US public debt has climbed beyond $40 trillion, marking a dramatic increase over the past 25 years as the country has faced wars, economic crises, tax reductions, pandemic-related spending and rising government expenditures.
According to data from the US Treasury Department, the national debt stood at approximately $5.8 trillion in August 2001. It surpassed $10 trillion in 2008, with military spending related to the wars in Afghanistan and Iraq and tax cuts contributing significantly to the increase.
Government rescue programs introduced following the 2008 global financial crisis further added to the country’s borrowing needs. By 2017, US public debt had reached $20 trillion.
The COVID-19 pandemic then accelerated the increase. The US government introduced trillions of dollars in stimulus measures to support the economy during the crisis, pushing public debt beyond $30 trillion in early 2022.
Borrowing has continued to grow since the pandemic because of defense spending, government programs and other fiscal pressures. The debt stood at around $38.4 trillion at the beginning of 2026 before reaching approximately $40.1 trillion on August 18.
It took only about four and a half years for US public debt to rise from $30 trillion to $40 trillion, highlighting the increasingly rapid pace of government borrowing.
Economists point to several factors behind the growing debt burden, including higher interest costs, an aging population, increasing Social Security expenses, tax cuts, crisis-related stimulus programs and the persistent gap between government revenues and spending.
Higher interest rates adopted by the Federal Reserve to control inflation have significantly increased the government’s borrowing costs. Meanwhile, tax reductions have limited government revenues while defense and social spending have continued to contribute to structural budget deficits.
Treasury data showed that federal government revenues increased by 5% during fiscal year 2026. However, the budget deficit still grew by 10% during the first ten months of the fiscal year through July. Interest payments on the national debt reached $1 trillion during that period.
The debt burden relative to the size of the economy has also remained high. The debt-to-GDP ratio reached 123.7% in the second quarter of 2020, declined to 115.6% in early 2023 and stood at 122.6% at the end of the first quarter of 2026. US public debt first became larger than the country’s economy in 2012.
Meanwhile, rising government borrowing has contributed to pressure in the Treasury bond market. Bond yields have also been affected by heavy corporate borrowing linked to artificial intelligence infrastructure investment, tensions involving Iran and concerns about inflation caused by higher oil prices.
Long-term Treasury yields reached their highest levels in nearly two decades amid US-Iran tensions. The Treasury Department recently announced plans to at least double its long-term bond buyback operations, providing some temporary support to the market.
However, economists believe that there are few indications that the country’s large budget deficits will decline soon. The Committee for a Responsible Federal Budget said US public debt had increased by $1 trillion in less than five months, while the total debt has doubled over the past decade and quadrupled in less than two decades.
The scale of the increase is particularly striking when compared with US history. It took nearly two centuries for the country’s debt to reach $1 trillion in 1981. Today, the government spends more than that amount annually on interest payments alone.
Maya MacGuineas, president of the Committee for a Responsible Federal Budget, warned that the $40 trillion debt burden affects more than government accounts. According to her, rising borrowing can contribute to inflation, reduce the funds available for other government priorities and leave the country less prepared to respond to future crises.
She acknowledged that improving the nation’s financial position would take time but said avoiding additional borrowing could be an important first step toward addressing the problem.
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