US debt has hit $40tn - Will that be a wake-up call?

US National Debt Reaches $40 Trillion as Interest Costs Rise

It took nearly 200 years for US national debt to reach $1 trillion for the first time, according to Maya MacGuineas, president of the Committee for a Responsible Federal Budget. That milestone occurred in 1981 and was described at the time by President Ronald Reagan in a televised address as a potential warning signal for the country.

By the United States’ 250th anniversary, annual interest payments on the debt exceed that original $1 trillion threshold. The $40 trillion level was anticipated following increases in public spending during the administrations of Donald Trump and Joe Biden. It coincides with higher outlays on social programs and other expenditures that have exceeded revenues, partly due to prior tax reductions. Additional borrowing occurred in response to the 2008 financial crisis and the Covid-19 pandemic. Recent inflation prompted higher interest rates, which have raised the cost of servicing the debt.

At the start of Trump’s first term in 2016, US national debt stood at just under $20 trillion. The total has doubled over the subsequent decade. The debt increases by approximately $90,000 per second, or $7.8 billion per day, according to the Joint Economic Committee of Congress.

Eric Swanson, professor of economics at the University of California, Irvine, and a former senior economist at the Federal Reserve, noted that long-term interest rates stand at multi-decade highs. He attributed this partly to inflation concerns and partly to the volume of US government borrowing. The bond market has required higher yields as investors assess the scale of federal debt alongside competing demand from technology companies financing artificial intelligence projects.

Mohamed A. El-Erian, an economist and professor at the Wharton School, stated that interest payments on government debt are currently 15 percent higher than in the same period last year and represent nearly 20 percent of tax revenue, exceeding defense spending. The United States is approaching its $41.1 trillion statutory debt limit. The Congressional Budget Office projects the debt will reach approximately $64 trillion by 2036.

Economists indicate the current situation has not reached a critical stage. The size of the US economy and the dollar’s status as the primary global reserve currency provide greater flexibility than many other nations, according to El-Erian. He characterized the outlook as a “flashing yellow light” rather than an immediate crisis. Swanson observed that several other countries, including Japan and Italy, have recorded debt-to-GDP ratios at or above the current US level of 126 percent.

Investor demand for US Treasury bonds has shown signs of weakening, Swanson said, which could require the government to offer higher yields to attract buyers. Elevated US borrowing costs can also influence rates in other countries. Charlie Bean, emeritus professor of economics at the London School of Economics, stated that a sufficiently high debt-to-GDP ratio could trigger large-scale sales of US bonds and associated market disruption, though no precise threshold for such an event has been identified.

Recent economic data show slower growth in recent months, though the economy continues to expand. Growth supports higher tax receipts that can offset spending and interest obligations. El-Erian noted that adequate growth can moderate the debt trajectory. Absent sufficient growth, options discussed by analysts include changes to the tax code, adjustments to public spending, or other fiscal measures. Debt restructuring has also been mentioned as a possible approach.

On 19 August, the Treasury Department announced purchases of existing government securities to support bond demand and reduce yields. The effect proved temporary, with longer-term borrowing costs rising again the following day.

With midterm elections scheduled for 2026, administration officials have emphasized economic performance. Voter surveys list affordability as a leading concern. El-Erian expressed doubt that major deficit-reduction steps will occur in the next two to three years, citing ongoing discussion of tax reductions in political statements.

The debt increase reflects the combined effects of revenue and spending decisions across multiple administrations, responses to economic shocks, and the current interest-rate environment.