How the NDAA Works: Authorize, Appropriate, and the Streak Since 1961

One bill, every year, since Kennedy

Congress fails to finish most of its work most years. The defense authorization is the exception. An annual National Defense Authorization Act has become law for 65 consecutive fiscal years, every year since 1961 (Congressional Research Service, Defense Primer: The NDAA Process). No other major piece of policy legislation has that record.

That is why the bill is called must pass. It is the vehicle members use to set military policy, and both parties have a stake in it clearing, which is how it survives even a year like fiscal 2027, when the House version passed by only 216 to 212 (Military Times, July 22, 2026).

Authorize is not appropriate

The single most useful thing to understand about the NDAA is that it does not spend money. It authorizes. An authorization sets policy and puts a ceiling on what may be spent on a program. A separate appropriations bill actually releases the cash (Congressional Research Service, Defense Primer: Navigating the NDAA).

Think of the authorization as the blueprint and the appropriation as the check. The NDAA can say the Navy is permitted to buy a certain number of ships and that troops may receive a raise. The defense appropriations bill decides how many of those dollars are handed over. Both have to happen for a program to be built or a raise to be paid, which is why a party line NDAA vote does not, by itself, stop a service member's pay increase.

What is inside the top line

The fiscal 2027 House bill authorizes roughly $1.15 trillion, a record, up from the $900.6 billion in the compromise fiscal 2026 law (The Hill, July 22, 2026; Roll Call, December 10, 2025). More than $1 trillion of that goes to the Department of Defense, about $40 billion goes to the Department of Energy to maintain the nuclear arsenal, and more than $10 billion covers other defense related activities (The Hill, July 22, 2026).

The bill also carries the annual military pay raise, set this year in a range of 5 percent to 7 percent (Military Times, July 22, 2026). Pay, weapons programs, base policy, and personnel rules all ride on the same measure, which is part of why members are reluctant to sink it even when they dislike pieces of it.

Two chambers, one compromise

The path is fixed and slow. The House passes its version. The Senate passes its own. Negotiators from the Armed Services Committees in both chambers then merge the two into a single compromise bill, which comes back for a final vote in each chamber before going to the president (Congressional Research Service, Defense Primer: The NDAA Process).

That final compromise is where the bipartisanship shows up. The House starting versions can be partisan and close, but the conference bill that becomes law has cleared with wide margins, 312 to 112 for fiscal 2026 and 281 to 140 for fiscal 2025 (Roll Call, December 10, 2025; Roll Call, December 11, 2024). The members who do the merging tend to rank among the chamber's most productive, a pattern visible in the ranking of House members by legislative effectiveness.

Why the process matters this year

In fiscal 2027 the ordinary path is under strain. The Senate blocked its version twice in July before the House passed its own, and the war in Iran has pulled defense policy into a fight it usually avoids (The Hill, July 14, 2026; Military Times, July 22, 2026). The current step by step story sits in the coverage of the record narrow House passage vote.

For a reader trying to judge whether the streak survives, the checkpoints are clear. Watch for a Senate floor vote, then a conference agreement, then two final votes. The measure has crossed all four gates for 65 straight years. Whether it does so a 66th time is a question of process, and the process is the whole point of understanding this bill.