Treasury vs. IMF: $40 Trillion Debt, 5% Yields Collide

The U.S. government's gross national debt passed $40 trillion in August 2026, and the 10-year Treasury yield touched its highest level since 2002 the following month. That backdrop has now produced a public argument between the Treasury Department and the International Monetary Fund over whether Washington's fiscal path is sustainable.

What Zervos and the IMF actually said

The dispute began in Bangkok, where the head of the International Monetary Fund urged Treasury Secretary Scott Bessent to trim the deficit, warning that his plan to lean on growth to tame U.S. government debt isn't sufficient, saying "growth of course helps, but it cannot deliver fast enough the necessary adjustments" at an IMF-World Bank annual meetings panel. Managing Director Kristalina Georgieva added that "the authorities very much rely on strong growth in the United States" to bring deficits down, a view responding to U.S. Treasury Secretary Scott Bessent, who told CNBC in August that the U.S. could "grow our way out" of a rising debt-to-GDP ratio, after government debt surpassed $40 trillion.

Treasury pushed back two days later. David Zervos, newly appointed counselor to the Treasury Secretary, said the IMF should check its own forecasting record before criticizing U.S. fiscal policy, telling CNBC in emailed comments, "When we see pieces on the IMF, it's good to remember how messy their forecasts have been in the past". Zervos, a former Jefferies chief market strategist, listed a string of past IMF misses, including a 2008 forecast of 3% world growth that preceded "the first global contraction in post-world history a year later," and a 1997 call that was "positive on Southeast Asia... before the collapse", as well as optimism on Argentina after its $57 billion bailout before the country "was basically in default again" by 2020. His conclusion: "So take it all with a grain of salt".

The figures both sides are arguing over

What the underlying data shows, separate from the rhetoric

The $40 trillion figure is the gross national debt, not the narrower "debt held by the public" measure economists often use to gauge market exposure; debt held by the public stands at over $32 trillion, according to the Committee for a Responsible Federal Budget. The pace of accumulation has been fast: the gross national debt officially reached $40 trillion according to the U.S. Treasury, after hitting its previous milestone of $39 trillion in March of the same year, less than five months earlier. Measured against the size of the economy, the federal debt is now over 1.2 times the amount the United States is expected to produce this year as GDP, a debt-to-GDP ratio reached only once before, during the borrowing of World War II.

On the deficit itself, the IMF's own numbers show a mixed picture rather than a one-directional deterioration. Its April 2026 Article IV consultation found the federal fiscal deficit fell from 6.3 percent of GDP to 5.9 percent of GDP in fiscal year 2025, while general government debt rose to 123.9 percent of GDP. Looking forward, though, the Fund projects no turnaround: the general government deficit is expected to remain in the 7 to 7.5 percent of GDP range, with debt exceeding 140 percent of GDP by 2031. That forward-looking 142%-of-GDP-by-2031 figure, not the improved 2025 reading, is what Georgieva was referencing when she said growth alone would not be enough. For context on urgency, Council on Foreign Relations economist Benn Steil noted in a September note cited by CNBC that "with the government running an annual budget deficit of 6 percent of GDP, the debt will rise another $7 billion by the end of today — and each subsequent day", an illustrative calculation based on the current deficit run-rate rather than an official Treasury figure.

Why the 10-year yield matters more than the debt headline

For everyday borrowers, the more consequential number may be the Treasury yield rather than the debt total. On October 7, 2026, the 10-year U.S. Treasury yield reached 5.36%, the highest level since 2002, and although it pulled back somewhat over the following days, it remained near that 24-year high. The 10-year yield is the benchmark off which mortgage rates, corporate borrowing costs and many other loans are priced, so a sustained move above 5% raises the cost of financing a home, a car or a business expansion independent of what the debt total is doing. Whether that yield move is being driven primarily by fiscal concerns, inflation expectations or Federal Reserve policy expectations was not addressed in the sourced reporting, and readers should not assume the IMF-Treasury dispute itself is moving yields; the two developments are concurrent, not proven to be causally linked in the sources reviewed.

What remains unresolved

Neither side's numbers are in dispute so much as their interpretation is. The IMF's own growth forecast for the U.S. — 2.3% in both 2026 and 2027 — is not dramatically different from what Treasury officials have touted; the disagreement is whether that growth rate is sufficient to bring debt-to-GDP down without additional tax or spending changes. Zervos's rebuttal challenges the IMF's credibility as a forecaster rather than offering a competing debt-to-GDP projection of his own, so readers looking for a Treasury-published alternative to the 142%-by-2031 estimate will not find one in the reporting so far. Whether the IMF's October 2026 Fiscal Monitor, which called on advanced economies to reduce deficits, prompts any specific U.S. policy response is not yet known.