The ongoing sell-off in the US Treasury market is now creating a rare buying opportunity for investors.

The 10-year Treasury yield broke above 5% this week, reaching a nearly three-year high, before climbing further to its highest level since 2007 as oil prices advanced. Although the Federal Reserve's first interest rate hike in over three years on Wednesday, aimed at curbing inflation, briefly pulled the yield back to 4.97%, the sharp rise in yields has left many investors nursing losses on major bond indices for 2026 and over the past five years. Meanwhile, rising long-end rates are pushing mortgage costs to more than one-year highs, adding fresh pressure to the economic outlook.

For investors, however, the bond rout also brings a silver lining—a chance not seen since the global financial crisis to lock in returns of around 5% annualized for a decade or longer. A growing number of asset managers are now acting on this opportunity. According to data from Morningstar, net inflows into US bond mutual funds and exchange-traded funds reached $625 billion through August this year, the highest for the same period since records began in 2010.

Fund flows into bonds hit a record high for the period

The scale of inflows has drawn widespread attention. Both Pacific Investment Management Company (PIMCO) and Vanguard Group anticipate that this pace of inflows will accelerate further as investors rebalance assets from equities into fixed income.

"For investors who have been fully invested in stocks for the past 15 years or more, these yield levels are highly attractive," said Kevin Nicholson, chief investment officer of global fixed income at Riverfront Investment Group, which manages about $17 billion in assets. He revealed that the firm has added to short-dated bonds and is considering longer maturities.

Last week's auctions of 10-year and 30-year Treasuries both cleared at the highest yields since 2007, yet demand remained robust—especially for the 30-year long bond, which saw historic demand at a yield of around 5.31%. When the 10-year yield broke above 5% this week, buyers quickly emerged, and the move was validated after the Fed's decision.

Daleep Singh, chief global economist at PGIM, said the inflow figures are "absolutely encouraging," adding that "even with record corporate bond issuance competing for the same pool of capital, Treasuries remain attractive at current yield levels." He also noted that concerns about a wave of borrowing by AI hyperscale data center operators pushing up Treasury yields are among the factors behind Treasury Secretary Scott Bessent's push for measures such as increased long-dated bond buybacks.

5% yield provides a 'safety cushion', bond math supports buying

The yield surge is not confined to the 10-year note but has spread across the entire investment-grade US fixed income market. The yield-to-worst on the Bloomberg US Aggregate Index has climbed to 5.3% from 4.15% before the Iran war broke out in February this year.

This level is also becoming more attractive relative to money market funds—which averaged around 3.4% yields before the Fed's rate hike. Meanwhile, the spread between the 10-year Treasury yield and the S&P 500's expected dividend yield for next year has risen to near the highest level in nearly two decades of data compiled by Bloomberg.

"Bonds are back, yields are in place, and this is a powerful tool," said Matt Wrzesniewsky, head of fixed income client portfolio management at Vanguard. "A 5% yield is typically the level where the market starts to truly converge on a consensus."

The bond math also supports current buyers. Michael Cudzil, senior portfolio manager at PIMCO, pointed out that given the income levels currently generated by the US Aggregate Index, investors entering now would only start to lose money if yields were to rise further to around 6.2% within the next year—a level the benchmark's yield-to-worst has not exceeded since 2001. "For buyers at current levels, there is plenty of upside in yields as a buffer," he said.

Demographic shift fuels sustained long-term bond demand

The ongoing stock market rally is also boosting demand for bonds. Morningstar data shows that target-date funds have increased their bond holdings every quarter since the end of 2023—these funds become progressively more conservative as investors near retirement.

With a large cohort of baby boomers about to exit the workforce, the demand for stable investment income is expected to persist over the long term, particularly when yields are at elevated levels.

"We are still in the demographic cycle where baby boomers are shifting assets more toward stable income investments—bonds and high-dividend stocks—and away from pure growth equities," said Shelly Antoniewicz, chief economist at the Investment Company Institute.

Of course, over the past five years, the appeal of bonds has been touted repeatedly, only to be dashed by unexpectedly strong growth, inflation, and fiscal concerns. Hoisington Investment Management, a long-time US bond bull, turned bearish in July this year, a sign of this risk. But for investors stepping in now, the cushion provided by yields above 5% is prompting a growing number of money managers to reassess the value of this asset class.