The $39 trillion national debt could break the all-important U.S. bond market, sparking a ‘vicious’ emergency, former Treasury secretary warns

U.S. federal debt has reached $39 trillion, intensifying concerns that Treasury demand could weaken and push yields higher. Former Treasury Secretary Henry Paulson warned that falling foreign demand could trigger a dangerous debt spiral, potentially forcing the Federal Reserve to act as buyer of last resort. The article argues this would raise borrowing costs across the economy and further strain the deficit.

Analysis

The real market risk is not a one-day “Treasury selloff” headline; it is a slow repricing of the term premium that leaks into every duration-sensitive asset class. If investors begin demanding a higher structural risk premium for holding long-duration U.S. paper, the first-order losers are not just bonds but levered balance sheets, rate-sensitive growth equities, housing proxies, and any strategy depending on cheap funding and stable collateral haircuts. The second-order effect is that tighter financial conditions arrive even if the Fed is easing, because the market can do the tightening for it.

The most underappreciated transmission channel is collateral quality and dealer balance-sheet capacity. If Treasuries lose some of their “risk-free” status in marginal pricing, repo costs, margin requirements, and sovereign-collateral substitution dynamics can all deteriorate before the broader public notices, which typically hits basis trades, mortgage spreads, and swap spreads first. That creates a pocket of forced selling in leveraged fixed-income arbitrage and could spill into equities through higher volatility and lower discount-rate support.

The policy backstop is also double-edged: any explicit Fed intervention to absorb supply would likely stabilize nominal yields but weaken the dollar’s credibility premium, steepening the curve and pressuring import-sensitive sectors. In that regime, the winners are hard-asset hedges, inflation-linked duration, and non-U.S. reserve alternatives; the losers are long-duration U.S. growth and domestic cyclicals reliant on abundant credit. The consensus is probably underestimating how quickly a confidence problem can become a liquidity problem in the Treasury market, but also overestimating the odds of an abrupt collapse rather than a persistent, grindier erosion in foreign demand.

Key Decisions for Investors

• Add a tactical long in TLT puts or put spreads (3-6 month tenor) to express rising term premium / duration risk; risk/reward is attractive because a modest 25-40 bps move higher in long-end yields can generate outsized convexity losses.
• Pair trade: short IWM / long XLP or XLU for 1-3 months to hedge a funding-tightening regime; small caps are more exposed to refinancing and floating-rate debt while defensives benefit from lower beta and less dependence on cheap capital.
• Initiate a steepener via 2s10s payer swaptions or long-duration short front-end hedge if the market starts pricing Fed backstop intervention; if the Fed signals support, front-end can stay anchored while the long end sells off on credibility concerns.
• Prefer inflation-linked duration over nominal duration: rotate part of core rates exposure from IEF/TLT into TIP or tip overlays over the next quarter; this protects against a confidence-driven rise in real rates plus any policy monetization optics.
• Avoid adding to levered rate-sensitive credit exposures until Treasury volatility normalizes; BBB financials and mortgage REITs are most vulnerable if repo haircuts or swap spreads widen.