US National Debt Hits $38.9 Trillion as Borrowing Costs Mount

The US national debt crossed $38.85 trillion yesterday, adding nearly $29 billion in just one day and climbing 7.3% over the past year. That’s roughly $2.6 trillion in new debt in 12 months — more than the entire GDP of most countries.

Here’s what makes this particularly interesting: we’re adding debt at this pace while interest rates remain elevated. The government is essentially doubling down on borrowing just as the cost of that borrowing has surged. Every new dollar borrowed today comes with a much higher interest payment than the ultra-cheap debt issued during the 2010s. This creates a compounding problem — higher interest expenses require more borrowing, which creates even higher future interest expenses.

The math is getting uncomfortable fast. Federal interest payments now consume roughly 15% of all government revenue, up from around 8% just five years ago. If rates stay elevated, that percentage keeps climbing, crowding out spending on everything else. This is the kind of structural shift that doesn’t reverse easily — once you’re on this trajectory, the options narrow quickly.

Many professional investors are watching this dynamic closely because it creates competing pressures in bond markets. Heavy government borrowing increases the supply of Treasuries, which typically pushes yields higher. But if investors start worrying about fiscal sustainability, they might demand even higher yields to hold US debt — exactly the opposite of what the government needs right now.

Bottom Line: The US is borrowing heavily into a high-rate environment, creating a fiscal feedback loop that gets more expensive by the day. The real question isn’t whether this pace is sustainable — it’s how long markets stay comfortable financing it.

Source: US Treasury Fiscal Data

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