J.P. Morgan Warns Global Interest Rates Will Surge by 2026 as Public Debt Reaches $100 Trillion

A relentless erosion of fiscal discipline paired with an accelerating global demographic decline threatens to push borrowing costs significantly higher through late 2026, according to a recent global economic assessment from J.P. Morgan. The warning comes as combined world debt across sovereigns, corporations, and households ballooned to a record $251 trillion, with public debt alone crossing $100 trillion.

Research led by J.P. Morgan analyst Joyce Chang underscores an emerging macro trend where “fiscal dominance”—a situation where massive government deficits effectively constrain monetary policy—is overtaking central banks’ ability to manage inflation. As governments continue to run elevated deficits without structural cost offsets, sovereign bond markets are demanding higher compensation to absorb the swelling supply of government debt.

Wall Street’s largest lender identified six core structural forces, termed the “six D’s,” that will redefine global macroeconomic stability over the coming decade: deficits, deregulation, de-carbonization, de-population, de-globalization, and de-dollarization. Together, these pressures are diminishing “fiscal space,” reducing the buffer that allows governments to boost spending or adjust taxation without threatening national creditworthiness.

The market reaction to uncurbed government spending is already visible in the bond market’s term premium—the additional yield investors require to hold long-term debt rather than rolling over short-term instruments. When national debt expands rapidly, debt markets reflect heightened default or monetization risks. If central banks are eventually forced to expand money supply to soften sovereign debt burdens, inflation accelerates, eroding real yields further.

While the United States faces expanding deficits and zero political momentum toward fiscal consolidation, its status as the world’s primary safe-haven asset has shielded its domestic economy from immediate disruption. However, J.P. Morgan notes that this advantage relies heavily on geopolitical stability, leaving the outlook vulnerable to unexpected military, energy, or economic shocks that could challenge U.S. financial primacy.

Beyond budget balances, a profound demographic transition is dismantling the economic tailwinds of the past four decades. The historic “demographic dividend”—a period characterized by a surging working-age population that fueled high national savings and kept long-term interest rates low—has effectively run its course across advanced economies. Falling birth rates and rapid population aging are contracting labor pools while expanding non-discretionary commitments for public pensions and healthcare.

This demographic squeeze coincides with growing demands for government funding in defense, energy transition, and infrastructure. In the United States, analysts at the Committee for a Responsible Federal Budget estimate that the trust fund for Social Security faces an automatic benefit reduction cliff in less than eight years, around 2032. Addressing this shortfall would require issuing roughly $600 billion in new debt alongside potential tax increases or spending cuts—a structural issue that J.P. Morgan warns will persistently depress global savings and put upward pressure on equilibrium interest rates beyond 2031, following wider fiscal strains noted by the International Monetary Fund.