A surprise increase in U.S. Treasury buybacks helped cool a global surge in long-term bond yields on Thursday, offering markets temporary relief as concerns over inflation, government debt and fiscal deficits continued to pressure borrowing costs.
The move came after the benchmark U.S. 30-year Treasury yield climbed to its highest level since 2007, contributing to higher mortgage rates and renewed concerns about the cost of financing America’s growing debt burden. The Treasury responded by doubling long-dated debt buybacks to at least $4 billion per operation, saying the program is designed to improve market liquidity.
Although the amount is small compared with the roughly $32.2 trillion Treasury market, investors viewed the decision as a sign that U.S. officials are increasingly sensitive to rising long-term interest rates.
The 30-year Treasury yield subsequently fell about nine basis points to 5.19% and remained steady during Asian trading. Japanese long-term yields also declined ahead of a closely watched 20-year government bond auction, while Australian and South Korean debt markets recorded smaller moves. German bunds and French debt futures also recovered.
J.P. Morgan analysts said the Treasury action provided immediate relief but did little to resolve the structural factors driving yields higher. Persistent fiscal deficits, elevated inflation expectations and increasing government borrowing remain major concerns for bond investors.
Global government bond markets have faced intense selling as countries increase borrowing to finance defence programs, social spending and other fiscal priorities. German 10-year and 30-year borrowing costs recently reached 15-year highs, while Japanese yields have climbed to levels not seen in roughly three decades.
The United States faces particularly strong fiscal pressure, with U.S. government debt exceeding $40 trillion, more than double its level in 2017. Pandemic-era spending, tax policies and longstanding budget imbalances have contributed to the increase.
Analysts warned that Treasury intervention may ease short-term market stress but cannot eliminate the fundamental supply-and-demand pressures pushing global bond yields higher. Investors are therefore likely to remain focused on inflation, fiscal policy and government debt issuance for signs of where long-term borrowing costs head next.


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