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48 CFR · Federal Acquisition Regulation and Defense supplement

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The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.

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64 sections with “written certification”: the first 40

  • FAR 2.101 Definitions.
    …ing the original contractual rights and obligations of the parties. Change order means a written order, signed by the contracting officer, directing the contractor to make a change that the Changes clause authorizes the contracting officer…
  • FAR 19.306 Protesting a firm's status as a HUBZone small business concern.
    …the fifth business day after receipt of notification using other communication means when written notification is not required. (2) Any protest received after the designated time limits is untimely, unless it is from the contracting office…
  • FAR 33.104 Protests to GAO.
    … a complete copy of the protest within 1 day. (2) Immediately after receipt of the GAO's written notice that a protest has been filed, the agency shall give notice of the protest to the contractor if the award has been made, or, if no awar…
  • FAR 52.212-4 Contract Terms and Conditions—Commercial Products and Commercial Services.
    …t. (c) Changes. Changes in the terms and conditions of this contract may be made only by written agreement of the parties. (d) Disputes. This contract is subject to 41 U.S.C. chapter 71, Contract Disputes. Failure of the parties to this c…
  • FAR 52.219-9 Small Business Subcontracting Plan.
    …he Contractor has reason to question the representations, it may accept a subcontractor's written representations of its size and socioeconomic status as a small business, small disadvantaged business, veteran-owned small business, service-…
  • FAR 52.232-12 Advance Payments.
    … require. (k) Default. (1) If any of the following events occurs, the Government may, by written notice to the Contractor, withhold further withdrawals from the special account and further payments on this contract: (i) Termination of thi…
  • FAR 52.232-27 Prompt Payment for Construction Contracts.
    …within 10 days after the date the invoice amount is paid; and (C) The Contractor makes a written demand to the designated payment office for additional penalty payment, in accordance with paragraph (a)(6)(ii) of this clause, postmarked not…
  • FAR 52.233-1 Disputes.
    …contract shall be resolved under this clause. (c) Claim, as used in this clause, means a written demand or written assertion by one of the contracting parties seeking, as a matter of right, the payment of money in a sum certain, the adjust…
  • DFARS 234.004 Acquisition strategy.
    … contract is selected, the contract file shall include the milestone decision authority's written determination that— (1) The program is so complex and technically challenging that it would not be practicable to reduce program risk to a le…
  • FAR 1.107 Certifications.
    …er unless— (a) The certification requirement is specifically imposed by statute; or (b) Written justification for such certification is provided to the Administrator for Federal Procurement Policy by the Federal Acquisition Regulatory Cou…
  • FAR 15.102 Oral presentations.
    … presentations by offerors as requested by the Government may substitute for, or augment, written information. Use of oral presentations as a substitute for portions of a proposal can be effective in streamlining the source selection proces…
  • FAR 19.302 Protesting a small business representation or rerepresentation.
    …ontain specific grounds for the protest. (3) The protest shall include a referral letter written by the contracting officer with information pertaining to the solicitation. The referral letter must include the following information to allo…
  • FAR 19.307 Protesting a firm's status as a service-disabled veteran-owned small business concern.
    …the fifth business day after receipt of notification using other communication means when written notification is not required. (2) Any protest received after the designated time limits is untimely, except— (i) The VA or SBA may file an S…
  • FAR 19.703 Eligibility requirements for participating in the program.
    …ime contractor has reason to question the representation, it may accept a subcontractor's written representations of its size and socioeconomic status as a small business, small disadvantaged business, veteran-owned small business, service-…
  • FAR 52.209-5 Certification Regarding Responsibility Matters.
    …ion or business segment; and similar positions). (b) The Offeror shall provide immediate written notice to the Contracting Officer if, at any time prior to contract award, the Offeror learns that its certification was erroneous when submit…
  • FAR 52.212-3 Offeror Representations and Certifications—Commercial Products and Commercial Services.
    …1 CFR parts 60-1 and 60-2), or (ii) It □ has not previously had contracts subject to the written affirmative action programs requirement of the rules and regulations of the Secretary of Labor. (e) Certification Regarding Payments to Influ…
  • DFARS 201.107 Certifications.
    …RS unless— (1) The certification requirement is specifically imposed by statute; or (2) Written justification for such certification is provided to the Secretary of Defense by the Under Secretary of Defense (Acquisition and Sustainment), …
  • DFARS 252.209-7012 Prohibition Relating to Conflicts of Interest in Consulting Services—Certification.
    …bligations, the Offeror shall identify such entities as a covered foreign entity; (ii) A written analysis, including a course of action for avoiding, neutralizing, or mitigating the actual or potential conflict of interest of such a covere…
  • FAR 8.1102 Presolicitation requirements.
    …easing of motor vehicles, contracting officers shall obtain from the requiring activity a written certification that— (1) The vehicles requested are of maximum fuel efficiency and minimum body size, engine size, and equipment (if any) nece…
  • FAR 16.505 Ordering.
