The Colors of Money: How Federal Funding Actually Works
Read the original Federalytics post on Substack.
Most companies that sell to the federal government struggle to understand the terminology and process associated with federal funding. They may be told that “FY27 funding is forecasted” or “there’s a potential for fallout funding” and make inaccurate assumptions about contract timelines.
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This can mean years of misaligned forecasting and positioning failures they never see coming.
Federal money is bounded by purpose, time, and amount — and that permission is often far narrower than the headline number.
This article breaks down the legal framework that governs how federal dollars move from Congress to business contracts, what it means for companies trying to sell to the government, and where the real timing signals are that most contractors miss entirely.
Everything here is sourced from enacted appropriations language, GAO’s Principles of Federal Appropriations Law (the “Red Book”), CRS reports, OMB guidance, DoD financial management references and my own experience as a military acquisitions officer.
Note: The Department of War will be referred to as DoD in this article as the source material has not made the agency name changes.
The Three-Part Legal Test: Purpose, Time, Amount
Purpose, Time, and Amount. These are not guidelines or best practices. They are statutory constraints rooted in Title 31 of the U.S. Code, and they apply across federal agency.
Purpose: What Can the Money Be Used For?
The “purpose statute” (31 U.S.C. §1301(a)) requires that appropriations be used only for the objects Congress intended — unless another law provides otherwise.
GAO’s Red Book summarizes and interprets how courts, statutes, and prior GAO decisions apply the necessary expense doctrine. The expenditure must:
(1) bear a logical relationship to the appropriation
(2) not be prohibited by law
(3) not be otherwise provided for (i.e., not fall under another appropriation’s purpose).
In practice, this means an agency cannot take money appropriated for construction and spend it on software development. It means O&M funds generally cannot be used for development-level work that belongs under RDT&E. The category boundaries are enforced — and when they’re challenged, it results in the kind of month-long internal fights between program offices and financial management teams that delay contracts.
To move money from one appropriation to another requires statutory transfer authority under 31 U.S.C. §1532. GAO distinguishes this from reprogramming, which is a shift within a single appropriation — often still bounded by act-specific procedures and congressional notification thresholds. Most agencies avoid cross-appropriation moves unless absolutely necessary.
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Time: How Long Is the Money Available?
The bona fide needs rule ties the availability of funds to needs arising during the period of availability. Congress assigns one of three time categories to every appropriation:
Annual (one-year) appropriations are available for new obligations only during the fiscal year for which they are enacted. The federal fiscal year runs October 1 through September 30 — not the calendar year. FY26 one-year money must be obligated by September 30, 2026.
Multi-year appropriations extend beyond one fiscal year when Congress explicitly says so. The enacted text will include language such as “to remain available for obligation until September 30, 2028.”
In DoD, RDT&E typically gets approximately two years, Procurement approximately three years, and Military Construction (MILCON) approximately five years — aligned to the risk and complexity of what’s being acquired.
No-year appropriations are available “until expended,” but they are the exception, not the rule. GAO’s Red Book explains that no-year appropriations reduce Congress’s year-to-year oversight, which is why Congress typically defaults to annual appropriations unless there is a specific programmatic justification for longer availability.
Why does Congress bother with different time windows? These are not accounting choices. They are separate legal levers Congress uses to balance flexibility against oversight. Annual appropriations keep Congress in the loop every year. Multi-year and no-year appropriations exist only where the nature of the work demands it.
Amount: How Much Can Be Obligated?
The Anti-Deficiency Act (31 U.S.C. §§1341, 1342, 1517) prohibits obligations or expenditures that exceed available budget authority or that are made in advance of appropriations. Violations are reportable, and they are taken seriously.
A parallel enforcement mechanism is the apportionment process. OMB apportions budget authority to agencies (via the SF-132), and obligations that exceed an apportionment can independently trigger ADA reporting. Before apportionment, funds are not legally available for obligation — even if Congress has already enacted the appropriation.
From Enacted Law to Executable Money
Understanding the legal framework is one thing. Understanding how money actually moves from Congress to a contracting officer’s authority to award is another.
The flow is:
Agency strategy and requirements feed the President’s Budget request.
Authorization legislation establishes or continues programs and policies. Critically, an authorization alone does not provide funding — CRS is explicit on this distinction.
Appropriations legislation provides the actual budget authority to incur obligations and make payments.
Upon enactment, a Treasury appropriation warrant establishes the amount and period of availability in the account.
OMB apportionment (the SF-132) controls the rate and categories of obligation. This is legally binding.
Agency allotments and sub-allotments further subdivide budget authority internally.
Program offices obligate — awarding contracts, issuing orders, hiring personnel.
Treasury disburses outlays to liquidate those obligations.
The critical takeaway: a validated requirement is not the same as funded, executable authority. Requirements processes can validate a need, but only enacted budget authority — plus apportionment and allotment — makes it executable.
The “Colors” Are Real, But the Names Change by Agency
“Colors of money” is DoD-heavy shorthand, but the underlying mechanism is universal. Congress creates separate appropriation accounts with legally distinct purpose, time, and amount limits for every agency. The names are different. The control mechanism is identical: the appropriations act text defines what you can do and how long you can obligate.
In the DoD, the standardized labels are familiar: O&M, RDT&E, Procurement, MILCON, MILPERS — each with typical time-availability patterns (1/2/3/5-year respectively).
Outside DoD, the same controls exist under different account names:
Department of Homeland Security uses “Operations and Support” (O&S), “Research and Development,” and “Procurement, Construction, and Improvements” (PC&I) — with explicit multi-year windows in enacted text (e.g., PC&I “until September 30, 2028”).
