UEI is a 12-character identifier assigned by the U.S. government through SAM.gov to uniquely identify businesses across federal systems. Established as part of federal data modernization efforts, the UEI replaced the older DUNS Number system as the government's primary business identifier. All federal contractors, grantees, and vendors must have a valid UEI. The identifier appears on contracts, grants, invoices, and all federal transactions. UEI is managed by the General Services Administration (GSA) through SAM.gov and is distinct from but linked to the CAGE Code used specifically for contracting.
Opening Definition
A UEI is a 12-character government identifier assigned through SAM.gov to uniquely identify businesses across federal systems. Required for all federal contracts, grants, and transactions; replaces legacy DUNS Numbers.
Why It Matters for Tech Companies
Without a UEI, you cannot receive federal contracts, grants, or payments. It's the government's primary business identifier across all systems. Your UEI links to your SAM.gov registration, payment accounts, and federal grant eligibility. Protecting your UEI is critical—if compromised or suspended, federal opportunities are blocked. For tech companies entering federal contracting, registering for a UEI is the first step. Registration is free through SAM.gov and takes 2-5 business days. Once obtained, your UEI remains with your company permanently.
How It Works in Practice
Step 1: Verify Business Registration (Month 1) Have your EIN, registered business name, and principal address ready. Step 2: Register with SAM.gov (Month 1) Create SAM.gov account. Provide business information, points of contact, and banking details for federal payments. Step 3: Receive UEI Assignment (Days 1-5) SAM.gov automatically assigns UEI upon account activation. Step 4: Maintain UEI (Ongoing) Keep SAM.gov account active and current. SAM.gov requires annual renewal (December 31 deadline). Example: Cloud software startup incorporating in Colorado. Register with SAM.gov using EIN and company information. Within 2 days, receive UEI 123ABC456DEF. Use on all federal proposals, contracts, invoices, and grant applications.
Common Mistakes to Avoid
- Not renewing SAM.gov annually: SAM.gov registration must be renewed every December 31.
- Using outdated information: If address, ownership, or banking changes, federal payments might fail or contracts rejected.
- Confusing UEI with CAGE Code: Different identifiers serving different purposes.
- Not protecting UEI: Don't share UEI loosely.
- Assuming transfer with business changes: Verify requirements during major business transitions.
Key Facts and Numbers
- 12-character alphanumeric identifier
- Assigned by GSA through SAM.gov
- Free to register and maintain
- Replaces legacy DUNS Numbers (transition completed 2022)
- Requires annual SAM.gov renewal (December 31 deadline)
- Permanent identifier linked to company's federal history
- Used across all federal systems
Related Terms
CAGE Code • SAM.gov • NAICS Code
Related Guides
Complete SAM.gov Registration Guide • Federal Contractor Setup Checklist
Frequently Asked Questions
Do I need both UEI and CAGE Code?
Yes. UEI is the primary federal identifier across all systems. CAGE Code is specific to contracting. Your SAM.gov account has both.
What happens if I don't renew SAM.gov?
Your UEI becomes inactive. You lose federal contracting eligibility and can't receive federal payments.
Can I have multiple UEIs?
No. One business entity gets one UEI. If you have multiple legal entities, each gets its own UEI.
How long does UEI registration take?
2-5 business days typically. UEI appears immediately in your SAM.gov account once assigned.