Britain is facing rising borrowing costs at a level not seen in nearly two decades, driven by a combination of domestic and global factors that pose significant challenges for Chancellor John Healey as he prepares his first budget.

A primary driver behind the increase in borrowing costs is elevated inflation. Earlier this year, market expectations were for inflation to decline to the Bank of England’s 2 percent target, which would have supported stable or lower interest rates. However, inflation forecasts have since been revised upward to as much as 4 percent, partly influenced by heightened geopolitical tensions, including the war in Iran. In response, the Bank of England is expected to raise interest rates in line with other major central banks aiming to curb inflation. Higher interest rates increase the cost to the government when issuing new debt, as investors seek greater returns to offset the erosion of purchasing power caused by inflation.

Beyond inflation, structural shifts in global financial markets are also contributing to the pressure on UK borrowing. Historically, Western governments, including the UK, benefited from lower borrowing costs by being perceived as safe havens for investors. Over the past decade, however, this has changed as public debt has surged across many countries. The UK’s government debt has grown from £1.6 trillion, representing 83 percent of GDP ten years ago, to nearly £3 trillion, or 94 percent of GDP today. Similar trends are evident in other advanced economies.

Much of this debt accumulation is attributed to external shocks, including the COVID-19 pandemic and energy crises, raising concerns among markets about governments’ ability to manage and service their debt. In the UK, debt servicing costs have become one of the largest government expenditures, exceeding £100 billion annually and ranking just behind the National Health Service in terms of government spending. Heightened risk perceptions mean investors demand higher yields to hold government bonds, further increasing the cost to the Treasury.

Compounding the situation, increased competition for global capital has emerged, driven by technological advances such as the artificial intelligence boom and the need to fund infrastructure projects like data centers. Unlike many European countries, the UK does not benefit from being part of the Eurozone, which limits currency flexibility and market confidence. Additionally, recent political instability in Britain has raised concerns about economic and policy certainty, contributing to market wariness.

Together, these factors create a complex and challenging environment for the UK government as it seeks to manage public finances amidst rising borrowing costs and global economic uncertainty.