Two identifiers follow a small business through every federal system it touches: a Unique Entity Identifier and, often, a CAGE code. Neither costs anything, both are issued as part of registering your entity with the government, and the only real trap is assuming you can generate them on submission day.
The Unique Entity Identifier
The UEI is a twelve-character alphanumeric code assigned to your entity when you register in the government's central entity system. It replaced an older nine-digit identifier issued by a commercial provider, and the changeover is complete — if an old proposal template still asks for the previous number, the template is out of date.
The UEI is the key that ties your company together across systems. Application portals validate it, agency systems index awards under it, subaward reporting references it, and the application itself asks for it on the cover forms. It is assigned to the legal entity, not to a location or a project, and it does not change when you move offices. It does change if you form a genuinely different legal entity, which is worth thinking about before a restructuring.
The CAGE code
A CAGE code — Commercial and Government Entity code — is a five-character identifier assigned by the Defense Logistics Agency to organizations doing business with the federal government. For US entities it is normally assigned automatically as part of completing entity registration; you do not apply for it separately. Entities located outside the United States obtain an NCAGE code through a different route before registering.
You will certainly need one if you pursue contracts, which several defense components use for SBIR rather than grants, and it appears throughout defense procurement and property systems. Grant-only applicants sometimes never think about it, but agency forms and portals may still request it, so know where to find yours. If federal contracting is part of the plan, the broader picture is in selling a product to the government.
Keeping the identifiers consistent
Most identifier problems are not really identifier problems. They are name and address mismatches. Every downstream system checks what you type against what your entity registration says, so the legal name in your application, your eRA or agency portal profile, and the SBIR company registry must all match the registration character for character. "Acme Robotics, Inc." and "Acme Robotics Inc" are different strings to a validator.
Three habits prevent nearly all of it. Copy the legal name from your registration record rather than typing it. Keep one document listing your UEI, CAGE code, EIN, and legal name, accessible to whoever prepares proposals. And confirm your registration is still active before every submission, because the identifiers are useless if the underlying registration has lapsed. Which agency you are registering to face is a separate decision, covered in choosing between NIH, NSF, DoD and DOE, and the rest of the program mechanics sit in the SBIR and STTR section.
Projects House works with founders on the engineering side of an SBIR while the registrations run in parallel. Reach us through the contact form.