Persistent budget deficits continue to drive US national debt higher, with gross debt surpassing $40 trillion in August 2026 and debt held by the public near $32 trillion. Structural factors include rising mandatory outlays for Social Security and Medicare, net interest costs exceeding defense spending, and revenues lagging behind outlays amid tax policies and economic conditions. Congressional Budget Office projections show FY2026 deficits around $1.9–2.1 trillion, with debt held by the public at 101% of GDP and climbing toward 120% by 2036 under current policies. Recent developments feature elevated Treasury yields above 5% on longer bonds, influenced by inflation and geopolitical tensions, plus the debt limit set at $41.1 trillion after 2025 legislation, with potential breach risks emerging in late 2026 or 2027 absent new appropriations or reconciliation measures. FY2027 budget resolutions and any associated spending adjustments remain key variables within the resolution window.