The United States government paid the highest price in a quarter of a century to borrow money for 30 years, after Thursday's Treasury auction cleared at a yield of 5.216%. That is the highest rate for this maturity since August 2001, when the Treasury briefly abandoned the 30-year bond altogether.
The $25bn sale drew a bid-to-cover ratio of 2.39, only slightly below the 2.44 recorded at July's auction, according to Bloomberg. Demand held up reasonably well, but the direction of travel is unmistakable: yields on the 30-year bond climbed from 5.058% in July and 5.046% in May, both of which had already marked the first time long-term US borrowing costs topped 5% since 2007.
Why yields keep climbing
A Treasury yield is essentially the interest rate the US government pays to borrow from investors who buy its bonds. When that rate rises, it becomes more expensive for Washington to finance its debts, and the effect ripples outward into mortgage rates, corporate borrowing and other forms of consumer credit.
The immediate trigger, according to reporting from the Guardian's business live blog, was renewed inflation concern combined with unease about the sheer scale of federal borrowing needed to fund a deficit that has widened sharply this year. Wednesday's 10-year Treasury auction had already drawn its highest yield since 2007, a day before the 30-year sale.
“"We expect today's 30-year auction to clear without difficulty, but a successful auction shouldn't be confused with strong structural demand for long-duration assets," Michal Stanczyk, a portfolio manager at Allspring Global Investments, wrote in a note cited by Bloomberg.”
The Treasury's fiscal year-to-date interest tally now stands at $1.17tn, up 15% on the year, largely because higher yields make existing and new debt costlier to service, according to Bloomberg's reporting. The Treasury has signalled it may curb the supply of long-dated bonds if demand keeps softening, a sign officials are watching the market closely.
The Japan connection
The bond market turmoil also helps explain an unusual episode earlier this month, when the US and Japan carried out a rare joint intervention to support the yen. Japan's Ministry of Finance confirmed it had conducted a coordinated yen-buying operation with the US Treasury, with both sides signalling readiness to act again if needed, according to CNBC.
Treasury Secretary Scott Bessent said the action "countered disorderly yen movements", while President Trump described it as a gesture of friendship toward an ally. But analysts at the Council on Foreign Relations have suggested the intervention was driven as much by concern over US Treasury bonds as by the yen itself. Japan is one of the largest foreign holders of US government debt, and Washington was reportedly wary that Tokyo might sell some of those holdings to defend its currency, a move that could have pushed American borrowing costs even higher.
What it means for the wider economy
For European readers, the episode is a reminder of how closely linked global bond markets remain. Higher US Treasury yields tend to pull up borrowing costs elsewhere, including in the eurozone and the UK, as investors compare returns across government debt markets.
The pressure comes at an awkward moment for Washington, with midterm elections in November and Fed chair Kevin Warsh facing scrutiny over the central bank's next moves on interest rates. Inflation had peaked at 4.2% in May, partly linked to the fallout from the Iran conflict, before easing to 3.4% in July, but bond investors remain wary that price pressures, including from tariffs, have not been fully tamed.
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