Record-High Deficit Driven by Soaring Interest Costs
The U.S. federal government’s budget deficit totaled $1.96 trillion for the first 11 months of fiscal year 2026 (October 2025 through August 2026), according to the Treasury Department's monthly statement released on September 12. While slightly below the $1.97 trillion recorded in the same period of the prior fiscal year, the deficit remains among the highest levels ever observed.
Monthly Figures and Seasonal Patterns
In August alone, the shortfall reached $166.8 billion. However, the final month of the fiscal year (September) typically shows a surplus due to corporate tax payment deadlines, which may modestly temper the full-year deficit figure.
The Interest Burden: A Growing Fiscal Challenge
A primary driver of the persistent deficit is the sharp increase in interest payments on the national debt. Treasury data indicates that the average interest rate on marketable U.S. debt had risen to 3.48% by the end of August. This represents an increase of more than 2 percentage points compared to five years ago.
As older, low-yielding bonds mature, the Treasury is forced to refinance them at significantly higher current market rates. This rollover process is directly increasing the government's borrowing costs. Most analysts expect the average interest rate on U.S. debt to continue climbing in the coming quarters, suggesting that interest expenses will exert even greater pressure on the budget deficit.
The expanding deficit and mounting debt service costs are emerging as a central challenge to the nation's long-term fiscal outlook.