Appropriation

An appropriation is a law enacted by Congress that grants federal agencies the legal authority to withdraw funds from the U.S. Treasury for defined purposes, within specified limits, and during specified periods, and is the foundational requirement for all lawful federal spending.

What is an Appropriation?

The Appropriations Clause of the U.S. Constitution (Article I, Section 9, Clause 7) provides that "No Money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law." This clause makes Congressional appropriation the legal prerequisite for all federal expenditure - no agency may spend money without an appropriation from Congress.

An appropriation establishes several key parameters:

• Purpose limitation: The appropriation specifies what the money may be spent on. The Purpose Statute (31 U.S.C. § 1301) requires that appropriated funds be used only for the purposes for which they were appropriated. Using operations and maintenance funds to purchase capital equipment, for example, violates this principle.
• Amount limitation: The appropriation caps the total amount that may be obligated. Exceeding the appropriated amount violates the Anti-Deficiency Act (31 U.S.C. §§ 1341-1342).
• Time limitation: Most appropriations are available for obligation only during the period of availability specified in the appropriation act - typically one fiscal year for operations and maintenance funds, two years for research and development, and three or five years for procurement funds.

Types of appropriations:

• Annual appropriations: Available for one fiscal year (Operations and Maintenance funds).
• Multi-year appropriations: Available for a specified period beyond one year (Research, Development, Test, and Evaluation; Procurement).
• No-year appropriations: Available until expended (certain construction and emergency funds).
• Supplemental appropriations: Enacted in addition to regular annual appropriations to address urgent needs.

Why Appropriations matter for government contractors

Federal contracts must be funded by valid appropriations. A contract that exceeds available appropriations, uses the wrong type of funds, or is entered into after the appropriation's period of availability expires is potentially void or subject to Anti-Deficiency Act violations. Contractors should verify that contracts include specific line-item funding citations and that amounts have been confirmed as available before committing resources.

Example

The Army's G-4 office has $12 million in Procurement appropriation for FY2025 to buy logistics equipment. The contracting officer awards a $10 million contract in August 2025. The Procurement appropriation is a multi-year fund available for three years, so the obligation is valid. If the contracting officer had instead tried to use Operations and Maintenance (O&M) funds (single-year funds) to buy capital equipment, that would violate the purpose limitation - O&M funds are for operating expenses, not capital equipment purchases. The color of money matters as much as the amount.

Frequently Asked Questions

What is the difference between budget authority and appropriations?

Budget authority is the broader term for any authority to enter into obligations. Appropriations are the most common form of budget authority but not the only form. Contract authority (authority to enter contracts in advance of appropriations) and borrowing authority (authority to borrow from the Treasury) are other forms. Most day-to-day federal procurement is funded by appropriations.

What happens to unobligated appropriations at the end of the fiscal year?

Annual appropriations that are not obligated by the end of the fiscal year expire and become unobligated. Expired funds (in the two-year expired period) can still be used to adjust prior-year obligations but not for new obligations. After the five-year cancellation period, unobligated appropriation balances are cancelled and returned to the Treasury. Contractors sometimes see "use-it-or-lose-it" year-end spending surges driven by agencies obligating expiring funds before they expire.

Can Congress earmark appropriations for specific contractors?

Historically, Congress included earmarks directing appropriated funds to specific projects or entities. The modern earmark transparency requirements (since 2007) and periodic moratoriums have reduced but not eliminated this practice. Community Funded Requirements (CFRs) in defense appropriations reflect congressional direction to fund specific programs, though they go to programs rather than named contractors.

What is a rescission versus a sequestration?

A rescission cancels previously appropriated but unobligated budget authority - Congress decides that some earlier appropriation should not be spent. A sequestration (such as the sequestration under the Budget Control Act of 2011) applies automatic, formulaic spending cuts across accounts when Congress fails to meet deficit-reduction targets. Both reduce available funds after an initial appropriation.