Treasury Yields Hit Their Highest Level in Over Two Decades: Why Didn’t the Fed’s Hike Stop Long Bonds from Falling?

On September 16, 2026, the Federal Reserve raised its policy rate by 25 basis points, bringing the federal funds target range to 3.75%–4.00%.

Eight days later, the 30-year Treasury yield reached its highest level since 2004. By September 28, the 10-year yield stood at 5.24% and the 30-year at 5.56%. When yields rise, bonds already on the market fall in price. Long-term Treasuries were still losing value.

Bond prices falling after a rate hike is not unusual. The question is why investors were still demanding higher yields to lend to the U.S. government for decades, even after the Fed had signaled its determination to contain inflation.

To understand that, we need to separate two kinds of borrowing.

Overnight Money and 30-Year Money

The federal funds rate affects what banks pay to borrow from one another overnight. The Fed can influence that rate directly.

A 30-year Treasury is different. An investor lending money for three decades cannot look only at today’s interest rate. They also have to ask: How much will prices rise over those years? What return will be left after inflation? And if interest rates change along the way, causing the bond they hold to lose value, how much compensation should they demand for that risk?

These are the three parts of a long-term yield: expected inflation, a real return, and the term premium, extra compensation for the risk of holding a bond over a long period. In the market, they affect one another.

So were long bonds falling in September mainly because investors had suddenly become more worried about inflation? The 10-year Treasury offers a way to look at that question.

From the start of the month through September 28, the yield on a conventional 10-year Treasury rose by about 0.45 percentage points. Over the same period, the yield on a 10-year Treasury Inflation-Protected Security, or TIPS, rose by about 0.46 percentage points. Because TIPS principal adjusts with inflation, the two yields rising by almost the same amount suggests that virtually none of the additional yield investors demanded was for inflation.

The borrower was the same U.S. government. Even after inflation was accounted for separately, investors still wanted a higher return.

Then there is the question of time. If you lend to the government for ten years, interest rates may change before the bond matures. How much extra will you charge for taking that risk? A Federal Reserve Board model estimated the 10-year term premium at about 0.97% on September 16. In some earlier years, that estimate had been negative.

At times, long-term Treasuries acted like insurance, and investors were willing to accept a little less return to hold them. Now, the risk of lending for years is being priced again.

Why are bond buyers no longer willing to lend at the old price?

Can the Government Still Count on Its Old Buyers?

The Fed used to buy long-term bonds on a large scale. In 2022, it began reducing its holdings. Balance-sheet runoff ended in late 2025, and proceeds from maturing Treasuries are being reinvested. But the Fed is no longer adding to its long-bond holdings on the scale it did during quantitative easing.

Some traditional overseas holders have changed their positions, too. China held around $1.3 trillion in U.S. Treasuries in 2013. By July 2026, the figure published by the U.S. Treasury had fallen to $618 billion. China does not represent every foreign buyer, but its holdings show that investors who once held large amounts of Treasuries may not keep buying at the same scale.

Meanwhile, the U.S. government still needs to borrow. In February, the Congressional Budget Office projected a fiscal 2026 deficit of about $1.9 trillion and net interest costs of roughly $1 trillion. Those were forecasts, not final bills. But when investors decide whether to buy long-term bonds, they consider how much debt the government may issue, and how much interest it will have to pay, in the years ahead.

None of this means the U.S. government is about to miss a payment.

The long-bond market’s response is more like a vote against the old price: you can still borrow for 30 years, but you cannot expect me to bear 30 years of risk for the same low compensation I once accepted.

Why Didn’t the Hike Bring Long-Term Yields Down?

There is a seemingly contradictory idea in the market: raising short-term rates can sometimes bring long-term rates down.

That is not a policy goal the Fed has announced. It is one possible market response. A rate hike pushes up short-term rates first. But if investors come to believe the central bank can bring inflation under control, they may demand less compensation for the risk of runaway prices or repeated swings in interest rates. Long-term yields could then fall.

The idea is to use discipline at the short end today to earn confidence at the long end tomorrow.

After September 16, that scenario did not play out for long. The 30-year yield rose from 5.35% on the day of the hike to 5.56% on September 28. One rate increase did not stop investors from reassessing future interest rates and the risks of holding long-term bonds.

Nor does that mean a few more hikes would necessarily stop long-bond prices from falling. If investors conclude that inflation will be harder to control, that high rates will last longer, or that the government will still need to issue large amounts of debt, higher short-term rates can feed through to long-term yields as well.

The Fed can raise rates. Only bond buyers can say, “I believe you.”

Who Pays When Long Bonds Fall?

The first to receive the bill are investors already holding older bonds with low coupon payments.

Suppose your old bond pays $1 a year in interest, while a newly issued bond with a comparable remaining maturity pays $5. If you need to sell the old bond now, you will have to lower its price. The longer a bond has until maturity, the more sensitive its price generally is to changes in interest rates.

“You can always hold it to maturity” only works if you really can wait. Silicon Valley Bank could not in 2023. Rising rates had reduced the value of its securities just as depositors rushed to withdraw their money. The bank sold about $21 billion of securities and recorded an after-tax loss of roughly $1.8 billion. Other factors also contributed to its failure, but falling securities prices made it costly to raise cash when the bank needed it.

The bill then reaches new borrowers. Companies issuing bonds generally pay a premium over Treasury yields to compensate investors for credit risk. When long-term Treasury yields rise, corporate financing and household mortgages also become harder to keep cheap.

Stocks are not immune. With Treasuries paying more, investors take another look at companies whose profits are still years away: how much are those future earnings worth today?

The more a company’s share price depends on profits far in the future, the more pressure its valuation may face. If the company also needs to borrow to expand, it faces a second squeeze: investors become more demanding about the price they will pay for its shares, while borrowing becomes more expensive.

More expensive mortgages, more expensive corporate financing, and pressure on stock valuations add up. Even if the Fed does not hike again, financial conditions are already tightening. Jerome Powell, then the Fed’s chair, made a similar point in 2023, identifying rising long-term bond yields as an important driver of tighter financial conditions at the time.

That makes the Fed’s next decision harder. Another hike would add to the tightening already coming from the market. Holding rates steady, however, would not guarantee that long-term yields stop rising. The Fed has to judge how much the market has already tightened conditions—and whether inflation still calls for another move.

The Fed can directly influence what banks pay to borrow overnight. It cannot decide for investors what return they should demand to lend to the U.S. government for 30 years.

Long-term yields kept rising not because bond buyers missed the rate hike, but because they were setting a new price.

Sources: U.S. Treasury daily Treasury and TIPS yield data (through September 28, 2026); Federal Reserve FOMC statement (September 16, 2026); Federal Reserve Board 10-year term premium estimate (Kim–Wright model, via FRED, September 16, 2026); U.S. Treasury TIC data on foreign holdings (July 2026); Congressional Budget Office, The Budget and Economic Outlook: 2026 to 2036 (February 11, 2026); Federal Reserve review of the Silicon Valley Bank failure (April 2023); Powell’s remarks to the Economic Club of New York (October 2023). This article is for educational purposes only and does not constitute investment advice.

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