SAM.gov, CAGE Codes, and DFARS: A Plain-Language Guide for Independent STEM Contractors

If you're a STEM professional pursuing work on federal programs — directly or as a subcontractor — three acronyms determine whether you're eligible to work on most of that pipeline: SAM.gov, CAGE, and DFARS. Each one represents a different layer of federal contracting infrastructure, and all three are prerequisites for most government-funded mission work.

SAM.gov — System for Award Management

SAM.gov is the primary database the U.S. federal government uses to manage information about entities that do business with the government. Registration in SAM.gov is required for any organization receiving a federal contract or grant above the micro-purchase threshold ($10,000), and for many subcontracting relationships where the prime contractor has passed down the requirement.

Registration is free. It takes 7–10 business days to process for first-time registrants. You'll need a Unique Entity Identifier (UEI), your business's legal name and address, your NAICS codes (the industry classification codes that describe your business activities), and your banking information for electronic payment setup.

CAGE Code — Commercial and Government Entity Code

A CAGE Code is a five-character ID assigned to entities that do business with the U.S. government. It's assigned automatically when you register in SAM.gov and is used to identify your organization in contracting databases. Foreign entities working with the U.S. government receive a NATO CAGE code (NCAGE) from the NATO Support and Procurement Agency.

Your CAGE code is your identity in the federal contracting ecosystem. It appears on your SAM.gov registration, on every contract and subcontract you receive, and in the ITAR compliance documentation for any defense-adjacent work.

DFARS — Defense Federal Acquisition Regulation Supplement

DFARS is the supplement to the Federal Acquisition Regulation (FAR) that applies specifically to Department of Defense contracts. If you're working on a DoD prime contract or subcontract, DFARS clauses govern everything from cybersecurity requirements (DFARS 252.204-7012, the CMMC predecessor) to specialty metals sourcing (DFARS 252.225-7009) to counterfeit electronic part detection.

The key DFARS provision most STEM contractors encounter: the cybersecurity requirements. DFARS 252.204-7012 requires that DoD contractors who handle Controlled Unclassified Information (CUI) implement NIST SP 800-171 security controls and report cyber incidents to the DoD within 72 hours. This applies to contractors and subcontractors alike.