FAR Clauses
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The Federal Acquisition Regulation contains over 1,500 clauses. These 30 are the ones that appear in nearly every Federal solicitation and trip up the most proposal teams. Each entry covers what the clause requires, when it applies, who it flows down to, common pitfalls, and the specific proposal-team checklist.

30
clauses explained
13
FAR / DFARS parts
112
common pitfalls
113
proposal-team action items

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Commercial Products & Services (Part 12)

4 clauses

FAR 52.212-1
Instructions to Offerors — Commercial
Sets the rules for how to format and submit an offer for a commercial product or service: page limits, addressing, submission deadlines, late-offer treatment, what constitutes an offer, and the period for acceptance. Replaces the more elaborate FAR 52.215-1 instructions in commercial buys under Part 12.
FAR 52.212-2
Evaluation — Commercial
Lists the non-price evaluation factors (e.g., technical capability, past performance, delivery) and states the relative importance of price versus non-price factors. The CO fills in the bracketed factors in the solicitation — offerors must respond to each factor exactly as written.
FAR 52.212-4
Contract Terms — Commercial
The 'commercial-item terms' that replace the mass of Part 49 / Part 32 clauses in non-commercial contracts. Covers inspection/acceptance, assignments, changes (bilateral only), disputes (Contract Disputes Act), excusable delays, invoices, payment, patent indemnity, taxes, termination for the Government's convenience, termination for cause, title, warranty, and limitation of liability.
FAR 52.212-5
Statutes Required — Commercial
The 'menu' clause — the CO checks the boxes for which statutory and Executive-Order clauses apply (small-business preferences, EEO, anti-trafficking, Buy American, telecom Section 889, etc.). Whatever is checked is incorporated by reference into the contract.

Competitive Acquisition (Part 15)

1 clause

FAR 52.215-1
Instructions to Offerors — Negotiated Acquisition
The instruction set that governs the full Part 15 negotiated-acquisition process: proposal submission, late proposals, clarifications and exchanges, discussions, the competitive range, final proposal revisions (FPR), and award without discussions. Far more procedurally elaborate than its commercial-item counterpart 52.212-1.

SAM Registration & Reps/Certs (Part 4)

3 clauses

FAR 52.212-3
Offeror Reps & Certs — Commercial
The single point where an offeror represents its size status, ownership, place of performance, taxpayer ID, and dozens of socioeconomic and statutory certifications (telecom Section 889, child-labor goods, prohibited persons, FCC equipment, etc.). Most representations are completed annually in SAM.gov; this clause says the SAM reps are incorporated by reference unless the offeror needs to update for the specific solicitation.
FAR 52.204-7
System for Award Management
Every offeror must have an active SAM.gov registration at the time of offer submission and must maintain it through award. SAM consolidates entity registration, reps and certs, and assignment of the Unique Entity ID (UEI) — the replacement for the old DUNS number.
FAR 52.204-13
SAM Maintenance
Companion to 52.204-7. While 52.204-7 governs the time-of-offer registration requirement, 52.204-13 requires the awardee to keep SAM registration active and accurate throughout contract performance — and to notify the CO of any material changes.

Small Business Programs (Part 19)

4 clauses

FAR 52.219-8
Utilization of Small Business
Policy clause that requires the contractor to provide maximum practicable opportunity for small, veteran-owned, service-disabled veteran-owned, HUBZone, small disadvantaged, and women-owned small business concerns to participate as subcontractors. Companion to 52.219-9 (subcontracting plan).
FAR 52.219-9
Small Business Subcontracting Plan
Requires non-small primes to submit a formal Small Business Subcontracting Plan with quantitative goals across the small-business socioeconomic categories: SB, SDB, WOSB, HUBZone, VOSB, SDVOSB. Plans are evaluated, approved, and incorporated as contract terms. Performance is reported via the Individual Subcontract Report (ISR) and Summary Subcontract Report (SSR) in eSRS.
FAR 52.219-14
Limitations on Subcontracting
Caps how much of the contract value (calculated as the amount paid to subcontractors as a percentage of the total amount the small-business concern is paid) a small-business prime can subcontract to other-than-similarly-situated entities. After the May 2016 NDAA rule changes, the limits are based on percentage of the amount paid TO the prime that is paid FURTHER to non-similar subs. Specific limits: services 50%, supplies 50%, general construction 85%, specialty trade 75%.
FAR 52.219-28
Small Business Rerepresentation
Requires the prime to re-represent its small-business size status (1) within 30 days after novation, (2) within 30 days after a merger/acquisition that does not require novation but affects size, (3) within 60 days of the end of the 5th year of contract performance for long-term contracts, and (4) within 60 days prior to each option exercise on long-term contracts. Prevents 'small business grown out of size' from continuing to receive small-business credit forever.

