Bond Yields Hit Two-Decade High as Oil Swings on Iran

U.S. Treasury yields surged to their highest levels in roughly two decades on Thursday as oil prices whipsawed on conflicting headlines about negotiations to end the seven-month war with Iran, deepening a global selloff in government debt.

The yield on the 30-year Treasury bond climbed as high as 5.47%, a level not seen in 22 years, while the 10-year note touched 5.18% — its highest since 2007. The moves rippled through household finances: the average 30-year fixed mortgage rate jumped to 7.37%, its highest since May 2024.

Why Yields Are Climbing

At the center of the surge is oil. The war with Iran has choked the Strait of Hormuz, a critical artery for global crude, sending energy prices sharply higher and reviving fears of persistent inflation that could force the Federal Reserve to tighten further.

According to CNBC, the 10-year yield jumped more than 13 basis points to 5.104% on Wednesday — its biggest one-day move since April 7, 2025 — after breaking through the psychologically important 5% level. The 2-year yield, which is most sensitive to expected changes in Fed policy, rose more than 11 basis points to 4.889%, its highest since May 2024.

Several forces converged. Stronger-than-expected surveys of U.S. economic activity, especially in manufacturing, caught the market off guard. Hawkish commentary from a top Fed official added upward pressure. And a Treasury auction of five-year notes drew weak demand.

“This is the market telling us we’ve entered a genuine re-tightening cycle,” Tony Miano, global investment strategy analyst at Wells Fargo Investment Institute, told CNBC. “You can’t fool or hide in the bond market — unless the Fed gets inflation under control the long end of the curve is going to continue to come under pressure.”

The sentiment was echoed globally. “The acceleration higher in U.S. rates yesterday is being felt globally, as if to highlight for the umpteenth time that we’re all in this global bond boat together,” Peter Boockvar, chief investment officer at OnePoint BFG Wealth, wrote in a note.

Japan’s 10-year bond yield rose to its highest since 1996, and Germany’s 10-year bund notched its highest yield since 2009.

Oil Swings on Iran Headlines

Oil prices reflected the market’s whipsaw on the diplomatic front. Brent crude closed up 3.4% at $106.60 a barrel, while U.S. crude settled up 2.6% at $94.61, after surging overnight on CBS News reports of stalled diplomacy before reversing intraday on a report of a phased U.S.-Iran deal, then resuming their climb.

Since the start of 2026, both benchmarks are up more than 65%. In the U.S., the national average diesel price reached $6.51 a gallon on Thursday — up 73% since the war began — while regular unleaded gasoline stood at $4.48, roughly 50% higher than in late February when the U.S. and Israel first attacked Iran.

The diplomatic picture remained murky. U.S. special envoy Steve Witkoff said mediators “shuttled between” the American and Iranian delegations during hours of indirect talks on the sidelines of the United Nations General Assembly, according to Al Jazeera. President Donald Trump described a claimed three-hour meeting as “very good” and “very productive,” though the White House later clarified he had not attended and that accounts differed over whether the two sides met directly.

Negotiators are reportedly exploring a phased path to end the war, under which Iran would reopen the Strait of Hormuz in exchange for the U.S. lifting its economic blockade, potentially alongside access to frozen Iranian assets. Iran has said it could reopen the waterway within seven days if Washington eases military pressure. NBC News said it has not confirmed the phased-deal report.

Bessent’s Buybacks Fall Flat

The bond market also shrugged off the Treasury’s latest intervention. On Thursday, Treasury Secretary Scott Bessent conducted the second round of his buyback program, repurchasing about $4 billion of 20- and 30-year bonds. Rather than calming the market, yields rose to their highest level of the session.

Earlier rounds met a similar fate. As The Guardian reported, Bessent announced in September that Treasury would buy back $6 billion in longer-term debt — triple the normal level — only for the bond market to rebuff the plan and push the 10-year yield to a three-year high at the time. The program had been scaled up in August, when CNBC reported Treasury said it would at least double the maximum size of its buyback operations, from $2 billion to at least $4 billion, targeting the longer-duration segment where a “buyers’ strike” had emerged since late June.

Bessent has publicly brushed off the criticism. “If some of the Bloomberg Terminal bros are unhappy with what I’m doing, well, that’s too bad,” he said in a September interview, after earlier declaring, “I am the house now.” Paul Donovan, chief economist at UBS Global Wealth Management, quipped in a note that “U.S. Treasury Secretary House Bessent seems to be demonstrating the house does not always win.”

Brian Rehling, co-head of global fixed-income strategy at Wells Fargo, told NBC News that Thursday’s operation “went more smoothly” mechanically, but warned that “long-end yields are still being set by inflation, Fed expectations and the volume of debt being issued.”

Fed Signals More Tightening

The rate picture darkened further as Fed officials lined up behind additional tightening. The central bank raised rates 25 basis points on Sept. 16 to 3.75%–4%, its first hike in three years. Since then, traders’ odds of another quarter-point increase in October have risen to 66.4% from 55% a day earlier, according to the CME FedWatch tool — up from less than 10% a month ago.

New York Fed President John Williams said it is “likely that another rate hike may be appropriate by the end of the year,” while Philadelphia Fed President Anna Paulson said she expects “some modest further tightening may be warranted.”

“The Fed’s 25 basis point hike last week was its first increase since 2023, and the dot plot signaled another this year,” Miano said. “A week ago you could argue that was a one-and-done insurance move. Today’s price action says investors no longer believe that.”

Adding to the inflation concern, S&P Global’s September purchasing managers’ indexes showed U.S. business activity “booming” — with services at 58.7 and manufacturing at 56.7 — even as input costs rose at the fastest rate in four years. “Fuel and transport costs [are] spiking higher thanks to the rise in oil prices,” said Chris Williamson, chief business economist at S&P Global Market Intelligence.

What to Watch

The coming days hinge on two variables: whether U.S.-Iran talks produce a credible path to reopening Hormuz, and whether inflation data soften enough to take further Fed hikes off the table. Neither is assured. With oil-driven price pressure feeding directly into borrowing costs for mortgages, auto loans and credit cards, the pain of the bond selloff is quickly becoming tangible for American households — and a political flashpoint ahead of November’s midterm elections.

As one indicator of the strain, Iran’s parliamentary speaker, Mohammad Bagher Ghalibaf, taunted Washington over the milestone. “Happy 5.1% 10Y America,” he posted on social media. “We’ll return you to 1970s rates, plus high gas prices, diesel shortages and bell-bottoms.”