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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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234 sections with “Written notice”: the first 40

  • FAR 42.801 Notice of intent to disallow costs.
    …contracting officer responsible for administering the contract may issue the contractor a written notice of intent to disallow specified costs incurred or planned for incurrence. However, before issuing the notice, the contracting officer r…
  • FAR 52.242-1 Notice of Intent To Disallow Costs.
    … of this contract— (1) The Contracting Officer may at any time issue to the Contractor a written notice of intent to disallow specified costs incurred or planned for incurrence under this contract that have been determined not to be allowa…
  • FAR 49.102 Notice of termination.
    …l. The contracting officer shall terminate contracts for convenience or default only by a written notice to the contractor (see 49.601). The notice of termination may be expedited by means of electronic communication capable of providing co…
  • FAR 2.101 Definitions.
    …ing the original contractual rights and obligations of the parties. Change order means a written order, signed by the contracting officer, directing the contractor to make a change that the Changes clause authorizes the contracting officer…
  • FAR 19.815 Release and notification requirements for non-8(a) procurement.
    …r than a mandatory source listed at 8.002 or 8.003), the contracting officer shall make a written request to, and receive concurrence from, the SBA Associate Administrator for Business Development. (c)(1) The written request to the SBA Ass…
  • FAR 22.404-6 Modifications of wage determinations.
    …ublished on the Wage Determinations at SAM.gov, or by the date the agency receives actual written notice of the modification from the Department of Labor, whichever occurs first. (Note the distinction between receipt by the agency (modifica…
  • FAR 33.104 Protests to GAO.
    … a complete copy of the protest within 1 day. (2) Immediately after receipt of the GAO's written notice that a protest has been filed, the agency shall give notice of the protest to the contractor if the award has been made, or, if no awar…
  • FAR 52.211-8 Time of Delivery.
    …tion is directed to the Contract Award provision of the solicitation that provides that a written award or acceptance of offer mailed, or otherwise furnished to the successful offeror, results in a binding contract. The Government will mail…
  • FAR 52.211-9 Desired and Required Time of Delivery.
    …tion is directed to the Contract Award provision of the solicitation that provides that a written award or acceptance of offer mailed or otherwise furnished to the successful offeror results in a binding contract. The Government will mail o…
  • FAR 52.212-4 Contract Terms and Conditions—Commercial Products and Commercial Services.
    …t. (c) Changes. Changes in the terms and conditions of this contract may be made only by written agreement of the parties. (d) Disputes. This contract is subject to 41 U.S.C. chapter 71, Contract Disputes. Failure of the parties to this c…
  • FAR 52.228-14 Irrevocable Letter of Credit.
    …dit (NOV 2014) (a) “Irrevocable letter of credit” (ILC), as used in this clause, means a written commitment by a federally insured financial institution to pay all or part of a stated amount of money, until the expiration date of the lette…
  • FAR 52.232-12 Advance Payments.
    … require. (k) Default. (1) If any of the following events occurs, the Government may, by written notice to the Contractor, withhold further withdrawals from the special account and further payments on this contract: (i) Termination of thi…
  • FAR 52.232-27 Prompt Payment for Construction Contracts.
    …within 10 days after the date the invoice amount is paid; and (C) The Contractor makes a written demand to the designated payment office for additional penalty payment, in accordance with paragraph (a)(6)(ii) of this clause, postmarked not…
  • FAR 52.243-4 Changes.
    … (a) The Contracting Officer may, at any time, without notice to the sureties, if any, by written order designated or indicated to be a change order, make changes in the work within the general scope of the contract, including changes— (1)…
  • FAR 52.245-1 Government Property.
    …dates stated in the contract, the Contracting Officer shall, upon the Contractor's timely written request, consider an equitable adjustment to the contract. (ii) In the event property is received by the Contractor, or for Government-furnis…
  • DFARS 252.227-7038 Patent Rights—Ownership by the Contractor (Large Business).
    … Before revoking or modifying the license, the agency— (A) Will furnish the Contractor a written notice of its intention to revoke or modify the license; and (B) Will allow the Contractor 30 days (or such other time as the funding agency …
  • DFARS 252.246-7001 Warranty of data.
    …1) Within a reasonable time after such notification, the Contracting Officer may— (i) By written notice, direct the Contractor to correct or replace at the Contractor's expense the nonconforming technical data promptly; or (ii) If the Con…
  • FAR 28.302 Notice of cancellation or change.
    …e Government's interest shall not be effective unless the insurer or the contractor gives written notice of cancellation or change as required by the contracting officer. When the coverage is provided by self-insurance, the contractor shall…
  • FAR 49.108-4 Authorization for subcontract settlements without approval or ratification.
    (a)(1) The TCO may, upon written request, give written authorization to the prime contractor to conclude settlements of subcontracts terminated in whole or in part without approval or ratification when the amount of settlement (see 49.002(d…
  • FAR 49.402-3 Procedure for default.
