Washington DC: The US national debt has crossed the $40 trillion mark for the first time, intensifying concerns over the country’s fiscal trajectory and the growing impact of government borrowing on households, businesses and Washington’s ability to fund future priorities.
The milestone comes as long-term Treasury yields climb to their highest levels since 2007, federal interest costs surge and massive private-sector investment in artificial intelligence creates another major demand for capital.
The $40 trillion figure represents gross federal debt, including money the government owes to its own accounts. Economists generally concentrate on the roughly $32 trillion in debt held by the public because it more directly reflects the government’s borrowing from investors and other outside holders. The debt has increased by about $3 trillion in just the past year.
The scale of the increase is particularly striking given President Donald Trump’s earlier pledge in 2016 to eliminate what was then approximately $19 trillion of national debt within eight years. Instead, federal borrowing has more than doubled since then.
Borrowing costs are spreading through the economy
The consequences of the debt are increasingly visible beyond Washington’s balance sheet. A recent report from the Conference Board warned that persistent federal borrowing could put upward pressure on interest rates if investors demand higher returns to compensate for growing concerns about America’s fiscal position.
Higher Treasury yields can translate into more expensive borrowing for households and companies. Mortgage rates, for example, tend to track the 10-year Treasury yield closely.
Brett Loper, executive vice president for policy at the Peter G. Peterson Foundation, said rising government borrowing costs can therefore feed into mortgage rates and eventually affect auto loans, business financing and bonds used to fund projects such as school construction.
JD Vance's response to the US debt hitting $40 trillion is to blame Biden pic.twitter.com/S5EIQqUqlN
— Aaron Rupar (@atrupar) August 20, 2026
The mechanism is straightforward when the government must offer higher yields to attract buyers for its debt, borrowing costs across financial markets can rise. That can discourage business expansion, hiring and investment while making home ownership and other major purchases more expensive.
The debt also creates inflation risks. If investors begin to believe that Washington could ultimately resort to monetary expansion or other inflationary measures to manage its fiscal problems, inflation expectations could rise. Such concerns could place additional pressure on prices and interest rates.
Meanwhile, the government’s own interest bill is consuming an increasingly large share of federal resources. The federal government is projected to spend more than $1 trillion on net interest in 2026, according to Congressional Budget Office projections. During the first 10 months of the current fiscal year alone, Washington had already spent $963 billion on interest, about $200 billion more than it spent on the military during the same period.
That growing interest burden leaves lawmakers with less flexibility to finance defence, infrastructure, education and other priorities.
A debt cycle meets an AI investment boom
The fiscal challenge is being compounded by the government’s continuing need to refinance enormous amounts of existing debt. The Treasury is expected to refinance about $9.7 trillion coming due during the fiscal year while also financing a federal deficit projected by the CBO at roughly $2.1 trillion.
The result is a difficult cycle that maturing debt must be replaced with new borrowing, potentially at higher interest rates, while the larger interest bill itself contributes to future deficits. The CBO projects average annual deficits of about $2.4 trillion through 2036, with debt held by the public eventually reaching 120 per cent of GDP, above the previous post-World War II record.
The pressure is arriving at a time when America’s private economy is also demanding enormous amounts of capital for artificial intelligence. Big technology companies that once financed much of their expansion through cash are increasingly turning to bond markets to fund AI infrastructure.
Bond issuance by major technology companies, often described as hyperscalers, is expected to roughly double in 2026. Goldman Sachs estimates that debt could finance more than one-third of their AI spending by 2027.
Nine major technology companies have already spent around $600 billion on capital projects over the past year, while a Wall Street Journal analysis identified another roughly $3 trillion in future commitments, much of it associated with AI infrastructure, that has not yet appeared on their balance sheets.
Nvidia is also working with BlackRock, Goldman Sachs, KKR and other financial firms on plans to mobilise more than $500 billion for AI infrastructure.
This creates a broader competition for capital: Washington needs trillions to refinance existing obligations and finance deficits, while America’s technology sector is seeking unprecedented sums to build data centres, computing capacity and other AI infrastructure.
Shrinking fiscal room and a growing political reckoning
The debt problem extends beyond borrowing costs. Social Security’s retirement trust fund is projected to be depleted in late 2032, while Medicare’s hospital insurance trust fund is expected to run short in the second quarter of 2033.
At the same time, Trump’s tax-and-spending legislation is projected to add trillions of dollars to federal deficits over the coming decade. The White House has also sought tens of billions of dollars in additional funding connected to the war with Iran.
That moment when Donald Trump was warning about the dangers of the US reaching $24 trillion in debt:
"That's the point of no return. That's when we become a country that's unsalvageable"
Today, US national debt has reached $40 trillion. pic.twitter.com/SXKcEurXFp
— Richard (@ricwe123) August 20, 2026
Efforts to restrain spending have produced limited results. Elon Musk’s Department of Government Efficiency, or DOGE, began with an ambition to cut as much as $2 trillion from federal spending. Its final public tally claimed approximately $215 billion in savings, only around one-tenth of that original target. A federal audit released this month found billions of dollars in unsupported or inaccurate savings claims, including $27.4 billion associated with contracts that remained active.
The political choices ahead are becoming increasingly difficult. Democrats and economic populists on the left are advocating cheaper housing, healthcare and childcare alongside higher taxes on wealthy Americans. Republicans under Trump have largely protected Social Security and Medicare from politically difficult reductions while supporting tax cuts and increased defence spending, including Trump’s push for a $1.5 trillion Pentagon budget.
Ultimately, stabilising the debt will require some combination of slower spending growth and increased government revenue, according to the CBO. Yet Washington has shown little political appetite for the difficult compromises involved.
For ordinary Americans, the national debt is not a personal bill they must directly repay. Its consequences, however, can increasingly appear through mortgage rates, business financing, taxes, government benefits and inflation.
As the debt burden grows while both Washington and corporate America compete for capital, the fiscal challenge is becoming an increasingly important question not only for economic policy but also for America’s future prosperity and global power.
