The Data Universal Numbering System, known as DUNS, was used for decades as the standard method for identifying businesses and organizations that participated in federal contracting. Managed by Dun & Bradstreet, the DUNS number served as a unique nine-digit identifier that allowed the U.S. government to track entities across procurement systems. However, in 2022, the General Services Administration implemented a major transition away from the DUNS system to a new standard known as the Unique Entity Identifier, or UEI.
The transition from DUNS to UEI represented a significant modernization effort in federal procurement. It streamlined registration and identification processes in the System for Award Management (SAM.gov), improved data transparency, and gave the federal government full control over entity management data for the first time. This change affected every organization that does business with the federal government, including GSA Schedule contractors, grant recipients, and subcontractors.
Background of the DUNS System
For many years, the DUNS number was a fundamental requirement for federal contracting. Each business or organization that wished to do business with the government was required to obtain a DUNS number from Dun & Bradstreet. This unique identifier linked company information such as legal name, physical address, and financial data.
While the system provided consistency, it also had limitations. Because Dun & Bradstreet was a private company, it controlled the issuance and maintenance of DUNS numbers. Contractors had to manage their information through an external database separate from SAM.gov. This often created administrative delays and data inconsistencies between commercial and government systems.
As federal procurement technology evolved, it became clear that a government-owned and managed entity identification system would offer greater efficiency and transparency. The shift to the Unique Entity Identifier was the result of this modernization effort.
The Transition to the Unique Entity Identifier
The General Services Administration officially completed the transition from DUNS to UEI on April 4, 2022. From that date forward, the federal government stopped using DUNS numbers for entity identification and replaced them with the new UEI, which is generated directly within SAM.gov.
Under the new system, all registered entities automatically received a UEI without having to take any action. For businesses that were not yet registered, the process of obtaining a UEI became integrated into the SAM.gov registration workflow.
This transition simplified the overall registration process and eliminated the need for third-party coordination. The new system allows entities to manage all identification, registration, and renewal activities within one centralized platform.
Reasons Behind the Transition
Several key factors motivated the move from DUNS to UEI:
- The need for government ownership of entity identification data rather than relying on a private company.
- The desire to eliminate barriers and delays caused by the requirement to interact with an external provider.
- The goal of improving data accuracy and consistency across federal procurement and grant systems.
- The effort to modernize SAM.gov and consolidate multiple legacy systems into one integrated environment.
- The commitment to making the registration process more user-friendly and accessible for small businesses.
These changes aligned with the broader federal initiative to streamline acquisition processes and improve transparency in government data management.
How the UEI System Works
The Unique Entity Identifier is a 12-character alphanumeric code assigned automatically by SAM.gov when an organization registers or renews its registration. Unlike the DUNS number, which was issued by an outside vendor, the UEI is generated by the government’s own database.
Each UEI is permanent and tied to a specific legal entity. It does not expire, even if the entity’s registration in SAM.gov lapses. The identifier is used across all federal award systems, ensuring that each organization is recognized consistently across government platforms.
For contractors and grant recipients, the UEI now serves as the primary identification number used for:
- Federal contract awards.
- GSA Schedule registrations.
- Grant applications and payments.
- Reporting through systems like FPDS, USASpending.gov, and SAM.gov.
- Electronic invoicing and financial tracking.
By integrating all these functions under one identifier, the government has reduced duplication and simplified data validation across agencies.
Impact on Federal Contractors and GSA Schedule Holders
The DUNS to UEI transition significantly impacted GSA Schedule contractors and other federal vendors. Every business registered in SAM.gov automatically received a new UEI, which replaced the DUNS number across all government systems.
For most contractors, the transition required minimal action. GSA automatically updated UEI data in eMod, eOffer, and GSA Advantage systems. However, contractors were encouraged to verify that their entity information matched across all platforms and that internal documentation, invoices, and marketing materials reflected the new identifier.
Contractors also had to update any internal systems, templates, or databases that previously relied on DUNS numbers for reporting or compliance tracking. Failure to do so could result in processing delays for invoices or contract modifications.
Benefits of the DUNS to UEI Transition
The introduction of the Unique Entity Identifier provided several important advantages over the previous DUNS-based system. These include:
- Government Ownership: The UEI system is fully owned and managed by the U.S. government, eliminating dependency on an external company.
