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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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153 sections with “changes clause”: the first 40

  • 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 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 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 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 52.215-19 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 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 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 237.7204 Format and clauses for educational service agreements.
    …nt annually before the anniversary of its effective date for the purpose of incorporating changes required by statutes, executive orders, the Federal Acquisition Regulation, or the Defense Federal Acquisition Regulation Supplement. Changes …
  • 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…
  • 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 52.215-9 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 52.230-5 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 52.243-4 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 52.245-1 Government Property.
    …r has the option to take over under any type of contract, e.g., as a result either of any changes in the specifications or plans thereunder or of the termination of the contract (or subcontract thereunder), before completion of the work, fo…
  • DFARS 252.217-7007 Payments.
    …be based on the price of the job order as adjusted as a result of change orders under the Changes clause of the Master Agreement. If the Contracting Officer does not so direct— (1) Payments of any increases shall be made from time to time …
  • 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 43.103 Types of contract modifications.
    …ing officer. Unilateral modifications are used, for example, to— (1) Make administrative changes; (2) Issue change orders; (3) Make changes authorized by clauses other than a changes clause (e.g., Property clause, Options clause, or Susp…
  • FAR 43.107 Contract clause.
    …cer may insert a clause substantially the same as the clause at 52.243-7, Notification of Changes, in solicitations and contracts. The clause is available for use primarily in negotiated research and development or supply contracts for the …
  • FAR 52.209-3 First Article Approval—Contractor Testing.
    …e tests. After each request for additional tests, the Contractor shall make any necessary changes, modifications, or repairs to the first article or select another first article for testing. All costs related to these tests are to be borne …
  • FAR 52.209-4 First Article Approval—Government Testing.
    …al first article for testing. After each request, the Contractor shall make any necessary changes, modifications, or repairs to the first article or select another first article for testing. All costs related to these tests are to be borne …
  • FAR 52.230-2 Cost Accounting Standards.
    …accordingly. If the contract price or cost allowance of this contract is affected by such changes, adjustment shall be made in accordance with subparagraph (a)(4) or (a)(5) of this clause, as appropriate. (3) Comply with all CAS, including…
  • 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 252.204-7021 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 252.217-7003 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…
  • 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 2.101 Definitions.
    …er, signed by the contracting officer, directing the contractor to make a change that the Changes clause authorizes the contracting officer to order without the contractor's consent. Chief Acquisition Officer means an executive level acqui…
  • FAR 5.001 Definition.
    …the terms of the existing contract, such as contract modifications issued pursuant to the Changes clause, or funding and other administrative changes.
  • 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 9.307 Government administration procedures.
    …e first article shipment number, when available, and the applicable line item number. Any changes in the drawings, designs, or specifications determined by the contracting officer to be necessary shall be made under the Changes clause, and …
  • FAR 16.203-4 Contract clauses.
    …racting officer shall— (i) Consider work in process and materials on hand at the time of changes in labor rates, including fringe benefits (if any) or material prices; (ii) Not include in adjustments any indirect cost (except fringe benef…
  • FAR 16.402-2 Performance incentives.
    …essential that the Government and contractor agree explicitly on the effect that contract changes (e.g., pursuant to the Changes clause) will have on performance incentives. (h) The contracting officer must exercise care, in establishing p…
  • FAR 32.001 Definitions.
    …the terms of the existing contract, such as contract modifications issued pursuant to the Changes clause, or funding and other administrative changes. Contract financing payment means an authorized Government disbursement of monies to a co…
  • FAR 32.206 Solicitation provisions and contract clauses.
    …rcial Products and Commercial Services, in the event the contractor's financial condition changes and is found not to be adequate security. (d) Instructions for multiple appropriations. If contract financing is to be computed for the contr…
  • 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 (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.