The Speed Of Debt

The national debt crossed $40 trillion this week. But the size of the number isn't nearly as striking as the speed we're adding to it.

Forty trillion is hard to picture. Six weeks isn't.

From 1776 to 1976 — through the Civil War, two World Wars and the Great Depression — the United States accumulated roughly $550 billion in federal debt.

That took 200 years.

This summer, America added roughly the same amount in about six weeks.

And this week, the total pushed past $40 trillion.

The chart makes the acceleration hard to miss. But the more interesting story may be what happened next: with long-term borrowing costs climbing to levels not seen in nearly two decades, the Treasury stepped in Wednesday and doubled the size of its long-bond buybacks.

Here’s how the debt pile got this big and why it’s suddenly getting more expensive to carry...

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Six Weeks, Day By Day?


A quick note on the numbers: $550 billion and roughly $600 billion refer to slightly different endpoints. The debt increase crossed $550 billion around the six-week mark; extending the calculation through Aug. 17 brings the increase to $597.35 billion — effectively $600 billion.

Same trend. A few extra days. Another $47 billion.


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What’s Driving the Pace?

Revenue is genuinely growing — 65% is not a small number.

However… spending is growing faster, at nearly 96%, which is the entire mechanical explanation for why total debt roughly doubled from $19 trillion to $39 trillion over the period Bilello's analysis covers.

This isn't a revenue collapse story. It's a spending-outpacing-everything story.

For fiscal 2026, the gap looks something like this:

$1.33 spent for every $1.00 collected

That works out to roughly $5.6 trillion coming in against $7.4–$7.5 trillion going out.

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📎 This Connects To Yesterday’s Treasury Story

Yesterday, Treasury doubled its long-dated bond buybacks after the 30-year yield climbed to a 19-year high.

By Aug. 18, the 10-year yield was at 4.71% and the 30-year at 5.28% — right around the levels that prompted Treasury to step in.

The move wasn’t really about crossing $40 trillion.
It was about what comes with it: more borrowing, more bonds to sell, and investors demanding more to hold them.

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A Few Stats

Big numbers get easier to understand when you divide them by people.

$116,480 Debt per American every man, woman and child
$295,494 — Debt per U.S. household
~$280,000+ — Debt per taxpayer — spread across roughly 140 million filers
~$466,000 — The equivalent for a family of four

And then there’s the speed.

Over the past year, the national debt grew by an average of roughly:

$91,549 per second
$5.49 million per minute
$329.58 million per hour
$7.91 billion per day

For perspective, the per-person share was roughly $40,900 in 2010. Today, it’s above $116,000 — nearly tripling in 16 years.


Interests > Defense Spending


BofA Projections:

And This Is Where It Gets Personal
Higher government borrowing can affect the rates you pay.

In simple terms: when the government needs to borrow more, it has to sell more Treasury bonds. To attract enough buyers, those bonds may need to offer higher yields.

Those yields influence borrowing costs across the economy, so the effects can eventually reach mortgages, car loans, business loans and other credit.

Higher yields also push down the value of existing bonds — one reason the broader bond market is already down roughly 2.5% in 2026.

The odometer is still running. The bigger question is what happens if the recent pace continues.

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