The Federal Acquisition Regulation is built from 53 numbered parts, grouped into eight subchapters labeled A through H, and codified under Title 48 of the Code of Federal Regulations.1eCFR. Title 48 of the CFR The FAR parts move roughly in the order a contract does: planning, competition, method of contracting, socioeconomic requirements, cross-cutting legal rules, specialty categories, post-award administration, and finally the clause language itself. Once you see that flow, the numbering stops feeling arbitrary.
The core FAR text sits in Chapter 1 of Title 48 and applies across every executive branch agency. Later chapters within Title 48 hold agency-specific supplements, but Chapter 1 is the foundation every contracting officer works from.
How FAR Part Numbers Work
Every FAR citation follows the same pattern, and once you can decode it, you can locate any provision in under a minute. The digits before the decimal point identify the Part. In a citation like FAR 15.203, the “15” points to Part 15, which covers contracting by negotiation.2Acquisition.GOV. Part 15 – Contracting by Negotiation
After the decimal, the numbers narrow the location. The first digit right of the decimal is the subpart; the next digits are the section within that subpart.3Acquisition.GOV. 48 CFR 1.105-2 – Arrangement of Regulations So FAR 15.203 means Part 15, Subpart 2, Section 3. A dash after the section number signals still finer subdivisions at the paragraph level. Think of the numbering as coordinates that point to an exact sentence in a very long book.
The Eight Subchapters
The 53 Parts cluster into eight subchapters, and the clustering itself tells you what kind of rule you’re looking at.4Acquisition.GOV. Federal Acquisition Regulation
Subchapter A — General (Parts 1–4)
Foundational material: the FAR’s own operating rules, definitions of key terms, ethics and conflicts-of-interest requirements, and administrative procedures.5Acquisition.GOV. Federal Acquisition Regulation If you need to know what a word means across the whole regulation, Part 2 is where it’s defined.
Subchapter B — Acquisition Planning (Parts 5–12)
Rules on competition, market research, required sources of supply, and how agencies define what they need before releasing a solicitation.6Acquisition.GOV. Subchapter B – Competition and Acquisition Planning Part 12, on commercial products and services, also lives here.
Subchapter C — Contracting Methods and Contract Types (Parts 13–18)
How agencies actually solicit offers (simplified acquisitions, sealed bidding, negotiated procurements) and the different contract structures available, from fixed-price to cost-reimbursement to time-and-materials.7Acquisition.GOV. Subchapter C – Contracting Methods and Contract Types
Subchapter D — Socioeconomic Programs (Parts 19–26)
Small business set-asides, labor law compliance, environmental requirements, foreign acquisition restrictions, and other programs where Congress has directed that procurement spending serve broader policy goals.8eCFR. 48 CFR Chapter 1 Subchapter D – Socioeconomic Programs Parts 20 and 21 within this subchapter are reserved and contain no regulatory text, which is why the count of active parts is smaller than the highest part number suggests.4Acquisition.GOV. Federal Acquisition Regulation
Subchapter E — General Contracting Requirements (Parts 27–33)
Topics that cut across contract types: patents, bonds and insurance, cost accounting standards, contract financing, and protest procedures.9eCFR. 48 CFR Chapter 1 Subchapter E – General Contracting Requirements
Subchapter F — Special Categories of Contracting (Parts 34–41)
Specialized rules for major system acquisitions, research and development, construction, IT procurement, and utility services, where standard commercial purchasing procedures don’t fit.10eCFR. 48 CFR Chapter 1 Subchapter F – Special Categories of Contracting
Subchapter G — Contract Management (Parts 42–51)
What happens after award: contract administration, audits, modifications, quality assurance, property management, and termination.11eCFR. 48 CFR Chapter 1 Subchapter G – Contract Management
Subchapter H — Clauses and Forms (Parts 52–53)
The actual contract clause language and the standard government forms referenced throughout the other subchapters.12eCFR. 48 CFR Chapter 1 Subchapter H – Clauses and Forms
Why Clauses Live in Two Different Parts
Part 52 contains the actual text of every standard clause and solicitation provision used in federal contracts.13Acquisition.GOV. Part 52 – Solicitation Provisions and Contract Clauses What Part 52 does not tell you is when a particular clause applies. That instruction, called a prescription, lives in the substantive Part where the topic is discussed. Each clause in Subpart 52.2 cross-references the FAR section that prescribes its use.14Acquisition.GOV. Using Part 52
A labor-related clause in Part 52, for example, points back to the prescription in Part 22 that tells the contracting officer under what circumstances to include it. New contractors trip on this constantly: they find a clause in Part 52 but miss the conditions governing its use because those conditions live in a different Part entirely.
