Latest / The National Debt Podcast with Fexingo: Treasury, Borrowing, and Long-Term Fiscal Outlook / The Silent Tax of Rising Debt Service Costs
Transcript
- Lucas: We need to talk about the quietest line item in the federal budget because it’s suddenly become the loudest one: interest on the debt. The total national debt just crossed thirty-nine trillion dollars, but the headline number doesn’t tell the whole story. What’s actually happening is that the cost of servicing that debt is accelerating faster than the principal itself. Luna: Right, and with the ten-year Treasury yield sitting at four point seven seven percent, that math is getting brutal for the Treasury Department every single quarter. Lucas: Exactly. Look at the data from the start of this year. The federal deficit was around one point seven seven trillion dollars, but if you strip out interest payments, the underlying structural deficit is significantly smaller. We are essentially borrowing money just to pay the interest on money we borrowed last year. It’s a compounding loop that most listeners don’t see because it’s buried in the general fund. Luna: It feels like we’re entering an era where debt service is no longer a background cost but a primary driver of fiscal constraint. Lucas: That’s the shift. Ten years ago, when rates were near zero, interest was a rounding error. Today, with the Fed Funds rate flat at three point six three percent but market yields higher, the government is paying a premium for liquidity. The spread between the two-year and ten-year notes has narrowed to forty-one basis points, which tells us investors are worried about short-term inflation risks pushing those borrowing costs even higher. Luna: So if inflation ticks up again, that tight spread could invert quickly, spiking the cost of new issuance right when we need it most. Lucas: Precisely. And here is the concrete detail that matters: debt service is now eating up roughly twenty percent of all federal tax revenue. That means for every dollar collected in income tax, twenty cents goes straight to bondholders before we pay for defense, healthcare, or infrastructure. It’s a direct transfer of wealth from taxpayers to creditors, and it limits our policy flexibility. Luna: Twenty percent is a staggering amount of discretion lost. Does that force the government to cut other programs, or do they just borrow more to cover the gap? Lucas: They do both, which is the trap. If they cut spending, they risk slowing economic growth, which reduces tax receipts further. If they borrow more, they increase the principal, which increases future interest. It’s a classic fiscal dominance scenario. The Federal Reserve is caught in the middle too, trying to manage inflation while keeping rates low enough to keep debt service manageable. Luna: But can the Fed really keep rates low if inflation comes back? They’d have to hike aggressively, which would make the debt problem worse. Lucas: That’s the dilemma. We saw some volatility this week with the thirty-year yield dipping slightly to five point two five percent, but the pressure is still there. Every time the FOMC talks about rates, the market reacts because everyone knows the government is the biggest borrower in the world. They can’t afford high rates without defaulting on their own promises, but they can’t afford low rates if inflation runs hot. Luna: It’s like walking a tightrope while carrying a heavy backpack. One slip and everything collapses. Lucas: A better analogy might be driving a car while refueling it. You’re moving forward, but the cost of the fuel is rising faster than your speed. The thirty-year Treasury is basically the long-term view of that fuel cost. At five point two five percent, that’s expensive capital for any long-term project, whether it’s a bridge or a national infrastructure plan. Luna: So private investment suffers too because the government is competing for the same pool of capital at higher prices. Lucas: Absolutely. This is what we call crowding out. When the government absorbs so much credit capacity, corporate borrowers face higher rates. Small businesses struggle to expand. Innovation slows down because the cost of capital is structurally higher. It’s not just a political issue; it’s a macroeconomic drag that affects your local economy directly. Luna: I wonder if people realize that their mortgage rates are partly influenced by this dynamic, not just Fed policy. Lucas: They absolutely should. Mortgage rates are tethered to the ten-year Treasury. So when the Treasury has to offer a higher yield to attract buyers because the debt load is scary, mortgages go up. It’s a direct pipeline from Washington to your monthly housing payment. The link is real and it’s immediate. Luna: That makes it very personal. It’s not just abstract numbers on a screen; it’s the cost of living. Lucas: It is. And we have to ask ourselves: what is the sustainable path forward? Some economists argue for monetizing the debt, letting the Fed buy Treasuries to keep rates down. But that’s inflationary. Others argue for austerity, cutting spending to reduce the deficit. But that’s politically toxic and recessionary. Luna: So we’re left with the third option: hoping for hyper-growth. If the economy grows fast enough, the debt to gdp ratio stabilizes even if the nominal debt keeps rising. Lucas: That’s the only way out that doesn’t involve pain. If GDP grows at four or five percent annually, the relative burden of the debt shrinks. But we aren’t seeing that kind of growth right now. We’re seeing stagnation mixed with inflation. That’s the worst case scenario for debt sustainability. Luna: Stagnation plus inflation is stagflation. And stagflation is terrible for bondholders because it erodes the real value of their returns. Lucas: Right. So bondholders are demanding higher yields to compensate for that risk. That pushes the ten-year yield up, which pushes the cost of borrowing up, which widens the deficit. It’s a vicious cycle. The only break in the cycle is either a massive productivity boom or a severe correction that forces fiscal discipline. Luna: A severe correction sounds painful, but maybe necessary to reset expectations. Lucas: Maybe. But history shows that governments rarely volunteer for that correction. They usually wait until the market forces them. And when the market forces them, it’s messy. We’ve seen it in Europe, we’ve seen it in emerging markets. The U.S. has the privilege of the dollar’s reserve status, but that privilege isn’t infinite. Luna: There’s always a limit to how much trust can be stretched. Once it snaps, the adjustment is violent. Lucas: Exactly. So for investors and citizens alike, the takeaway is simple: watch the interest expense line. It’s the canary in the coal mine. If it starts climbing faster than revenue, the system is under stress. And right now, it is climbing. Luna: It’s a warning sign that’s easy to ignore until it’s impossible to ignore. Lucas: Hard to ignore when it’s eating twenty percent of your tax dollars. We’ll keep tracking these numbers as we move through Q4. The trajectory is clear, even if the destination is uncertain. Luna: And that uncertainty is exactly what keeps the bond market on edge every single day. Lucas: If walking through the economy with us has made something click, consider supporting the show directly. We deliberately don't run ads on these episodes to keep the focus purely on the data and the analysis. If you want to support that choice, the link is buy me a coffee dot com slash fexingo. Luna: Your contribution helps us keep digging into these complex topics without commercial interference. Lucas: Thanks for listening. As we look ahead to the next quarter, the question isn't just whether the debt will grow, but whether the cost of carrying it will finally force a change in policy.