Phase III is the part of the SBIR program founders most often misunderstand, usually because the name suggests a third round of grant money. It is not. There is no SBIR set-aside funding for Phase III. Phase III is work that derives from an earlier Phase I or Phase II effort, paid for out of ordinary agency budgets or private money, and what makes it valuable is the contracting authority attached to it.
What Phase III actually is
Under the SBIR Policy Directive, work that derives from, extends, or completes an earlier SBIR or STTR effort can be awarded as a Phase III. Any federal agency can make such an award, not only the one that funded your earlier phases. There is no statutory dollar limit and no fixed duration. It can be a production contract, a services contract, further research and development, or a sale to a prime contractor buying on the government's behalf. The company keeps the SBIR data rights protections that attached to the earlier work, which is one of the strongest positions a small firm can hold with a federal customer.
The sole-source authority
The valuable part is that a Phase III can be awarded without further competition. Federal procurement normally demands full and open competition; the SBIR authority is a recognized exception, on the reasoning that the government already competed the technology when it selected your Phase I. Contracting officers still have to document the basis, and they will ask you to show the derivation from the earlier award — which is why clean records of your Phase I and Phase II scope, deliverables and reports matter long after closeout. Our guidance on reporting and deliverables is worth revisiting with that in mind.
How companies fail to use it
The common failures are avoidable. Companies finish a Phase II and wait for someone to call. They apply data rights markings inconsistently, weakening their position later. They cannot articulate in one page how a proposed contract derives from the funded work — the exact document a contracting officer needs to justify the award. And they assume the customer knows the authority exists, when many contracting shops encounter it rarely and need to be pointed to it politely.
What works instead is building the transition case while the Phase II is still running: identify an office with a budget and a requirement, keep your data rights clean (see who owns the IP from a federal grant), and learn the mechanics of federal buying, covered in selling to the government. A prime contractor can also be the Phase III customer when it is procuring for a federal program.
Phase III eligibility and how a specific contract must be structured are legal questions. Confirm the details with a government contracts attorney and with the contracting officer; treat this as general background rather than advice.
Projects House helps small firms mature Phase II technology into something a program office can actually buy. Reach us through the contact form.