The cost for the UK Government to issue new debt is approaching its highest level in three decades, posing a significant challenge for Prime Minister Andy Burnham and Chancellor John Healey ahead of the upcoming Budget scheduled for October 28. Data from the Government’s Debt Management Office (DMO) shows that the average yield—or effective interest rate—on newly issued UK Government bonds, known as gilts, has climbed to levels not seen since 1998.

The average yield on gilts this year stands at approximately 3.8 percent. Specifically, 30-year gilts are yielding 5.78 percent, the highest since 1998, while 10-year gilts have a yield of 5.14 percent, a figure surpassed only a few times since that year. Rising inflation, sustained high government borrowing, political uncertainties, and recent concerns over the Iran war's impact on living costs have contributed to the increase in borrowing costs.

The volume of debt issuance has also intensified the upward pressure on yields. The DMO’s annual report indicated that planned gilt sales reached £303.7 billion in the last financial year, doubling the amount issued in 2016 and marking the second-highest total on record. The only period with higher gilt issuance was during the government’s financial response to the Covid-19 pandemic in 2020-2021.

Government debt interest payments have surged accordingly. A recent House of Commons report revealed that in 2025 and 2026, the UK spent £109 billion on debt interest, equating to about 3.6 percent of gross domestic product (GDP) and 8 percent of total public spending—levels near the highest seen in half a century.

At the same time, official figures from the Office for National Statistics (ONS) revealed a higher-than-expected rise in government borrowing in July, which reached £1.8 billion—£700 million more than the same month a year earlier. The ONS also reported a £2 billion increase in welfare spending compared to the previous year. This was in contrast to the Office for Budget Responsibility’s (OBR) forecast of a £500 million surplus, resulting in borrowing running £2.3 billion above expectations for the month. Overall borrowing for the financial year to date stands at £56.7 billion, exceeding the OBR’s target of £54.4 billion.

The fiscal outlook places Chancellor Healey in a delicate position as he seeks to adhere to the fiscal rules established by his predecessor Rachel Reeves, while the Prime Minister has introduced a series of spending measures aimed at alleviating the cost-of-living crisis since taking office this summer. The need to balance rising welfare costs, increased defence spending, and controlling government borrowing presents a significant policy challenge.

Meanwhile, inflationary pressures continue to build. Recent data from the British Retail Consortium (BRC) and NIQ showed shop price inflation at 1.5 percent over the past year, the highest increase in two years and a sharp rise from 0.9 percent in July. BRC chief executive Helen Dickinson attributed the price rises to higher energy, input, and commodity costs filtering through the supply chain, particularly affecting imported and processed ambient foods. Non-food sectors, including electrical goods, also saw price increases attributed in part to rising costs in memory chips and storage driven by ongoing advancements in artificial intelligence technology.