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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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78 sections with “Proposal modification”: the first 40

  • FAR 15.208 Submission, modification, revision, and withdrawal of proposals.
    (a) Offerors are responsible for submitting proposals, and any revisions, and modifications, so as to reach the Government office designated in the solicitation by the time specified in the solicitation. Offerors may use any transmission me…
  • FAR 52.214-23 Late submissions, modifications, revisions, and withdrawals of technical proposals under two-step sealed bidding.
    …wing provision: Late Submissions, Modifications, Revisions, and Withdrawals of Technical Proposals Under Two-Step Sealed Bidding (NOV 1999) (a) Bidders are responsible for submitting technical proposals, and any modifications or revisions…
  • DFARS 252.236-7000 Modification proposals—price breakdown.
    As prescribed in 236.570(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, wi…
  • FAR 15.203 Requests for proposals.
    (a) Requests for proposals (RFPs) are used in negotiated acquisitions to communicate Government requirements to prospective contractors and to solicit proposals. RFPs for competitive acquisitions shall, at a minimum, describe the— (1) Gove…
  • FAR 15.404-1 Proposal analysis techniques.
    (a) General. The objective of proposal analysis is to ensure that the final agreed-to price is fair and reasonable. (1) The contracting officer is responsible for evaluating the reasonableness of the offered prices. The analytical techniqu…
  • FAR 52.215-5 Facsimile Proposals.
    As prescribed in 15.209(e), insert the following provision: Facsimile Proposals (OCT 1997) (a) Definition. Facsimile proposal, as used in this provision, means a proposal, revision or modification of a proposal, or withdrawal of a proposa…
  • DFARS 252.227-7016 Rights in Bid or Proposal Information.
    …-6(e)(1), 227.7104-4(b)(1), or 227.7203-6(b), use the following clause: Rights In Bid or Proposal Information (JAN 2025) (a) Definitions. (a) Definitions. As used in this clause— Computer software is defined in— (1) The 252.227-7014, R…
  • FAR 15.001 Definitions.
    As used in this part— Deficiency is a material failure of a proposal to meet a Government requirement or a combination of significant weaknesses in a proposal that increases the risk of unsuccessful contract performance to an unacceptable …
  • FAR 31.205-18 Independent research and development and bid and proposal costs.
    … the term development, defined in this subsection. Basic research, (See 2.101). Bid and proposal (B&P) costs means the costs incurred in preparing, submitting, and supporting bids and proposals (whether or not solicited) on potential Gove…
  • FAR 52.215-1 Instructions to Offerors—Competitive Acquisition.
    …t the Contracting Officer's discretion, result in the offeror being allowed to revise its proposal. In writing, writing, or written means any worded or numbered expression that can be read, reproduced, and later communicated, and includes …
  • FAR 52.215-21 Requirements for Certified Cost or Pricing Data and Data Other Than Certified Cost or Pricing Data—Modifications.
    …fered items, or a statement that the catalog is on file in the buying office to which the proposal is being submitted. Provide a copy or describe current discount policies and price lists (published or unpublished), e.g., wholesale, origina…
  • FAR 53.215-1 Solicitation and receipt of proposals.
    …ification of Contract. SF 30, prescribed in 53.243, may be used for amending requests for proposals and for amending requests for information, as specified in 15.210(b). (c) SF 33 (Rev. 9/97), Solicitation, Offer and Award. SF 33, prescrib…
  • FAR 2.101 Definitions.
    … a general announcement of an agency's research interest including criteria for selecting proposals and soliciting the participation of all offerors capable of satisfying the Government's needs (see 6.102(d)(2)). Building or work means con…
  • FAR 3.104-1 Definitions.
    …ual, specifically in exchange for services provided by the individual. Contractor bid or proposal information means any of the following information submitted to a Federal agency as part of or in connection with a bid or proposal to enter …
  • FAR 14.201-6 Solicitation provisions.
    …on at 52.214-23, Late Submissions, Modifications, Revisions, and Withdrawals of Technical Proposals under Two-Step Sealed Bidding, in solicitations for technical proposals in step one of two-step sealed bidding. (s) Insert the provision at…
  • FAR 15.408 Solicitation provisions and contract clauses.
    …Table 15-2 of this section; (2) Use the provision with its Alternate II if copies of the proposal are to be sent to the ACO and contract auditor; (3) Use the provision with its Alternate III if submission via electronic media is required;…
  • FAR 27.409 Solicitation provisions and contract clauses
    …g officer desires to acquire unlimited rights in technical data contained in a successful proposal upon which a contract award is based, insert the clause at 52.227-23, Rights to Proposal Data (Technical). Rights to technical data in a prop…
  • FAR 42.302 Contract administration functions.
    …s. (3) Conduct post-award orientation conferences. (4) Review and evaluate contractors' proposals under subpart 15.4 and, when negotiation will be accomplished by the contracting officer, furnish comments and recommendations to that offic…
  • FAR 49.109-7 Settlement by determination.
    …l. If the contractor and TCO cannot agree on a termination settlement, or if a settlement proposal is not submitted within the period required by the termination clause, the TCO shall issue a determination of the amount due consistent with …
  • FAR 49.601-2 Letter notice.
