The National Defense Authorization Act, or NDAA, is the annual federal law that sets policy and authorizes funding levels for the U.S. military and related national security programs. Congress has passed a version every year since 1961, and the FY2026 edition, signed into law as P.L. 119-60 on December 18, 2025, was the 65th in an unbroken streak.1U.S. Senate Committee on Armed Services. FY 2026 National Defense Authorization Act Executive Summary That most recent version supports $925 billion in total national defense funding and touches everything from troop pay raises to artificial intelligence policy to nuclear weapons oversight.
The NDAA Authorizes. It Does Not Spend.
The single most important thing to understand about the NDAA is what it does not do: it does not appropriate money. The NDAA authorizes programs, sets policy, and recommends funding levels. Actual cash comes from a separate defense appropriations bill. One bill writes the permission slip; a different bill writes the check.
This split exists because federal law requires it. Under 10 U.S.C. § 114, no funds can be appropriated for procurement of aircraft, missiles, naval vessels, military construction, or research and development unless Congress has first specifically authorized those expenditures by law.2Office of the Law Revision Counsel. 10 USC 114 – Annual Authorization of Appropriations Without an authorization act on the books, appropriators face legal barriers to funding major defense programs. The arrangement forces Congress to debate defense policy on its own terms before the money discussion begins.
What the NDAA Actually Covers
The scope is broader than the name suggests. A single NDAA can shape a service member’s paycheck, dictate which fighter jets get built, ban the Pentagon from buying certain foreign software, and fund nuclear warhead maintenance managed by a different cabinet department entirely.
Pay and Benefits
For service members and their families, the NDAA’s most immediate effect is on take-home pay. A permanent provision enacted in the FY2004 NDAA ties the annual military pay raise to the Employment Cost Index, a Bureau of Labor Statistics measure that tracks wage growth in the private sector.3U.S. Bureau of Labor Statistics. How the Employment Cost Index Is Used to Adjust Active Duty Military Pay Congress can override that formula and authorize a larger raise, which it did for FY2025 by approving a 4.5% increase plus an additional 10% bump for junior enlisted members. The FY2026 NDAA authorizes a 3.8% raise across the board.
The law also drives housing benefits. Basic Allowance for Housing rates rose an average of 4.2% for 2026, with a built-in cost-sharing element requiring service members to cover between $93 and $212 per month depending on rank and dependency status.4U.S. Department of Defense. Department of Defense Releases 2026 Basic Allowance for Housing Rates TRICARE health coverage adjustments and recruitment and retention bonuses for high-demand fields like cybersecurity and special operations also flow through the NDAA.
How Many People Wear the Uniform
Under 10 U.S.C. § 115, Congress sets the maximum number of personnel each military branch can have in uniform. The FY2026 NDAA authorizes a total active-duty end-strength of 1,302,800:5EveryCRSReport.com. FY2026 NDAA – Active Component End-Strength
- Army: 454,000
- Navy: 344,600
- Air Force: 321,500
- Marine Corps: 172,300
- Space Force: 10,400
These are legal ceilings, not staffing goals. Exceeding them requires congressional approval.
What the Military Buys
The NDAA specifies which weapons systems the military can procure and in what quantities, down to the airframe. The FY2026 law authorizes procurement of 34 F-35A aircraft, and separate legislation provided $4.6 billion for a second Virginia-class submarine in the same year. Congress does not hand the Pentagon a lump sum. Every major platform goes through a line-item review where the Armed Services Committees weigh military need against cost, industrial base capacity, and competing priorities.
Cyber and Artificial Intelligence
The NDAA has become the main vehicle for congressional oversight of emerging technology at the Pentagon. The FY2026 edition requires the Department of Defense to establish a cybersecurity and governance policy covering all AI and machine-learning systems the military uses, addressing risks like data poisoning, unauthorized access, and counterfeit components.6Congress.gov. Cyber and Artificial Intelligence Provisions in the FY2026 National Defense Authorization Act It also bans the Pentagon from acquiring AI systems from certain foreign adversaries, specifically naming Chinese-developed platforms like DeepSeek, with a limited waiver process for counterintelligence research. Other provisions direct the creation of isolated “AI sandboxes” for military model training and mandate encryption and continuous monitoring for secure mobile phones used by senior officials.
Programs Outside the Pentagon
Despite its name, the NDAA reaches beyond the Department of Defense. It authorizes nuclear weapons programs managed by the National Nuclear Security Administration within the Department of Energy, including warhead maintenance, nuclear nonproliferation work, and the naval nuclear propulsion that powers aircraft carriers and submarines.7House Armed Services Committee. History of the NDAA The Energy and Water Development Appropriations Act provides the actual dollars, but the NDAA sets the policy boundaries.
Congress also routinely uses the NDAA as a vehicle for provisions that would struggle to pass as standalone bills. Recent editions have carried sexual assault prevention training reforms, sex offender notification policies on military installations, and assessments of critical infrastructure dependent on foreign-sourced components. Because the NDAA reliably becomes law every year, it attracts legislative priorities from across Capitol Hill.
Why the NDAA Passes Every Year
The NDAA’s “must-pass” reputation is not a matter of tradition. Dozens of military pay authorities, bonus programs, and special incentive pays expire at the end of each fiscal year unless the new NDAA renews them. If the bill stalls, the Pentagon loses the ability to offer reenlistment bonuses for high-demand specialties, nurse accession bonuses, education loan repayments for military health professionals, and incentive pay for nuclear-qualified officers. Income replacement payments for frequently mobilized reservists also lapse.
The stakes go beyond bonuses. New construction projects cannot break ground, acquisition timelines for major weapons programs slip, and policy reforms stall out. That pressure explains why the streak has held across 65 fiscal years, even when the final bill required painful compromise.
How the Bill Gets Made
The cycle starts on the first Monday in February, when the President submits a budget request to Congress.8U.S. House Committee on the Budget. Time Table of the Budget Process That document opens the negotiation. The House and Senate Armed Services Committees then hold hearings, call witnesses from the Pentagon and military branches, and draft their own competing versions of the bill.
Each chamber passes its version on the floor, and a conference committee reconciles the differences. The final conference report returns to both chambers for an up-or-down vote and then heads to the President’s desk. The process routinely stretches past the start of the fiscal year on October 1, but Congress has always managed to get a final version signed.9Congress.gov. Defense Primer – The NDAA Process