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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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119 sections with “substitute”: the first 40

  • FAR 52.243-1 Changes—Fixed-Price.
    …n architect-engineer or other professional services, and no supplies are to be furnished, substitute the following paragraph (a) for paragraph (a) of the basic clause: (a) The Contracting Officer may at any time, by written order, and with…
  • FAR 52.216-7 Allowable Cost and Payment.
    …atent liability. (End of clause) Alternate I (FEB 1997). As prescribed in 16.307(a)(2), substitute the following paragraph (b)(1)(iii) for paragraph (b)(1)(iii) of the basic clause: (b)(1)(iii) The amount of progress and other payments t…
  • FAR 52.219-9 Small Business Subcontracting Plan.
    …mercial plan. (End of clause) Alternate I (NOV 2016). As prescribed in 19.708(b)(1)(i), substitute the following paragraph (c)(1) for paragraph (c)(1) of the basic clause: (c)(1) The apparent low bidder, upon request by the Contracting O…
  • FAR 52.243-2 Changes—Cost-Reimbursement.
    …ate I (APR 1984). If the requirement is for services and no supplies are to be furnished, substitute the following paragraph (a) for paragraph (a) of the basic clause: (a) The Contracting Officer may at any time, by written order, and with…
  • FAR 52.245-1 Government Property.
    …ncrease or decrease the amount of Government-furnished property under this contract; (B) Substitute other Government-furnished property for the property previously furnished, to be furnished, or to be acquired by the Contractor for the Gov…
  • FAR 52.249-6 Termination (Cost-Reimbursement).
    …ude a fee. (End of clause) Alternate I (SEP 1996). If the contract is for construction, substitute the following subparagraph (h)(4) for subparagraph (h)(4) of the basic clause: (h)(4) A portion of the fee payable under the contract dete…
  • FAR 52.249-10 Default (Fixed-Price Construction).
    …I (APR 1984). If the contract is for dismantling, demolition, or removal of improvements, substitute the following paragraph (a) for paragraph (a) of the basic clause: (a)(1) If the Contractor refuses or fails to prosecute the work, or any…
  • FAR 32.502-4 Contract clauses.
    …e agency approval has been given in accordance with 32.501-1, the contracting officer may substitute a different customary rate for other than small business concerns for the progress payment and liquidation rate indicated. (3) If an unusu…
  • FAR 52.216-21 Requirements.
    …s that exceed a specific Government activity's internal capability to produce or perform, substitute the following paragraph (c) for paragraph (c) of the basic clause: (c) The estimated quantities are not the total requirements of the Gove…
  • FAR 52.222-33 Notice of Requirement for Project Labor Agreement.
    …ith its offer. (End of provision) Alternate I (JAN 2024) As prescribed in 22.505(a)(2), substitute the following paragraphs (b) and (e) for paragraphs (b) and (e) of the basic provision. (b) The apparent successful offeror shall— (1) Ne…
  • FAR 52.225-3 Buy American—Free Trade Agreements—Israeli Trade Act.
    …se) Alternate I [Reserved] Alternate II (JAN 2025). As prescribed in 25.1101(b)(1)(ii), substitute the following paragraph (c) for paragraph (c) of the basic clause: (c) Delivery of end products. 41 U.S.C. chapter 83 provides a preferenc…
  • FAR 52.232-12 Advance Payments.
    …administering office. Alternate II (MAY 2001). If used in a cost-reimbursement contract, substitute the following paragraphs (c) and (e), and subparagraphs (f)(1) and (f)(2) for paragraphs (c) and (e) and subparagraphs (f) (1) and (2) of t…
  • DFARS 223.7305 Authorization and approval.
    (a) The prohibition in 223.7303 does not apply to critical defense applications if no substitute can meet performance requirements. The DoD policy of April 8, 2009, “Minimizing the Use of Hexavalent Chromium,” contains requirements for weig…
  • DFARS 252.232-7007 Limitation of Government's obligation.
