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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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176 sections with “modifications”: the first 40

  • DFARS 204.1671 Order of application for modifications.
    (a) Circumstances may exist in which the numeric order of the modifications to a contract is not the order in which the changes to the contract actually take effect. (b) In order to determine the sequence of modifications to a contract or …
  • FAR 22.404-6 Modifications of wage determinations.
    …g the entire determination with changes incorporated. (2) All project wage determination modifications expire on the same day as the original determination. The need to include a modification of a project wage determination for the primary…
  • FAR 43.103 Types of contract modifications.
    Contract modifications are of the following types: (a) Bilateral. A bilateral modification (supplemental agreement) is a contract modification that is signed by the contractor and the contracting officer. Bilateral modifications are used t…
  • FAR 52.214-28 Subcontractor Certified Cost or Pricing Data—Modifications—Sealed Bidding.
    …01-7(c)(1)(i), insert the following clause: Subcontractor Certified Cost or Pricing Data—Modifications—Sealed Bidding (JUN 2020) (a) The requirements of paragraphs (b) and (c) of this clause shall (1) Become operative only for any modifi…
  • FAR 52.215-13 Subcontractor Certified Cost or Pricing Data—Modifications.
    … 15.408(e)(1), insert the following clause: Subcontractor Certified Cost or Pricing Data—Modifications (JUN 2020) (a) The requirements of paragraphs (b) and (c) of this clause shall— (1) Become operative only for any modification to this…
  • FAR 52.215-21 Requirements for Certified Cost or Pricing Data and Data Other Than Certified Cost or Pricing Data—Modifications.
    …nts for Certified Cost or Pricing Data and Data Other Than Certified Cost or Pricing Data—Modifications (NOV 2021) (a) Exceptions from certified cost or pricing data. (1) In lieu of submitting certified cost or pricing data for modificatio…
  • FAR 52.214-7 Late submissions, modifications, and withdrawals of bids.
    As prescribed in 14.201-6(c)(3), insert the following provision: Late Submissions, Modifications, and Withdrawals of Bids (NOV 1999) (a) Bidders are responsible for submitting bids, and any modifications or withdrawals, so as to reach the…
  • FAR 52.214-23 Late submissions, modifications, revisions, and withdrawals of technical proposals under two-step sealed bidding.
    As prescribed in 14.201-6(r), insert the following provision: Late Submissions, Modifications, Revisions, and Withdrawals of Technical Proposals Under Two-Step Sealed Bidding (NOV 1999) (a) Bidders are responsible for submitting technical…
  • FAR 52.214-27 Price Reduction for Defective Certified Cost or Pricing Data—Modifications—Sealed Bidding.
    …nsert the following clause: Price Reduction for Defective Certified Cost or Pricing Data—Modifications—Sealed Bidding (JUN 2020) (a) This clause shall become operative only for any modification to this contract involving aggregate increas…
  • FAR 52.215-11 Price Reduction for Defective Certified Cost or Pricing Data—Modifications.
    …nsert the following clause: Price Reduction for Defective Certified Cost or Pricing Data—Modifications (JUN 2020) (a) This clause shall become operative only for any modification to this contract involving a pricing adjustment expected to…
  • DFARS 252.215-7004 Requirement for Submission of Data Other Than Certified Cost or Pricing Data—Modifications-Canadian Commercial Corporation.
    …ing clause: Requirement for Submission of Data Other Than Certified Cost or Pricing Data—Modifications—Canadian Commercial Corporation (OCT 2013) This clause, in lieu of FAR 52.215-21, applies only if award is to the Canadian Commercial C…
  • DFARS 204.7106 Contract modifications.
    …, in accordance with the procedures established at 204.7103, 204.7104, and 204.7105. (b) Modifications to existing contract line items or exhibit line items. (1) If the modification relates to existing contract line items or exhibit line i…
  • DFARS 243.172 Application of modifications.
    Follow the procedures in 204.1671 for determining the sequence for application of modifications to a contract or order.
  • DFARS 243.205-70 Pricing of contract modifications.
    Use the clause at 252.243-7001, Pricing of Contract Modifications, in solicitations and contracts when anticipating and using a fixed price type contract.
  • DFARS 252.243-7001 Pricing of contract modifications.
    As prescribed in 243.205-70, use the following clause: Pricing of Contract Modifications (DEC 1991) When costs are a factor in any price adjustment under this contract, the contract cost principles and procedures in FAR part 31 and DFARS …
  • FAR 4.1006 Modifications.
    (a) When a new item (such as an increased quantity) is added to the procurement instrument, assign a new line item number. (b) If the modification relates to existing line items, the modification shall refer to those items.
  • FAR 53.243 Contract modifications (SF 30).
    SF 30 (11/2016), Amendment of Solicitation/Modification of Contract. SF 30 is prescribed for use in amending invitation for bids, as specified in 14.208; modifying purchase and delivery orders, as specified in 13.302-3; and modifying contra…
  • FAR 2.101 Definitions.
    …atisfy a criterion expressed in paragraph (1) or (2) of this definition, except for— (i) Modifications of a type customarily available in the commercial marketplace; or (ii) Minor modifications of a type not customarily available in the c…
  • FAR 4.1603 Procedures.
    …upplementary PIID. Use the supplementary PIID to identify amendments to solicitations and modifications to contracts, orders, and agreements. The supplementary PIID is reported as a separate data element used in conjunction with, but not ap…
  • FAR 15.403-1 Prohibition on obtaining certified cost or pricing data (10 U.S.C. chapter 271 and 41 U.S.C. chapter 35).
