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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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250 sections with “Changes”: the first 40

  • FAR 15.306 Exchanges with offerors after receipt of proposals.
    (a) Clarifications and award without discussions. (1) Clarifications are limited exchanges, between the Government and offerors, that may occur when award without discussions is contemplated. (2) If award will be made without conducting di…
  • FAR 30.603-2 Unilateral and desirable changes.
    (a) Unilateral changes. (1) The contractor may unilaterally change its disclosed or established cost accounting practices, but the Government shall not pay any increased cost, in the aggregate, as a result of the unilateral change. (2) Pri…
  • FAR 30.604 Processing changes to disclosed or established cost accounting practices.
    (a) Scope. This section applies to required, unilateral, and desirable changes in cost accounting practices. (b) Procedures. Upon receipt of the contractor's notification and description of the change in cost accounting practice, the CFAO …
  • FAR 52.215-19 Notification of Ownership Changes.
    As prescribed in 15.408(k), insert the following clause: Notification of Ownership Changes (OCT 1997) (a) The Contractor shall make the following notifications in writing: (1) When the Contractor becomes aware that a change in its owners…
  • FAR 52.243-1 Changes—Fixed-Price.
    …rt the following clause. The 30-day period may be varied according to agency procedures. Changes—Fixed-Price (AUG 1987) (a) The Contracting Officer may at any time, by written order, and without notice to the sureties, if any, make change…
  • FAR 52.243-2 Changes—Cost-Reimbursement.
    …rt the following clause. The 30-day period may be varied according to agency procedures. Changes—Cost-Reimbursement (AUG 1987) (a) The Contracting Officer may at any time, by written order, and without notice to the sureties, if any, make…
  • FAR 49.114 Unsettled contract changes.
    …the TCO shall obtain from the contracting office a list of all related unsettled contract changes. The TCO shall settle, as part of final settlement, all unsettled contract changes after obtaining the recommendations of the contracting offi…
  • FAR 15.201 Exchanges with industry before receipt of proposals.
    (a) Exchanges of information among all interested parties, from the earliest identification of a requirement through receipt of proposals, are encouraged. Any exchange of information must be consistent with procurement integrity requirement…
  • FAR 52.215-9 Changes or Additions to Make-or-Buy Program.
    As prescribed in 15.408(a), insert the following clause: Changes or Additions to Make-or-Buy Program (OCT 1997) (a) The Contractor shall perform in accordance with the make-or-buy program incorporated in this contract. If the Contractor p…
  • FAR 52.230-7 Proposal Disclosure—Cost Accounting Practice Changes.
    …0.201-3(c), insert the following provision: Proposal Disclosure—Cost Accounting Practice Changes (APR 2005) The offeror shall check “yes” below if the contract award will result in a required or unilateral change in cost accounting practi…
  • FAR 52.243-4 Changes.
    …rt the following clause. The 30-day period may be varied according to agency procedures. Changes (JUN 2007) (a) The Contracting Officer may, at any time, without notice to the sureties, if any, by written order designated or indicated to …
  • FAR 52.243-5 Changes and Changed Conditions.
    As prescribed in 43.205(e), insert the following clause: Changes and Changed Conditions (APR 1984) (a) The Contracting Officer may, in writing, order changes in the drawings and specifications within the general scope of the contract. (b…
  • FAR 8.712 Specification changes.
    … shall permit them to comment before action is taken, particularly when it involves— (1) Changes that require new national stock numbers or item designations; (2) Deleting items from the supply system; (3) Standardization; or (4) Develo…
  • FAR 30.603-1 Required changes.
    …ounting practice, the provision at 52.230-7, Proposal Disclosure—Cost Accounting Practice Changes, requires the offeror to— (i) Prepare the contract pricing proposal in response to the solicitation using the changed cost accounting practic…
  • FAR 52.243-3 Changes—Time-and-Materials or Labor-Hours.
    As prescribed in 43.205(c), insert the following clause: Changes—Time-and-Materials or Labor-Hours (SEP 2000) (a) The Contracting Officer may at any time, by written order, and without notice to the sureties, if any, make changes within t…
  • FAR 52.243-7 Notification of Changes.
    As prescribed in 43.107, insert the following clause: Notification of Changes (JAN 2017) (a) Definitions. Contracting Officer, as used in this clause, does not include any representative of the Contracting Officer. Specifically Authoriz…
  • DFARS 252.217-7003 Changes.
    As prescribed in 217.7104(a), use the following clause: Changes (DEC 1991) (a) The Contracting Officer may, at any time and without notice to the sureties, by written change order, make changes within the general scope of any job order is…
  • FAR 9.207 Changes in status regarding qualification requirements.
    …vised specification imposes a new qualification requirement; (8) Manufacturing or design changes have been incorporated in the qualification requirement; (9) The source is listed in the System for Award Management Exclusions (see Subpart …
  • FAR 18.107 AbilityOne specification changes.
    Contracting officers are not held to the notification required when changes in AbilityOne specifications or descriptions are required to meet emergency needs. (See 8.712(d).)
  • FAR 43.104 Notification of contract changes.
