FAR — The Story

The Federal Acquisition Regulation is the U.S. government’s manual for buying things. Every dollar the federal government spends on goods or services — roughly $700 billion a year — moves through a contract that cites this book.

Why it exists

Before 1984, every major federal agency had its own procurement regulation: the Defense Acquisition Regulation (DAR), the Federal Procurement Regulation (FPR) for civilian agencies, and a patchwork of agency-specific supplements on top. Contractors who sold to multiple agencies had to learn a dozen variations of the same rules. Congress got tired of it and, through the Office of Federal Procurement Policy Act (1974, amended 1979), ordered a uniform system.

FAR landed in April 1984. It’s jointly maintained by the DoD (representing defense), GSA (representing civilian agencies), and NASA, through a body called the FAR Council. Amendments are published as Federal Acquisition Circulars (FACs) — usually 5-10 per year. When a FAC changes a clause, the new effective date shows up in the HD1 header of that clause; you’ll see it in this vault as the effective_date frontmatter field.

The 8 subchapters — trace of a contract

FAR is 53 Parts, organized into 8 subchapters. The subchapters aren’t random; they follow the life of a procurement:

Subchapter A — General (Parts 1-4)

“The rules for the rules.”

How FAR itself works. Who publishes what. What the words mean. Who’s allowed to improperly influence an acquisition (and how to report them).

• FAR Part 1 — How FAR is organized, how agencies supplement it, and deviation authority.
• FAR Part 2 — Definitions. Every defined term in every clause lives here. When a clause says “commercial product” or “responsible contractor,” Part 2 is where those terms get their legal meaning. Worth bookmarking.
• FAR Part 3 — Improper business practices: gratuities, kickbacks, contingent fees, whistleblower protections, anti-trust referrals. This is where the ethics clauses live.
• FAR Part 4 — Administrative matters: CAGE codes, unique entity IDs, records, paper stock. Subpart 4.19 is where the FAR 52.204-21 basic cybersafeguarding rule is prescribed.

Subchapter B — Acquisition Planning (Parts 5-12)

“Before you buy.”

Everything that has to happen before a solicitation hits the street.

• FAR Part 5 — Publicizing. When agencies have to post at SAM.gov, how long they have to wait, when publication is waived.
• FAR Part 6 — Competition requirements. The statutory default is full and open competition; Part 6 is the list of the seven authorized exceptions (sole source, unusual urgency, industrial mobilization, international agreements, etc.).
• FAR Part 7 — Acquisition planning. Who has to write an acquisition plan, what it must cover, how it drives bundling and consolidation reviews.
• FAR Part 8 — Required sources. Prison industries (UNICOR), AbilityOne, GSA Schedules — the order in which agencies must check before buying from the open market.
• FAR Part 9 — Contractor qualifications: responsibility determinations, debarment/suspension, organizational conflicts of interest (OCI). This is where exclusion lists come from.
• FAR Part 10 — Market research. Legal obligation to look before you leap.
• FAR Part 11 — Describing agency needs. Performance-based statements of work, commercial-practices-first policy.
• FAR Part 12 — Commercial products and services. This Part is a procurement shortcut: if an agency can buy what it needs on the commercial market, it applies a shorter, more industry- friendly clause set. 52.212-4 is the commercial-item T&Cs — the single most frequently cited clause in FAR.

Subchapter C — Contracting Methods and Contract Types (Parts 13-18)

“How you buy.”

Which procedure and which contract type are legal, given the size and nature of the buy.