    … basis in accordance with paragraph (b)(1)(iii)(B) of this section, unless supported by a written determination that one of the circumstances described at 16.505(b)(2)(i) applies to the order and the requirement is waived on the basis of a …
  • FAR 33.211 Contracting officer's decision.
    …contract administration officer or contracting office, as appropriate; and (4) Prepare a written decision that shall include— (i) A description of the claim or dispute; (ii) A reference to the pertinent contract terms; (iii) A statement…
  • FAR 52.222-62 Paid Sick Leave Under Executive Order 13706.
    …13.8). (e) Withholding. The Contracting Officer will, upon his or her own action or upon written request of an authorized representative of the Department of Labor, withhold or cause to be withheld from the Contractor under this or any oth…
  • DFARS 225.7002-2 Exceptions.
    …cy. (2) The supporting documentation for the determination shall include an analysis and written certification by the requiring activity, with specificity, why alternatives that would not require a domestic nonavailability determination ar…
  • DFARS 225.7018-4 Nonavailability determination.
    …t). (2) The supporting documentation for the determination shall include an analysis and written certification by the requiring activity that describes, with specificity, why alternatives that would not require a nonavailability determinat…
  • FAR 4.604 Responsibilities.
    …d in FPDS within 30 days after contract award. (4) When the contracting officer receives written notification that a contractor has changed its size status in accordance with the clause at 52.219-28, Postaward Small Business Program Rerepr…
  • FAR 8.405-6 Limiting sources.
    …to provide access through eBuy; or (C) The agency's senior procurement executive makes a written determination that access through e-Buy is not in the Government's interest. (4) When applicable, the documentation and posting requirements …
  • FAR 9.403 Definitions.
    … part 180 and agency enacting regulations in 2 CFR subtitle B. Pre-notice letter means a written correspondence issued to a contractor in a suspension or debarment matter, which does not immediately result in an exclusion or ineligibility.…
  • FAR 12.603 Streamlined solicitation for commercial products or commercial services.
    (a) When a written solicitation will be issued, the contracting officer may use the following procedure to reduce the time required to solicit and award contracts for the acquisition of commercial products or commercial services. This proce…
  • FAR 19.1505 Set-aside procedures.
    …ll suspend further action regarding the procurement until the head of the agency issues a written decision on the appeal, unless the head of the agency makes a written determination that urgent and compelling circumstances which significant…
  • FAR 22.1703 Policy.
    …yment of such costs is required under existing temporary worker programs or pursuant to a written agreement with the employee for portions of contracts and subcontracts performed inside the United States; except that— (ii) The requirements…
  • FAR 23.109 Solicitation provisions and contract clauses.
    …, in solicitations and contracts— (1) Unless— (i) The requiring activity has provided a written justification that it is not practicable to procure sustainable products and services (see 23.104(a)); (ii) An exception under 23.105 applies…
  • FAR 52.222-8 Payrolls and Basic Records.
    …its. Contractors employing apprentices or trainees under approved programs shall maintain written evidence of the registration of apprenticeship programs and certification of trainee programs, the registration of the apprentices and trainee…
  • FAR 52.222-41 Service Contract Labor Standards.
    …r of the action taken. Each affected employee shall be furnished by the Contractor with a written copy of such determination or it shall be posted as a part of the wage determination. (iv)(A) The process of establishing wage and fringe ben…
  • FAR 52.222-50 Combating Trafficking in Persons.
    …yment of such costs is required under existing temporary worker programs or pursuant to a written agreement with the employee (for portions of contracts performed inside the United States); except that— (ii) The requirements of paragraphs …
  • FAR 52.249-2 Termination for Convenience of the Government (Fixed-Price).
    …effective date of termination, unless extended in writing by the Contracting Officer upon written request of the Contractor within this 120-day period. (d) After expiration of the plant clearance period as defined in subpart 49.001 of the …
  • FAR 52.249-3 Termination for Convenience of the Government (Dismantling, Demolition, or Removal of Improvements).
    …effective date of termination, unless extended in writing by the Contracting Officer upon written request of the Contractor within this 120-day period. (d) After expiration of the plant clearance period as defined in subpart 49.001 of the …
  • FAR 52.249-5 Termination for Convenience of the Government (Educational and Other Nonprofit Institutions).
    …effective date of termination, unless extended in writing by the Contracting Officer upon written request of the Contractor within this 120-day period. (d) After termination, the Contractor shall submit a final termination settlement propo…
  • FAR 52.249-6 Termination (Cost-Reimbursement).
    …effective date of termination, unless extended in writing by the Contracting Officer upon written request of the Contractor within this 120-day period. (e) After expiration of the plant clearance period as defined in subpart 49.001 of the …
  • DFARS 225.7003-3 Exceptions.
    …ontract. The supporting documentation for the determination shall include an analysis and written documentation by the requiring activity, with specificity, why alternatives that would not require a domestic nonavailability determination ar…
  • FAR 1.301 Policy.
    …f a proposed regulation, the Regulatory Flexibility Act applies and agencies must prepare written analyses or certifications as provided in the law. (d) Agency acquisition regulations implementing or supplementing the FAR are, for— (1) Th…

FAR (chapter 1)

DFARS (chapter 2, Defense)

Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Rule changes in progress: FAR, DFARS. Terms: glossary.