48 CFR 2.101: Definitions, Thresholds, and Authority to Bind

48 CFR 2.101 is the master glossary of the Federal Acquisition Regulation. It defines the terms used across every FAR part, and those definitions apply to every federal contract, solicitation, and clause unless a more specific part of the FAR overrides them.¹ The definitions carry binding legal weight. Both agencies and contractors are held to them when disputes arise over performance, pricing, or eligibility, and a single misread term can disqualify a bid, trigger an audit, or expose a company to False Claims Act liability.

Why One Glossary Governs Every Federal Contract

The vocabulary in 2.101 applies across all of 48 CFR Chapter 1. When the Department of Defense uses “commercial product” in a solicitation, it means the same thing as when the General Services Administration uses the phrase on a supply schedule. Contractors working across multiple agencies don’t have to relearn the language for each customer, and contracting officials drafting solicitations, evaluating proposals, and administering awards all draw from the same terms.

Courts and boards of contract appeals treat the FAR definitions as incorporated into the contract by operation of law. Neither party can argue they meant something different when they signed. Both sides are presumed to know 2.101 the moment they enter a federal procurement, which places the burden on the contractor to verify that their internal understanding matches the regulatory text before submitting a proposal.

Who Can Actually Bind the Government

Some of the most consequential definitions in 2.101 identify who has authority to commit federal funds. This is where contractors most often run into trouble.

Contracting Officer

A contracting officer is a person with the authority to enter into, administer, or terminate contracts and make related determinations and findings.¹ The term covers authorized representatives acting within the limits of their delegated authority. The FAR further distinguishes an administrative contracting officer, who manages ongoing performance, from a termination contracting officer, who handles closeouts. One person can fill all these roles on a single contract.

The practical point: the contracting officer’s signature is what commits the government. Program managers, end users, and technical evaluators cannot modify price, scope, or delivery no matter how senior they are. If someone without contracting authority directs a contractor to perform additional work, the government is not legally bound to pay for it.

Contracting Officer’s Representative

A contracting officer’s representative (COR) monitors day-to-day performance, and the FAR draws a hard boundary around that role. A COR has no authority to make commitments or changes that affect price, quality, quantity, delivery, or any other contract term.² The designation must be in writing with explicit limitations, and the written designation includes a statement that the COR may face personal liability for unauthorized acts.

Contractors who take direction from a COR to expand scope or change deliverables, without a written modification from the contracting officer, are performing at their own risk. The government can refuse to pay.

Agency Head Versus Head of the Contracting Activity

The FAR distinguishes the “head of the agency,” meaning the Secretary, Administrator, or other chief official of the executive agency, from the “head of the contracting activity,” a lower-level official who manages the agency’s contracting functions.¹ Different FAR provisions assign approval authority to one or the other. Knowing which role a provision names tells you who actually has sign-off power for waivers, justifications, and high-value procurements.

How the Government Classifies What It Buys

Several definitions in 2.101 control how a purchase is categorized. The classification decides which clauses apply, how much cost data you must disclose, and whether streamlined procedures are available.

Commercial Products and Commercial Services

A commercial product is one of a type customarily used by the general public or by nongovernmental entities for nongovernmental purposes, provided it has been sold or offered for sale to the public.¹ The definition also reaches items evolved from commercial products through technology advances but not yet on the market, and items with minor modifications made to meet federal requirements. A parallel definition covers commercial services.

This classification matters because it drives pricing transparency. When a product qualifies as commercial, the government generally cannot demand detailed cost breakdowns. The entire streamlined framework in FAR Part 12 depends on the definition.³ Misclassifying a developmental or custom-built item as commercial to avoid cost disclosure can trigger False Claims Act liability, which carries treble damages and per-claim civil penalties adjusted for inflation each year.⁴

Best Value

Best value is defined as the expected outcome of an acquisition that, in the government’s estimation, provides the greatest overall benefit in response to the requirement.¹ In some procurements, best value means the lowest price among technically acceptable offers. In others, it lets the agency pay more for a proposal that scores higher on technical quality or past performance. The definition is deliberately flexible, giving agencies room to tailor the evaluation to the procurement’s complexity.

Personal Services Contracts

A personal services contract is one that, by its terms or by how it’s administered, makes contractor employees appear to function as government employees.⁵ These contracts are generally prohibited unless a statute authorizes them. If a federal official supervises contractor workers the same way they’d supervise federal employees, the arrangement can be reclassified as an improper personal services contract regardless of what the paperwork says.

