position facing a margin call is often forced to sell into the very decline causing the problem, deepening it — whether that leveraged position belongs to a single trader or an entire industry.