The National Defense Authorization Act (NDAA) Process
The NDAA Process
Article Summary
The National Defense Authorization Act (NDAA) is Congress’s primary annual legislation for authorizing defense programs and establishing policies governing the Department of Defense (DOD), nuclear weapons programs within the Department of Energy, and other national security activities. Although the NDAA authorizes appropriations, it does not itself provide budget authority. Instead, it serves as a key policy and funding framework that guides later appropriations decisions. The Congressional Research Service (CRS) notes that fiscal year 2025 marked the 64th consecutive year in which a defense authorization act was enacted. [congress.gov]
After committee approval, the House and Senate each consider their versions of the bill on the floor, where further debate and amendments may occur. Because the two chambers often pass different versions, a conference committee is usually formed to reconcile differences. Conferees negotiate a compromise measure and produce a conference report. Both chambers must approve the same text before it can be sent to the President. The President may then sign the bill into law or veto it. [congress.gov]
The NDAA process demonstrates how Congress, committees, and the executive branch collaborate to shape U.S. defense policy, organizational priorities, and military programs each fiscal year. [congress.gov]
Key Points Chart
| Stage | Purpose | Key Activities |
|---|---|---|
| Presidential Budget Request | Initiates process | President submits defense budget proposal |
| Hearings | Review proposals | Defense leaders testify before Congress |
| Subcommittee Markup | Detailed review | Funding and policy provisions evaluated |
| Full Committee Markup | Committee approval | Amendments debated and voted upon |
| House & Senate Floor Action | Chamber consideration | Debate, amendments, and passage |
| Conference Committee | Resolve differences | House and Senate reconcile versions |
| Final Passage | Approve common text | Both chambers vote on conference report |
| Presidential Action | Enactment | President signs or vetoes bill |
Source: Congressional Research Service. [congress.gov]
Chicago-Style Citation
Duffield, Mark F., Valerie Heitshusen, and Daniel M. Gettinger. The National Defense Authorization Act (NDAA): A Primer. Congressional Research Service, December 4, 2025. Congress.gov. https://www.congress.gov/crs_external_products/IF/PDF/IF10515/IF10515.24.pdf.
Source Credibility Rating
| Source | Credibility Rating | Rationale |
|---|---|---|
| Congressional Research Service (CRS) In Focus IF10515 | ★★★★★ (5/5) | CRS is a nonpartisan legislative research agency that provides analysis directly to Congress. Its publications are widely regarded as authoritative, evidence-based, and subject-matter expert reviewed. |
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