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US national debt tops 40 trillion as Treasury doubles bond buybacks to calm markets
U.S. national debt exceeds 40 trillion for first time as borrowing costs surge
The U.S. national debt surpassed $40 trillion for the first time on Wednesday, reaching $40.05 trillion, according to Treasury Department data released that afternoon .
The debt milestone came as the U.S. Treasury announced it would at least double purchases of long-term government debt, from $2 billion to $4 billion per operation, starting Sept. 9, to stabilize bond markets amid rising borrowing costs . The 30-year Treasury yield had climbed to its highest level since 2007 before the announcement, with analysts citing a buyers’ strike and swelling corporate debt tied to AI data center spending .
The debt surge has accelerated under President Donald Trump’s second term, growing by $3.8 trillion since January 2025, bringing the total increase across his two terms to $11.6 trillion . The debt had previously risen by $8.4 trillion during Joe Biden’s presidency and $7.8 trillion during Trump’s first term, with pandemic spending a major driver .
Marc Goldwein, senior policy director at the Committee for a Responsible Federal Budget, called the debt figures a “gigantic flashing ‘check engine’ light” . Maya MacGuineas, president of the same organization, said in a statement that the debt “doesn’t exist solely on the government’s ledgers; it is felt throughout the economy” .
The Treasury’s intervention followed a global sell-off of government bonds, with yields rising sharply in the U.S. and Europe. In Germany, 10-year bond yields reached 3.25%, the highest in over 15 years, while U.S. 30-year yields hit 5.3% earlier this week . Economists, including Clemens Fuest of the Ifo Institute and Monika Schnitzer of Germany’s Council of Economic Experts, urged fiscal consolidation, warning that rising inflation and debt could force central banks to maintain higher interest rates .
U.S. Treasury Secretary Scott Bessent’s announcement of expanded buybacks was described by Thomas Simons, chief U.S. economist at Jefferies, as a departure from the Treasury’s usual steady communication, calling it “shot from the hip” . Mohamed El-Erian, a notable economist, suggested the market’s positive reaction reflected hopes for broader intervention rather than the direct impact of the buybacks .
The debt now exceeds the size of the U.S. economy, with debt held by the public at approximately $32 trillion . The Federal Reserve’s latest policy minutes indicated concerns that persistently high inflation could become embedded in the economy .
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