Interest on the national debt is eating a record 19% of federal revenue — and watchdog warns it will get worse

30-year Treasury yields have surged to 5.19%–5.198%, and CRFB warns that if elevated rates persist, federal interest costs could rise from $880 billion today to $2.5 trillion by 2036. Interest expense already hit 3.25% of GDP and about 19% of federal revenue in FY2025, with the share of revenue potentially nearing 30% under the high-rate scenario. The article argues this would intensify a debt spiral, lift borrowing costs across mortgages and business loans, and crowd out other federal spending.

Analysis

The key second-order effect is not just higher Treasury expense; it is the migration of duration risk from the sovereign into every domestic asset class that prices off the long end. Banks, REITs, homebuilders, utilities, and levered growth all face a common denominator shock: the hurdle rate for capital allocation rises faster than nominal revenues, which compresses multiples even if earnings hold up. That argues for treating this as a cross-asset discount-rate regime shift, not a one-off rate move.

The market’s bigger blind spot is fiscal inertia. If interest expense is already crowding out discretionary spending, the marginal political response is more likely to be issuance-heavy and growth-negative than truly credible consolidation, which reinforces term premium. Over months, that favors a steeper curve and persistent pressure on long-duration equities; over years, the compounding becomes self-referential as larger deficits force more supply into a thinner bid.

For banks, the setup is mixed but not benign. BAC-type money centers can look insulated because deposit beta lags, yet a 30-year yield above 5% tends to reprice mortgage origination, slow refi volume, and tighten CRE financing conditions, which eventually bleeds into credit quality. The more important trade is that higher-for-longer yields can hurt the very asset categories banks carry as collateral and mark-to-model stabilizers, increasing tail risk even if near-term NII appears durable.

The contrarian view is that consensus may be overconfident about a clean inflation re-acceleration story; the more durable driver may be supply of duration and fiscal credibility. If term premium is the main culprit, any surprise on deficit restraint or a more orthodox Fed chair could trigger an outsized rally in the long bond because positioning is likely crowded against duration. That creates asymmetry: the bear case is slow grind, but the bull case is a violent squeeze if auction demand stabilizes or fiscal rhetoric shifts.

Key Decisions for Investors

• Short IWM vs long SHY or TLT put spreads: express the view that higher discount rates punish smaller-cap, domestically financed companies more than cash-rich megacaps; target 3-6 months with asymmetric downside if 30Y stays above 5%.
• Buy XHB or ITB puts for 1-3 months: housing affordability is the cleanest transmission channel from long-end yields to real economy demand; risk/reward improves if mortgage rates stay elevated and purchase applications roll over.
• Reduce exposure to rate-sensitive levered equity baskets (VNQ, XLU) and rotate into short-duration cash-flow names; the trade is less about recession and more about multiple compression from a persistently higher terminal rate.
• Consider a curve-steepener via long 2Y / short 30Y Treasuries or options on the 2s30s spread: fiscal supply and term premium can keep the back end under pressure even if growth weakens, with better payoff if auction tails continue.
• Avoid treating BAC as a pure beneficiary of higher rates; if held, hedge with puts or pair against a less credit-sensitive financials basket, because mortgage and CRE second-order effects can show up with a lag of 2-4 quarters.