The U.S. long-term Treasury market has once again sounded an alarm.
On Wednesday, Eastern Time, the U.S. Treasury Department completed an auction of $25 billion in 30-year Treasury bonds. The final awarded yield was 5.046%, marking the first time since August 2007 that the coupon rate for such bonds has reached 5%. This highlights that, against the backdrop of resurging inflation concerns and a continuously expanding fiscal deficit, investors are demanding higher returns to hold ultra-long-term U.S. debt.
The auction results were notably weak. The awarded yield for the 30-year Treasury bonds on Wednesday was significantly higher than the 4.876% yield from the previous auction in April. It also slightly exceeded the pre-issuance rate of 5.041% observed in the secondary market before the bidding deadline, creating a so-called "tail"—a signal typically interpreted by the market as weak demand. This marks the second consecutive 30-year Treasury auction where a tail has appeared.
A financial blog described this Treasury auction result as "ugly," noting it was "the first 5% yield on a 30-year Treasury auction since the quant meltdown of August 2007." It pointed out that, as veteran traders recall, the historic "quant meltdown" in August 2007 not only marked the peak of the S&P index at that time but eventually evolved into a global financial crisis.
The bid-to-cover ratio for this auction was 2.303, down from the previous 2.385. This not only fell below the average ratio of 2.43 for the past six auctions but also hit a new low since November 2025.
However, the internal structure data of the auction was not as bleak: The proportion allocated to indirect bidders, including foreign central banks and other institutions—an indicator reflecting demand from investors outside the U.S.—was 66.6%. This was higher than the 64.1% from the last auction in April and only slightly below the recent average of 66.8%. Direct bidders received 21.74%, while the remaining 11.7% was taken up by primary dealers who serve as backstops for the auction.
This auction continued the overall pressure seen in U.S. Treasury issuance this week. Previous auctions for 3-year and 10-year Treasury bonds also faced lower-than-expected demand, indicating that as yields continue to climb, investors' capacity to absorb large-scale Treasury supply is being tested.
What does it mean for the 30-year Treasury coupon to return to 5%?
According to U.S. Treasury regulations, if the awarded yield of a Treasury auction falls between 5% and 5.124%, the corresponding bond coupon is set at 5%. This means that Wednesday marked the first time since 2007 that the U.S. Treasury has issued a 30-year bond with a 5% coupon.
Media outlets noted that the last time the U.S. issued a 30-year Treasury bond with a 5% coupon was on the eve of the global financial crisis and the U.S. economic recession. For nearly two decades since then, the coupon on 30-year Treasury bonds had never exceeded 4.75%.
During the peak of the COVID-19 pandemic, Treasury yields fell to historic lows. In May 2020, a 30-year Treasury bond issued by the U.S. Treasury had a coupon of just 1.25%. Following the Federal Reserve's aggressive interest rate hikes since then, the price of 30-year Treasury bonds has now fallen to less than 50 cents on the dollar to attract buyers.
This reflects the dramatic repricing that has occurred in the global bond market over the past few years:
The Federal Reserve has cumulatively raised interest rates by over 500 basis points; The U.S. fiscal deficit continues to expand; Long-term inflation expectations are resurging; Investors are demanding a higher "term premium" for holding long-term Treasury bonds.
While the yield on 30-year Treasury bonds in the secondary market has breached 5% multiple times over the past few years, including during the Federal Reserve's aggressive tightening in October 2023, the key difference this time is that the U.S. Treasury is formally issuing long-term bonds at a 5% financing cost.
Rising energy prices fuel expectations of "higher for longer" rates
The recent sustained increase in international oil prices is considered one of the significant factors driving long-term bond yields higher again.
The market is concerned that escalating tensions in the Middle East and rising energy prices could reignite U.S. inflation, forcing the Federal Reserve to maintain high interest rates for an extended period.
Simultaneously, U.S. fiscal financing needs continue to expand rapidly.
Over the past few years, the U.S. Treasury has consistently increased the size of Treasury auctions to cover the growing fiscal deficit. Media reports indicate that when long-term bond yields first exceeded 5% in 2023, the Treasury's decision to enlarge auction sizes was also a key driver.
There is growing concern in the market that the U.S. government will need to conduct large-scale financing at high interest rates for years to come, while demand from foreign central banks and long-term capital for Treasury bonds has not grown correspondingly.
It is worth noting that demand for 20-year Treasury bonds has been consistently weaker than for 30-year bonds in recent years, resulting in generally higher yields. Since the U.S. Treasury resumed issuing 20-year bonds in 2020, their yields have mostly been higher than those of 30-year bonds. A 20-year bond issued in May of this year has also reached a 5% coupon level.
Surge in long-term bond yields triggers global asset repricing
The yield on 30-year Treasury bonds is regarded as one of the most critical long-term interest rate anchors in global financial markets.
Its sustained increase implies: further rising financing costs for U.S. corporations; renewed upward pressure on mortgage rates; continued valuation pressure on technology and growth stocks; and further tightening of global financial conditions.
Currently, the yield on U.S. 30-year Treasury bonds is approaching the cycle high, prompting the market to reassess whether "higher for longer" interest rates will become the new normal for global markets in the coming years.
Some Wall Street institutions believe that long-term Treasury yields at 5% are beginning to regain attractiveness for allocation. However, other investors worry that if the U.S. fiscal deficit, inflation, and energy prices continue to deteriorate, the long-term bond market may not have truly bottomed out yet.
Comments