Global bond sell-off piles new pressure on UK borrowing costs before budget

• UK 10-year gilt yields reached 5.38%, approaching the 19-year high set last week, while US 30-year Treasury yields hit 5.444%, the highest since 2004
• Bank of England Chief Economist Clare Lombardelli warned that persistently high oil prices may require interest rate increases, with the Bank expecting a 24% rise in quarterly energy price caps in January
• Higher borrowing costs have erased more than half of the £24bn fiscal buffer, likely forcing Chancellor Healey to implement tax increases or spending cuts to meet Labour's fiscal rules

Summary

Key Developments

A global bond sell-off is intensifying pressure on UK borrowing costs ahead of next month's budget. The yield on 10-year UK gilts reached 5.38% by Thursday mid-morning, approaching the 19-year high set last week. This surge significantly impacts Chancellor John Healey's fiscal flexibility.

Financial Impact

The rising yields have eliminated more than half of the £24 billion "headroom" against fiscal rules that former Chancellor Rachel Reeves had established in March's spring statement. To rebuild this buffer would require substantial tax increases or spending cuts, though Treasury sources indicate the budget will be "focused" with major spending decisions deferred to next year.

Market Context

The sell-off extends globally, with 30-year US Treasury yields hitting 5.444%—the highest since 2004. Drivers include inflation concerns linked to ongoing Middle East conflict and elevated oil prices, fears of uncontrolled US government spending, and potential competition from AI firm bond issuance.

Policy Implications

Bank of England Chief Economist Clare Lombardelli warned that persistent elevated oil prices could necessitate interest rate increases, stating: "policy is increasingly likely to need to tighten if elevated energy prices persist." Higher rates would increase mortgage costs for homeowners, conflicting with government promises of consumer relief. The Bank projects a 24% rise in the quarterly energy price cap in January if oil prices remain elevated.

Real Economy Effects

Diesel prices exemplify the pressure, reaching £2.17 per liter in Scotland, underscoring the broader cost-of-living challenges facing UK consumers.