The US national debt is set to surpass $40 trillion this week, months earlier than forecasters had expected, as faster borrowing reflects both the government’s widening fiscal gap and billions of dollars in lost revenue following the invalidation of President Donald Trump’s tariffs.
The acceleration has consequences beyond the symbolic milestone. It is also bringing forward the next confrontation over the legal limit on US borrowing, raising the prospect of another politically charged battle in Washington over whether the government can continue borrowing to meet obligations already incurred.
As of Aug. 14, 2026, the US public debt stood at $39.93 trillion. Six months earlier, the nonpartisan Congressional Budget Office had projected that total borrowing would reach $39.4 trillion for the fiscal year. Treasury’s latest figure, reported on Monday, showed that the debt had already reached $39.9 trillion and was continuing to rise.
The difference reflects a faster pace of borrowing than previously anticipated. This year, the gap between federal spending and revenue was already expected to approach $2 trillion, according to the CBO’s February assessment. Days later, the US Supreme Court struck down Trump’s “Liberation Day” tariffs, reducing federal revenue by an estimated $250 billion. Treasury has also increased borrowing recently to build up its cash reserves.
The immediate fiscal pressure comes against a much longer history of rising US debt. Over the past quarter-century, the national debt has increased under both Republican and Democratic administrations, through the tax cuts of the George W. Bush era, the wars in Iraq and Afghanistan, the Great Recession, the 2017 Trump tax cuts and the nearly $2 trillion Biden administration initiative to support the economy during the coronavirus pandemic.
Trump had pledged during his first campaign in 2016 to eliminate the debt within eight years. Instead, the debt has doubled since he first took office.
The next statutory threshold is now coming into view. Congress last year set the debt limit at $41.1 trillion. Preliminary projections by the Bipartisan Policy Center indicate that Washington is on track to reach the limit between late winter and midsummer 2027. Based on the latest borrowing figures, the estimate is “trending toward the earlier end” of that range, according to Shai Akabas, the centre’s vice president of economic policy.
Trump is already pressing lawmakers to address the issue. Late last month, before the Senate left for its August recess, he urged senators to confront “the ever looming Debt Ceiling disaster”. Senate leaders did not comply, although Majority Leader John Thune (R-South Dakota) said at the time that “we’ll have to be dealing with it”. He added: “$40 trillion in debt — seems to me that should get our attention.”
Reaching the debt ceiling would not immediately mean that the United States had defaulted. Once the limit is reached, the Treasury can continue paying bills by drawing on its cash reserves and employing temporary accounting measures known as “extraordinary measures”. According to the Bipartisan Policy Center, these measures typically provide another six to nine months. Only after they are exhausted would the government reach the so-called X-date, when the Treasury risks running out of cash and defaulting on its obligations.
The political timing could make the approaching deadline particularly consequential. If Republicans lose one or both chambers of Congress in the Nov. 3 midterm elections, they could seek to raise the debt limit during the lame-duck period in November and December, before the new Congress takes office in January. Otherwise, Republicans could face pressure to make concessions to Democrats that both the party and the White House would prefer to avoid.
Even unified Republican control would not necessarily make the process straightforward. In the House, where Republicans hold a slim majority, party leaders could face opposition from fiscal hawks who have previously resisted increases in the debt ceiling unless they were accompanied by agreements to reduce spending.
The last increase was comparatively quiet. Congress added $5 trillion to the debt ceiling as part of the One Big Beautiful Bill Act, the Republicans’ major tax and spending law, signed by Trump in July 2025. Debt-limit increases have often been paired with spending reductions intended to address the annual budget deficit. But the legislation moved in the opposite direction, with CBO estimates showing that it added $4.7 trillion to projected deficits over the following decade.
The growing cost of servicing the debt is adding another layer of pressure. Last week, the US government sold 30-year bonds at 5.216 per cent, the highest rate in a quarter-century, according to Bloomberg News. Treasury rates influence borrowing costs across the economy, including mortgages and corporate debt.
Annual interest payments on the federal debt are projected to exceed $1 trillion this year, according to the CBO, roughly the size of the Pentagon budget. The Peter G. Peterson Foundation estimates that interest payments now consume about 19 per cent of federal revenue and projects that figure to rise to 26 per cent by 2036.
Michael Peterson, chief executive of the Peterson Foundation, described the growing interest burden as a consequence of previous borrowing rather than an investment in future needs. “Interest costs are paying for your past, not paying for your future,” he said, arguing that the burden would fall unfairly on future generations.
The broader fiscal outlook is also attracting warnings. Military spending connected to the conflict with Iran could add further pressure to the debt in the months ahead, according to the Bipartisan Policy Center. Its president and CEO, Margaret Spellings, said: “Our current fiscal trajectory is plainly unsustainable, and that’s the best-case scenario.” She warned that AI disruption, a recession, global war or other events could turn the existing challenge into a crisis.
The White House maintains that the administration is pursuing a different approach. White House spokesman Kush Desai said the Trump administration remained focused on “slashing waste, fraud, and abuse across the federal government while accelerating economic growth”, with the aim of putting the country’s debt-to-GDP ratio on a better trajectory.
Yet the history of debt-limit confrontations shows the political difficulty of translating competing fiscal priorities into policy. Congress has raised or suspended the limit whenever it has been reached, but often only after intense partisan disputes. Those episodes have had consequences beyond Capitol Hill. Standard & Poor’s, Fitch and Moody’s have each downgraded US government debt since 2011, with debt-ceiling brinkmanship contributing at least partly to those decisions.
The scale of the challenge is reflected in the debt held by the public. According to Federal Reserve Bank of St. Louis data, it stood at 98.7 per cent of GDP in the first quarter of 2026.
Other long-term obligations illustrate the consequences of delay. Peterson pointed to Social Security, whose trust fund is projected to become insolvent in 2032 unless Congress acts, potentially triggering an automatic 22 per cent reduction in benefits.
The approaching $40 trillion milestone therefore represents more than a large number on the Treasury’s balance sheet. It marks another point in a decades-long accumulation of borrowing, while the cost of servicing that debt is becoming an increasingly significant claim on federal revenue. The immediate question for Washington is when the next debt-limit confrontation will arrive. The larger question is whether the political system can address the underlying gap between what the government spends and what it collects.
As Peterson put it: “Can a democracy that’s run by all of us collectively make tough decisions to sacrifice in the short term for long-term benefit?” He said the political system “hasn’t risen to this challenge in recent decades.”
