Lila Soto: Iris, hey — I had this weird moment yesterday, I was just checking something mundane, some government data thing, and I ended up on the U.S. Treasury Department's daily debt page by accident.
Lila Soto: As one does! And I just — I sat there. Because the number I was looking at, $40.047 trillion, August 18th, 2026, it didn't feel real. Like it genuinely broke something in me scale-wise. But here's what actually got me — it wasn't even the $40 trillion. It was the interest line.
Iris Holm: The $1.21 trillion figure.
Lila Soto: Yeah — annualized interest costs. More than the entire U.S. defense budget, which runs about $1.17 trillion. And I keep thinking about what it would feel like to be a Treasury analyst whose job is literally to watch this number every single morning. She's not alarmed by $40 trillion because she's seen it coming. What she notices is that the interest line has been sitting above defense spending continuously since 2024.
Iris Holm: Hold on — that's not a projection the CBO made. That's already the current fiscal reality.
Lila Soto: That's the present tense version, yes. And that's — I mean, that's what makes it feel less like a crisis and more like a trap we already walked into. The debt crossed $40 trillion during economic growth. Not a recession, not a war emergency that explains away the math.
Iris Holm: Which means the rate increases did this. Not a downturn.
Lila Soto: And that rate thing is actually where the 'how we got here' story gets — I mean, it's not the story people tell themselves. The story people tell is recession, emergency, spend. But look at the receipts across both parties. Trump takes office in January 2017, debt is $19.95 trillion. Biden leaves, it's somewhere around $36 trillion. Trump's second term alone adds another $3.8 trillion and we're not even a year and a half in.
Iris Holm: $11.6 trillion across both Trump terms combined. That's the full tally.
Lila Soto: Which is — yeah, more than Biden's $8.4 trillion. But neither number is the villain. The pandemic alone, two years of borrowing, accounts for roughly a third of everything added since 2017. That cuts straight across administrations. There's no clean door to pin this on.
Iris Holm: So this isn't a partisan story.
Lila Soto: Fingerprints on both sides of the door. Think of it — okay, imagine a household. Every few years, new person managing the checkbook, and every single one takes out a bigger mortgage. Different reasons. Tax cuts one cycle, COVID recovery, infrastructure, clean energy subsidies the next. But the mortgage keeps growing regardless of who signed it.
Iris Holm: And the $30 trillion mark — we crossed that roughly four and a half years before we hit $40 trillion. The pace accelerated.
Lila Soto: That's the part that actually unsettles me more than the number itself. Not that we're at $40 trillion. It's that the gap between $30 and $40 trillion closed faster than the gap before it.
Iris Holm: Maya MacGuineas at the Committee for a Responsible Federal Budget put it plainly. The debt 'finds its way to the pocketbooks of people one way or another.' That's not a projection. That's a mechanism.
Lila Soto: And that mechanism is already running. The 2025 tax cuts, the spending commitments — that's why we're on track to borrow more than $2 trillion in this fiscal year alone. The checkbook doesn't balance regardless of which party's signature is at the bottom.
Iris Holm: And that's the mechanism that actually breaks the math — not the headline number, but the rate on the debt itself.
Lila Soto: Right, because — okay, so picture a bond trader in Tokyo, middle of her night, repricing U.S. Treasuries after a hot inflation print. She's not thinking about $40 trillion. She's moving the yield. And that yield is what the Federal Reserve's rate cycle already locked in: average interest rate on the federal debt went from roughly 1.5% in 2021 to over 3% by 2026. That's not a blip — that's the whole cost of carrying the debt just doubling.
Iris Holm: Wait — the rate doubled while the debt itself was still growing.
Lila Soto: That's the trap part. And Charles Schwab flagged exactly this — it's self-reinforcing. Higher rates widen the deficit, wider deficits mean more borrowing, more borrowing can pressure rates further. Debt-service crowding out, but the loop feeds itself.
Iris Holm: And the CBO is projecting — what, $16 trillion in interest payments over the next decade total?
Lila Soto: Roughly $16 trillion through their projection window, yeah. Which means interest payments more than double from here. And this year alone we're borrowing over $2 trillion — about half of that deficit is just... servicing what we already owe. We're taking out new loans to pay the interest on old ones.
Iris Holm: That's not a budget. That's a balance transfer.
Lila Soto: And the part that comes next — I mean, when we get to what DOGE-style cuts can actually touch versus what's eating the budget whole — that's where the fiscal space question gets genuinely uncomfortable.
Iris Holm: The question is what gets cut when the interest line keeps climbing. That's not abstract anymore.
Lila Soto: But the DOGE framing is what breaks that open, because — okay, so the Department of Government Efficiency ordered these agency cuts, real cuts, jobs gone, programs trimmed. And politically it reads as: we're doing something. Except discretionary spending is roughly 12, maybe 13 percent of a $7 trillion budget.
Iris Holm: While mandatory programs — Social Security, Medicare, Medicaid, veterans' care — sit at roughly 60 percent. And grow automatically.
Lila Soto: DOGE doesn't touch those. At all.
Iris Holm: So what does the math actually look like? Even a 20 percent cut to discretionary — which is politically impossible — clears maybe $30 to $40 billion annually. Interest costs are growing by hundreds of billions per decade.
Lila Soto: It's structural theater. And the CRFB has been explicit — market tolerance for U.S. debt isn't unlimited, and every year we defer the mandatory side, the fiscal space for the next emergency shrinks. Like, imagine a contractor in Phoenix, November 2026, refinancing her mortgage to cover payroll. Rates haven't moved down. The Federal Reserve's held them elevated partly because federal borrowing keeps flooding the bond market. She signs the papers, the rate's brutal, and she's never once read a Treasury debt report.
Iris Holm: She felt the $40 trillion at closing.
Lila Soto: That's the transmission mechanism. And the fiscal space piece — I mean, that's what scares me most. When the next recession hits, the government's capacity to respond is already narrower because interest costs have pre-spent the room.
Iris Holm: The tools get smaller every year we don't touch mandatory spending. And DOGE is pointing at the wrong shelf entirely.
Lila Soto: Which opens the question of what actually has to give — and whether any political coalition exists that could touch it.
Iris Holm: The question is whether that coalition ever forms before the bond market just... decides for them. CRFB has been saying exactly that — persistent deficits plus higher rates is already constraining what's politically possible. Not in ten years. Now.
Lila Soto: And that's the image that sticks with me. Not a congressional hearing, not an election. Just — a Treasury auction where the yield moves and suddenly the room for Social Security adjustments or a defense supplemental or disaster relief, it just... got smaller. Nobody voted on that. The bond market did it.
Iris Holm: Which is what MacGuineas meant. It finds its way to pocketbooks one way or another. Doesn't wait for the vote.
Lila Soto: I keep thinking about that Treasury analyst — the one I imagined at the top of this. She's logging off August 18th, 2026, $40.047 trillion on the screen, and the thing she actually knows, that I didn't fully get when I stumbled on that page, is that the number tomorrow will be higher. It's not a milestone. It's a direction.
Iris Holm: That's an uncomfortable place to land. But it's the honest one.
