Global Bond Yields Hit Decades Highs Amid Debt Fears

Long-term government borrowing costs in the United States, Germany, and Japan reached their highest levels in decades on Tuesday. In the U.S., 30-year Treasury yields hit a 19-year high of 5.33%, driven by a $1.8 trillion deficit and massive corporate issuance to fund AI infrastructure. Meanwhile, Japan's benchmark 10-year yield approached 3%, a level not seen since the mid-1990s, amid inflation fears and expectations of a September interest rate hike.

The Bank of Japan has intervened in currency markets to stabilize the yen, which hit 40-year lows. These interventions often involve selling U.S. Treasurys, further pushing U.S. yields upward. In response, the Federal Reserve System provides a repo facility to help Japan avoid outright Treasury sales, while U.S. Treasury Secretary Scott Bessent more than doubled long-term bond repurchases to calm markets.

Market instability is further fueled by geopolitical tensions and fiscal concerns. In Japan, investors are wary of Prime Minister Sanae Takaichi's fiscal planning for the 2027 budget. In the U.S., debt nearing $40 trillion and policies under President Donald Trump have contributed to the selloff. Similar pressures are appearing in Europe, where France faces budget gridlock and the U.K. struggles with fiscal challenges. Analysts warn that these rising yields could derail the AI-led stock market rally by increasing financing costs and reducing the value of future earnings.