When Does Federal Debt Reach Unsustainable Levels? Spring 2026 - Onward
We estimate that the United States federal debt cannot rationally exceed roughly 210 percent of GDP as an outer limit. Under historical excess cost growth in healthcare, this outer limit is likely reached within 20 years; there is a 25% chance of reaching it in 14 years. Debt markets unravel earlier if beliefs about government repayment shift.