    …s predicated upon this type of failure, the contracting officer shall give the contractor written notice specifying the failure and providing a period of 10 days (or longer period as necessary) in which to cure the failure. When appropriate…
  • FAR 52.227-13 Patent Rights—Ownership by the Government.
    …s legally obligated to do so at contract award. The license is transferable only with the written approval of the agency except when transferred to the successor of that part of the Contractor's business to which the subject invention perta…
  • FAR 52.246-19 Warranty of Systems and Equipment under Performance Specifications or Design Criteria.
    …n, if any, shall be undertaken. (4) The Contractor shall promptly comply with any timely written direction from the Contracting Officer to correct or partially correct a defect, at no increase in the contract price. (5) The Contractor sha…
  • DFARS 252.234-7001 Notice of Earned Value Management System.
    …or submits a proposal in an amount less than $50,000,000— (1) The offeror shall submit a written description of the management procedures it will use and maintain in the performance of any resultant contract to comply with the requirements…
  • FAR 11.404 Contract clauses.
    …n and architect-engineering substantially as shown, or they may be changed or new clauses written. (2) The contracting officer may insert in solicitations and contracts other than those for construction and architect-engineering, a clause …
  • FAR 17.207 Exercise of options.
    (a) When exercising an option, the contracting officer shall provide written notice to the contractor within the time period specified in the contract. (b) When the contract provides for economic price adjustment and the contractor request…
  • FAR 19.306 Protesting a firm's status as a HUBZone small business concern.
    …the fifth business day after receipt of notification using other communication means when written notification is not required. (2) Any protest received after the designated time limits is untimely, unless it is from the contracting office…
  • FAR 19.308 Protesting a firm's status as an economically disadvantaged women-owned small business concern or women-owned small business concern eligible under the Women-Owned Small Business Program.
    …the fifth business day after receipt of notification using other communication means when written notification is not required. (2) Any protest received after the designated time limit is untimely, unless it is from the contracting officer…
  • FAR 27.404-5 Unauthorized, omitted, or incorrect markings.
    … or ignore the markings. (2) Agencies shall not cancel or ignore markings without making written inquiry of the contractor and affording the contractor at least 60 days to provide a written justification substantiating the propriety of the…
  • FAR 28.204-3 Irrevocable letter of credit.
    …bond. (b) The ILC shall be irrevocable, require presentation of no document other than a written demand and the ILC (and letter of confirmation, if any), expire only as provided in paragraph (f) of this subsection, and be issued/confirmed …
  • FAR 32.805 Procedure.
    …ve payment from the Government, must file with the addressees listed in 32.802(e) a— (i) Written notice of release of the contractor by the assigning financing institution; (ii) Copy of the release instrument; (iii) Written notice of the…
  • FAR 33.211 Contracting officer's decision.
    …contract administration officer or contracting office, as appropriate; and (4) Prepare a written decision that shall include— (i) A description of the claim or dispute; (ii) A reference to the pertinent contract terms; (iii) A statement…
  • FAR 52.215-1 Instructions to Offerors—Competitive Acquisition.
    …ion, 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 electronically transmitted and stor…
  • FAR 52.219-9 Small Business Subcontracting Plan.
    …he Contractor has reason to question the representations, it may accept a subcontractor's written representations of its size and socioeconomic status as a small business, small disadvantaged business, veteran-owned small business, service-…
  • FAR 52.222-27 Affirmative Action Compliance Requirements for Construction.
    …blish and maintain a current list of sources for minority and female recruitment. Provide written notification to minority and female recruitment sources and community organizations when the Contractor or its unions have employment opportun…
  • FAR 52.227-14 Rights in Data—General.
    …ical or professional journals, symposia proceedings, or similar works. The prior, express written permission of the Contracting Officer is required to assert copyright in all other data first produced in the performance of this contract. (…
  • FAR 52.236-2 Differing Site Conditions.
    …1984) (a) The Contractor shall promptly, and before the conditions are disturbed, give a written notice to the Contracting Officer of (1) subsurface or latent physical conditions at the site which differ materially from those indicated in …
  • FAR 52.243-1 Changes—Fixed-Price.
    …cedures. 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 changes within the general scope of this contract in any one or more of the following:…
  • FAR 52.243-2 Changes—Cost-Reimbursement.
    …. 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 changes within the general scope of this contract in any one or more of the following:…
  • FAR 52.244-2 Subcontracts.
    …ral Acquisition Regulation (FAR). Consent to subcontract means the Contracting Officer's written consent for the Contractor to enter into a particular subcontract. Subcontract means any contract, as defined in FAR Subpart 2.1, entered int…
  • FAR 52.246-17 Warranty of Supplies of a Noncomplex Nature.
    …ntract. (c) Remedies available to the Government. (1) The Contracting Officer shall give written notice to the Contractor of any breach of warranties in paragraph (b)(1) of this clause within ____ [Contracting Officer shall insert specific…

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.