Labor, EEO & Service Contract Act (Part 22)

1 clause

FAR 52.222-26
Equal Opportunity
Implements Executive Order 11246 prohibiting discrimination in employment based on race, color, religion, sex, sexual orientation, gender identity, or national origin. Contractors with 50+ employees and a contract of $50K+ must have a written Affirmative Action Plan. OFCCP enforces.

Ethics & Anti-Trafficking (Parts 3 / 22)

1 clause

FAR 52.222-50
Combating Trafficking in Persons
Implements the Trafficking Victims Protection Act and EO 13627. Prohibits the contractor and its employees / subs from engaging in trafficking-in-persons activities (severe forms of trafficking, sex acts during performance, forced labor, etc.). Adds an enhanced compliance plan and certification for any contract > $500K performed outside the United States.

Cybersecurity & Supply Chain (Parts 4 / 39 / DFARS 204)

8 clauses

FAR 52.204-24
Section 889 Part B Representation
Offerors must represent whether they 'use' covered telecommunications equipment or services (Huawei, ZTE, Hikvision, Dahua, Hytera, and their subsidiaries/affiliates) as a substantial or essential component of any system or as critical technology in any system — even in non-Federal work. Counterpart to 52.204-25 (the contract clause). Together they implement Section 889(a)(1)(B) of the FY19 NDAA.
FAR 52.204-25
Section 889 Part A & B Prohibition
Contract clause that prohibits the Government from (Part A) procuring covered telecom equipment/services as a substantial or essential component of any system, and prohibits the awardee from (Part B) using such equipment/services anywhere in its enterprise. Covers Huawei, ZTE, Hikvision, Dahua, Hytera, plus subsidiaries and affiliates and any entity owned or controlled by China.
FAR 52.204-26
Covered Telecom — Annual SAM Rep
The annual SAM.gov representation about covered telecom equipment/services — completed once per year as part of SAM reps and certs. Counterpart to 52.204-24 (per-solicitation rep) and 52.204-25 (contract clause). All three clauses implement Section 889.
FAR 52.204-27
Prohibition on ByteDance Apps (TikTok)
Implements the 'No TikTok on Government Devices Act' (Public Law 117-328 Division R). Prohibits the contractor and its personnel from having or using any ByteDance-covered application (most notably TikTok) on any IT used in performance of the contract — Government-furnished or contractor-owned.
DFARS 252.204-7012
Cyber Incident Reporting (DoD)
The bedrock DoD cybersecurity clause. Requires contractors handling Covered Defense Information (CDI) to implement NIST SP 800-171 protections and to report cyber incidents to DoD within 72 hours. Paired with DFARS 252.204-7019/7020 (NIST 800-171 DoD Assessments) and 252.204-7021 (CMMC). Failure here ripples across CMMC compliance and False Claims Act risk.
DFARS 252.204-7019
NIST 800-171 Assessment Notice
Notice clause — informs offerors that they must have a current NIST SP 800-171 DoD Assessment posted in the Supplier Performance Risk System (SPRS) and that the assessment score will be considered as part of responsibility determinations.
DFARS 252.204-7020
NIST 800-171 DoD Assessment Requirement
Substantive companion to 252.204-7019. Requires contractors and subs that process, store, or transmit CDI to have a current NIST 800-171 DoD Assessment in SPRS, and to give the Government access to facilities and personnel for Medium and High Assessments. Establishes the assessment methodology (Basic = self, Medium / High = DoD-led).
DFARS 252.204-7021
CMMC Requirements
The CMMC 2.0 clause. Requires contractors to have the specified CMMC level certification (Level 1 / Level 2 / Level 3) prior to award and to maintain it through performance. Level 1 is self-assessment (Federal Contract Information); Level 2 typically requires C3PAO third-party assessment (CUI); Level 3 requires DIBCAC assessment (most sensitive CUI). Phased rollout in 2025-2028; check the specific solicitation for required level and assessment type.

