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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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189 sections with “supplement”: the first 40

  • FAR 4.1602 Identifying the PIID and supplementary PIID.
    …ion. Identify the PIID for all solicitations. For amendments to solicitations, identify a supplementary PIID, in conjunction with the PIID for the solicitation. (2) Contracts and purchase orders. Identify the PIID for contracts and purchas…
  • DFARS 252.231-7000 Supplemental cost principles.
    As prescribed in 231.100-70, use the following clause: Supplemental Cost Principles (DEC 1991) When the allowability of costs under this contract is determined in accordance with part 31 of the Federal Acquisition Regulation (FAR), allowa…
  • FAR 42.302 Contract administration functions.
    …d disclosure statements, if applicable; and (iv) Negotiate price adjustments and execute supplemental agreements under the Cost Accounting Standards clauses at 48 CFR 52.230-2, 52.230-3, 52.230-4, 52.230-5, and 52.230-6. (12) Determine th…
  • FAR 52.101 Using part 52.
    …strates the makeup of the FAR provision or clause number: (2) Provisions or clauses that supplement the FAR. (i) Provisions or clauses that supplement the FAR are— (A) Prescribed and included in authorized agency acquisition regulations i…
  • FAR 52.107 Provisions and clauses prescribed in subpart 52.1.
    …rovision at 52.252-3, Alterations in Solicitation, in solicitations in order to revise or supplement, as necessary, other parts of the solicitation that apply to the solicitation phase only, except for any provision authorized for use with …
  • DFARS 201.303 Publication and codification.
    …Federal Regulations. (ii) To the extent possible, all DFARS text (whether implemental or supplemental) is numbered as if it were implemental. Supplemental numbering is used only when the text cannot be integrated intelligibly with its FAR …
  • DFARS 252.219-7003 Small Business Subcontracting Plan (DoD Contracts).
    …clause: Small Business Subcontracting Plan (DoD Contracts)—BASIC (DEC 2019) This clause supplements the Federal Acquisition Regulation 52.219-9, Small Business Subcontracting Plan, clause of this contract. (a) Definition. As used in this…
  • DFARS 252.225-7035 Buy American—Free Trade Agreements—Balance of Payments Program Certificate.
    …ith the policies and procedures of part 225 of the Defense Federal Acquisition Regulation Supplement; and (2) For line items subject to Buy American—Free Trade Agreements—Balance of Payments Program—Basic clause of this solicitation, will …
  • DFARS 252.225-7036 Buy American—Free Trade Agreements—Balance of Payments Program.
    …e is established for a contract in accordance with Defense Federal Acquisition Regulation Supplement (DFARS) 225.101(d); or award is made before January 1, 2030, for a foreign end product that exceeds 55 percent domestic content (see DFARS …
  • FAR 1.301 Policy.
    …d may issue or authorize the issuance of agency acquisition regulations that implement or supplement the FAR and incorporate, together with the FAR, agency policies, procedures, contract clauses, solicitation provisions, and forms that gove…
  • FAR 2.101 Definitions.
    …nstance for which, in the determination of the President, Federal assistance is needed to supplement State and local efforts and capabilities to save lives and to protect property and public health and safety, or to lessen or avert the thre…
  • FAR 4.1603 Procedures.
    …properly configured PIID using four characters in the final positions: (b) Elements of a supplementary PIID. Use the supplementary PIID to identify amendments to solicitations and modifications to contracts, orders, and agreements. The sup…
  • FAR 27.303 Contract clauses.
    …ation is not required elsewhere in the contract, and unless otherwise specified by agency supplemental regulations, the contracting officer may modify 52.227-11(e) or otherwise supplement the clause to require the contractor to do one or mo…
  • FAR 43.204 Administration.
    … change orders are not forward priced, they require two documents: the change order and a supplemental agreement reflecting the resulting equitable adjustment in contract terms. If an equitable adjustment in the contract price or delivery t…
  • DFARS 204.1603 Procedures.
    …ion 10 to identify the solicitation as a commercial solutions opening. (b) Elements of a supplementary PIID. In addition to the supplementary PIID numbering procedures in FAR 4.1603(b), follow the procedures contained in paragraphs (b)(2)(…
  • FAR 31.205-6 Compensation for personal services.
    …r early retirement benefits in paragraph (j)(6) of this subsection, one-time-only pension supplements not available to all participants of the basic plan are not allowable as pension costs, unless the supplemental benefits represent a separ…
  • FAR 49.603-9 Settlement of reservations.
    [Insert the following in Block 14 of SF 30 for settlement of reservations.] (a) Supplemental Agreement No. ________, dated ________, was executed to reflect the settlement of the termination of this contract. The supplemental agreement exc…
  • FAR 52.103 Identification of provisions and clauses.
    …vision and clause are prescribed in 52.107 (e) and (f). (b) Any provision or clause that supplements the FAR whether it is incorporated by reference or in full text shall be clearly identified by number, title, date, and name of the regula…
  • FAR 52.252-5 Authorized Deviations in Provisions.
    …bed in 52.107(e), insert the following provision in solicitations that include any FAR or supplemental provision with an authorized deviation. Whenever any FAR or supplemental provision is used with an authorized deviation, the contracting …
  • FAR 52.252-6 Authorized Deviations in Clauses.
    …07(f), insert the following clause in solicitations and contracts that include any FAR or supplemental clause with an authorized deviation. Whenever any FAR or supplemental clause is used with an authorized deviation, the contracting office…
  • DFARS 201.304 Agency control and compliance procedures.
