The UK government bond market, often referred to as the gilt market, has seen a substantial selloff recently, sending yields soaring and raising questions about the economic outlook. In the wake of recent fiscal policy announcements, the 10-year UK gilt yield has climbed sharply, up 25 basis points since the pre-budget period and an additional 13 basis points on Thursday alone. Unlike earlier movements that were partly influenced by global factors, such as rising U.S. yields, this latest spike in gilt yields appears largely domestic in origin, driven by concerns over increased public spending and its potential inflationary effects.

What’s Driving the Selloff?

Historically, gilt yields tend to follow the trend of U.S. Treasury yields due to the interconnected nature of global bond markets. However, recent market behavior shows a divergence, with the U.S. 10-year yield rising only 8 basis points over the last day, compared to a much sharper move in the UK. The increase in UK gilt yields is largely a response to rising expectations of inflation in the wake of the budget and associated government spending forecasts.

In particular, short-term interest rate contracts like Dec25 SONIA have surged by nearly 40 basis points this week, far outpacing their U.S. counterpart, SOFR, which saw an increase of 14 basis points over the same period. This dramatic shift suggests that market participants are recalibrating their expectations for the Bank of England’s (BoE) rate hikes, driven by concerns over inflation potentially breaching the bank’s target in the coming years.

Key Insights from David Miles of the Office for Budget Responsibility

Adding to the market’s unease, David Miles, a senior official at the Office for Budget Responsibility (OBR) and former member of the BoE’s Monetary Policy Committee, provided some candid remarks in an interview published by Market News. According to Miles, the recent budget has significantly raised expectations for public sector spending, pegged at around £70 billion more annually than previously anticipated. While some of this spending is expected to be offset by tax revenues, Miles pointed out that only about half of this additional expenditure would be recouped.

In essence, the high level of spending is likely to drive up demand in the economy, potentially outstripping productive capacity and creating inflationary pressures. Before the budget announcement, the OBR had forecasted an inflation rate close to the BoE’s target of 2%. Now, however, Miles believes inflation could linger around 2.5% over the next couple of years—a considerable deviation that could have serious implications for monetary policy.

Implications for the Bank of England’s Monetary Policy

Miles’ comments also suggest that the Bank of England may face added pressure to act if inflation exceeds expectations. The market response reflects mounting concerns that the BoE might adopt a more hawkish stance, raising interest rates to counterbalance any fiscal-induced demand increases. While a 2% inflation rate would likely keep policy settings steady, a sustained rise to 2.5% or beyond could prompt the BoE to hike rates more aggressively to prevent inflation from embedding itself in the economy.

This shift in expectations has resulted in substantial moves across the yield curve, particularly in short-term contracts. For instance, SONIA contracts from September 2025 to June 2026 are up 20 basis points in implied rate terms, nearing the kind of volatility seen at the height of the gilt market turmoil in 2022.

What’s Next for Investors?

The combination of higher yields and elevated inflation expectations could signal a rough road ahead for UK gilts. Investors are beginning to weigh the risks of holding these bonds in an environment where fiscal policy may amplify inflationary pressures, potentially leading to tighter monetary policy from the BoE. If the BoE does pivot to a more aggressive rate path, this could further weigh on bond prices, making gilts less attractive.

In the near term, markets will be watching closely for any signs from the BoE that it is reconsidering its rate hike trajectory, especially as it digests the implications of the latest budget and the OBR’s revised forecasts. For now, the gilt market selloff serves as a reminder of the complex interplay between fiscal and monetary policy—and the potential consequences when markets perceive them as out of sync.

As we look ahead, investors should brace for continued volatility in the gilt market, with the potential for further rate hikes if inflation pressures mount. While the current environment may offer opportunities for some, caution remains the watchword, as the impact of fiscal policy on inflation and growth remains uncertain.