DFARS Part 251 Use of Government Sources by Contractors

Part Defense Federal Acquisition Regulation Supplement

Part facts

Citation: DFARS Part 251
Type: Part
Supplements: FAR Part 51 Use of Government Sources by Contractors
Last amended: 86 FR 59869 Effective Oct 29, 2021
Text as of: DFARS Change May 7, 2026
Official text: acquisition.gov

Text from acquisition.gov. Federal Register history from the Federal Register's records of the rules that amended this part.

Subpart 251.1 Contractor Use of Government Supply Sources
- 251.101 Policy
- 251.102 Authorization to use Government supply sources
- 251.107 Contract clause
Subpart 251.2 Contractor Use of Interagency Fleet Management System (IFMS)
- 251.202 Authorization
- 251.205 Contract clause

Federal Register history

Final rule	Published	Effective
Defense Federal Acquisition Regulation Supplement: Technical Amendments 86 FR 59869 · Docket DARS-2021-0001	Oct 29, 2021	Oct 29, 2021
Defense Federal Acquisition Regulation Supplement: Use of Defense Logistics Agency Energy as a Source of Fuel (DFARS Case 2020-D003) 85 FR 53683 · Docket DARS-2020-0029	Aug 31, 2020	Aug 31, 2020
Defense Federal Acquisition Regulation Supplement; Contractor Use of Government Supply Sources 69 FR 67858 · DFARS Case 2003-D045	Nov 22, 2004	Nov 22, 2004
Defense Federal Acquisition Regulation Supplement; Technical Amendments 67 FR 70325	Nov 22, 2002	Not on record
Defense Federal Acquisition Regulation Supplement; Enterprise Software Agreements 67 FR 65509 · DFARS Case 2000-D023	Oct 25, 2002	Not on record
Defense Federal Acquisition Regulation Supplement; Coordinated Acquisition Procedures Update 64 FR 61030 · DFARS Case 99-D022	Nov 9, 1999	Not on record

Quick answers

What is DFARS Part 251?

DFARS Part 251 is a part of the Defense Federal Acquisition Regulation Supplement, titled "Use of Government Sources by Contractors".

When was DFARS Part 251 last changed?

The most recent final rule on record is "Defense Federal Acquisition Regulation Supplement: Technical Amendments" (86 FR 59869), published Oct 29, 2021 and effective Oct 29, 2021.

Are changes to DFARS Part 251 proposed?

No proposed rule from the last 3 years is waiting on a final rule.

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