Thirty-year US Treasury yields hit multi-decade highs, raising concerns over global spillovers

Thirty-year United States Treasury yields reached multi-decade peaks in mid-August, returning to levels last observed before the global financial crisis. The move has prompted the United States Treasury to accelerate buybacks of long-term securities, a step that signals either an actual or perceived risk that such elevated yields could transmit stress to other markets and the real economy. Analysts are now asking whether the strain in global fixed-income markets, which began in early July, may spread to other asset classes.

The imbalance between global fixed-income supply and demand has turned unfavorable for American Treasuries. Supply remains abundant while key sources of demand are shrinking. The United States government is expected to need roughly two trillion dollars in financing during the 2026 fiscal year, which ends in September, and is projected to maintain borrowing above that level through 2028. By the end of July, the Treasury had already issued 1.8 trillion dollars in the first ten months of the fiscal year, including 432 billion dollars in July alone.

Foreign investors and central banks have reduced their purchases. Japan, the largest foreign holder of Treasuries, trimmed its holdings to 1.116 trillion dollars in June, a drop of about 209 billion dollars from its peak. China lowered its position to 633.4 billion dollars, roughly 40 percent below its 2021 level. Japanese insurers, historically a strong source of demand, have grown more cautious because of high hedging costs. At the same time, heavy issuance of investment-grade corporate bonds to finance artificial-intelligence investments may be diverting some demand away from Treasuries.

The combination of rising supply and falling demand has pushed up the term premium embedded in long-term Treasury yields, which compensates for duration and inflation risks. Estimates indicate that the term premium for 30-year Treasuries has climbed by about fifty basis points since early July, accounting for most of the recent rise in yields.

New sources of demand are emerging, however. American retirement systems, which are price-sensitive, are expected to step up purchases. Public pension funds, a six-point-nine-trillion-dollar industry, had coverage ratios near eighty percent in 2025, and their liability present values are falling as yields rise. Thirty-year yields above five percent make it easier to match assets to liabilities, and these investors do not face the hedging-cost pressures faced by Japanese institutional peers. Another growing, though slower and less price-sensitive, source of demand comes from target-date funds, a five-trillion-dollar industry that gradually shifts allocations toward safer assets such as Treasuries over time. Demand from this sector is projected to increase by roughly one hundred billion dollars in 2026.

Global central banks are buying fewer Treasuries, but this trend is unlikely to persist indefinitely. No negative growth shocks have been observed in 2026. Once the artificial-intelligence investment cycle cools—despite commentary about the Federal Reserve’s balance sheet—central banks are expected to return to dollar-denominated assets. The higher American Treasury yields primarily reflect a shift in the global supply-demand balance that has raised the premium needed to attract buyers. While part of the shift stems from rising United States budget deficits, the probability of a debt crisis remains low, consistent with well-anchored long-run inflation expectations and credit-default-swap spreads that do not signal significant concern.

NeoFeed reported the story.