The United States’ largest debt is not owed to any single country but to the public itself. Debt held by the public is the biggest component of the $37 trillion national debt, making it the most significant liability for the federal government.
What Is Debt Held by the Public?
Debt held by the public includes U.S. Treasury securities owned by individuals, corporations, state and local governments, foreign investors, and the Federal Reserve. As of mid-2025. this accounts for about $29.5 trillion of the total national debt.
Who Holds the Majority of This Debt?
The largest portion is held domestically—by U.S. pension funds, mutual funds, banks, and individual investors. The Federal Reserve is also a major holder, especially after years of quantitative easing. Foreign countries hold about 25% of the public debt, with Japan as the top holder.
Why Is Public Debt So Large?
Chronic budget deficits, rising interest costs, and major spending during crises like the COVID-19 pandemic have fueled the growth of public debt. The cost of servicing this debt—paying interest—is one of the fastest-growing expenses in the federal budget.
Conclusion
The U.S.’s largest debt is the one owed to the public, both at home and abroad. Understanding this breakdown reveals why domestic investors are just as critical as foreign creditors in sustaining the U.S. government’s borrowing capacity.
