Founders obsess over Phase I and II because that is where the SBIR money is labeled. But the real value is in Phase III — the follow-on work, funded by ordinary program or procurement dollars, that turns a research project into a fielded capability and a durable revenue line.
Phase III is any work that derives from, extends, or completes an earlier SBIR/STTR effort but is paid for with non-SBIR funds. There is no dollar cap and no separate solicitation. It can be a production contract, a services contract, or a licensing deal. Crucially, it can be awarded at any time — even years after your Phase II ends.
Here is the part that changes how you should think about the whole program. The SBIR statute gives contracting officers authority to award Phase III work sole source — directly to your company, without full and open competition. They do not have to write a separate justification to defend against competition concerns. Congress built that shortcut on purpose to reward the firms that took the early R&D risk.
Sole-source only helps if the customer trusts your technology enough to keep buying. Simulation evidence — validated models that predict performance across the mission envelope — is how you build that trust and defend your data rights markings. Ansys evaluation licensing lets a small team produce that evidence.
See if you qualify for an Ansys eval The MVP playbook →The sole-source authority is not magic; it rests on SBIR data rights. During the protection period — now 20 years from the date of each award — the government cannot disclose your SBIR-developed technical data or software to an outside firm. If it cannot even describe your solution to a competitor, it cannot compete the work away from you. Protect that asset: mark deliverables correctly, keep records that justify your markings, and assert prior data rights when you propose follow-on efforts so the clock extends.
There are limits worth knowing. Phase III cannot be funded with SBIR/STTR set-aside dollars — by definition it uses other money, whether procurement, operations, or a prime's own budget. And the work has to genuinely derive from your prior SBIR effort; you cannot bolt an unrelated scope onto the authority. