Interest on U.S. debt is becoming a top driver of future deficits, as the sheer size of past borrowing overwhelms the fiscal outlook

Rising interest costs on existing U.S. debt are poised to become a primary driver of future deficits, creating potential “fiscal dominance” that could limit the Fed’s ability to aggressively tighten policy. Public debt surpassed nominal GDP (debt-to-GDP 100.2% as of March 31), and deficits are running above $2 trillion this fiscal year. Interest payments are already near $1 trillion and are projected by the CBO to reach about $2.1 trillion by 2036 as publicly held debt approaches 120% of GDP. Analysts warn this dynamic could encourage higher-for-longer inflation, push yields up, constrain fiscal flexibility (including defense spending), and raise the risk of a debt spiral if interest rates exceed nominal growth. Market implications include upward pressure on real yields and inflation-sensitive assets — a backdrop typically favorable to gold (XAUUSD).