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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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116 sections with “effective period”: the first 40

  • 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…
  • FAR 52.245-9 Use and Charges.
    …l property. The appraisal may be used to compute rentals under this clause throughout its effective period or, if an effective period is not stated in the appraisal, for one year following the date the appraisal was performed. The Contracto…
  • 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 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 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 52.216-20 Definite Quantity.
    …finite-quantity, indefinite-delivery contract for the supplies or services specified, and effective for the period stated, in the Schedule. (b) The Government shall order the quantity of supplies or services specified in the Schedule, and …
  • FAR 52.216-21 Requirements.
    …CT 1995) (a) This is a requirements contract for the supplies or services specified, and effective for the period stated, in the Schedule. The quantities of supplies or services specified in the Schedule are estimates only and are not purc…
  • FAR 52.216-22 Indefinite Quantity.
    … (a) This is an indefinite-quantity contract for the supplies or services specified, and effective for the period stated, in the Schedule. The quantities of supplies and services specified in the Schedule are estimates only and are not pur…
  • 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 52.249-2 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…
  • 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 252.247-7002 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 7.105 Contents of written acquisition plans.
    …d tailoring of contract requirements; (ii) Select and tailor only the necessary and cost-effective requirements; and (iii) State the timeframe for identifying which of those specifications and standards, originally provided for guidance o…
  • 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 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 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 52.245-1 Government Property.
    …and maintain the processes, systems, procedures, records, and methodologies necessary for effective and efficient control of Government property. The Contractor shall disclose any significant changes to its property management system to the…
  • 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 217.7103-2 Period of agreement.
    …e contractor must continue to perform all work covered by any job order issued before the effective date of cancellation of the master agreement.
  • 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 9.506 Procedures.
    … approval or other direction by the head of the contracting activity. (e) If, during the effective period of any restriction (see 9.507), a contracting office transfers acquisition responsibility for the item or system involved, it shall n…
  • FAR 16.401 General.
    …table for use when— (i) The work to be performed is such that it is neither feasible nor effective to devise predetermined objective incentive targets applicable to cost, schedule, and technical performance; (ii) The likelihood of meeting…
  • FAR 22.1003-4 Administrative limitations, variations, tolerances, and exemptions.
    …e, and the contract shall become subject to the Service Contract Labor Standards statute, effective as of the date of the Department of Labor determination. In such case, the procedures at 29 CFR 4.123(e)(1)(iv) and 29 CFR 4.5(c) shall be f…
  • FAR 31.205-6 Compensation for personal services.
    …e of providing PRB to retirees. The assets shall be segregated in the trust, or otherwise effectively restricted, so that they cannot be used by the employer for other purposes. (C) Be calculated in accordance with generally accepted actua…
  • 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 52.203-13 Contractor Code of Business Ethics and Conduct.
    …siness ethics awareness and compliance program and internal control system, by conducting effective training programs and otherwise disseminating information appropriate to an individual's respective roles and responsibilities. (ii) The tr…
  • 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…
  • FAR 4.2104 Waivers.
    …ior agency official for supply chain risk management, responsible for ensuring the agency effectively carries out the supply chain risk management functions and responsibilities described in law, regulation, and policy; (ii) Establish part…
  • 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 12.404 Warranties.
    …tems covered by the warranty and length of warranty; (ii) The terms allow the Government effective postaward administration of the warranty to include the identification of warranted items, procedures for the return of warranted items to t…
  • FAR 16.104 Factors in selecting contract types.
    …otiating the contract type. They include the following: (a) Price competition. Normally, effective price competition results in realistic pricing, and a fixed-price contract is ordinarily in the Government's interest. (b) Price analysis. …
  • FAR 19.704 Subcontracting plan requirements.
    …9, Small Business Subcontracting Plan, except goals. Master subcontracting plans shall be effective for a 3-year period after approval by the contracting officer; however, it is incumbent upon contractors to maintain and update master subco…
  • FAR 22.1008-2 Successorship with incumbent contractor collective bargaining agreement.
    …to a collective bargaining agreement for the first time and the agreement does not become effective until after the expiration of the incumbent's contract. (2) If the incumbent contractor enters into a new or revised collective bargaining …
  • 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 48.102 Policies.
    (a) As required by 41 U.S.C. 1711, agencies shall establish and maintain cost-effective value engineering procedures and processes. Agencies shall provide contractors a substantial financial incentive to develop and submit VECP's. Contracti…
  • 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 52.212-3 Offeror Representations and Certifications—Commercial Products and Commercial Services.
    …ess (SDVOSB) concern eligible under the SDVOSB Program means an SDVOSB concern that— (1) Effective January 1, 2024, is designated in the System for Award Management (SAM) as certified by the Small Business Administration (SBA) in accordanc…

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.