Dollar Thresholds for 2026

Several of the most practical definitions in 2.101 are dollar thresholds. Effective October 1, 2025, the FAR adjusted many of them upward for inflation.⁶ Current values:

Micro-purchase threshold: $15,000. Purchases below this can be made without competitive bidding, typically on a government purchase card.⁷
Simplified acquisition threshold: $350,000. Procurements at or below this level qualify for streamlined procedures with reduced paperwork.⁶
Simplified procedures for commercial products and services: $9,000,000. Commercial acquisitions up to this amount can use the streamlined procedures in FAR Part 13.
Cost or pricing data threshold (contracts awarded after July 1, 2018): $2,500,000. Above this, contractors generally must submit certified cost or pricing data unless an exception applies.
Major system: $3,000,000. Research and development acquisitions above this figure trigger additional oversight.

These numbers move periodically under a statutory inflation formula. The prior simplified acquisition threshold was $250,000 and the prior micro-purchase threshold was $10,000, so anyone relying on older guidance can easily misidentify which procedures apply. Verify the current figures on acquisition.gov before preparing a bid.

Small Business Status and Affiliation

A small business concern is a company, including its affiliates, that is independently owned and operated, not dominant in the field where it competes for government contracts, and meets the size standards set by the Small Business Administration under 13 CFR Part 121.⁵ The applicable size standard depends on the NAICS code assigned to the solicitation. Some industries measure by average annual revenue over the past five fiscal years; others measure by average number of employees over the past two years.

Affiliation rules make this more complicated than it looks. If one company controls or has the power to control another, their revenues or employees are combined for size purposes. The SBA examines common ownership, shared management, and contractual relationships to decide affiliation. A company that looks small on its own can be classified as large once affiliates are added in, which disqualifies it from set-aside contracts.

When a Specialized FAR Part Overrides 2.101

The opening paragraph of 2.101 states that its definitions apply throughout the FAR unless a different part, subpart, or section provides its own definition for a particular context.¹ When that happens, the specialized version controls within its own part, and 2.101 typically includes a cross-reference.

FAR Part 31 illustrates the point. It covers contract cost principles and contains dozens of accounting-specific definitions that don’t appear in 2.101 at all, including “actual costs,” “actuarial accrued liability,” and “allocable cost.”⁸ FAR Part 15 similarly defines terms like “deficiency,” “weakness,” and “proposal revision” for competitive negotiations.⁹ If you’re responding to a cost-reimbursement solicitation, Part 31’s definitions govern how allowable costs are calculated even where Part 2 uses related terms differently.

The takeaway: when you see a defined term in a specific FAR part, check whether that part has its own definitions section before defaulting to 2.101. The general glossary is the starting point, not always the final answer.

What Happens When the Definitions Get Ignored

The role definitions become concrete when someone without authority makes a promise on the government’s behalf. The FAR defines an unauthorized commitment as an agreement that isn’t binding solely because the government representative who made it lacked the authority to do so.¹⁰ It happens more often than you’d expect: a program manager verbally directs a contractor to start work before award, or a COR approves added deliverables outside their authority.

When that occurs, the government is not obligated to pay. The contractor performed at their own risk. The only path to payment is ratification, a formal process in which an official with actual contracting authority retroactively approves the commitment, and ratification is not automatic. Legal counsel must concur, funds must have been available at the time, and the price must be fair and reasonable.¹⁰

Definitional disputes that survive the contracting officer’s decision proceed through the framework in FAR Subpart 33.2, which governs claims and appeals.¹¹ Reviewing 2.101 before responding to a solicitation takes an hour. Litigating a definitional dispute takes years.

1
Acquisition.GOV. 2.101 Definitions
2
Acquisition.GOV. 1.602-2 Responsibilities
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Acquisition.GOV. Part 12 – Acquisition of Commercial Products and Commercial Services
4
Office of the Law Revision Counsel. 31 USC 3729 – False Claims
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eCFR. 48 CFR 2.101 – Definitions
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Acquisition.GOV. Threshold Changes – October 1st, 2025
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GSA SmartPay. Micro-purchase Threshold Limit Increased to $15,000
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Acquisition.GOV. Part 31 – Contract Cost Principles and Procedures
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Acquisition.GOV. Part 15 – Contracting by Negotiation
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Acquisition.GOV. 1.602-3 Ratification of Unauthorized Commitments
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Acquisition.GOV. Subpart 33.2 – Disputes and Appeals