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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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168 sections with “Effective date”: the first 40

  • FAR 32.904 Determining payment due dates.
    …nt amount is subject to contract settlement actions, acceptance is deemed to occur on the effective date of the contract settlement. (B) For the sole purpose of computing an interest penalty that might be due the contractor— (1) Governmen…
  • FAR 2.101 Definitions.
    …can also mean the furnishing of professional advice or assistance rendered to improve the effectiveness of Federal management processes or procedures (including those of an engineering and technical nature). In rendering the foregoing servi…
  • FAR 42.1204 Applicability of novation agreements.
    …d transferee stating that the transfer was properly effected under applicable law and the effective date of transfer. (6) Balance sheets of the transferor and transferee as of the dates immediately before and after the transfer of assets, …
  • FAR 43.101 Definitions.
    …e rights of the parties (e.g., a change in the paying office or the appropriation data). Effective date means— (1) For a solicitation amendment, change order, or administrative change, the effective date shall be the issue date of the ame…
  • FAR 49.601-2 Letter notice.
    …me and address of company, contract number of terminated contract, line items, etc.] (a) Effective date of termination. This confirms the Government's electronic notice to you dated ______________________, 20____, terminating _____________…
  • FAR 52.216-2 Economic Price Adjustment—Standard Supplies.
    …ctor. (b) The Contractor shall promptly notify the Contracting Officer of the amount and effective date of each decrease in any applicable established price. Each corresponding contract unit price shall be decreased by the same percentage …
  • FAR 52.216-3 Economic Price Adjustment—Semistandard Supplies.
    …tice. (b) The Contractor shall promptly notify the Contracting Officer of the amount and effective date of each decrease in any applicable established price. Each corresponding contract unit price (exclusive of any part of the unit price t…
  • FAR 52.216-4 Economic Price Adjustment—Labor and Material.
    …e, in the form required by the Contracting Officer, supporting data explaining the cause, effective date, and amount of the increase or decrease and the amount of the Contractor's adjustment proposal. (b) Promptly after the Contracting Off…
  • FAR 52.227-11 Patent Rights—Ownership by the Contractor.
    … the Secretary's review discloses that the Contractor could take reasonable steps to more effectively implement the requirements of paragraph (i)(4) of this clause. (j) Communications. [Complete according to agency instructions.] (k) Subc…
  • FAR 52.241-7 Change in Rates or Terms and Conditions of Service for Regulated Services.
    … shall forward to the Contracting Officer a copy of such changes within 15 days after the effective date thereof. The Contractor agrees to continue furnishing service under this contract in accordance with the amended tariff, and the Govern…
  • FAR 52.249-2 Termination for Convenience of the Government (Fixed-Price).
    …ng to the Contractor a Notice of Termination specifying the extent of termination and the effective date. (b) After receipt of a Notice of Termination, and except as directed by the Contracting Officer, the Contractor shall immediately pro…
  • FAR 52.249-3 Termination for Convenience of the Government (Dismantling, Demolition, or Removal of Improvements).
    …ng to the Contractor a Notice of Termination specifying the extent of termination and the effective date. Upon receipt of the notice, if title to property is vested in the Contractor under this contract, it shall revest in the Government re…
  • FAR 52.249-6 Termination (Cost-Reimbursement).
    …f the Contractor or for convenience of the Government, the extent of termination, and the effective date. If, after termination for default, it is determined that the Contractor was not in default or that the Contractor's failure to perform…
  • FAR 53.243 Contract modifications (SF 30).
    …15.210(b). Pending the publication of a new edition of the form, Instruction (b), Item 3 (effective date), is revised in paragraphs (3) and (5) as follows: (b) Item 3 (effective date). (3) For a modification issued as a confirming notice …
  • DFARS 225.7004-6 Waiver of restrictions.
    …egister and submitted to the congressional defense committees at least 15 days before the effective date of the waiver. (iii) The effective period of the waiver shall not exceed 1 year. (iv) For contracts entered into prior to the effecti…
  • DFARS 237.7204 Format and clauses for educational service agreements.
    …med. 4. The Government will review this agreement 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 Fed…
  • DFARS 252.216-7000 Economic Price Adjustment—Basic Steel, Aluminum, Brass, Bronze, or Copper Mill Products.
    …rice. (c) The Contractor shall promptly notify the Contracting Officer of the amount and effective date of each decrease in any established price. (1) Each corresponding contract unit price shall be decreased by the same percentage that t…
  • DFARS 252.247-7002 Revision of prices.
    …ter the date of this contract, and thereafter neither party shall make a demand having an effective date within 90 days of the effective date of any prior demand. However, this limitation does not apply to a wage adjustment during the 90 da…
  • FAR 52.227-13 Patent Rights—Ownership by the Government.
    …ion, disclosures, and reports. (1) The Contractor shall establish and maintain active and effective procedures to educate its employees in order to assure that subject inventions are promptly identified and disclosed to Contractor personnel…
  • FAR 52.249-5 Termination for Convenience of the Government (Educational and Other Nonprofit Institutions).
