Net interest expense has now become the federal government’s second-largest spending category, surpassing Medicare and trailing only Social Security. This shift highlights the combined impact of elevated interest rates and years of persistent deficit spending. As debt levels continue to rise, a growing share of government borrowing is being used not only to fund current spending, but also to service existing debt.
The dynamic creates a potentially reflexive cycle: larger deficits require more borrowing, increased borrowing expands the debt stock, and higher debt levels generate higher interest costs. Unless interest rates fall materially or deficits narrow, interest expense is likely to consume an increasingly large portion of federal outlays, further constraining fiscal flexibility in the years ahead.
