US Debt-to-GDP Ratio Returns to 100% for the First Time in 80 Years
The "publicly held debt" of the United States has risen to about 100%-101% of the Gross Domestic Product (GDP), marking the first time this level has been reached since the end of World War II in 1946. This milestone data was released by the Bureau of Economic Analysis (BEA) on April 30, corresponding to the GDP data for the 12 months ending in March this year.
As of the end of April this year, the size of the publicly held debt in the US was $31.27 trillion, while the nominal GDP for the same period (April 2025 to March 2026) was $31.22 trillion, resulting in a debt-to-GDP ratio of approximately 100%-101%. The historical peak of this ratio was 106% at the end of World War II in 1946. The Congressional Budget Office (CBO) predicts that this ratio will continue to rise in the coming years, reaching 108% by 2030, surpassing the historical record set in 1946, and further increasing to 120% within the next decade.
It is important to note that "publicly held debt" (excluding intergovernmental holdings, such as Social Security trust funds) is a different metric from the "total national debt" commonly cited in the media. Based on total national debt, US national debt surpassed $40 trillion on August 19 (Wednesday), just five months after breaking the $39 trillion mark in March this year. The International Monetary Fund (IMF) predicts that based on total national debt and nominal GDP, the US debt-to-GDP ratio will be approximately 125.8% by 2026, higher than the 103.7% in 2012.
The US national debt took nearly 200 years to grow from zero to the first trillion dollars (reached in 1981), but has doubled in the past decade and quadrupled in less than twenty years. Maya MacGuineas, chair of the Committee for a Responsible Federal Budget, stated, "The debt level has now exceeded 100% of GDP, and surpassing the historical record is just a matter of time."
The US government currently pays over $1 trillion annually in interest on the national debt, exceeding the $918 billion defense budget, making it the second-largest fiscal expenditure item after Social Security. In the first ten months of the fiscal year 2026, interest payments increased by 15% year-on-year. Jonathan Williams, president of the American Legislative Exchange Council (ALEC), pointed out that "net interest payments on the national debt have now exceeded $1 trillion annually," warning that the current debt level threatens the US's defense readiness.
As of the end of June this year, approximately 76% of US national debt is held by domestic entities (Federal Reserve, government accounts, US banks, pension and mutual funds, insurance companies, state and local governments, and households), while 24.1% (about $9.27 trillion) is held by foreign investors, with Japan being the largest single foreign creditor, holding $1.12 trillion (12% of total foreign holdings). The most directly impacted is the long-end interest rate market—during the week when total national debt surpassed $40 trillion in August, the yield on 30-year US Treasury bonds rose to a 19-year high, and the 30-year mortgage rate approached 6.7%; the ongoing expansion of the fiscal deficit (current fiscal year deficit has exceeded $2 trillion) is also a direct reason for the recent increase in short-term Treasury bond issuance and enhanced buyback operations by the US Treasury.
The speed of debt expansion is directly related to presidential terms—during Trump's second term, which lasted only 18 months, the new national debt exceeded $3.5 trillion, and combined with the $9.8 trillion added during his first term, the total new national debt reached $13.3 trillion, surpassing the $13.2 trillion increase during Obama's two terms (adjusted for inflation); the CBO predicts that by the end of fiscal year 2028, the total US national debt will reach $43.3 trillion. In the structure of federal budget expenditures for 2025, Social Security accounts for 22.5%, Medicare about 14%, defense spending 13%, while interest payments have reached 13.8%, surpassing defense spending for the first time. The Wharton School's budget model estimates that the rational upper limit for the US national debt-to-GDP ratio is about 210%, and if healthcare cost growth maintains historical levels, this limit could be reached in as little as 19 years.
Source: Public Information
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The last time the US national debt-to-GDP ratio exceeded 100% was during the massive wartime financing period of World War II—when the US financed military expenditures by issuing war bonds, reaching a historical peak of 106% in 1946. After that, thanks to rapid post-war economic growth and relatively restrained fiscal spending, this ratio was significantly reduced in less than a decade. This time, the debt ratio returning to 100% is not due to a nationwide mobilization for war, but rather the long-term structural growth of entitlement programs such as Social Security and Medicare, compounded by the fact that the US has almost never achieved a budget surplus in the past 25 years (the last surplus was in fiscal year 2001)—which means this round of debt expansion lacks the natural digestion path seen during the post-war economic boom, making the two situations fundamentally different.
The evolution of funding paths is clear—during Trump's second term, which lasted only 18 months, $3.5 trillion of new national debt was added, bringing the total new national debt during his two terms to $13.3 trillion, exceeding the $13.2 trillion increase during Obama's two terms (adjusted for inflation), making it one of the fastest-growing presidential terms in terms of debt; at the same time, the Treasury is increasing short-term national debt issuance and enhancing long-term bond buyback operations to lower current interest costs. This means the federal government is shifting the ever-expanding debt burden to the future through short-term debt rollovers and intertemporal refinancing, rather than actually resolving it through deficit reduction.
The current stage of US fiscal policy stands in stark contrast to the "post-war deleveraging period" after 1946: at that time, the US relied on rapid economic growth, the demographic dividend from the baby boom, and relatively restrained government spending to quickly reduce the debt ratio within a decade; whereas the current US economic growth rate is only 1.5% (annualized growth rate of real GDP in Q2 2026), far below the post-war golden age, compounded by the ongoing aging population that continues to drive up Social Security and Medicare expenditures, resulting in a lack of macroeconomic conditions for a natural decline in the debt ratio. This makes the current "debt surpassing 100%" more akin to a structural, long-term fiscal imbalance, rather than a one-time, short-term shock that can be naturally digested by economic growth.
This essentially represents a structural change in regulation and intergenerational resource allocation—interest payments now account for a larger share of the federal budget than defense spending (13.8% vs. 13%), indicating that US fiscal resources are being systematically shifted from expenditures "for current public services and national security" to expenditures "for servicing historical debt costs." Mechanistically, once this transfer reaches a scale, it becomes difficult to reverse: interest payments will continue to expand as they rise with the debt stock and interest rate levels, forming a self-reinforcing cycle of "the more debt, the higher the interest, the larger the deficit, the faster the debt growth"; estimates from the Wharton School indicate that if the current policy path is maintained, a self-fulfilling crisis triggered by shaken market confidence could occur in as little as 14 years, without waiting for the theoretical 210% "rational upper limit" to actually arrive—this means that the actual trigger point for debt risk could occur earlier than the timeline provided by pure mathematical models.
ABAB News · Cognitive Law
Post-war debt was digested through growth, this time debt relies on borrowing to pay off old debts
The day interest exceeds defense spending, the priority of the budget has changed
Debt crises do not wait for formulas to be completed; market confidence collapses first