    …ir component organizations may issue acquisition regulations as necessary to implement or supplement the FAR or DFARS. (1)(i) Approval of the USD(A&S) is required before including in a department/agency or component supplement, or any othe…
  • DFARS 209.572 Conflicts of interest in certain consulting services.
    …ee the Export Administration Regulations at 15 CFR subchapter C): (A) The Entity List in supplement no. 4 to 15 CFR part 744. (B) The Denied Persons List as described in 15 CFR 764.3(a)(2). (C) The Unverified List in supplement no. 6 to …
  • DFARS 237.7204 Format and clauses for educational service agreements.
    …orders, the Federal Acquisition Regulation, or the Defense Federal Acquisition Regulation Supplement. Changes required to be made by modification to this agreement or by issuance of a superseding agreement. If mutual agreement on the change…
  • DFARS 252.209-7012 Prohibition Relating to Conflicts of Interest in Consulting Services—Certification.
    …ee the Export Administration Regulations at 15 CFR subchapter C): (i) The Entity List in supplement no. 4 to 15 CFR part 744. (ii) The Denied Persons List as described in 15 CFR 764.3(a)(2). (iii) The Unverified List in supplement no. 6 …
  • FAR 4.001 Definitions.
    …nts, the order or agreement number in conjunction with the contract number (see 4.1602). Supplementary procurement instrument identifier means the non-unique identifier for a procurement action that is used in conjunction with the Governme…
  • FAR 15.404-2 Data to support proposal analysis.
    …ble price. The contracting officer shall tailor requests to reflect the minimum essential supplementary information needed to conduct a technical or cost or pricing analysis. (2) The contracting officer shall tailor the type of information…
  • FAR 31.103 Contracts with commercial organizations.
    … on the basis of cost. (a) The cost principles and procedures in subpart 31.2 and agency supplements shall be used in pricing negotiated supply, service, experimental, developmental, and research contracts and contract modifications with c…
  • FAR 31.603 Requirements.
    …such payments in accordance with applicable regulations in the FAR or an executive agency supplement to the FAR. (5) Costs of any membership in any social, dining, or country club or organization. (6) Costs of alcoholic beverages. (7) Co…
  • FAR 32.409-3 Security, supervision, and covenants.
    …ing officer should provide for a paramount lien in favor of the Government. This lien may supplement or replace other security requirements. The lien should cover— (1) Supplies being acquired; (2) Any credit balance in the special account…
  • FAR 32.411 Agreement for special account at a financial institution.
    …_, 20____, the Government and the Contractor entered into Contract No. ____, or a related supplemental agreement, providing for advance payments to the Contractor. A copy of the advance payment terms was furnished to the financial instituti…
  • FAR 32.503-6 Suspension or reduction of payments.
    …ontracting officer shall— (i) In the manner prescribed in paragraph (4) below, prepare a supplementary analysis to be attached to the contractor's request; (ii) Advise the contractor in writing of the differences; and (iii) Adjust all fu…
  • FAR 42.1303 Stop-work orders.
    …issued only if it is advisable to suspend work pending a decision by the Government and a supplemental agreement providing for the suspension is not feasible. Issuance of a stop-work order shall be approved at a level higher than the contra…
  • FAR 52.223-11 Ozone-Depleting Substances and High Global Warming Potential Hydrofluorocarbons.
    …ming potential. The SNAP list of alternatives is found at 40 CFR part 82, subpart G, with supplemental tables of alternatives available at (https://www.epa.gov/snap/). Hydrofluorocarbons means compounds that only contain hydrogen, fluorine…
  • FAR 52.223-12 Maintenance, Service, Repair, or Disposal of Refrigeration Equipment and Air Conditioners.
    …ming potential. The SNAP list of alternatives is found at 40 CFR part 82, subpart G, with supplemental tables of alternatives available at (https://www.epa.gov/snap/). Hydrofluorocarbons means compounds that contain only hydrogen, fluorine…
  • FAR 52.223-20 Aerosols.
    …ming potential. The SNAP list of alternatives is found at 40 CFR part 82, subpart G, with supplemental tables of alternatives available at https://www.epa.gov/snap/). Hydrofluorocarbons means compounds that contain only hydrogen, fluorine,…
  • FAR 52.223-21 Foams.
    …ming potential. The SNAP list of alternatives is found at 40 CFR part 82, subpart G, with supplemental tables of alternatives available at https://www.epa.gov/snap/. Hydrofluorocarbons means compounds that contain only hydrogen, fluorine, …
  • FAR 52.242-3 Penalties for Unallowable Costs.
    …ny cost that is unallowable, as defined in subpart 2.1 of the FAR, or an executive agency supplement to the FAR. (d) If the Contracting Officer determines that a cost submitted by the Contractor in its proposal is expressly unallowable und…
  • FAR 52.242-4 Certification of Final Indirect Costs.
    …n accordance with the cost principles of the Federal Acquisition Regulation (FAR) and its supplements applicable to the contracts to which the final indirect cost rates will apply; and 2. This proposal does not include any costs which are …
  • FAR 52.246-19 Warranty of Systems and Equipment under Performance Specifications or Design Criteria.
    …n in the contract price shall promptly be negotiated by the parties and be reflected in a supplemental agreement to this contract. (7) Any supplies or parts thereof corrected or furnished in replacement and any services reperformed shall a…
  • DFARS 201.301 Policy.
    (a)(1) DoD implementation and supplementation of the FAR is issued in the Defense Federal Acquisition Regulation Supplement (DFARS) under authorization and subject to the authority, direction, and control of the Secretary of Defense. The DF…

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.