• FAR Part 13 — Simplified acquisition procedures (SAP). Buys under the Simplified Acquisition Threshold ($250Ktypically)usealighterprocess.InsideSAPlivesthemicro-purchasethreshold($10K — no competition required).
• FAR Part 14 — Sealed bidding. Historically the default; now rare. Still used for construction and commodity buys with fixed specs.
• FAR Part 15 — Negotiation. This is where most significant federal buys happen: discussions, proposal revisions, competitive range determinations, best-value tradeoffs, past-performance evaluation. If you’re reading a solicitation for anything complex, this Part governs the evaluation.
• FAR Part 16 — Contract types. Firm-fixed-price vs. cost- reimbursement, T&M, IDIQ, letter contracts, options. Risk allocation between buyer and seller is encoded in contract type; this Part is where you learn which type applies to what risk profile.
• FAR Part 17 — Special contracting methods: multi-year contracts, options, BOAs, BPAs, leader-company contracting, interagency acquisitions.
• FAR Part 18 — Emergency acquisitions. What changes when there’s a declared disaster or national emergency.

Subchapter D — Socioeconomic Programs (Parts 19-26)

“Who we prefer to buy from, and under what labor rules.”

Congress uses procurement as social policy. These Parts encode set- asides, labor protections, and country-of-origin preferences.

• FAR Part 19 — Small business programs. 8(a), HUBZone, WOSB/EDWOSB, SDVOSB. Set-asides, sole-source thresholds, subcontracting plans.
• FAR Part 20 — Reserved (historically recovered materials).
• FAR Part 21 — Reserved.
• FAR Part 22 — Labor laws. Davis-Bacon (prevailing wages on construction), Service Contract Act (prevailing wages on services), E-Verify, combating trafficking in persons, equal opportunity, executive orders that apply to federal contractors.
• FAR Part 23 — Environment, energy, sustainable acquisition, hazardous materials.
• FAR Part 24 — Privacy and Freedom of Information — mostly administrative.
• FAR Part 25 — Buy American and trade agreements. The single most confusing Part in FAR. BAA (Buy American Act) has its own rules for “domestic end product.” Trade Agreements Act overrides BAA for buys over certain thresholds from designated countries. DFARS Part 225 overlays this with Berry Amendment and specialty metals.
• FAR Part 26 — Other socioeconomic programs: Indian incentive, historically Black colleges, veteran-owned small business subcontracting.

Subchapter E — General Contracting Requirements (Parts 27-33)

“The legal underpinnings.”

The hard-law topics that cut across contract type and phase.

• FAR Part 27 — Patents, data, and copyrights. FAR’s baseline treatment of intellectual property. For defense IP, the real action is in DFARS Part 227.
• FAR Part 28 — Bonds and insurance. Bid bonds, performance bonds, payment bonds, liability insurance.
• FAR Part 29 — Taxes.
• FAR Part 30 — Cost Accounting Standards (CAS). If a contract is over $2M(fullCAS)or$750K (modified CAS) and not exempt, the contractor must comply with 19 specific cost accounting standards. CAS non-compliance is a well-worn False Claims Act vector.
• FAR Part 31 — Cost principles. What costs are allowable and what are not on a cost-reimbursement contract. Entertainment? Not allowable. Lobbying? Not allowable. A disputed allowability determination can cost a contractor millions.
• FAR Part 32 — Contract financing: progress payments, performance-based payments, commercial-item financing, assignment of claims, electronic funds transfer.
• FAR Part 33 — Protests, disputes, and appeals. GAO protests, agency-level protests, Court of Federal Claims, Contract Disputes Act. Where contractors fight back when they lose.

Subchapter F — Special Categories of Contracting (Parts 34-41)

“Unusual procurement.”

The Parts that apply to specific contract types or mission areas.

• FAR Part 34 — Major system acquisition.
• FAR Part 35 — Research and development. R&D-specific clauses, different from production.
• FAR Part 36 — Construction and architect-engineer contracts.
• FAR Part 37 — Service contracting. Personal-services prohibition, inherently governmental functions, A-76 legacy.
• FAR Part 38 — Federal Supply Schedules (GSA Schedule contracting).
• FAR Part 39 — Information technology. Section 508 accessibility, OMB-mandated IT policies. Narrower than it sounds — most IT buys happen under Part 12 (commercial) and Part 15 (negotiation), not here.
• FAR Part 40 — Information security and supply chain risk management. Recently consolidated.
• FAR Part 41 — Acquisition of utility services.

