30-Year Treasury Yield Briefly Reaches Highest Level Since 2004

The U.S. 30-year Treasury yield briefly reached 5.5319% on September 25, 2026, its highest level since 2004 according to Reuters. Reuters later reported a yield of 5.4883%. The retreat matters because the intraday high describes a temporary market price, while the day’s comparable Treasury reading shows a smaller change.

What the daily readings show

The Treasury’s daily par-yield series put the 30-year yield at 5.49% on September 25, up from 5.47% on September 24. Treasury derives its daily figures from indicative market quotations near 3:30 p.m. They do not record the highest yield reached during trading.

Reuters reported that the 10-year yield also reached an intraday high, 5.2297%, its highest since 2007. Its Treasury daily reading moved in the other direction, falling from 5.18% on September 24 to 5.17% on September 25. The two maturities therefore did not show the same day-over-day change in Treasury’s series.

The “highest since 2004” description is Reuters’ comparison of intraday market yields. It cannot be established from a continuous Treasury 30-year par-yield series: Treasury says that series was discontinued in February 2002 and reintroduced in February 2006. That gap limits comparisons based solely on Treasury’s published daily series.

Inflation and Federal Reserve policy

The Federal Reserve raised its federal-funds target range by 0.25 percentage point on September 16, to 3.75%–4.00%. Its September projections showed a median participant assessment of 4.1% for the federal-funds rate at both year-end 2026 and year-end 2027. Those assessments describe individual expectations; they do not set future policy.

The Bureau of Labor Statistics reported that consumer prices rose 3.4% over the 12 months through August and gasoline prices rose 27.4%. These figures provide inflation and energy-price context for bond investors. The available evidence does not establish how much either contributed to the September 25 yield move.

Reuters reported that oil prices fell about 3% on September 25 as bond yields retreated from their intraday extremes. Reuters also described traders pricing in further rate increases. The Federal Reserve had made no further rate decision on September 25, and the reported trading expectations do not establish what it will decide.

Costs depend on sustained yields

Higher yields would increase the interest cost of Treasury debt issued or refinanced at those rates if the increase persists. The September 25 peak did not immediately change the cost of all outstanding government debt. Its effect on federal borrowing costs depends on yields when future debt is sold or refinanced.

Freddie Mac’s September 24 survey put the average 30-year fixed mortgage rate at 7.03%, up from 6.95% a week earlier. That measured increase preceded the Treasury-yield peak, so the survey cannot measure the peak’s effect on mortgage offers. Sustained higher long-term rates could raise financing costs for homebuyers and debt-funded projects, including capital-intensive AI infrastructure; the cited figures do not establish an effect on specific projects.