U.S. 30-year Treasury yield hits 19-year high amid three worries

2026-08-18

Sell pressure on ultra-long bonds

In the U.S. Treasury market on the 17th, the yield on the 30-year bond, the longest-dated security, briefly rose to 5.31%, the highest since June 2007. The 20-year yield also briefly climbed into the 5.3% range, reaching its highest level since October 2023. Higher yields mean lower bond prices.

The 10-year yield, a benchmark for long-term borrowing costs, also rose to 4.72%, its highest closing level since July 31. By contrast, the 2-year yield has been falling since late July. The yield curve across maturities has grown steeper in a twisted pattern, reflecting so-called twist steepening.

Term premium rises

The decline in the 2-year yield reflects fading expectations that the Federal Reserve will raise rates soon. Recent producer price index data and employment figures came in below market forecasts, easing near-term inflation concerns.

By contrast, the rise in ultra-long bonds such as the 30-year reflects an increase in the term premium, the extra yield demanded for bearing long-term holding risk. Market inflation expectations remain relatively stable, while concerns over fiscal conditions and bond supply and demand are pushing up ultra-long yields.

Japanese investors and fiscal strains weigh

The first concern is cautious buying by Japanese institutional investors. Japanese buyers have been channeling funds into overseas assets in an ultra-low rate environment, but domestic long-term yields briefly rose to 2.93% on the 17th, the highest in 30 years. Taking foreign exchange hedging costs into account, Japanese government bonds have also become more attractive.

J.P. Morgan Securities said in a report dated the 17th that the relative appeal of U.S. ultra-long Treasuries after currency hedging had helped restrain U.S. long-term yields, but the dynamic is now working in reverse. Japan is the largest foreign holder of U.S. Treasuries, and even a pause in new investment or reinvestment of maturities could weigh on the market.

The second concern is worsening U.S. public finances. The fiscal deficit for fiscal 2026, from October 2025 to September 2026, had already exceeded the full-year deficit of $1.775 trillion for the previous fiscal year in the cumulative total through July. In addition to rising military spending from the prolonged conflict with Iran, social security costs and interest payments are also pressuring the budget.

Fitch Ratings said the U.S. fiscal deficit is projected to reach 7.4% of GDP in 2026 and 2027, the largest among countries with similarly high ratings. Treasury issuance will remain elevated to finance the large deficit, keeping concerns alive over increased supply of longer-dated bonds in the future.

AI funding demand adds competition

The third factor is competition between the U.S. government and technology companies for long-term funding. Corporate bond issuance in the U.S. has surged to finance investment in artificial intelligence and data centers.

Charlie McElligott of Nomura Securities America said long-dated U.S. Treasuries continue to compete with private debt offering higher yields. In his estimate, data center-related funding will reach $269 billion this year, already twice the full-year total for 2025 and running at 12 times the annual average for 2015-2024.

A test of the outlook for ultra-long bonds will come with the U.S. Treasury's 20-year bond auction scheduled for the 19th. In last week's 30-year auction, the winning yield was the highest in about 25 years, while the bid-to-cover ratio was a firm 2.39 times. The key question is whether historically high yields will draw investors back.

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