US Fiscal Deficit Reaches $1.4 Trillion in First Nine Months of FY 2026, CBO Reports

Deficit Expansion Driven by Rising Expenditures

The United States federal budget deficit has reached $1.4 trillion during the first nine months of the 2026 fiscal year, according to the latest estimates from the Congressional Budget Office (CBO). This figure represents a substantial increase compared to the same period in the previous fiscal year, highlighting ongoing challenges in balancing federal expenditures against incoming revenues.

According to the CBO, the widening fiscal gap is primarily the result of federal spending outstripping government receipts. While federal revenues saw a moderate increase of approximately 5% during this nine-month window, overall government outlays rose by roughly 6%. This imbalance has pushed the cumulative deficit higher, raising further questions among economists regarding the long-term sustainability of the nation's fiscal trajectory.

Primary Drivers of Federal Spending

Several key sectors contributed significantly to the elevated spending levels. Chief among these is the rising cost of servicing the national debt. Due to sustained higher interest rates, the net interest outlays on public debt have escalated rapidly, becoming one of the fastest-growing components of the federal budget.

Additionally, mandatory spending programs continue to exert upward pressure on the deficit. Outlays for Social Security and Medicare both recorded notable increases, driven by an aging population and cost-of-living adjustments. Military spending and education programs also saw increased funding allocations during this period, further compounding the federal government's total expenditures.

Revenue Growth Fails to Keep Pace

On the receipt side, the federal government experienced modest growth in individual and corporate income tax collections. However, these gains were insufficient to offset the accelerated pace of spending. The CBO notes that while economic activity supported revenue collection, the rate of growth in receipts has lagged behind the compounding interest costs and mandatory entitlement obligations that dominate the current federal budget structure.