Liability-driven investing (LDI) is a strategy in which a pension fund builds its portfolio to match the value and timing of its future benefit payments, so that assets and liabilities move together as interest rates change. Leveraged LDI amplifies this hedge with borrowing — which magnified margin calls during the UK's 2022 gilt crisis and forced emergency intervention.
Liability-driven investing flips the usual investment question on its head. Instead of asking "how much return can I earn?", an LDI investor asks "what do I owe, and when?" — and then builds a portfolio designed to meet those obligations whatever markets do. For defined-benefit pension funds, it is one of the most important strategies in use. It is also the strategy at the center of one of the decade's sharpest financial scares.
The problem LDI solves
A defined-benefit pension promises members specific payments stretching decades into the future. The present value of those promises — the liability — is extremely sensitive to interest rates: when long-term rates fall, the value of the liability rises sharply, and vice versa. A fund invested mainly in equities can find its assets and its liabilities moving in different directions, blowing a hole in its funding level even when markets seem calm.
LDI addresses this by making the asset side behave more like the liability side. In the words of the UK's pensions regulator, LDI is where schemes "aim to match their assets to the promise they have made to members." Typically that means holding long-dated government bonds and interest-rate derivatives whose value rises and falls in step with the liabilities, so the funding position stays stable as rates move.
How leveraged LDI works
Here is the twist that matters. Pure liability matching would tie up most of a fund's assets in low-returning bonds, leaving little to grow the portfolio. To avoid that, many schemes used leveraged LDI: derivatives and repo borrowing that deliver the same interest-rate hedge using far less cash, freeing the rest to invest in return-seeking assets like equities and credit.
The catch is collateral. Leveraged positions require the fund to post collateral to its counterparties, and to top it up when the market moves against the position. In normal conditions this is manageable. In a fast, large rate move, the collateral calls can arrive faster than a fund can raise cash — and that is exactly what happened in 2022.
The UK gilt crisis of 2022
On 23 September 2022, the UK government's "mini-budget" announced large unfunded tax cuts. Markets reacted violently: yields on UK gilts rose by over 100 basis points in four days. As gilt prices fell, the value of leveraged LDI positions fell with them and their effective leverage rose, triggering a wave of margin calls.
To meet those calls, LDI funds had to sell gilts quickly — which pushed gilt prices down further, generating still more margin calls. This self-reinforcing doom loop threatened a disorderly collapse in the gilt market and, with it, the solvency of pension hedges. On 28 September the Bank of England intervened, pledging to buy long-dated gilts to restore order. A UK parliamentary committee later concluded that leveraged LDI strategies had amplified the turmoil, and that regulators had underappreciated the liquidity risk that borrowing to boost returns could create.
The lessons
The episode reshaped how allocators think about LDI and, more broadly, about strategies that trade one risk for another:
- Liquidity buffers matter. Hedging interest-rate risk is worthless if you are forced to unwind it for lack of cash. Funds now hold larger, faster collateral buffers.
- Stress-test for speed and size. Models calibrated to gradual moves missed a 100-plus-basis-point shock in days. Tail scenarios must be both large and fast.
- Leverage has a hidden cost. The borrowing that made LDI capital-efficient also made it fragile. Lower leverage trades some efficiency for resilience.
- One risk reduced is another created. LDI lowered rate-mismatch risk but raised liquidity risk. Good governance accounts for the whole risk surface, not one dimension.
Why this matters for universal owners
The LDI crisis is a case study in systemic risk that a single fund cannot diversify away. When many large investors hold the same hedge and are forced to sell the same asset at the same time, individually prudent decisions become collectively destabilizing. For universal owners — exposed to the whole system — it is a reminder that the resilience of the market plumbing is part of their risk, and that liquidity, leverage and crowded positioning deserve as much attention as expected return.
In plain English
LDI means a pension invests so that its savings and its future pension bills rise and fall together, instead of drifting apart when interest rates move. The leveraged version borrowed to do this cheaply — and in 2022, when UK rates spiked suddenly, the borrowing forced fire-sales until the central bank stepped in.
Sources and further reading
- The Pensions Regulator (UK) — guidance on liability-driven investment and matching assets to liabilities.
- UK Parliament, Industry and Regulators Committee — findings that leveraged LDI worsened the September 2022 turmoil.
- Bank of England — September 2022 gilt-market intervention.