NASA mission accounts like “Science,” “Aeronautics,” and “Space Technology” function as R&D-like accounts with multi-year availability (e.g., “until September 30, 2025”).
Department of Energy blends R&D and capital in accounts like “Science,” which is often “until expended” — but with time-limited carve-outs for program direction.
Department of Veterans Affairs splits construction accounts so that some portions remain available until a future date and some remain available until expended — tailoring time to project realities within a single account.
Department of Health and Human Services uses annual accounts for many operating programs, “until expended” for facilities (e.g., NIH Buildings & Facilities), and mixed time windows for public health investments.
The pattern is universal: Congress uses account structure plus explicit time phrases to manage flexibility, regardless of what the agency calls its accounts.
What Happens When Money Expires
Appropriations move through three lifecycle phases:
Current (unexpired): During the period of availability, new obligations may be incurred, subject to purpose and amount constraints.
Expired: After the period of availability ends, fixed-year accounts retain their fiscal-year identity. They remain available for recording, adjusting, and liquidating obligations that were properly incurred during the current phase — but no new obligations can be made. This phase lasts five fiscal years after expiration.
Canceled (closed): On September 30 of the fifth fiscal year after the period of availability ends, the account closes. Remaining balances are canceled and unavailable for any purpose. Paying an old bill after cancellation generally requires new budget authority through a current appropriation.
For no-year accounts, there is no automatic expiration on a fiscal-year schedule — but Congress can still impose limitations, rescissions, or conditions. By statute, no-year unobligated balances may be withdrawn when the purpose is complete or when no disbursement occurs for two consecutive fiscal years.
“Fall Out Funds”
The term “fall out funds” is slang for government money expiring in the current fiscal year.
Those involved with public sector contracts, both the government side and business side, are very familiar with this terminology.
Most federal agencies, sub-agencies, and offices will go to great lengths to spend all of the money allocated to them before it expires. Some think if they give money back at the end of the fiscal year that they will get less money in their budget following year.
Whether or not that’s true, starting in the March/April time frame, offices with extra funding will start making their own lists of requirements to fund. Savvy businesses will make sure that they are working with the offices that buy what they sell to see if they can align their products or services with fallout funds.
Fall out funds can be used for a variety of things that have legal requirements and are aligned with the program office’s mission set.
Continuing Resolutions: Not Just a Delay
Continuing resolutions commonly continue funding at a “rate for operations” and typically restrict new starts — new programs or activities — unless the CR includes specific exceptions.
This is frequently misunderstood as simply a delay. It is more than that. CR terms can legally block what can be awarded, not just when. GAO reports have documented that CR-driven deferrals of new starts and quantity increases create inefficiencies and higher unit costs — lost buying power from constrained or deferred procurement.
For companies tracking contract timing, a CR is not just “the government is slow.” It is a legal constraint that reshapes what agencies can do until a full-year appropriation is enacted.
Where Most Contractors Get It Wrong
Treating funding like a bank balance. Federal money is permission bounded by purpose, time, and amount. The permission is often narrower than the number on a briefing slide.
Assuming agency budget documents equal legal authority. The controlling text is enacted law plus apportionment — not budget briefings, not POM submissions, not program office estimates. Until it’s enacted and apportioned, it is not executable.
Treating CRs as only a timing issue. CR terms can block new starts and shape what can be awarded at all — not just when awards happen.
Not understanding what they’re being told in meetings. When a government office says “we have O&M funding for this” or “this is in the FY27 budget,” those statements carry specific legal implications about what kind of money is available, when it expires, and what the office can and cannot do with it. Companies that don’t understand the implications of those statements will misread the timeline — sometimes by a year or more.
Active Reforms Worth Tracking
PPBE Reform: The Commission on Planning, Programming, Budgeting, and Execution (PPBE) Reform issued a final report with recommendations to modernize DoD’s resourcing process. DoD has issued an implementation plan. These reforms target process cadence, transparency, and execution agility — not a wholesale elimination of appropriations categories.
Software and Digital Technology Pilots: DoD has experimented with a BA-8 “Software and Digital Technology Pilot” concept — a single-appropriation approach within the RDT&E structure. This is a bounded pilot inside DoD budgeting and should not be generalized across the federal government.
Likely trajectory over the next 5–10 years:
Continued PPBE process modernization is highly likely — it is already underway. Targeted flexibilities for software and rapid capability areas have medium likelihood, given that pilots exist and are being budgeted. A government-wide collapse of appropriations categories (”colorless money”) has low likelihood, because Congress’s primary control mechanism is the account structure plus time and purpose limits — and GAO has noted that reducing those controls reduces Congress’s oversight.
Summary
The three-part framework — Purpose, Time, Amount — is the legal architecture that controls every dollar the federal government spends. It is rooted in statute, enforced through apportionment and the Anti-Deficiency Act, and applies to every agency regardless of what they call their accounts.
Understanding it is not optional for companies, consultants, or business developers working in the federal market. It determines what an office can buy, when they can buy it, and how long they have before the money disappears.
Sources: GAO Principles of Federal Appropriations Law (Red Book); Congressional Research Service reports on appropriations and budget authority; enacted FY2024 appropriations language (DoD, DHS, NASA, DOE, VA, HHS, USDA); OMB Circular A-11; 31 U.S.C. §§1301, 1341, 1342, 1517, 1532, 1552, 1555; Commission on PPBE Reform final report and DoD implementation plan.
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