The US national debt milestone of $40 trillion has arrived, and by most accounts it was entirely predictable. The United States crossed the threshold for the first time in its history, a figure the New York Times described as ‘an ominous milestone for an economy that sits on a shaky fiscal foundation after decades of borrowing to pay for the rising costs of the military, social safety net programs and President Trump’s tax cuts.’
The Times’s framing is reasonable, if incomplete. Tax cuts, as a principle, are not inherently reckless. What the debt trajectory actually reflects is a bipartisan, multi-decade failure to align revenues with commitments, and Trump’s administration is one chapter in that story, not its author.
The US National Debt Milestone in Context
The U.S. Treasury’s Debt to the Penny dataset tracks total outstanding public debt daily, broken down into intragovernmental holdings and debt held by the public. That public portion now exceeds 100% of gross domestic product (GDP). Gross national debt sits at roughly 123% of GDP.
The Treasury’s Monthly Statement of the Public Debt, updated through July 2026, provides the monthly-frequency detail behind that headline figure, covering data back to January 2001. That starting point matters. Publicly held debt was just 31.5% of GDP in 2001, after four years in which the government ran budget surpluses, according to the Wall Street Journal. Wars, the dot-com bust, tax cuts, the 2007-09 recession, and then the pandemic each accelerated the trajectory. An ageing population has since pushed Medicare and Social Security costs steadily higher.
The United States will borrow $2 trillion this year alone. As the Wall Street Journal noted, even surrendering the entirety of Elon Musk’s approximately $1 trillion net worth would ‘barely make a dent.’
Structural Pressures and the Risk to the Dollar
The long-term concern is not simply the number itself but what it signals to bond markets. The New York Times warned that mounting debt ‘could lead investors to demand higher interest rates for U.S. bonds or raise questions about the nation’s creditworthiness, which could erode confidence in the dollar as the world’s reserve currency.’
That pressure is already visible in the tension between monetary and fiscal policy. The new Federal Reserve chair, Kevin Warsh, has emphasised reducing forward guidance and restoring market independence. Meanwhile, the Treasury secretary has been focused on holding down long-term yields, including through bond buybacks. Those objectives are not easily reconciled.
Medicare and Social Security sit at the heart of the structural problem. Both programmes consume a large share of the federal budget, and both are politically resistant to reform. When European governments have attempted to raise retirement ages, the public response has been swift and hostile. There is no evidence the United States would respond differently.
From Federal Coffers to City Budgets
The fiscal logic at the federal level has filtered down to every tier of government. New York City Mayor Zohran Mamdani launched what he called the city’s first-ever Parents’ Night Out programme in July, offering free supervised childcare so parents could spend an evening without worrying about cost. ‘Every parent knows that a few hours to yourself can feel like a luxury,’ Mamdani said. ‘It shouldn’t be.’
A single evening of subsidised childcare will not strain a city running a $127 billion budget, up almost $30 billion from former Mayor Eric Adams’s first budget four years ago, in a city of 8.5 million people generating close to $82 billion in annual tax revenues. The programme is, in isolation, modest.
The point is not the cost. It is the habit. At every level of government, from Washington’s entitlement programmes to municipal childcare evenings, the expectation that the state will absorb the ordinary costs of life has become normalised. The political rise of the Democratic Socialists of America, which secured multiple primary victories in the current cycle, reflects how durable that expectation has become on the left.
The difficulty is that benefit programmes, once established, acquire constituencies. Even phased Social Security reductions, carefully designed to protect those already reliant on or planning around the benefit, poll badly. The voters who would be unaffected still object.
Elsewhere: Moderna’s Melanoma Vaccine Data
Away from the debt debate, a Moderna-Merck mRNA vaccine candidate showed success in preventing melanoma from recurring or spreading in early studies. Wall Street Journal reported that Moderna shares climbed more than 140% on the news, Merck gained more than 12%, and the two companies were on track to add more than $50 billion in combined market capitalisation.
On immigration, Politico reported that the Trump administration has pulled back on high-profile enforcement raids ahead of the midterm elections, now fewer than 90 days away. Despite the lower profile, polling shows half of Americans, including nearly a quarter of Trump’s 2024 voters, still regard the mass deportation campaign as too aggressive.
The debt clock will keep running regardless of which party wins those midterms. The question is whether either has any intention of doing something about it.
