America’s $40 Trillion Debt Milestone Is Coming Earlier Than Expected. Interest Costs Are Surging.

The U.S. national debt is on track to cross $40 trillion this week, reaching the milestone months earlier than previously expected as Washington borrows at a faster pace and the cost of financing that debt climbs to levels not seen in nearly two decades.

The acceleration comes partly from an unexpected drop in federal revenue after the Supreme Court struck down President Donald Trump's "Liberation Day" tariffs, according to a Washington Post report. The ruling eliminated an estimated $250 billion in anticipated revenue, adding pressure on the Treasury Department to borrow more money to cover government expenses.

The numbers have moved quickly. Just six months ago, the nonpartisan Congressional Budget Office projected federal borrowing would reach about $39.4 trillion by the end of the fiscal year. Treasury data released Monday showed the national debt had already climbed to $39.9 trillion.

The yield on the 30-year Treasury surged Tuesday to its highest level in nearly two decades. Bond yields have been pushed higher by a combination of concerns over inflation, the war in Iran and expanding government debt around the world. They decreased on Wednesday after the Treasury said it will more than double the size of government debt repurchases.

Before the announcement, annual interest payments on the national debt were projected to exceed $1 trillion this year, according to the CBO, putting them roughly on par with the size of the Pentagon's budget.

Interest expenses already consume about 19% of federal revenue, according to the Peter G. Peterson Foundation. That share is projected to rise to 26% by 2036 if current trends continue. The faster pace of borrowing is also bringing Washington closer to another politically explosive debt ceiling fight. Congress raised the legal borrowing limit to $41.1 trillion last year.

Preliminary projections from the Bipartisan Policy Center indicate the government could reach that limit between late winter and midsummer 2027, with the latest borrowing figures pushing expectations toward the earlier part of that range.

President Trump has already urged lawmakers to act. Late last month, he called on the Senate to address what he described as the "ever looming Debt Ceiling disaster" before lawmakers left Washington for the August recess. Senate Majority Leader John Thune acknowledged that Congress would eventually have to confront the issue. "$40 trillion in debt, seems to me that should get our attention," Thune said.

Reaching the debt ceiling would not immediately cause the United States to default. Treasury can temporarily continue paying the government's obligations by drawing down cash reserves and using accounting maneuvers known as "extraordinary measures." Those steps typically provide another six to nine months, according to the Bipartisan Policy Center.

But once those options are exhausted, Washington reaches the so-called X-date, when Treasury could run out of sufficient cash to meet all of its obligations. The CBO estimated in February that the gap between federal spending and revenue would approach $2 trillion this year. The Supreme Court decision days later removed an additional source of expected tariff revenue, while Treasury has also increased borrowing to rebuild its cash reserves.

The Republican-backed One Big Beautiful Bill Act, signed by Trump in July 2025, raised the debt ceiling by $5 trillion. But rather than reducing future deficits, the legislation is projected to add approximately $4.7 trillion to them over a decade, according to CBO estimates.

The White House says its economic strategy will ultimately improve the country's fiscal position. "The Trump administration remains focused on slashing waste, fraud, and abuse across the federal government while accelerating economic growth," White House spokesman Kush Desai told The Washington Post, arguing those policies would move the debt-to-GDP ratio in the right direction.