US bond yields are experiencing a significant surge, with most, excluding the two-year note, now trading above 5%. This level is seen as a psychological threshold, traditionally disrupting global markets by attracting investors and prompting them to move away from other asset classes. This phenomenon is being described as a fundamental shift, creating a "5% world" where such high yields are the norm until market conditions dramatically change.

The global bond selloff has deepened, leading to US long-dated Treasury yields reaching their highest levels in over 20 years. The 30-year Treasury bond yield climbed to just over 5.46%, its highest since 2004, while the benchmark 10-year yield hit 5.14%, marking a 19-year high. This accelerated selloff is attributed to concerns over high energy costs, resilient economic growth, and increased government spending, all contributing to persistent inflation fears. The tech-heavy Nasdaq, despite the rising rates, recently closed at a record high, indicating underlying economic resilience.

While investors have largely absorbed the rise in yields due to robust economic growth, strong corporate profits, and significant spending driven by the AI boom, borrowing costs are nearing a point that could introduce turbulence into global financial markets and squeeze consumers. For instance, US 30-year mortgage rates have increased by a percentage point since before recent conflicts, now hovering around 7%, their highest in two years. This environment presents a challenge for bond managers, with some, like Vanguard's Arvind Narayan, advising a cautious approach, stating, "This is not the time to be a hero."

Despite efforts by US Treasury Secretary Scott Bessent to contain rising borrowing costs, such as intervening to buy the yen to prevent Japanese officials from selling Treasuries or expanding buybacks of 20- and 30-year debt, yields have continued their upward trajectory. Germany's finance agency also projects federal borrowing to hit a record €525.5 billion (US$598 billion) in 2026, driven by refinancing needs and special funds, highlighting the global challenge of increased interest payments amid surging spending demands. Hank Calenti, global markets strategist at SMBC EMEA, questions how much higher bond yields could go as Treasuries compete for investor purchases.