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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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387 sections with “Contract modification”: the first 40

  • 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…
  • 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 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…
  • DFARS 204.7106 Contract modifications.
    (a) If new items are added, assign new contract line or subline item numbers or exhibit line item numbers, in accordance with the procedures established at 204.7103, 204.7104, and 204.7105. (b) Modifications to existing contract line items…
  • 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.
  • FAR 52.214-28 Subcontractor Certified Cost or Pricing Data—Modifications—Sealed Bidding.
    As prescribed in 14.201-7(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 operativ…
  • FAR 52.215-13 Subcontractor Certified Cost or Pricing Data—Modifications.
    As prescribed in 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 modi…
  • FAR 4.803 Contents of contract files.
    The following are examples of the records normally contained, if applicable, in contract files: (a) Contracting office contract file. (1) Purchase request, acquisition planning information, and other presolicitation documents. (2) Justifi…
  • FAR 4.903 Reporting contract information to the IRS.
    …ies to report certain information to the IRS. (b)(1) The required information applies to contract modifications— (i) Increasing the amount of a contract awarded before January 1, 1989, by $50,000 or more; and (ii) Entered into on or afte…
  • FAR 8.607 Performance as a subcontractor.
    Agencies shall not require a contractor, or subcontractor at any tier, to use FPI as a subcontractor for performance of a contract by any means, including means such as— (a) A solicitation provision requiring a potential contractor to offe…
  • FAR 12.301 Solicitation provisions and contract clauses for the acquisition of commercial products and commercial services.
    (a) In accordance with 41 U.S.C. 3307, contracts for the acquisition of commercial products or commercial services shall, to the maximum extent practicable, include only those clauses— (1) Required to implement provisions of law or executi…
  • FAR 14.201-7 Contract clauses.
    (a) When contracting by sealed bidding, the contracting officer shall insert the clause at 52.214-26, Audit and Records-Sealed Bidding, in solicitations and contracts as follows: (1) Use the basic clause if— (i) The acquisition will not u…
  • FAR 15.209 Solicitation provisions and contract clauses.
    When contracting by negotiation— (a) The contracting officer shall insert the provision at 52.215-1, Instructions to Offerors—Competitive Acquisition, in all competitive solicitations where the Government intends to award a contract withou…
  • FAR 15.408 Solicitation provisions and contract clauses.
    (a) Changes or Additions to Make-or-Buy Program. The contracting officer shall insert the clause at 52.215-9, Changes or Additions to Make-or-Buy Program, in solicitations and contracts when it is contemplated that a make-or- buy program wi…
  • FAR 19.705-2 Determining the need for a subcontracting plan.
    The contracting officer shall take the following actions to determine whether a proposed contractual action requires a subcontracting plan: (a)(1) Determine whether the proposed total contract-dollars will exceed the subcontracting plan th…
  • FAR 19.705-6 Postaward responsibilities of the contracting officer.
    After a contract or contract modification containing a subcontracting plan is awarded or an existing subcontracting plan is amended, the contracting officer shall do the following: (a) Notify the SBA of the award by sending a copy of the a…
  • FAR 22.404-6 Modifications of wage determinations.
    …he work in a solicitation is determined by the time of receipt of the modification by the contracting agency. Therefore, the contracting agency must annotate the modification of the project wage determination with the date and time immediat…
  • 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 31.104 Contracts with educational institutions.
    This category includes all contracts and contract modifications for research and development, training, and other work performed by educational institutions (defined as institutions of higher educations in the OMB Uniform Guidance at 2 CFR …
  • 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 32.504 Subcontracts under prime contracts providing progress payments.
    (a) Subcontracts may include either performance-based payments, provided they meet the criteria in 32.1003, or progress payments, provided they meet the criteria in subpart 32.5 for customary progress payments, but not both. Subcontracts fo…
  • FAR 42.302 Contract administration functions.
    (a) The contracting officer normally delegates the following contract administration functions to a CAO. The contracting officer may retain any of these functions, except those in paragraphs (a)(5), (a)(9), (a)(11), and (a)(12) of this sect…
  • FAR 45.402 Title to contractor-acquired property.
    (a) Title vests in the Government for all property acquired or fabricated by the contractor in accordance with the financing provisions or other specific requirements for passage of title in the contract. Under fixed-price type contracts, i…
  • FAR 47.303-17 Contractor-prepaid commercial bills of lading, small package shipments.
    (a) If it is advantageous to the Government, the contracting officer may authorize the contractor to ship supplies, which have been acquired f.o.b. origin, to domestic destinations, including DOD air and water terminals, by common carriers …
  • FAR 52.215-12 Subcontractor Certified Cost or Pricing Data.
