US Treasury yields have soared to levels not seen in decades, with the 30-year bond yield reaching 5.44% and the 10-year yield hitting 5.15%. This surge is largely attributed to robust US business activity expanding at its fastest pace in over five years, fueled by a surge in new orders. However, this economic strength is also accompanied by a significant increase in input costs for firms, especially in fuel and transport, which rose at the steepest rate in four years in September.

The strong economic data and rising input costs have heightened expectations for further interest rate hikes by the Federal Reserve. Money markets are now pricing in a two-thirds chance of another hike by both the Fed and the European Central Bank next month. Federal Reserve officials, including New York Fed boss John Williams and centrist board member Michael Barr, have indicated that more tightening may be necessary to curb inflation, with Williams suggesting another hike could be appropriate by year-end.

The bond market sell-off was further exacerbated by poor demand for a $70 billion sale of 5-year Treasury notes, which saw yields on that paper top 5% for the first time since 2007. Warnings from the OECD about rising government debt levels and the Institute of International Finance's report that global government debt servicing bills have exceeded $3.5 trillion also contributed to the sour mood. Despite the bond market's turbulence, some analysts note that corporate profits remain strong, with S&P 500 companies expected to see a 35% jump in profits in 2026.

The rising yields are impacting consumers and the federal government alike. Short-term consumer borrowing rates follow the Fed's benchmark, while longer-term loans are tied to the 10-year Treasury yield, pushing 30-year mortgage rates to around 7%, near a two-year high. Higher yields also mean a greater debt interest burden for the federal government. Analysts warn that borrowing costs may be nearing a tipping point where markets could experience significant turbulence.