US National Debt Crosses $40 Trillion as Interest Costs Top $1 Trillion

The U.S. national debt crossed $40 trillion this week, breaching a threshold that economists once considered theoretical. The Treasury Department confirmed that the total public debt outstanding reached $40 trillion on August 19, 2026, marking the first time the figure has surpassed this milestone.

The pace of growth has alarmed fiscal watchdogs. The debt rose from $39 trillion just five months ago in March 2026, and the gap between government spending and tax revenue now totals more than $2 trillion per year. The government continues to add debt at a rapid clip, as spending outstrips revenue by more than $2 trillion a year.

The federal government is spending more than a trillion dollars a year just to pay interest on the mounting debt. Interest is now the government’s second-biggest expense, trailing only Social Security, the Treasury Department reported in its daily financial update.

Bond markets react

The yield on the 30-year Treasury moved higher this week, settling at 5.19 percent — its highest level since 2007. That rate directly influences mortgage costs for Americans buying homes. The average rate on a 30-year fixed mortgage climbed to 6.75 percent, according to Freddie Mac’s weekly survey.

$40 trillion should be a wake-up call, said Carolyn Bourdeaux, executive director of Concord Action, a fiscal responsibility advocacy group. But neither Congress nor the president have a credible plan to stop it from growing. We owe the next generation better than this crushing debt and another hollow promise that someone else will deal with it later.

A widening gap with real consequences

Our current fiscal trajectory is plainly unsustainable, and that’s the best-case scenario, said Margaret Spellings, president of the Bipartisan Policy Center. Even in the rosiest scenarios, we’re speeding toward a cliff and refusing to turn the wheel.

The deficit swelled after the Supreme Court struck down many of the Trump administration’s import tariffs earlier this year, forcing the Treasury to refund more than $100 billion in duties that had been collected. Government revenues did grow 3 percent this fiscal year, but spending climbed faster.

Interest costs rose 15 percent in the first ten months of the fiscal year compared to the same period last year. Those higher borrowing costs reflect not only the growing debt burden but also investor demands for compensating yields in an uncertain market. The debt-to-GDP ratio has worsened since the current administration took office.

For households, the impact is visible at the mortgage counter and the car dealership. As the government borrows more, the pool of available capital tightens, making every dollar of new debt marginally more expensive than the last.

Primary source: U.S. Treasury – Daily Statement of Public Debt | U.S. Treasury – Debt Limit Data | NPR coverage of $40 trillion milestone