As Chancellor Rachel Reeves gears up for the autumn budget, attention is inevitably turning to the gilt market. Yields on the 10-year and 30-year UK government bonds currently sit at 4.75% and just over 5.64%, respectively. Levels that are certainly high enough to make pension funds sit up and take notice. While no one is predicting a repeat of a Liz Truss-style 2022 gilt crisis, these yields show that pension funds cannot afford to be underprepared when it comes to margin and liquidity management.
The risk is subtle, but significant. If long-dated gilt yields move abruptly, derivatives based on these bonds may require additional collateral, in the form of a variation margin call, to cover paper losses if the current market value of their positions drop. When funds are overexposed to gilts, the required cash can escalate quickly, and raising it often involves selling gilts or other assets into a falling market, further driving prices down and yields up. This specific funding challenge should be fresh in the minds of fund managers who hold gilts. Unlike more obvious market risks, margin shortfalls can quickly spiral out of control. Pension funds typically need two to three days to liquidate assets to meet these requirements. In fast-moving markets, this delay can create a liquidity crunch, forcing sales that exacerbate market volatility. When yields are at the levels they are now, even modest shifts can generate hefty cash demands. The scale of these obligations means that any underestimation of margin could have serious consequences for solvency if a similar event was to occur this autumn.
There is no doubt the upcoming budget adds a new layer of uncertainty. Reeves has yet to specify exactly where spending cuts might fall, and fiscal plans inevitably influence gilt yields. Even without a repeat of the disastrous Kwasi Kwarteng mini budget, the anticipation of spending decisions, particularly the lack of substantial cuts, are likely to spook markets. Pension funds therefore should not rely on the Bank of England stepping in as a backstop. Liquidity and margin preparation must be proactive, not reactive.
This is not about predicting another crisis, it is about understanding structural risk. Pension funds need a far more sophisticated approach to manage margin calls. That means accurately projecting collateral requirements under a range of yield scenarios, enhancing asset liquidity, and ensuring that cash is available at the right time to meet obligations without triggering forced sales. It also means evaluating directional and long-dated strategies with pre and post-trade optimisation front of mind to reduce funding costs.
Today’s elevated yields remind us that pension funds operate a delicate balancing act. Large exposure to long-dated gilts without sufficient margin preparedness is a vulnerability that can compound quickly. By building greater sophistication into their margin and liquidity frameworks now, pension funds can protect end-investors from outsized losses and avoid a repeat of painful funding spirals. The upcoming budget may not be a crisis in itself, but it is a timely reminder that highly sophisticated risk management, not reliance on central bankers stepping in to the rescue again, should govern pension fund strategies in the debt markets.
