The US national debt crossed $40 trillion this week, the Treasury Department confirmed, a milestone that arrived months earlier than most forecasters had expected and just five months after the government passed $39 trillion in March.
The figure is the government's total gross debt — everything Washington owes to outside bondholders plus what it owes itself, including IOUs held in trust funds such as Social Security. To put the scale in perspective, $40 trillion is larger than the combined estimated value of every single-family home in the United States.
Analysts point to two forces behind the accelerated pace. Deficit spending tied to the 2009 financial crisis and the 2020 pandemic left a structurally larger debt base, while more recent tax cuts have reduced federal revenue even as both parties in Congress have kept spending elevated. Lost revenue from tariffs that courts have since invalidated also widened the gap faster than budget office projections anticipated earlier this year.
Interest bill now bigger than defense spending
The cost of simply servicing the debt has become one of the fastest-growing lines in the federal budget. The Committee for a Responsible Federal Budget notes that interest payments on the debt are now larger than what the government spends on national defense or on Medicare, a threshold that budget hawks in both parties have long warned would eventually squeeze out other priorities.
Measured against the size of the economy, the US debt-to-GDP ratio stands at 125.8%, ranking ninth-highest among the world's major economies — behind Japan, Singapore, Sudan, Bahrain, Italy, Greece, Senegal and the Maldives, but well above most other large, developed economies. Independent analysts, including those tracking the country's debt and deficit trajectory, project the total could reach $50 trillion within a few years absent a significant change in fiscal policy — a trend that credit-rating agencies and bond investors have increasingly flagged as a source of long-term strain on Treasury markets.
The White House has not announced new deficit-reduction measures in response to the milestone, and neither party has advanced a plan to significantly narrow the annual shortfall ahead of the midterm elections. For now, economists say, the more immediate risk is not a fiscal crisis but a slow rise in borrowing costs across the economy, from mortgages to corporate loans, as investors demand higher yields to keep financing Washington's growing debt load.
