UK long-term borrowing costs highest since 1998 ahead of October Budget

Higher borrowing costs have added fresh pressure to Prime Minister Andy Burnham’s first Budget, as the yield on a 30‑year gilt climbed to 5.89%, the highest level since 1998. The surge in long‑term UK government borrowing rates coincided with a rise in the benchmark 10‑year gilt to its strongest since June 2008, reflecting broader global moves in interest rates. Burnham, addressing the House of Commons for the first time as prime minister, pledged “fiscal responsibility” as the cornerstone of his response to the cost‑of‑living crisis, while Chancellor John Healey warned that the tighter fiscal rules inherited from predecessor Rachel Reeves will limit the scope for new consumer‑friendly spending. The higher yields shrink the fiscal headroom available to meet those rules, forcing the government to balance defence, living‑cost support and the risk of tax increases or spending cuts.

The rise in gilt yields stems from a mix of inflation worries tied to the ongoing Iran war, competition from major technology firms for long‑term financing, and concerns over the scale of state borrowing. Analysts such as JP Morgan’s Karen Ward note that governments worldwide are turning to debt to fund spending, but face competition from tech companies raising capital for AI investments, which pushes up borrowing costs. In the UK, the higher rates not only increase the cost of servicing existing debt but also feed through to business and household borrowing, potentially dampening economic activity. The fiscal rules that cap borrowing aim to give markets clarity, yet the projected interest‑cost surge could erase up to half of the manoeuvre space forecast in March, tightening the tax‑and‑spend balance that is already strained by defence outlays and living‑cost pressures.

The tightening financial environment has prompted reactions from both domestic and international actors. Conservative leader Kemi Badenoch criticised Burnham’s growth diagnosis, arguing that increased government spending will not automatically raise prosperity. In the United States, speculation that the Federal Reserve may raise rates further rattled markets, while Japan also faces pressure to lift rates. Healey, attending a G20 finance ministers’ meeting in the United States, highlighted the UK’s rapid growth, improving productivity and the fastest borrowing‑reduction rate among major economies. Yet experts such as Kathleen Brooks of XTB warn that record debt levels and a high tax take make the current climate “not comfortable” for the new administration, as each rise in bond yields forces the UK to allocate more resources to debt‑interest payments, constraining future policy options ahead of the October 28 Budget.

⚡ Effects Interpreter