The US debt spiral is underway. Markets just haven't priced it in yet

The US has reportedly entered a debt spiral, with the recently passed "One Big Beautiful Bill Act" projected to add $3.4-$4 trillion to the deficit over the next decade, pushing federal debt to $37 trillion and annual interest payments soon exceeding $1 trillion. Despite these figures and a debt-to-GDP ratio of 124%, bond markets remain largely calm, though some shift to short-duration assets is noted. This structural debt phase, compounded by an aging population and the Federal Reserve's limited capacity to intervene due to persistent inflation, poses significant long-term risks across US assets (bonds, stocks, USD), with the potential for rapid yield spikes if investor confidence in fiscal sustainability erodes.

Analysis

The US fiscal position has entered a precarious structural phase characterized by a self-reinforcing debt spiral, where interest costs are outpacing economic growth. The passage of the "One Big Beautiful Bill Act" is projected to add between $3.4 trillion (CBO) and $4 trillion (CRFB) to the deficit over the next decade, exacerbating a federal debt load that has reached $37 trillion, or 124% of GDP. Annual interest payments are on track to exceed $1 trillion, surpassing the entire US defense budget. Despite these metrics, which are the most severe since World War II, bond markets have shown a muted reaction, with yields rising only moderately. However, early signs of investor repositioning are visible, with Q2 2025 data showing $11 billion in outflows from long-term bond funds and $39 billion in inflows to short-duration instruments. The market's relative calm appears to be based on an assumption of Federal Reserve intervention, a premise that is increasingly questionable. Unlike past crises, the Fed's ability to suppress yields via quantitative easing is severely constrained by persistent inflation and already elevated interest rates, creating a direct conflict between fiscal support and price stability. Compounding the issue is a lack of political will for fiscal consolidation, as the new legislation's tax cuts are not credibly offset by future spending cuts, a pattern consistent with the limited economic benefits seen from the 2017 tax cuts.

Key Decisions for Investors

• Given the escalating risk of a sharp rise in long-term bond yields, investors should review their fixed-income duration, potentially shortening exposure in favor of instruments less sensitive to interest rate shocks.
• Monitor for signs of eroding foreign demand for US Treasuries and shifts in investor confidence, as these are the primary catalysts that could trigger a sudden repricing of risk across all US asset classes, including equities and the dollar.
• Re-evaluate portfolio assumptions that rely on imminent and significant Federal Reserve rate cuts, as the growing fiscal burden may compel the central bank to maintain a higher-for-longer interest rate policy to counteract inflationary pressures.
• Factor in a persistently higher baseline for US sovereign risk when valuing domestic assets, as the structural nature of the deficit and political disinterest in austerity suggest these fiscal pressures are not temporary.