U.S. Growth Must Outrun Rising Borrowing Costs to Avoid Debt Spiral
The U.S. economy has stayed strong despite tariffs and war-related shocks, prompting the Federal Reserve to raise rates to fight inflation. That has pushed Treasury yields higher, making it harder to service $40 trillion in federal debt. Growth must stay above borrowing costs to prevent debt from expanding faster than the economy.
Despite tariffs and conflict-related shocks, U.S. output has remained vigorous, prompting the Fed to tighten policy to contain inflation. That move has lifted Treasury yields, increasing the cost of carrying roughly $40 trillion in federal obligations. Real growth near 2% trails nominal growth above 6%, while the 10-year yield recently stood at 5.16% after climbing over a percentage point since the Iran war began.
AI-related capital spending is a major driver: six large firms are projected to invest $870 billion this year, up from $470 billion in 2025, with S&P Global expecting hyperscaler outlays above $1.3 trillion by 2027. This spending is spreading to industrial companies, and the $2 trillion annual deficit adds further demand.
If borrowing costs stay near or above economic growth, the federal debt could expand faster than the economy. That may pressure public finances, potentially affecting taxpayers, borrowers, retirees, and investors through higher rates, market swings, or reduced fiscal flexibility. Businesses tied to AI investment could also slow spending if financing becomes costlier. The ultimate social impact depends on whether growth, productivity, and inflation trends keep debt servicing manageable.