Global borrowing costs have surged in what analysts are calling a 'perfect storm' in the bond markets, creating a challenging fiscal environment for governments, including the UK's Chancellor John Healey.
Yields on 30-year UK government bonds, known as gilts, have climbed above 5.85%, nearing 28-year highs seen earlier this year. The government recently sold benchmark ten-year gilts at a yield of up to 5.155%, the highest level since 2007. These rising borrowing costs will complicate budget planning for Healey, who is set to deliver his first Budget in October amidst increasing spending demands.
Globally, the situation is similar. Yesterday's sell-off saw yields on 30-year US Treasuries reach their highest level since 2007, exceeding 5.33%. In Japan, ten-year borrowing costs hit a three-decade high of nearly 3%. German 30-year Bund yields topped 3.78%, the highest since 2011, while French equivalent yields reached 4.91%, a high not seen since 2008.
This volatility is attributed to a confluence of factors. The oil price has spiked, reaching $91.89 a barrel, the highest this month, following stalled progress on a deal to end the war with Iran. US President Donald Trump's threat to bomb Oman if it interfered with American negotiations with Iran intensified fears that the conflict could fuel inflation. This geopolitical tension adds to existing investor worries about soaring government debt levels and uncertainties surrounding the US Federal Reserve under Chairman Kevin Warsh. Bond markets have not fully recovered from the initial impact of the Iran war, which began at the end of February.
Experts also point to a significant increase in debt issuance by artificial intelligence firms to finance their expansion plans, creating competition for investors' capital. This surge in AI-related debt, alongside rising oil prices, heavy government borrowing, and inflation concerns, has collectively pushed long-term yields to multi-decade highs across major economies, according to Axel Rudolph, chief technical analyst at trading platform IG.
In the UK, borrowing costs remain the highest among G7 nations. The government, under Prime Minister Andy Burnham, faces market jitters over its high-spending agenda, which includes a large council-house building program, social care reform, and increased defense spending. Healey faces the challenge of financing these initiatives, raising concerns about potential tax increases or further borrowing. Rising gilt yields directly increase the cost of servicing this debt.