Bond selloff lifts the discount rate under long-dated valuations to 5.145%
Traders betting on lasting inflation pushed the 10-year Treasury yield to 5.145% on Thursday, its highest since the 2007 financial crisis. Oil back above $105 keeps that bet alive, and AXA's chief economist names two more pressures, tech-sector borrowing and US debt, that would survive a truce.
The Investor · Invest desk

What happened
- Japan's 10-year government bond yield jumped to its highest level in 30 years overnight in Asia.
- US mortgage rates climbed above 7% as Treasury yields held over 5% into Friday.
- The selloff in Treasuries and other benchmark government bonds was the sharpest since last year's Liberation Day turmoil, driven by worries over the Iran war and inflation.
- The gap between French and German borrowing costs reached its widest since Mario Draghi's 'Whatever it Takes' speech in 2012.
Why it matters
- What it costs cost Investors who bought long-dated assets when Treasury yields were lower bear the repricing, because the same cash flows justify a lower price against a 5.145% base.
- Who has to decide decision Long-run rate assumptions in underwriting now need a path for after a Gulf truce as well as during the war, since tech-sector borrowing and US debt would still press on yields.
- Who's exposed exposure Equity holders are exposed to a repeat of the last time the 10-year broke 5%, when the MSCI world index went on to halve, although that fall came with the financial crash.
Next story · Invest · Oct 4
Gulf crude regains prewar volume by sending 40% of it around HormuzConfirmed4 publishers
Discount a dollar that arrives every year forever at 5.145% and it is worth about 19.4 dollars today [1][17]. That figure comes before an underwriter adds any spread for credit risk or illiquidity. Every long-dated price quoted as a spread over the 10-year sits on top of it.
Whether that base holds depends on what is pushing it up. On energy, this week's evidence points to persistence. JP Morgan's chief economist predicted that the surge in energy prices sparked by the US-Iran war would persist, with supply bottlenecks and rising commodity prices adding to inflation, Semafor reported [9]. Oil moved back above $105 a barrel on Thursday [10]. Iran's President Pezeshkian said Iran would not allow freedom of navigation through Hormuz while the US blockade and sanctions remained in place, according to Reuters [11].
Energy is one pressure among several. "Inflation is high, central bankers are giving hawkish messages, there's competition from the funding needs of the tech sector and there are no reassuring signs on the US debt trajectory," Gilles Moec, AXA's chief economist, said [12]. Two of those four items concern how much debt is coming to market, and neither moves with the price of a barrel. A weak US government bond sale, along with strong PMI data, compounded Wednesday's rout [6]. Moec put the Middle East on top of all that as "the binary geopolitical issue" [13].
A truce that reopens Hormuz would pull oil down and take the energy premium out of the inflation bet. A growth scare could send buyers back into Treasuries with inflation still high. Or the supply pressures Moec listed keep long yields up after the oil premium fades. I'd expect the third, and if it holds, cheap long-term money stays scarce after the war as well as during it. The counter-thesis is that the selloff is mostly an oil trade. It has a clean test: a 10-year back well below 5% within weeks of a truce would show that energy carried most of the move, and underwriters could price for cheaper money again.
Governments borrow off the same benchmark. Global debt topped $365 trillion, roughly three times GDP, CNBC reported, and Semafor cited warnings that governments were caught in a "vicious cycle" of short-term fixes and long-term vulnerability [14]. On the $29 trillion Treasury market alone, each percentage point of yield comes to $290 billion a year of extra interest once the whole stock has rolled over at the higher rate [1][16].
What to watch
- The next US Treasury auction: a second weak sale would favour the debt-supply explanation for high yields over the oil one.
- Iran's conditions for restarting truce talks, flagged by Deutsche Bank analysts: acceptance of an Oman-Iran shipping route, an end to the naval blockade and release of frozen assets.
- Reports that Trump is weighing an export ban on US-produced diesel, a move that would add to the energy side of the inflation bet.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
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Reality
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- [1]
The 10-year US Treasury yield, the benchmark of the $29-trillion Treasury market, touched a new post-financial-crisis high of 5.145% in early European trading on Thursday, September 24.
- [2]
Japan's 10-year government bond yield jumped to a 30-year high overnight in Asia.
- [3]
US Treasury yields hovered above 5% on Friday, a level not seen since the 2007 financial crisis, helping push American mortgage rates to more than 7%.
- [4]
Concerns about the Iran war and inflation triggered the sharpest selloff in US Treasuries and other benchmark government bonds since last year's Liberation Day turmoil.
- [5]
The global bond selloff sent long-term borrowing rates higher as traders bet that inflation will remain elevated.
- [6]
Strong PMI data and a weak US government bond sale compounded Wednesday's global bond rout.
- [7]
The MSCI world index halved in value after the last time the 10-year Treasury yield broke 5%, which was just before the global financial crash.
- [8]
The difference between what France and Germany pay to borrow was at its widest since Mario Draghi's 'Whatever it Takes' speech of 2012.
- [9]
JP Morgan's chief economist predicted the surge in energy prices sparked by the US-Iran war would persist, with supply bottlenecks and rising commodity prices stoking inflation too.
- [10]
Oil prices moved back above $105 a barrel on Thursday.
- [11]
Iran's President Pezeshkian said Iran would not allow freedom of navigation through Hormuz while the US blockade and sanctions remained in place.
- [12]
"Inflation is high, central bankers are giving hawkish messages, there's competition from the funding needs of the tech sector and there are no reassuring signs on the US debt trajectory,"
- [13]
"They are all fairly big macro issues and on top of that you have the binary geopolitical issue of what is happening in the Middle East."
- [14]
Global debt topped $365 trillion, roughly three times GDP, prompting warnings that governments were caught in a 'vicious cycle' of short-term fixes and long-term vulnerability, CNBC reported.
- [15]
Deutsche Bank analysts pointed to Iran foreign ministry comments that it had presented the US with conditions for restarting truce talks, including acceptance of a shipping route agreed by Oman and Iran, an end to the naval blockade and release of Iran's frozen assets.
- [16]
Each percentage point of yield on the $29 trillion Treasury market equals about $290 billion a year of interest once the whole stock has repriced.
- [17]
A perpetual annual cash flow discounted at the 5.145% 10-year Treasury yield is worth about 19.4 times the annual payment, before any risk spread.
- [18]
Reports have suggested that Trump is considering a possible export ban on US-produced diesel.
Sources
2 independent publishers whose own reporting we read for this story.
- finance.yahoo.comBond market selloff rumbles on ahead of Trump and XI talks
1 article · September 24, 2026
- semafor.comGlobal bond selloff pushes borrowing rates higher
1 article · September 25, 2026
Topics and entities
Topics
- Sovereign Debt
- US-Iran Conflict
- Oil and energy prices
- Government bond markets
- Inflation