- Integrated Process: Contractors no longer need to visit an external website to obtain or manage their entity number. The entire process occurs within SAM.gov.
- Improved Data Accuracy: Centralized data reduces errors and inconsistencies between different procurement platforms.
- Simplified Registration: The UEI is automatically assigned during registration, making it easier for new businesses to enter the federal marketplace.
- Enhanced Transparency: Agencies and the public can more easily track federal spending and contractor activity using consistent identification records.
Overall, the transition represents a modernization of federal procurement data management and a major step toward improving efficiency across government systems.
Challenges During the Transition
While the transition was largely successful, it was not without challenges. Some entities experienced delays in system updates or confusion over how to locate their new UEI. Because the DUNS system had been in place for decades, many contractors relied on it for internal reporting, invoicing, and compliance documentation.
The most common issues included:
- Misalignment of data between legacy systems and SAM.gov.
- Outdated vendor records in subcontracting or third-party systems that still referenced DUNS numbers.
- Technical delays in integrating UEI identifiers with financial management systems.
- Confusion among subcontractors and partners about the new process for entity verification.
To resolve these challenges, the GSA provided extensive outreach, training materials, and online tools to help users locate their UEI and confirm registration accuracy.
How to Locate and Verify a UEI
Contractors can easily find their Unique Entity Identifier by logging into SAM.gov. Once logged in, the UEI is displayed on the entity’s registration record and can be viewed or copied for use in contract documents, invoices, and proposals.
For entities that are not yet registered, the process of obtaining a UEI begins automatically during the SAM.gov registration. There is no cost to receive a UEI, and no separate registration with Dun & Bradstreet is required.
To verify a UEI, users can use the public search feature in SAM.gov to confirm that the entity’s information is active and current. Regular verification is recommended to prevent delays in contract renewals or payments.
The Role of UEI in Compliance and Reporting
The UEI is now a key component of compliance, reporting, and audit activities. Federal systems such as the Federal Procurement Data System and USASpending.gov use UEI data to track contract awards, spending patterns, and vendor performance.
For GSA contractors, maintaining an active and accurate SAM.gov registration with a valid UEI is mandatory. Inactive or incorrect records can result in delays in contract modifications, renewals, or payments. Agencies also rely on UEI data to verify eligibility for socioeconomic programs such as HUBZone, WOSB, and SDVOSB certifications.
The shift to the UEI system supports greater integration across all federal award systems, reducing the risk of discrepancies and improving overall accountability.
Best Practices for Contractors After the Transition
Contractors should take several proactive steps to ensure full compliance and efficiency under the new UEI system:
- Review and update all internal documents, invoices, and forms to include the UEI instead of the DUNS number.
- Verify that all federal systems, including GSA eBuy, eOffer, and eMod, display the correct identifier.
- Communicate the change to subcontractors, business partners, and financial institutions.
- Maintain accurate contact and banking information in SAM.gov to prevent registration delays.
- Schedule regular reviews of SAM.gov registration to ensure continued compliance and avoid lapses.
Following these best practices ensures that contractors remain fully aligned with GSA and federal procurement requirements.
The Broader Significance of the Transition
Beyond administrative changes, the DUNS to UEI transition symbolizes a major shift toward modernization in federal acquisition. It supports the government’s long-term goal of creating an integrated, transparent, and data-driven procurement ecosystem.
By consolidating entity management under SAM.gov, the government now has greater control over data accuracy, security, and accessibility. This enables agencies to make more informed decisions, identify potential risks faster, and improve public visibility into federal spending.
The transition also reinforces the government’s commitment to lowering barriers to entry for small businesses. The simplified registration process makes it easier for new vendors to participate in federal contracting, supporting diversity and competition in the marketplace.
Conclusion
The transition from the Data Universal Numbering System to the Unique Entity Identifier marked a historic modernization in federal contracting and grant management. It replaced a private, vendor-controlled identification process with a government-managed, centralized, and user-friendly system.
For GSA contractors and other federal vendors, adapting to the UEI system ensures continued compliance and smooth participation in government programs. The new identifier enhances efficiency, transparency, and accountability across all levels of the federal acquisition process.
While the DUNS number played a vital role for many years, the introduction of the UEI represents a more streamlined and secure future for government contracting. Contractors that embrace this transition and maintain accurate records will continue to thrive in the modernized federal procurement environment.
