The surprising way that America’s $40 trillion debt costs you

A sign displays the national debt at a bus stop in Washington, D.C. on August 20, 2026. | Anna Moneymaker/Getty Images This story appeared in Today, Explained, a daily newsletter that helps you understand the most compelling news and stories of the day.

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America’s national debt cleared $40 trillion for the first time ever on Wednesday, a number so comically large as to feel imaginary.

Seriously — look at it in all of its comma-strewn glory: $40,203,821,194,241 .

And because the US racks up tens of thousands of dollars of new debt every second, that number was outdated even as I typed it.

On some level, the steady ballooning of the national debt is basic math , familiar to anyone with a budget of their own.

The government’s expenses — particularly the costs of Social Security and Medicare — are growing, while successive rounds of tax cuts have reduced the revenue available to cover them.

As the government accumulates more debt, it also has to spend more just to cover the interest.

But national debt also functions very differently from household debt, because a government is very different from an individual or family.

For one thing, it doesn’t have a set lifespan or retirement age, which means it can roll its debt over indefinitely.

For another, government borrowing can boost the economy’s productivity in the future, which changes some trade-offs.

Rising national debt isn’t a big deal if the economy is growing alongside it.

That isn’t the case right now, though…and it hasn’t been for a couple of years.

America’s debt is outpacing its economic growth, with increasingly tangible consequences for your personal finances.