The Fiscal Feedback Loop Accelerates

The United States is approaching a debt-service tipping point that is quietly rewriting the arithmetic of fiscal policy. For decades, rising government debt and widening deficits reliably triggered market anxiety and political pressure for retrenchment. That disciplinary mechanism now appears broken. Yields on long-term Treasury bonds have surged since 2022, yet federal borrowing continues to accelerate with no serious congressional effort to restrain spending or raise revenue. The consequence is a slow-moving crisis in which debt-service costs themselves become a primary driver of future debt accumulation.

The mechanics are straightforward but insidious. US gross federal debt has exceeded 100 percent of GDP, and net interest payments on that debt now consume more than 15 percent of federal revenues. The Congressional Budget Office projects that interest costs will exceed USD 1 trillion annually by 2026, making them the fastest-growing category of federal spending. When a government must borrow simply to pay interest on its existing borrowings, the fiscal feedback loop tightens. Each new Treasury auction adds to the stock of debt, which in turn raises future interest payments, which in turn requires still more borrowing. The infusion of stimulus during the pandemic accelerated this dynamic, but the underlying trend predates COVID-19.

This loss of fiscal discipline matters most for the Treasury market, the foundational asset class for global finance. Foreign official holders, notably Japan and China, have reduced their Treasury holdings in recent years, and the Federal Reserve is actively shrinking its balance sheet. With the buyer base narrowing, the US government must rely increasingly on domestic private investors and financial institutions to absorb new issuance. That creates crowding-out risk: higher government borrowing pushes up yields across the term structure, raising costs for corporate borrowers and mortgage holders. The US economy may be able to absorb higher rates for a time, but the compounding of debt service costs eventually undermines the very growth that generates the tax revenue needed to service the debt.

The political dimension compounds the difficulty. Neither major party in Washington shows appetite for the tax increases or entitlement reforms that would materially alter the fiscal trajectory. The debt ceiling has become a theater of brinkmanship rather than a genuine constraint on borrowing. Meanwhile, the dollar’s reserve currency status provides a cushion: foreign investors still view Treasuries as the safest liquid asset, and no alternative bond market offers comparable depth. But that cushion is not infinite. If investors begin to demand a risk premium for holding US sovereign debt, the cost of borrowing could rise sharply and suddenly.

Markets have not yet priced in a US default scenario, but they are pricing in the expectation that elevated deficits are permanent. The term premium embedded in long-term yields, the extra compensation investors demand for holding duration risk, has turned decisively positive in recent months. That is a mechanical response to supply: massive fiscal deficits require the Treasury to issue an enormous volume of long-dated debt, and the market is demanding a higher yield to absorb it.

The oversight mechanism that once forced fiscal restraint is no longer working. The combination of structurally high deficits, rising debt-service costs, and a narrowing buyer base creates a slow-motion crisis that compound interest alone will make harder to resolve. Policymakers have not yet faced a moment of acute market panic, but the cost of delay accumulates daily in the form of higher yields and diminished fiscal space. The US debt trajectory is no longer a warning; it is the reality within which every other fiscal and monetary decision must now be made.