Key facts
- UK 10-year gilt yields reached nearly 5.3%, the highest since mid-2008.
- Global bond sell-off intensified due to US-Iran tensions and inflation fears.
- The IMF expressed concern over rising global borrowing costs.
- Higher borrowing costs could cost the UK government an additional £6 billion in debt interest payments.
- The government's fiscal headroom may be significantly reduced ahead of the October budget.
UK borrowing costs have surged to an 18-year high as a global bond sell-off intensifies, driven by renewed US-Iran tensions that are stoking inflation fears and pushing up oil prices. The yield on 10-year UK government bonds, or gilts, climbed to just below 5.3% in early trading on Wednesday, a level not seen since mid-2008.
The International Monetary Fund (IMF) has expressed concern over the rising global borrowing costs, warning that persistent risks and uncertainty necessitate policy discipline. The situation is particularly acute for the UK, where Chancellor John Healey faces pressure ahead of his first budget on October 28. Analysts estimate that increased gilt yields could cost the government an additional £6 billion in debt interest payments, potentially reducing the fiscal headroom created by Rachel Reeves to less than £14 billion.
Economists at Deutsche Bank suggest Healey may need to implement tax increases or spending cuts to rebuild the margin for error. The global sell-off has also impacted Asian markets, with Tokyo's Nikkei 225, China's CSI 300, and South Korea's Kospi all experiencing sharp declines. Investors are also reacting to US administration efforts to influence financial markets, including supporting the yen and buying back US Treasuries, which have so far proven unsuccessful.