UK gilt yields hit decade high as global bond sell-off resumes

Global government bond markets experienced a renewed sell-off on Wednesday, pushing up UK borrowing costs to their highest levels since 2008. This development significantly complicates the fiscal position of Chancellor John Healey as he prepares his first budget. The yield on 10-year UK gilts rose to just below 5.3% in early trading, reflecting a broader trend of investors dumping bonds across major markets due to concerns over inflation and rising deficits.

The intensification of global inflation fears has been driven by the resumption of hostilities between the United States and Iran. The exchange of fire over the weekend has pushed up oil prices, with the Brent crude benchmark hovering near 95 dollars a barrel. These developments have increased expectations that central banks will need to raise interest rates in the coming months. Higher bond yields directly increase the cost of financing government debt, a factor that UK analysts warn has eroded a substantial portion of the government’s fiscal headroom since the start of the conflict.

Economists at Deutsche Bank estimate that the 26 billion pounds of room for manoeuvre created in the spring forecast could shrink to less than 14 billion pounds by the time of the 28 October budget. Healey will face the difficult decision of whether to restore this margin through tax increases or spending cuts, while also addressing pressure to fund higher defence spending. Chris Beauchamp, chief market analyst at IG, noted that while governments worldwide feel pressure from bond markets, the situation is particularly acute for the UK. He described the current environment as a moment where economic reform promises are meeting the reality of high debt levels and rising borrowing costs.

The sell-off in UK markets followed sharp declines in Asian equity markets. The Nikkei 225 index in Tokyo fell by 2.85%, while China’s CSI 300 lost 1.4% and South Korea’s Kospi dropped by 3.3%. Investor sentiment has also been affected by recent US administration attempts to intervene in financial markets, including efforts to support the yen and buy back US treasuries to rein in yields. Neither of these measures appears to have been successful in stabilising the markets.