US federal spending data shows the Department of Defense budget authority reached $2.63 trillion as of September 30, 2026, up from $2.58 trillion on June 30, 2026. ^[1] That increase of $56 billion closes the fourth quarter of federal fiscal year 2026, which runs from October 2025 through September 2026. ^[1] Federal spending data shows the amount of money the Department of Defense obligated rose to $1.43 trillion by September 30, 2026, compared to $1.29 trillion on June 30, 2026. ^[2] Federal spending data shows actual outlays for the Department of Defense totaled $1.27 trillion as of September 30, 2026, an increase from $1.15 trillion recorded on June 30, 2026. ^[3]