    …lotment of funds identified in paragraph (j) of this clause, or to a mutually agreed upon substitute date. The notification will also advise the Contracting Officer of the estimated amount of additional funds that will be required for the t…
  • FAR 13.302-5 Clauses.
    …uirement is deleted. Also, do not delete a paragraph without providing for an appropriate substitute. (3)(i) When an acquisition for supplies for use within the United States cannot be set aside for small business concerns and trade agreem…
  • FAR 15.102 Oral presentations.
    (a) Oral presentations by offerors as requested by the Government may substitute for, or augment, written information. Use of oral presentations as a substitute for portions of a proposal can be effective in streamlining the source selectio…
  • FAR 25.1102 Acquisition of construction.
    …atute. (2) If the head of the agency determines that a higher percentage is appropriate, substitute the higher evaluation percentage in paragraph (b)(3)(i) of the clause. (3) The contracting officer shall use the clause with its Alternate…
  • FAR 28.203-2 Substitution of assets.
    An individual surety may request the Government to accept a substitute asset for that currently pledged by submitting a written request, including a revised SF 28, to the responsible contracting officer. Following the requirements set forth…
  • FAR 28.204 Alternatives in lieu of corporate or individual sureties.
    … During the period for which a bond supported by security is required, the contractor may substitute one type of security listed in 28.204-1 through 28.204-3 for another, or may substitute, in whole or combination, additional surety bonds u…
  • FAR 28.204-3 Irrevocable letter of credit.
    …(d) If the contractor does not furnish an acceptable replacement ILC, or other acceptable substitute, at least 30 days before an ILC's scheduled expiration, the contracting officer shall immediately draw on the ILC. (e) If, after the perio…
  • FAR 52.204-30 Federal Acquisition Supply Chain Security Act Orders—Prohibition.
    …o the contract and all subcontracts. Alternate I (DEC 2023). As prescribed in 4.2306(c), substitute the following paragraph (b)(1) for paragraph (b)(1) of the basic clause: (b) Prohibition. (1) Contractors are prohibited from providing or…
  • FAR 52.211-8 Time of Delivery.
    …or specific periods and is based on an assumed date of award, the contracting officer may substitute the following paragraph (b) for paragraph (b) of the basic clause. The time may be expressed by substituting on or before; during the month…
  • FAR 52.211-9 Desired and Required Time of Delivery.
    …or specific periods and is based on an assumed date of award, the contracting officer may substitute the following paragraph (b) for paragraph (b) of the basic clause. The time may be expressed by substituting on or before; during the month…
  • FAR 52.212-3 Offeror Representations and Certifications—Commercial Products and Commercial Services.
    …rnate II. If Alternate II to the clause at FAR 52.225-3 is included in this solicitation, substitute the following paragraph (g)(1)(ii) for paragraph (g)(1)(ii) of the basic provision: (g)(1)(ii) The offeror certifies that the following su…
  • FAR 52.215-2 Audit and Records—Negotiation.
    … prime contract. (End of clause) Alternate I (MAR 2009). As prescribed in 15.209(b)(2), substitute the following paragraphs (d)(1) and (g) for paragraphs (d)(1) and (g) of the basic clause: (d) Comptroller General or Inspector General. (…
  • FAR 52.222-34 Project Labor Agreement.
    …ruction project. (End of clause) Alternate I (JAN 2024). As prescribed in 22.505(b)(2), substitute the following paragraphs (b) through (f) for paragraphs (b) and (c) of the basic clause: (b) The Contractor shall— (1) Negotiate or becom…
  • FAR 52.225-4 Buy American—Free Trade Agreements—Israeli Trade Act Certificate.
    …on) Alternate I [Reserved] Alternate II (JAN 2025). As prescribed in 25.1101(b)(2)(ii), substitute the following paragraph (b) for paragraph (b) of the basic provision: (b) The offeror certifies that the following supplies are Israeli en…
  • FAR 52.225-11 Buy American—Construction Materials Under Trade Agreements.