    …at no change is considered to have occurred. (b) The clause at 52.243-7, Notification of Changes, which is prescribed in 43.107, (1) incorporates the policy expressed in paragraph (a) above; (2) requires the contractor to notify the Govern…
  • FAR 30.603 Changes to disclosed or established cost accounting practices.
  • FAR 41.402 Rate changes and regulatory intervention.
    (a) When a change is proposed to rates or terms and conditions of service to the Government, the agency shall promptly determine whether the proposed change is reasonable, justified, and not discriminatory. (b) If a change is proposed to r…
  • DFARS 215.306 Exchanges with offerors after receipt of proposals.
    (c) Competitive range. (1) For acquisitions with an estimated value of $100 million or more, contracting officers should conduct discussions. Follow the procedures at FAR 15.306(c) and (d).
  • 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 31.205-6 Compensation for personal services.
    … or within a reasonable period after it, an opportunity to review the allowability of the changes. (5) Costs that are unallowable under other paragraphs of this Subpart 31.2 are not allowable under this subsection 31.205-6 solely on the ba…
  • FAR 42.302 Contract administration functions.
    …ernment property— (i) Evaluate the contractor's requests for Government property and for changes to existing Government property and provide appropriate recommendations to the contracting officer; (ii) Ensure required screening of Governm…
  • FAR 43.205 Contract clauses.
    (a)(1) The contracting officer shall insert the clause at 52.243-1, Changes—Fixed-Price, in solicitations and contracts when a fixed-price contract for supplies is contemplated. (2) If the requirement is for services, other than architect-…
  • FAR 52.225-19 Contractor Personnel in a Designated Operational Area or Supporting a Diplomatic or Consular Mission Outside the United States.
    …d personal effects of all U.S. citizens upon the request of the Department of State. (p) Changes. In addition to the changes otherwise authorized by the Changes clause of this contract, the Contracting Officer may, at any time, by written …
  • DFARS 204.7106 Contract modifications.
    …riginal line item or subline item number may be used if the modification makes only minor changes in the specifications of some of the items ordered on the original line item or subline item and the resulting changes in unit price can be av…
  • DFARS 204.7501 Definitions.
    …evel 2 (certified third-party assessment organization (C3PAO)) assessments, with— (A) No changes in compliance with the requirements at 32 CFR part 170 since the Conditional CMMC Status date (see 32 CFR 170.16 and 170.17); and (B) A corre…
  • DFARS 252.204-7021 Contractor Compliance With the Cybersecurity Maturity Model Certification Level Requirements.
    …evel 2 (certified third-party assessment organization (C3PAO)) assessments, with— (A) No changes in compliance with the requirements at 32 CFR part 170 since the Conditional CMMC Status date (see 32 CFR 170.16 and 170.17); and (B) A corre…
  • DFARS 252.225-7040 Contractor Personnel Supporting U.S. Armed Forces Deployed Outside the United States.
    … accurate, up-to-date information throughout the deployment for all Contractor personnel. Changes to status of individual Contractor personnel relating to their in-theater arrival date and their duty location, to include closing out the dep…
  • DFARS 252.234-7002 Earned Value Management System.
    …n ANSI/EIA-748. (e) The Contractor shall submit notification of any proposed substantive changes to the EVMS procedures and the impact of those changes to the CFA. If this contract has a value of $50 million or more, unless a waiver is gra…
  • FAR 1.108 FAR conventions.
    …ive to the Government, including the dollar value of all options. (d) Application of FAR changes to solicitations and contracts. Unless otherwise specified— (1) FAR changes apply to solicitations issued on or after the effective date of t…
  • FAR 15.404-1 Proposal analysis techniques.
    …, or requiring minor modifications for commercial products, to ascertain the magnitude of changes required and to assist in pricing the required changes. (iii) Use of parametric estimating methods/application of rough yardsticks (such as d…
  • FAR 30.606 Resolving cost impacts.
    …ss all of the cost impacts are increased costs to Government: (A) One or more unilateral changes. (B) One or more noncompliances. (C) Unilateral changes and noncompliances; and (iii) May consider the cost impacts of a unilateral change …
  • FAR 43.301 Use of forms.
    …) be used for— (i) Any amendment to a solicitation; (ii) Change orders issued under the Changes clause of the contract; (iii) Any other unilateral contract modification issued under a contract clause authorizing such modification without…
  • FAR 52.204-2 Security Requirements.
    …ion or security requirements under this contract are changed by the Government and if the changes cause an increase or decrease in security costs or otherwise affect any other term or condition of this contract, the contract shall be subjec…
  • FAR 52.230-5 Cost Accounting Standards—Educational Institution.
    …accordingly. If the contract price or cost allowance of this contract is affected by such changes, adjustment shall be made in accordance with paragraph (a)(4) or (a)(5) of this clause, as appropriate. (3) Comply with all CAS, including an…
  • FAR 52.234-4 Earned Value Management System.
    …major modifications. (e) Unless a waiver is granted by the CFA, Contractor proposed EVMS changes require approval of the CFA prior to implementation. The CFA will advise the Contractor of the acceptability of such changes within 30 calenda…

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.