Global Bond Sell-Off Pushes US and UK Borrowing Costs Higher

In late August and early September 2026, a global bond sell-off pushed up government borrowing costs in the United States and United Kingdom. The yield on the U.S. 10-year Treasury note rose to 4.79%, its highest level since January 2025, according to reporting published around September 1-2. Separately, the yield on UK 10-year government bonds (gilts) jumped to just below 5.3% in early trading on September 2, marking its highest level since mid-2008. Multiple reports linked the rise in borrowing costs to inflation fears, with some coverage specifically citing surging oil prices and heightened U.S.-Iran tensions as contributing factors. Reporting explained that rising bond yields have broad economic effects, influencing interest rates on mortgages, auto loans, student loans, and savings accounts for consumers. In the UK, the increase in gilt yields was reported to add to the challenges facing Chancellor John Healey as he prepares his first budget. Coverage from the Associated Press, The New York Times, CBS News, BBC News, and The Guardian collectively addressed the causes and consumer-facing consequences of the yield increases, though individual outlets varied in which specific drivers and downstream effects they emphasized. As of the reporting period, the bond sell-off was described as ongoing or having resumed, with yields at multi-year or multi-decade highs in both countries. The precise weighting of contributing factors—such as the relative roles of inflation expectations, oil price movements, and geopolitical tensions—was not uniformly detailed across sources and remains a point of differing emphasis. Specific next steps, including any policy response from central banks or the UK budget's contents, were not detailed in the available reporting.