    As prescribed in 15.408(d)(1), insert the following clause: Subcontractor Certified Cost or Pricing Data (JUN 2020) (a) Before awarding any subcontract expected to exceed the threshold for submission of certified cost or pricing data in F…
  • FAR 52.219-9 Small Business Subcontracting Plan.
    As prescribed in 19.708(b), insert the following clause: Small Business Subcontracting Plan (JAN 2025) (a) This clause does not apply to small business concerns. (b) Definitions. As used in this clause— Alaska Native Corporation (ANC) m…
  • FAR 52.222-41 Service Contract Labor Standards.
    As prescribed in 22.1006(a), insert the following clause: Service Contract Labor Standards (AUG 2018) (a) Definitions. As used in this clause— Contractor when this clause is used in any subcontract, shall be deemed to refer to the subcon…
  • FAR 52.232-5 Payments Under Fixed-Price Construction Contracts.
    …ed in 32.111(a)(5), insert the following clause: Payments Under Fixed-Price Construction Contracts (MAY 2014) (a) Payment of price. The Government shall pay the Contractor the contract price as provided in this contract. (b) Progress pay…
  • FAR 52.232-7 Payments under Time-and-Materials and Labor-Hour Contracts.
    …111(a)(7), insert the following clause: Payments Under Time-and-Materials and Labor-Hour Contracts (NOV 2021) The Government will pay the Contractor as follows upon the submission of vouchers approved by the Contracting Officer or the aut…
  • FAR 52.232-10 Payments Under Fixed-Price Architect-Engineer Contracts.
    …32.111(c)(1), insert the following clause: Payments Under Fixed-Price Architect-Engineer Contracts (APR 2010) (a) Estimates shall be made monthly of the amount and value of the work and services performed by the Contractor under this cont…
  • DFARS 212.301 Solicitation provisions and contract clauses for the acquisition of commercial products and commercial services.
    …7301. (f) The following additional provisions and clauses apply to DoD solicitations and contracts using FAR part 12 procedures for the acquisition of commercial products and commercial services. If the offeror has completed any of the fol…
  • DFARS 249.7000 Terminated contracts with Canadian Commercial Corporation.
    (a) Terminate contracts with the Canadian Commercial Corporation in accordance with— (1) The Letter of Agreement (LOA) between the Department of Defence Production (Canada) and the U.S. DoD, “Canadian Agreement” (for a copy of the LOA or f…
  • DFARS 252.236-7000 Modification proposals—price breakdown.
    …a), use the following clause: Modification Proposals—Price Breakdown (DEC 1991) (a) The Contractor shall furnish a price breakdown, itemized as required and within the time specified by the Contracting Officer, with any proposal for a con…
  • FAR 4.804-5 Procedures for closing out contract files.
    (a) The contract administration office is responsible for initiating (automated or manual) administrative closeout of the contract after receiving evidence of its physical completion. At the outset of this process, the contract administrati…
  • FAR 13.302-3 Obtaining contractor acceptance and modifying purchase orders.
    (a) When it is desired to consummate a binding contract between the parties before the contractor undertakes performance, the contracting officer shall require written (see 2.101) acceptance of the purchase order by the contractor. (b) Eac…
  • FAR 15.208 Submission, modification, revision, and withdrawal of proposals.
    …sals is “late” and will not be considered unless it is received before award is made, the contracting officer determines that accepting the late proposal would not unduly delay the acquisition; and— (i) If it was transmitted through an ele…
  • FAR 15.404-3 Subcontract pricing considerations.
    (a) The contracting officer is responsible for the determination of a fair and reasonable price for the prime contract, including subcontracting costs. The contracting officer should consider whether a contractor or subcontractor has an app…
  • FAR 16.503 Requirements contracts.
    (a) Description. A requirements contract provides for filling all actual purchase requirements of designated Government activities for supplies or services during a specified contract period (from one contractor), with deliveries or perform…
  • FAR 19.301-2 Rerepresentation by a contractor that represented its status as a small business concern.
    (a) Definition. As used in this subsection— Long-term contract means a contract of more than five years in duration, including options. However, the term does not include contracts that exceed five years in duration because the period of p…
  • FAR 19.708 Contract clauses.
    …sert the clause at 52.219-8, Utilization of Small Business Concerns, in solicitations and contracts when the contract amount is expected to exceed the simplified acquisition threshold unless— (1) A personal services contract is contemplate…

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.