The US is now buried in $40T of debt — but who’s buying the IOUs right now? Here’s the unsettling answer for Americans

Moneywise and Yahoo Finance LLC may earn commission or revenue through links in the content below.

The U.S. just crossed a number so large it barely registers anymore: $40 trillion in debt.

To put that in perspective, it took the country over 200 years to hit its first trillion in debt. Now Washington adds that much roughly every 100 days.

Jeff Bezos backs a platform that lets anyone invest in rental homes for as little as $100 — 6 ways to build wealth like a landlord without actually being one

JPMorgan sees gold hitting $5,000/oz by Q4 — and savvy investors are protecting their wealth with a tax-advantaged Gold IRA. Get your free guide from Priority Gold

The tax breaks in Trump's 'big beautiful bill' expire after 2028. Here are 4 moves to make before the window closes

To fund it, the Treasury doesn't send out a single invoice. It sells the debt off in pieces — a bill here, a note there, a 30-year bond, auctioned off in a room most Americans have never heard of, to buyers most Americans have never met.

For decades, the story of who bought that paper was simple. Japan bought it. China bought it. Oil-rich Gulf states bought it, recycling their petrodollars into the world's safest asset.