The Parts Contractors Deal With Most
All 53 Parts have their place, but a handful come up so often that understanding them well pays back the reading time many times over.
Part 12 — Commercial Products and Services
If you already sell something in the commercial market and want to sell it to the government, Part 12 is the starting point. It establishes streamlined procedures for commercial acquisitions with fewer regulatory burdens than a traditional government contract, and lets contracting officers tailor standard provisions to align with customary commercial practices.15Acquisition.GOV. Part 12 – Acquisition of Commercial Products and Commercial Services Under Subpart 12.5, many laws that would apply to a traditional government contract are either waived or modified.
Part 19 — Small Business Programs
Part 19 creates the set-aside and sole-source frameworks that channel work to small businesses, including service-disabled veteran-owned, HUBZone, small disadvantaged, and women-owned small business concerns.16Acquisition.GOV. Part 19 – Small Business Programs If your company holds any of these designations, Part 19 determines when agencies must reserve opportunities for you.
Part 31 — Cost Principles
Contractors on cost-reimbursement contracts live inside Part 31. It defines what the government considers an allowable cost and what it will refuse to pay. A cost is only allowable if it meets five tests: reasonableness, allocability, compliance with cost accounting standards, consistency with contract terms, and no specific limitation elsewhere in Part 31.17Acquisition.GOV. Part 31 – Contract Cost Principles and Procedures Contractors who don’t learn these rules often discover during an audit that costs they assumed were reimbursable are not.
Part 33 — Protests, Disputes, and Appeals
Part 33 provides the formal process when a contractor believes an agency made a procurement error. Protests can go to the contracting officer, the Government Accountability Office, or the U.S. Court of Federal Claims.18Acquisition.GOV. Part 33 – Protests, Disputes, and Appeals Subpart 33.2 separately governs disputes that come up during contract performance, such as disagreements over what the contract requires or whether a change was within scope. Before filing a formal agency protest, the regulation expects the parties to try resolving the issue through direct discussions with the contracting officer.19eCFR. 48 CFR 33.103 – Protests to the Agency
Agency Supplements Sit on Top of the FAR
The base FAR is the floor, not the ceiling. FAR 1.301 gives agency heads authority to issue their own acquisition regulations that implement or supplement the FAR, and those supplements carry the same regulatory force as the base text.20Acquisition.GOV. 1.301 Policy The best-known supplement is the Defense Federal Acquisition Regulation Supplement (DFARS), which lives in Chapter 2 of Title 48 and applies to all Department of Defense contracts. NASA has the NASA FAR Supplement, GSA has the GSAM, and other agencies maintain their own.
If you bid on a DoD contract, you are bound by both the FAR and the DFARS. Missing a DFARS-unique requirement is a common stumble for contractors crossing over from civilian agency work.
Where To Read the Official Text
Two official sources publish the current FAR text for free. Acquisition.gov is the primary portal, offering the full regulation in browsable HTML and downloadable PDF, with a table of contents that lets you jump directly to any Part or subpart.4Acquisition.GOV. Federal Acquisition Regulation
The Electronic Code of Federal Regulations (eCFR) carries the same text as part of the broader CFR system.1eCFR. Title 48 of the CFR The eCFR’s advantage is historical versioning, which matters when you’re administering a contract awarded under an older Federal Acquisition Circular and need to confirm what the regulation said on the date of award. Both sites support full-text search across all 53 Parts, and either one is a faster answer than asking a colleague when you’re staring at an unfamiliar citation in a solicitation.