The DoD funding bill for fiscal year 2026 is the Defense Appropriations Act, which delivers $839.2 billion in discretionary spending to the Pentagon as part of a broader $925 billion national defense package that also covers nuclear weapons programs and other security activities outside the department’s direct control.1House Committee on Appropriations. Defense Appropriations Act, 20262Senate Armed Services Committee. Fiscal Year 2026 National Defense Authorization Act Executive Summary It’s one of two bills Congress passes every year to run the military. The other is the National Defense Authorization Act. Confusing the two is common, and the difference matters: policies authorized without funding are just words on paper.
Two Bills, Two Jobs
The National Defense Authorization Act (NDAA) sets what the military is allowed to do. It fixes troop levels for each service branch, greenlights or kills weapons programs, and writes the policy rules that govern everything from base closures to cybersecurity. It also sets “end strengths,” the maximum number of active-duty and reserve personnel each service can maintain, and no money can be spent on troops whose positions haven’t been authorized.3Office of the Law Revision Counsel. 10 U.S. Code 115 – Personnel Strengths: Requirement for Annual Authorization
What the NDAA does not do is spend money. That’s the job of the Defense Appropriations Act, which grants legal authority to withdraw cash from the Treasury. The Constitution requires the split: Article I, Section 9 provides that no money may be drawn from the Treasury except through appropriations made by law.4Congressional Research Service. Defense Primer: Defense Appropriations Process Authorization is the blueprint. Appropriation is the checkbook. An authorized program with no appropriation stays on the shelf, and Congress designed this two-step deliberately, forcing separate rounds of scrutiny before any tax dollars leave the building.
Where the Money Goes
The appropriations bill divides funding into a handful of major account types, each with its own rules and rhythm.
Military Personnel (MILPERS) accounts pay salaries, benefits, housing allowances, and retirement contributions for active-duty and reserve members. They also fund the Basic Allowance for Housing, which adjusts annually to local rental markets, and the TRICARE healthcare system covering service members and their families. For fiscal year 2026, all service members received a 3.8% increase in basic pay, effective January 1, 2026, because the NDAA did not set an alternate rate and the statutory formula tied to the Employment Cost Index took effect automatically.5Congressional Research Service. Defense Primer: Military Pay Raise
Operation and Maintenance (O&M) is the largest single category. It covers fuel for ships, flight hours for aircraft, training exercises, base utilities, and routine repair of ground vehicles, aircraft, and installations.6U.S. GAO. Defense Budget: DOD Needs to Improve Reporting of Operation and Maintenance Base Obligations O&M also picks up civilian employee pay and much of the contractor support on installations. When budgets tighten, this is where readiness problems appear first: training gets cut, maintenance backlogs grow.
Military Construction (MILCON) pays for new buildings, expanded facilities, roads, airfields, barracks, and piers. It’s separate from O&M, which handles upkeep and renovation of existing buildings.7Congressional Research Service. Defense Primer: Military Infrastructure Funding Congress appropriated $19.7 billion for military construction and family housing programs in fiscal year 2026.8Congressional Research Service. FY2026 Military Construction Appropriations: A Summary Projects under $9 million count as unspecified minor construction and don’t need individual approval; larger projects are named line by line in the bill, which is why base construction timelines stretch across multiple budget cycles.
Procurement funds the actual purchase of hardware: fighter jets, submarines, armored vehicles, munitions, communications gear. Many of these buys span years because defense manufacturing doesn’t fit a 12-month schedule. Federal law allows multiyear contracts when they produce real savings, the design is stable, technical risks are manageable, and realistic cost estimates exist. For contracts of $500 million or more, the Secretary of Defense must personally certify all those conditions.9Office of the Law Revision Counsel. 10 U.S. Code 3501 – Multiyear Contracts: Acquisition of Property
Research, Development, Test, and Evaluation (RDT&E) funds the pipeline of future capabilities, from basic science grants to prototype testing for hypersonic weapons, artificial intelligence platforms, and cybersecurity tools. Programs funded today may not become operational for a decade, but falling behind creates gaps procurement alone can’t close.