    …raini, Mexican, or Omani construction material” to paragraph (a) of the basic clause, and substitute the following paragraphs (b)(1) and (b)(2) for paragraphs (b)(1) and (b)(2) of the basic clause: Bahraini, Mexican, or Omani construction …
  • FAR 52.225-12 Notice of Buy American Requirement—Construction Materials Under Trade Agreements.
    …egotiations. (End of provision) Alternate I (MAY 2014). As prescribed in 25.1102(d)(2), substitute the following paragraph (b) for paragraph (b) of the basic provision: (b) Requests for determination of inapplicability. An offeror reques…
  • FAR 52.225-24 Notice of Required Use of American Iron, Steel, and Manufactured Goods—Buy American Statute—Construction Materials Under Trade Agreements.
    …g negotiations. (End of provision) Alternate I (MAY 2014). As prescribed in 25.1102(e), substitute the following paragraph (b) for paragraph (b) of the basic provision: (b) Requests for determination of inapplicability. An offeror reques…
  • FAR 52.227-1 Authorization and Consent.
    …n and consent. (End of clause) Alternate I (APR 1984). As prescribed in 27.201-2(a)(2), substitute the following paragraph (a) for paragraph (a) of the basic clause: (a) The Government authorizes and consents to all use and manufacture o…
  • FAR 52.227-14 Rights in Data—General.
    … the Government. (End of clause) Alternate I (DEC 2007). As prescribed in 27.409(b)(2), substitute the following definition for limited rights data in paragraph (a) of the basic clause: Limited rights data means data, other than computer…
  • FAR 52.233-3 Protest After Award.
    …and the Government. (End of clause) Alternate I (JUN 1985). As prescribed in 33.106(b), substitute in paragraph (a)(2) the words “the Termination clause of this contract” for the words “the Default, or the Termination for Convenience of t…
  • FAR 52.242-15 Stop-Work Order.
    …se) Alternate I (APR 1984). If this clause is inserted in a cost-reimbursement contract, substitute in paragraph (a)(2) the words “the Termination clause of this contract” for the words “the Default, or the Termination for Convenience of t…
  • FAR 52.246-2 Inspection of Supplies—Fixed-Price.
    … of clause) Alternate I (JUL 1985). If a fixed-price incentive contract is contemplated, substitute paragraphs (g), (h), and (l) below for paragraphs (g), (h), and (l) of the basic clause. (g) The Contractor shall remove supplies rejected…
  • FAR 52.246-17 Warranty of Supplies of a Noncomplex Nature.
    …ight be the case if, for example, the cost of a warranty would otherwise be prohibitive), substitute a paragraph substantially the same as the following paragraph (b)(2) for paragraph (b)(2) of the basic clause: (2) If correction or replac…
  • FAR 52.247-51 Evaluation of Export Offers.
    …orts of export are DOD water terminals, delete paragraph (a) from the basic provision and substitute for it the following paragraph (a): (a) Port handling and ocean charges—DOD water terminals. The port handling and ocean charges are set f…
  • FAR 52.247-64 Preference for Privately Owned U.S.-Flag Commercial Vessels.
    …e: 202-366-4610. (End of clause) Alternate I (APR 2003). As prescribed in 47.507(a)(2), substitute the following paragraphs (a) and (b) for paragraphs (a) and (b) of the basic clause: (a) Except as provided in paragraphs (b) and (e) of t…
  • FAR 52.248-1 Value Engineering.
    …4). If the contracting officer selects a mandatory value engineering program requirement, substitute the following paragraph (a) for paragraph (a) of the basic clause: (a) General. The Contractor shall (1) engage in a value engineering pro…
  • FAR 52.249-2 Termination for Convenience of the Government (Fixed-Price).
    …documents. (End of clause) Alternate I (SEP 1996). If the contract is for construction, substitute the following paragraph (g) for paragraph (g) of the basic clause: (g) If the Contractor and Contracting Officer fail to agree on the whol…

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.