Government borrowing costs in the UK surged on Tuesday as financial markets reacted to ongoing uncertainty surrounding Prime Minister Sir Keir Starmer’s leadership and fears of increased public spending.
The effective interest rate on 10-year government borrowing briefly reached 5.13%, marking one of the highest levels seen since the 2008 global financial crisis. Analysts said investors are becoming increasingly cautious due to concerns over inflation, rising oil prices, and possible political changes in the UK.
Market pressure has intensified after oil prices moved above $100 per barrel following tensions linked to the Iran conflict. Investors fear higher energy prices could keep inflation elevated and force central banks to maintain higher interest rates for longer.
At the same time, uncertainty over the future leadership of the Labour government has added further pressure on UK financial markets. Investors are worried that a potential leadership change could result in higher public spending and increased government borrowing.
The UK’s benchmark stock index, the FTSE 100, fell by 0.5% during trading, while the British pound also weakened by 0.5% against the US dollar, trading near $1.35. Banking shares were among the biggest losers amid concerns over possible future tax changes.
Economists noted that borrowing costs have risen globally in recent weeks, but the UK has experienced sharper increases compared with several similar economies.
The government has repeatedly defended its fiscal policy, with Prime Minister Sir Keir Starmer and Chancellor Rachel Reeves stressing their commitment to strict borrowing rules aimed at maintaining market confidence.
However, some members within the Labour Party have questioned whether current budget rules are suitable for supporting long-term economic growth and investment.
According to analysts at Capital Economics, financial markets could react negatively if there is a major leadership change within the government. They warned that investors remain sensitive to any signs of weaker fiscal discipline or increased spending commitments.
Meanwhile, the yield on 30-year UK government bonds climbed to 5.80%, its highest level since 1998, reflecting broader concerns among investors about the country’s long-term debt outlook.
Government bonds, also known as gilts, are used by the UK government to raise money when public spending exceeds tax revenues. Rising bond yields mean the government faces higher costs to borrow money, increasing pressure on public finances.
Higher borrowing costs can also affect households and businesses, as government bond yields influence mortgage rates and wider lending costs across the economy.