How the Bill Moves Through Congress
Each spring, the President submits a budget request laying out the administration’s priorities for the upcoming fiscal year. That request goes to the House and Senate Appropriations Committees, each of which has a defense subcommittee that drafts its own version of the bill. During “markups,” lawmakers work through the proposal line by line, adjusting funding levels based on testimony from military leaders, intelligence assessments, and their own priorities.4Congressional Research Service. Defense Primer: Defense Appropriations Process
Once a subcommittee approves a bill, it goes to the full chamber for a vote. The House and Senate almost never produce identical versions, so a Conference Committee reconciles them into a single bill that both chambers vote on again. The final version goes to the President for signature. The cycle is supposed to finish before October 1, when the new fiscal year begins.10USAGov. The Federal Budget Process
After the President signs, the Office of Management and Budget releases the funds through a process called apportionment, distributing spending authority to each military department on a schedule that prevents anyone from burning through a full year’s money in the first quarter.11Department of Defense. DoD Financial Management Regulation Volume 3, Chapter 2
When Congress Misses the October 1 Deadline
Congress rarely finishes the defense appropriations bill on time. When it doesn’t, one of two things happens.
A Continuing Resolution keeps the government running at roughly last year’s spending levels. Standard CR language prohibits agencies from starting any new program or activity that wasn’t funded the previous year.12Congressional Research Service. Continuing Resolutions: Overview of Components and Practices For the military, that means no new weapons programs can begin production, no new construction can break ground, and commanders execute last year’s priorities with last year’s money. A short CR is an inconvenience. A long one can genuinely degrade readiness by freezing modernization and forcing inefficient short-term contracts.
If no CR passes, the government shuts down. Military members continue reporting for duty under the emergency exception for activities involving the safety of human life or the protection of property.13Office of the Law Revision Counsel. 31 U.S. Code 1342 – Limitation on Voluntary Services They keep working, but their paychecks can be delayed until Congress restores funding. Under the Government Employee Fair Treatment Act of 2019, all military and civilian personnel are guaranteed back pay once the lapse ends. How quickly that back pay arrives depends on how quickly Congress acts.
Legal Limits on How the Money Can Be Spent
Signing the appropriations bill doesn’t give the Pentagon free rein. Two federal statutes police how every dollar is used, and violating either can end a career or trigger criminal prosecution.
The Purpose Statute requires that appropriations be spent only on the purposes Congress specified.14Office of the Law Revision Counsel. 31 U.S. Code 1301 – Application Money appropriated for aircraft maintenance cannot be redirected to build a warehouse. There’s some flexibility under the “necessary expense” doctrine, which allows purchases reasonably necessary to carry out an authorized purpose as long as the spending isn’t prohibited by law and isn’t already covered by a different appropriation. But that flexibility has real limits, and guessing wrong is dangerous.
The Anti-Deficiency Act makes it illegal for any federal employee to spend more than Congress appropriated or to commit the government to pay for something before the money exists.15Office of the Law Revision Counsel. 31 U.S. Code 1341 – Limitations on Expending and Obligating Amounts16Office of the Law Revision Counsel. 31 U.S. Code 1349 – Administrative Discipline17Office of the Law Revision Counsel. 31 U.S. Code 1350 – Criminal Penalty Every violation must be reported immediately to the President and Congress, with a copy sent to the Comptroller General.18Office of the Law Revision Counsel. 31 U.S. Code 1517 – Prohibited Obligations and Expenditures A commander who overspends by even a small amount triggers a formal investigation and reporting chain that reaches the White House. The system is designed to be uncomfortable, and it works.
Some Flexibility During the Year
The budget isn’t locked in stone once signed. The Pentagon has limited authority to shift funds between accounts when operational needs change during the year, a process called reprogramming. Below-threshold moves happen without prior congressional approval; recent thresholds have been set at $15 million for major accounts including Military Personnel, O&M, Procurement, and RDT&E, with a 20% cap on any individual Procurement or RDT&E line item, whichever limit is lower.19Congressional Research Service. Defense Primer: DOD Transfer and Reprogramming Authorities Above those thresholds, the department must formally notify the congressional defense committees and wait for their response before obligating the funds. The thresholds are deliberately low, keeping Congress close to how priorities shift once the money is in motion.