Authorize vs. appropriate: two steps before a dollar moves
The National Defense Authorization Act authorizes defense spending: it sets policy and caps. The appropriations bills then provide the actual budget authority, the legal permission to spend. The FY2025 defense discretionary cap under the Fiscal Responsibility Act was about $895.2 billion. This page uses the NDAA’s enacted categories because they show the clearest picture of where the money is meant to go.
Where the $883.67 billion goes
Vintage: FY2025 enacted, National Defense Authorization Act (P.L. 118-159). Figures in billions.
| Category | FY2025 | What it pays for |
|---|---|---|
| Military personnel | $182.75B | Pay, allowances, and benefits for active duty and reserve service members |
| Operation and maintenance | $294.46B | Fuel, training, maintenance, facilities, and day-to-day readiness |
| Procurement | $167.85B | Aircraft, ships, vehicles, and weapons systems bought from contractors |
| Research, development, test, and evaluation | $143.77B | New weapons and technology development |
| Military construction and family housing | $17.55B | Bases, barracks, and housing for military families |
| Atomic energy defense programs | $33.28B | Nuclear weapons programs, mostly at the Department of Energy |
| Defense-related activities | $0.51B | Other defense activities outside the main accounts |
Three things the table tells you
People cost more than weapons. Military personnel ($182.75B) plus operation and maintenance ($294.46B) is $477.21 billion, more than half of the $849.87 billion Defense-Military subtotal. Paychecks and readiness dwarf procurement.
Some “defense” money lives at Energy. The $33.28 billion in atomic energy defense programs sits mostly at the Department of Energy, which maintains the nuclear weapons stockpile. Department budgets do not always match where the work happens.
Almost all of it is discretionary. Unlike Social Security or Medicare, defense spending is re-decided every year in appropriations. That is why defense dominates the annual budget debate even though mandatory programs are larger.
Where to see the company-by-company detail
The categories above are the authorized totals. To see which companies receive the procurement and operations dollars, use USAspending.gov, the official public database of federal contracts, grants, and other awards. The Daily Treasury Statement’s “DoD – Military Active Duty Pay” line ($105.2B in FY2025) shows the paycheck side directly; see our Follow the Money page for the trail.
Sources
- FY2025 NDAA totals and category splits: CRS IN12404
- Contract and award detail: USAspending.gov
- Cash withdrawals by agency: Daily Treasury Statement