    …require certified cost or pricing data to support any action (contracts, subcontracts, or modifications) (but may require data other than certified cost or pricing data as defined in FAR 2.101 to support a determination of a fair and reason…
  • FAR 15.408 Solicitation provisions and contract clauses.
    …tractor (see 15.403-4). (c) Price Reduction for Defective Certified Cost or Pricing Data—Modifications. The contracting officer shall, when contracting by negotiation, insert the clause at 52.215-11, Price Reduction for Defective Certified…
  • FAR 4.803 Contents of contract files.
    …ce of award. (26) The original of— (i) The signed contract or award; (ii) All contract modifications; and (iii) Documents supporting modifications executed by the contracting office. (27) Synopsis of award or reference thereto. (28) N…
  • FAR 52.215-1 Instructions to Offerors—Competitive Acquisition.
    …(e.g., electronic commerce or facsimile) are permitted in the solicitation, proposals and modifications to proposals shall be submitted in paper media in sealed envelopes or packages (i) addressed to the office specified in the solicitation…
  • FAR 4.201 Procedures.
    Contracting officers shall distribute copies of contracts or modifications within 10 working days after execution by all parties. As a minimum, the contracting officer shall— (a) Distribute simultaneously one signed copy or reproduction of…
  • FAR 5.705 Publicizing postaward.
    …500,000, funded in whole or in part by the Recovery Act, including— (i) Contracts; (ii) Modifications to existing contracts; (iii) Orders which are issued under task or delivery order contracts; and (iv) Modifications to orders under ta…
  • FAR 14.201-7 Contract clauses.
    …ert the clause at 52.214-27, Price Reduction for Defective Certified Cost or Pricing Data—Modifications—Sealed Bidding, in solicitations and contracts if the contract amount is expected to exceed the threshold for submission of certified co…
  • FAR 15.404-1 Proposal analysis techniques.
    …rcial products or commercial services including those “of a type” or when requiring minor modifications for commercial products. (A) The prior price must be a valid basis for comparison. If there has been a significant time lapse between t…
  • FAR 31.103 Contracts with commercial organizations.
    This category includes all contracts and contract modifications for supplies, services, or experimental, developmental, or research work negotiated with organizations other than educational institutions (see 31.104), construction and archit…
  • FAR 31.105 Construction and architect-engineer contracts.
    (a) This category includes all contracts and contract modifications negotiated on the basis of cost with organizations other than educational institutions (see 31.104), State and local governments (see 31.107), and nonprofit organizations e…
  • FAR 32.1004 Procedures.
    …ance of the event or attainment of the performance criterion. The signing of contracts or modifications, the exercise of options, the passage of time, or other such occurrences do not represent meaningful efforts or actions and shall not be…
  • FAR 42.1204 Applicability of novation agreements.
    … contracts and purchase orders and all other contracts and purchase orders, including all modifications, made between the Government and the Transferor before the effective date of this Agreement (whether or not performance and payment have…
  • FAR 43.102 Policy.
    …ing officers acting within the scope of their authority are empowered to execute contract modifications on behalf of the Government. Other Government personnel shall not— (1) Execute contract modifications; (2) Act in such a manner as to …
  • FAR 52.227-14 Rights in Data—General.
    … pertain to items, components, or processes developed at private expense, including minor modifications. Restricted computer software means computer software developed at private expense and that is a trade secret, is commercial or financi…
  • FAR 52.232-5 Payments Under Fixed-Price Construction Contracts.
    … is any action resulting in a contract, as defined in FAR subpart 2.1, including contract modifications for additional supplies or services, but not including contract modifications that are within the scope and under the terms of the contr…
  • FAR 52.232-10 Payments Under Fixed-Price Architect-Engineer Contracts.
    … is any action resulting in a contract, as defined in FAR subpart 2.1, including contract modifications for additional supplies or services, but not including contract modifications that are within the scope and under the terms of the contr…
  • FAR 52.232-16 Progress Payments.
    …tion is any action resulting in a contract, as defined in subpart 2.1, including contract modifications for additional supplies or services, but not including contract modifications that are within the scope and under the terms of the contr…
  • DFARS 204.1603 Procedures.
    … FAR 4.1603(b)(2)(ii), DoD-issued supplementary PIIDs shall, for positions 2 through 6 of modifications to contracts and agreements, comply with the following: (1) Positions 2 and 3. These two digits may be either alpha or numeric characte…
  • DFARS 215.404-72 Modified weighted guidelines method for nonprofit organizations other than FFRDCs.
    …or covered actions using the weighted guidelines method in 215.404-71, with the following modifications: (1) Modifications to performance risk (Blocks 21-23 of the DD Form 1547). (i) If the contracting officer assigns a value from the stan…
  • DFARS 217.7401 Definitions.
    …— Contract action means an action which results in a contract. (1) It includes contract modifications for additional supplies or services. (2) It includes task orders and delivery orders. (3) It does not include change orders, administr…
  • DFARS 225.870-4 Contracting procedures.
    …n that meets the thresholds specified in paragraph (c)(2)(i)(A) of this section. (C) For modifications that exceed $150,000 in contracts that meet the criteria in paragraph (c)(2)(i)(A) or (B) of this section. (D) In competitive solicitat…

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.