The article discusses the evolution of U.S. debt, tracing its origins back to Alexander Hamilton's consolidation of debts from the Revolutionary War in 1790, which positioned the U.S. as a credible borrower. Initially viewed as a source of national strength, U.S. debt has ballooned to $39 trillion today, creating significant interest costs that outpace federal budgets. There are growing concerns about the sustainability of this debt, with models suggesting a solvency threshold of 210% of GDP. Current projections estimate the debt-to-GDP ratio to reach around 175% by 2056, raising alarms about the implications for future fiscal policies, especially in light of rising healthcare costs.

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Economy Debt

U.S. debt is a looming crisis today but was once its own revolutionary masterstroke that helped launch a global financial superpower

Jason Ma

By Jason Ma Jason Ma

Weekend Editor Down Arrow Button Icon

Jason Ma

By Jason Ma Jason Ma

Weekend Editor Down Arrow Button Icon

July 4, 2026, 3:03 PM ET

A statue of the first United States Secretary of the Treasury Alexander Hamilton stands in front of the U.S. Treasury September 19, 2008 in Washington, DC.

A statue of the first United States Secretary of the Treasury Alexander Hamilton stands in front of the U.S. Treasury September 19, 2008 in Washington, DC. Chip Somodevilla/Getty Images

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Believe it or not, U.S. debt was once a source of national strength, before it became a sword of Damocles hanging over the federal government and the bond market.

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Although the precise debt level that would spark a crisis is unknown, the Penn Wharton Budget Model recently put the threshold at more than 210% of GDP.

Above that “outer bound,” there’s no feasible tax on labor income that can finance interest payments on U.S. debt at returns acceptable to investors, PWBM warned.

According to PWBM, the outer bound of federal debt is the solvency limit, beyond which defaulting on either Treasury debt or pay-as-you-go transfers like Social Security becomes a near certainty on an inflation-adjusted basis.

The debt-to-GDP ratio is about 100% today, and forecasts from the Congressional Budget Office see it hitting 175% by 2056—suggesting 210% is decades away on its current trajectory.

But depending on how much healthcare costs rise and boost Medicare spending, that threshold could come much sooner.

The U.S. has 25 more years in a lower-growth scenario, 22 years with medium growth, and 19 years with higher growth, PWBM estimated. But even that may downplay the risk.

“Under the historical growth rate of healthcare costs, there is a 25% chance of hitting the debt maximum in 14 years,” it added.

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About the Author

By Jason MaWeekend Editor

Jason Ma is the weekend editor at Fortune, where he covers markets, the economy, finance, and housing.

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