The U.S. national debt has surpassed $40 trillion for the first time, marking a historic milestone in a borrowing buildup that has accumulated over generations, through wars, recessions, tax changes, and the expansion of major federal benefit programs under presidents of both parties.

The Treasury Department reported that total public debt outstanding reached about $40.047 trillion Tuesday, according to The Wall Street Journal and The New York Times.

The number is striking, but the more significant measure for economists is debt held by the public — money the federal government owes to investors and other entities outside the federal government.

That figure is approaching the size of the entire U.S. economy, with publicly held debt already exceeding 100% of gross domestic product, according to the Journal.

The $40 trillion figure represents the cumulative result of decades of federal borrowing rather than the policies of any single administration.

The United States has carried debt since its founding, when the young nation borrowed heavily to finance the Revolutionary War.

For much of American history, however, federal debt remained relatively modest compared with the size of the economy and often rose sharply during wars or economic emergencies before declining during periods of peace and economic growth.

That pattern changed substantially during the 20th century as the federal government took on broader responsibilities.

Social Security became a permanent part of the federal budget, Medicare was established in the 1960s, and the government’s role in healthcare, retirement benefits, national defense, and other areas continued to expand.

Major national emergencies produced additional surges.

Debt rose dramatically during World War II, and borrowing again accelerated during the financial crisis of 2008 and the COVID-19 pandemic, when Congress approved trillions of dollars in emergency spending and economic assistance.

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The Journal noted that the federal government has run an annual deficit every year since 2001, meaning it has consistently spent more than it has collected in revenue and has had to borrow to cover the difference.

The result is that borrowing that once was heavily associated with wars and economic crises has become a persistent feature of the federal budget.

The New York Times reported Wednesday that the government is on track to borrow more than $2 trillion this year.

A growing share of that borrowing reflects the cost of servicing debt accumulated in previous years.

Interest payments have become one of the largest expenses in the federal budget, with the cost rising as the government carries more debt and refinances older obligations at higher rates.

The fiscal pressures are increasingly visible in the bond market.

The yield on the 30-year Treasury recently reached roughly 5.3%, its highest level in nearly two decades, according to the Journal and Reuters.

Higher Treasury yields increase the government’s cost of issuing and refinancing debt and can also influence borrowing costs for households and businesses.

Still, investors continue to regard Treasury securities as among the world’s most important and liquid financial assets.

The United States also retains a major advantage from the dollar’s role as the world’s dominant reserve currency, which helps sustain demand for Treasury debt even as the government’s borrowing needs grow.

The long-term outlook, however, is becoming more challenging.

The Congressional Budget Office projects that if current laws remain in place, publicly held debt could rise to about 120% of GDP within a decade and roughly 175% within 30 years, according to the Journal.

Much of that projected increase is tied to the growing cost of Social Security, Medicare and other programs, as well as rising interest expenses.

The Trump administration is confronting those longstanding pressures while pursuing its own economic and fiscal priorities.

President Donald Trump has made reducing government waste, encouraging economic growth and strengthening federal finances among the administration’s goals.

The administration’s Department of Government Efficiency effort sought significant reductions in federal spending, while the administration has also pursued increased revenue through tariffs.

The New York Times reported that the administration has claimed more than $200 billion in DOGE-related savings, although the Government Accountability Office has raised questions about the reliability and transparency of some of those estimates.

Tariff policy has also produced substantial revenue, although the administration has faced legal challenges to some of the tariffs and the government is now issuing refunds to companies following court rulings.

Treasury Secretary Scott Bessent has set a goal of reducing the federal deficit to 3% of GDP by 2028.

Bessent has also argued that some current fiscal pressures reflect circumstances that could change, while policies encouraging business investment could strengthen economic growth and eventually produce additional tax revenue.

In an interview with Newsmax cited by The New York Times, Bessent pointed to spending associated with the war in Iran and tariff refunds as factors affecting this year’s deficit.

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He also defended provisions allowing businesses to immediately deduct certain investments in factories and equipment, arguing that the policy could encourage investment and expand the economy’s productive capacity.

“That is a hit now to the deficit, but we are creating productive assets for future growth which will be paying taxes down the line,” Bessent said, according to The New York Times.

The administration’s fiscal policies are therefore being implemented against a debt burden that was already enormous before Trump returned to office.

Republican and Democrat administrations have contributed to the accumulation through different combinations of tax policy, military spending, domestic programs, economic stimulus, and emergency measures.

The biggest challenge for lawmakers is that the largest components of federal spending are difficult to change quickly.

Social Security, Medicare, Medicaid, national defense, and interest on the debt account for substantial portions of federal expenditures, while lawmakers from both parties have generally been reluctant to make sweeping changes to popular benefit programs or enact tax increases large enough to eliminate the deficit.

The aging U.S. population is expected to put additional pressure on Social Security and Medicare in coming decades.

At the same time, interest costs can continue rising even without new spending because the government must continually refinance existing debt.

For now, the size and liquidity of the Treasury market and the dollar’s global role continue to give the United States considerable financial advantages.

But the $40 trillion milestone illustrates the scale of the challenge confronting Washington.

The debt has been built over decades and across administrations of both parties.

Reducing its growth will ultimately require decisions about spending, taxes, economic growth and the government’s major benefit programs that extend well beyond any single presidency.

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