    …exceptions in subparagraph (1) above; (iv) Provide instructions to submit any settlement proposal promptly; and (v) Request that similar notices and instructions be given to its immediate subcontractors. (4) Notify the Contracting Office…
  • FAR 52.214-28 Subcontractor Certified Cost or Pricing Data—Modifications—Sealed Bidding.
    … data (actually or by specific identification in writing), as part of the subcontractor's proposal in accordance with FAR 15.408, Table 15-2 (to include any information reasonably required to explain the subcontractor's estimating process s…
  • FAR 52.216-7 Allowable Cost and Payment.
    …l Acquisition Regulation (FAR) in effect for the period covered by the indirect cost rate proposal. (2)(i) The Contractor shall submit an adequate final indirect cost rate proposal to the Contracting Officer (or cognizant Federal agency of…
  • FAR 52.219-9 Small Business Subcontracting Plan.
    …f construction work from the small business concerns that it used in preparing the bid or proposal, in the same or greater scope, amount, and quality used in preparing and submitting the bid or proposal. Responding to a request for a quote …
  • FAR 52.230-6 Administration of Cost Accounting Standards.
    …, submit on or before a date specified by the CFAO— (1) A general dollar magnitude (GDM) proposal in accordance with paragraph (d) or (g) of this clause. The Contractor may submit a detailed cost-impact (DCI) proposal in lieu of the reques…
  • FAR 52.248-1 Value Engineering.
    …al. The Contractor is encouraged to develop, prepare, and submit value engineering change proposals (VECP's) voluntarily. The Contractor shall share in any net acquisition savings realized from accepted VECP's, in accordance with the incent…
  • DFARS 215.408 Solicitation provisions and contract clauses.
    …n of certified cost or pricing data, the contracting officer should include 252.215-7009, Proposal Adequacy Checklist, in the solicitation to facilitate submission of a thorough, accurate, and complete proposal. (5) When reasonably certain…
  • DFARS 217.7401 Definitions.
    …s that are within the scope and under the terms of the contract, e.g., engineering change proposals, value engineering change proposals, and over and above work requests as described in subpart 217.77. For policy relating to definitization …
  • FAR 30.603-1 Required changes.
    … with applicable CAS and the change is necessary to remain in compliance. (c) Notice and proposal preparation. (1) When the award of a contract would require a change to an established cost accounting practice, the provision at 52.230-7, P…
  • FAR 43.204 Administration.
    …of an equitable adjustment begins upon receipt of an adequate change order definitization proposal by the contracting officer, and ends upon the contracting officer's execution of a contractual action to definitize the change order. The con…
  • FAR 49.001 Definitions.
    …n the form of a contract modification settling all or a severable portion of a settlement proposal. Settlement proposal means a proposal for effecting settlement of a contract terminated in whole or in part, submitted by a contractor or su…
  • FAR 49.109-6 Joint settlement of two or more settlement proposals.
    …ctor, the TCO or TCO's concerned may negotiate jointly two or more termination settlement proposals of the same contractor under different contracts, even though the contracts are with different contracting offices or agencies. In such case…
  • FAR 52.248-3 Value Engineering—Construction.
    …al. The Contractor is encouraged to develop, prepare, and submit value engineering change proposals (VECP's) voluntarily. The Contractor shall share in any instant contract savings realized from accepted VECP's, in accordance with paragraph…
  • DFARS 249.7000 Terminated contracts with Canadian Commercial Corporation.
    …cers shall ensure that the Canadian Commercial Corporation submits termination settlement proposals in the format prescribed in FAR 49.602 and that they contain the amount of settlements with subcontractors. The termination contracting offi…
  • FAR 3.104-3 Statutory and related prohibitions, restrictions, and requirements.
    … subsection must not, other than as provided by law, knowingly disclose contractor bid or proposal information or source selection information before the award of a Federal agency procurement contract to which the information relates. (See …
  • FAR 4.803 Contents of contract files.
    …ned are— (i) Completed solicitation sections A, B, and K; (ii) Technical and management proposals; (iii) Cost/price proposals; and (iv) Any other pages of the solicitation that the offeror or quoter has altered or annotated. (11) Contr…
  • FAR 15.209 Solicitation provisions and contract clauses.
    …ovision with its Alternate I. (2) If the Government would be willing to accept alternate proposals, the contracting officer shall alter the basic clause to add a paragraph (c)(9) substantially the same as Alternate II. (b)(1) Except as pr…
  • FAR 19.702 Statutory requirements.
    …ceptable subcontracting plan for either the distinct portion(s) or category(ies) of their proposal for which the offeror is other than small or for the entirety of their proposal, at the offeror's discretion. When determining the need for a…
  • FAR 48.001 Definitions.
    …sition savings means savings resulting from the application of a value engineering change proposal (VECP) to contracts awarded by the same contracting office of its successor for essentially the same unit. Acquisition savings include— (1) …
  • FAR 48.103 Processing value engineering change proposals.
    (a) Instructions to the contractor for preparing a VECP and submitting it to the Government are included in paragraphs (c) and (d) of the value engineering clauses prescribed in subpart 48.2. Upon receiving a VECP, the contracting officer o…
  • FAR 49.002 Applicability.
    …inated for the convenience of a contractor whenever the settlement will be the basis of a proposal for reimbursement from the Government under a cost-reimbursement contract. (c) The contracting officer may use this part in determining an e…

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.