Subchapter G — Contract Management (Parts 42-51)

“After you’ve awarded it.”

Everything that happens between contract award and contract closeout.

• FAR Part 42 — Contract administration and audit. Who’s the ACO? The DCMA-DCAA-DCMA split. Past performance reporting.
• FAR Part 43 — Contract modifications. Bilateral vs. unilateral mods, change orders, equitable adjustments. The “Changes” clause (52.243-x) is a contractor’s primary lever for getting paid for out-of-scope work.
• FAR Part 44 — Subcontracting policies and procedures.
• FAR Part 45 — Government property in a contractor’s possession.
• FAR Part 46 — Quality assurance. Inspection, acceptance, warranties.
• FAR Part 47 — Transportation.
• FAR Part 48 — Value engineering. Contractor proposes cost-reduction changes, shares the savings.
• FAR Part 49 — Terminations. Termination for convenience, termination for default. T4C settlement proposals, cure notices. One of the highest-stakes Parts for a contractor.
• FAR Part 50 — Extraordinary contractual actions. Public Law 85-804 indemnification, SAFETY Act anti-terrorism liability shields.
• FAR Part 51 — Use of government sources by contractors.

Subchapter H — Clauses and Forms (Parts 52-53)

“The boilerplate.”

• FAR Part 52 — The clause library. This is where 52.204-21, 52.212-4, 52.219-14, 52.227-14 — every clause that gets incorporated by reference into a solicitation or contract — actually lives. Earlier Parts prescribe clauses (“insert the clause at 52.204-21”); Part 52 is where the text of those clauses resides. In this vault, every FAR Part 52 Subpart 52.2/FAR 52.*.md note IS a contract clause, ready to be cited or transcluded.
• FAR Part 53 — Standard forms (SF-1449, SF-33, DD-250, etc.). Mostly administrative.

How to read a FAR citation

A citation like FAR 15.306(d)(3)(ii) decomposes as:

Piece	Meaning
15	Part — high-level topic (here: Negotiation)
.3	Subpart — narrower topic inside that Part
.306	Section — specific rule inside that Subpart
(d)	Top-level paragraph
(3)	Second-level sub-paragraph
(ii)	Third-level sub-sub-paragraph

Clauses have a dash form (52.204-21) where the number after the dash is a serial inside the subpart — there’s no semantic meaning, the numbers are just assigned in sequence.

See How FAR Is Organized for more on numbering conventions including the lettering cycle (alpha → digit → roman → uppercase alpha) used for sub-paragraphs.

How clauses get into a contract

Here’s the flow, which trips up most non-procurement people:

1. A prescription clause in an earlier FAR Part (say, 4.1903) says “the Contracting Officer shall insert the clause at 52.204-21 in solicitations and contracts when the contractor will have Federal Contract Information on its systems.”
2. The Contracting Officer incorporates 52.204-21 by reference in the solicitation’s clause matrix — usually a Section I (“Contract Clauses”) in a Uniform Contract Format document.
3. The clause text isn’t reprinted in the solicitation; it’s incorporated by citation alone, making contracts much shorter.
4. When the contract is awarded, the contractor is bound by the clause as if the text were typed into the contract.

This means you need the real regulatory text (this vault) to know what you actually signed up for when you see “52.204-21” listed in a contract’s clause matrix.

Related

• DFARS — The Story — the defense overlay
• Contract Lifecycle — which parts apply at each procurement phase
• How FAR Is Organized — numbering primer
• FAR — Index — Dataview table of every FAR clause

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Annual FAR volume statistics: roughly 2,000 pages of regulatory text, ~3,000 sections in the vault, ~1,500 distinct clauses in Part 52. Everything is here.