    …ng to the Contractor a Notice of Termination specifying the extent of termination and the effective date. (b) After receipt of a Notice of Termination and except as directed by the Contracting Officer, the Contractor shall immediately proc…
  • DFARS 252.216-7003 Economic price adjustment—wage rates or material prices controlled by a foreign government.
    …stablished wage rates or material prices, the increase in contract unit price(s) shall be effective on the same date that the government named in paragraph (a) of this clause increased the applicable wage rate(s) or material price(s), but o…
  • DFARS 252.227-7038 Patent Rights—Ownership by the Contractor (Large Business).
    …hts in this invention.” (5) The Contractor shall— (i) Establish and maintain active and effective procedures to ensure that subject inventions are promptly identified and disclosed to Contractor personnel responsible for patent matters; …
  • FAR 1.108 FAR conventions.
    …nless otherwise specified— (1) FAR changes apply to solicitations issued on or after the effective date of the change; (2) Contracting officers may, at their discretion, include the FAR changes in solicitations issued before the effective…
  • FAR 22.404-6 Modifications of wage determinations.
    …chever occurs first. (Note the distinction between receipt by the agency (modification is effective) and receipt by the contracting officer, which may occur later.) During the course of the solicitation, the contracting officer shall monito…
  • FAR 22.1904 Annual Executive Order Minimum Wage Rate.
    (a) For the E.O. minimum wage rate that becomes effective on January 30, 2022, and annually thereafter, the Administrator will— (1) Notify the public of the new E.O. minimum wage rate at least 90 days before it becomes effective by publish…
  • FAR 42.1205 Agreement to recognize contractor's change of name.
    …tating that the change of name was properly effected under applicable law and showing the effective date. (3) A list of all affected contracts and purchase orders remaining unsettled between the contractor and the Government, showing for e…
  • FAR 52.207-5 Option To Purchase Equipment.
    …y exercise this option only by providing a unilateral modification to the Contractor. The effective date of the purchase will be specified in the unilateral modification and may be any time during the period of the contract, including any e…
  • FAR 52.216-5 Price Redetermination—Prospective.
    …except that (1) the prices for supplies delivered and services performed before the first effective date of price redetermination (see paragraph (c) below) shall remain fixed and (2) in no event shall the total amount paid under this contra…
  • DFARS 204.1671 Order of application for modifications.
    …ill be applied in the following order— (1) Modifications will be applied in order of the effective date on the modification; (2) In the event of two or more modifications with the same effective date, modifications will be applied in sign…
  • FAR 4.1603 Procedures.
    …ocurement instrument is issued or awarded. This is the date the action is signed, not the effective date if the effective date is different. (3) Position 9. Indicate the type of instrument by entering one of the following upper case letter…
  • FAR 8.707 Prices.
    …y to all orders received by the AbilityOne participating nonprofit agency on or after the effective date of the change. In special cases, after considering the views of the ordering office, the Committee may make price changes applicable to…
  • FAR 9.406-3 Procedures.
    …) Specifying the reasons for debarment; (iii) Stating the period of debarment, including effective dates; and (iv) Advising that the debarment is effective throughout the executive branch of the Government unless the head of an agency or …
  • FAR 17.602 Policy.
    …f they are consistent with the situations described in 17.604. (c) Within 2 years of the effective date of this regulation, agencies shall review their current contractual arrangements in the light of the guidance of this subpart, in order…
  • FAR 19.811-1 Sole source.
    …The following items shall be inserted by the SBA— (i) The SBA contract number. (ii) The effective date. (iii) The typed name of the SBA's contracting officer. (iv) The signature of the SBA's contracting officer. (v) The date signed. (…
  • FAR 22.404-1 Types of wage determinations.
    … of Labor. Once incorporated in a contract, a general wage determination normally remains effective for the life of the contract, unless the contracting officer exercises an option to extend the term of the contract (see 22.404-12). These d…
  • FAR 22.1012-1 Prevailing wage determinations.
    …d to the contracting officer within the timeframes prescribed at 22.1012-1(b) and (c) are effective and must be included in the resulting contract. Monitoring can be accomplished by use of the Wage Determinations at SAM.gov website's “Alert…
  • FAR 31.205-42 Termination costs.
    …nable efforts by the contractor, costs which cannot be discontinued immediately after the effective date of termination are generally allowable. However, any costs continuing after the effective date of the termination due to the negligent …
  • FAR 49.302 Discontinuance of vouchers.
    …al) after the last day of the sixth month following the month in which the termination is effective. The contractor may elect to stop using vouchers at any time during the 6-month period. When the contractor has vouchered out all costs with…
  • FAR 52.222-32 Construction Wage Rate Requirements—Price Adjustment (Actual Method).
    …s statute by the Administrator, Wage and Hour Division, U.S. Department of Labor, that is effective for an option to extend the term of the contract, will apply to that option period. (b)(1) The Contractor states that if the prices in this…
  • FAR 52.222-41 Service Contract Labor Standards.
    …sued solely as a result of a finding of substantial variance, such determination shall be effective as of the date of the final administrative decision. (g) Notification to Employees. The Contractor and any subcontractor under this contrac…

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.