Foreign Sourcing & Buy American (Part 25)

1 clause

FAR 52.225-13
Restrictions on Foreign Purchases
Prohibits acquisition of supplies or services from sources sanctioned by OFAC under the Office of Foreign Assets Control programs (Cuba, Iran, North Korea, Syria, Russia (various sectoral lists), and others), Specially Designated Nationals (SDN) list, sectoral sanctions lists, and entities under various entity lists.

Data Rights & IP (Part 27)

1 clause

FAR 52.227-14
Rights in Data — General
Establishes the baseline data-rights regime for civilian-agency contracts. By default, the Government gets unlimited rights in data first produced under the contract (Limited Rights and Restricted Rights protect contractor-funded background data). Five alternates allow tailoring. DoD uses DFARS 252.227-7013/7014 instead.

Payment & Financing (Part 32)

1 clause

FAR 52.232-33
EFT Payment via SAM
All Federal contract payments are made by EFT to the bank account on file in SAM (with rare statutory exceptions). The contractor is responsible for keeping the banking information in SAM current and complete.

Subcontracting (Part 44)

1 clause

FAR 52.244-6
Subcontracts for Commercial Items
Defines what a non-commercial prime must flow down to its commercial-item subcontractors. Limits the long FAR clause list to a specifically enumerated subset — the rest of the FAR clauses are excluded from commercial-item subs to preserve their commercial nature.

Government Property (Part 45)

1 clause

FAR 52.245-1
Government Property
Establishes the contractor's stewardship obligations for Government property: receipt, accountability records, maintenance, use, subcontractor control, reports, relief of stewardship responsibility, contract closeout. Includes 10 outcomes the contractor's property management system must achieve.

Changes & Termination (Parts 43 / 49)

3 clauses

FAR 52.243-1
Changes — Fixed-Price
The classic Government 'changes' clause — gives the Contracting Officer the unilateral right to direct changes within the general scope of the contract (drawings, design specifications, method of shipment, place of delivery, etc.). The contractor must perform; the equitable adjustment (price, schedule, or both) is settled afterward through Request for Equitable Adjustment or claim. This is distinct from the bilateral-only changes regime under 52.212-4 for commercial items.
FAR 52.249-2
Termination for Convenience (Fixed-Price)
Gives the Government the unilateral right to terminate the contract, in whole or in part, for the Government's convenience. Contractor must stop work upon notice and is entitled to a settlement covering: (1) work performed before termination, (2) work in progress, (3) settlement expenses, and (4) profit on work performed (but no anticipatory profit on the terminated portion).
FAR 52.249-8
Default (Fixed-Price Supply/Service)
Allows the Government to terminate the contract for default (T4D) if the contractor: fails to deliver, fails to make progress that endangers performance, or fails to perform any other contractual provision. Contractor is liable for excess reprocurement costs and not paid for partially completed work. Cure notice and show-cause notice procedures are required.

How proposal teams use this library

  • 1. Compliance matrix. Pull every FAR / DFARS clause referenced in your Section L/M or 52.212-5 checklist and map each one to your proposal section.
  • 2. Flow-down templates. Use the “flow-down” field on each clause to confirm your subcontract templates carry the right clauses to commercial-item subs (52.244-6) vs. non-commercial subs.
  • 3. Pre-submission pitfall scan. Each clause page lists the most common pitfalls — run them as a final check before submission.
  • 4. Train new proposal staff. Onboard new Capture / PM / contracts staff on the clauses that drive 80% of compliance risk in 30 minutes.

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Reference content based on the Federal Acquisition Regulation and DFARS as of June 2026. Always verify the current clause text at acquisition.gov before submitting any proposal. This library is educational and not legal advice.