The United States federal debt hit a record $40 trillion on Tuesday, according to the Treasury Department, reaching the milestone years earlier than the Congressional Budget Office's 2023 projection of fiscal year 2028. The debt has grown $1 trillion in just the past five months, with a $1.8 trillion deficit accumulated in the first ten months of the fiscal year.

Experts warn the trajectory is unsustainable. Michael Peterson, CEO of the Peter G. Peterson Foundation, noted the nation was at $20 trillion less than a decade ago and could reach $50 trillion within six years. Interest payments are expected to top $1 trillion this fiscal year — more than triple the level from five years ago — now rivaling Medicare as the second-largest federal expense behind Social Security. Marc Goldwein of the Committee for a Responsible Federal Budget said the U.S. is "spending significantly more to service past debt than to invest in our future."

Aging demographics, with roughly 10,000 Baby Boomers retiring daily, drive higher Social Security and Medicare costs. Meanwhile, legislation including the Tax Cuts and Jobs Act of 2017, the One Big Beautiful Bill Act of 2025, and pandemic relief bills have added trillions to projected debt. Rising yields on 30-year Treasuries, hitting their highest since 2007, reflect investor concern. Moody's downgraded U.S. debt in 2025, stripping the last perfect credit rating. Maya Mac Guineas warned the debt "exacerbate[s] inflation, squeeze[s] out other priorities... and leave[s] ourselves vulnerable to emergencies."