How the US Defense Budget Moves From Request to Law
The NDAA authorizes the defense budget’s policy and spending levels but does not release money. Separate appropriations bills provide budget authority.
WASHINGTON, Nov. 6, 2026 — Two different bills shape the U.S. defense budget each year, and they do different jobs. The National Defense Authorization Act sets policy and authorizes appropriations. Separate appropriations bills provide the money. The Congressional Research Service’s primer on the NDAA, updated Dec. 4, 2025, is explicit: “Unlike an appropriations bill, the NDAA does not provide budget authority for government activities.”
Fiscal 2025 was the 64th consecutive fiscal year for which a defense authorization was enacted, CRS reported. The enrolled fiscal 2025 NDAA (P.L. 118-159) included 794 pages of bill text and discretionary authorizations totaling $883.7 billion. Historically, CRS writes, the authorization has been a fairly reliable indicator of congressional sentiment on later appropriations for particular programs, even though it does not itself release funds.
From the budget request to an appropriations law
The process starts with the president’s budget request, due on or about the first Monday in February, though submissions are sometimes delayed. The House and Senate Armed Services Committees hold posture hearings, draft separate bills and mark them up in subcommittee and full committee. Differences are typically resolved in a conference committee so that both chambers can approve the same text before it goes to the president. Many of the authorities in the NDAA expire at the end of the fiscal year, CRS notes, which is why committees aim to finish before Oct. 1.
Spending power sits in a different pair of committees. The CRS primer on defense appropriations, updated Feb. 11, 2026, begins with Article I, Section 9 of the Constitution: “No money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law.” The House and Senate Appropriations Committees handle discretionary spending, including most defense funding, through 12 subcommittees. Defense funding is divided mainly among the Defense; Military Construction, Veterans Affairs and Related Agencies; and Energy and Water Development subcommittees, the last of which covers defense-related work at the Department of Energy, including the National Nuclear Security Administration.
If regular appropriations are not enacted by Oct. 1, Congress may pass a continuing resolution to provide temporary funding, often at a prior year’s rate, for a period that can range from a day to a full fiscal year. Congress may also add money later through supplemental appropriations, or through direct spending in other laws. CRS cites P.L. 119-21, the 2025 reconciliation act often called the One Big Beautiful Bill Act, as an example of additional defense funding enacted outside the regular defense appropriations bill.
The practical sequence is easy to flatten in political speech. The White House asks. Authorizers set ceilings and policy. Appropriators write the checks, sometimes months later and sometimes only after a continuing resolution bridges the gap. A program can appear in the NDAA and still wait on an appropriations act before the Treasury may spend the money. Spending-process coverage continues on the defense budgets hub and Military & Defense. See also the United States page and Geopolitics.
Sources
- Congressional Research Service: Defense Primer: The NDAA Process (IF10515)
- Congressional Research Service: Defense Primer: Defense Appropriations Process (IF10514)
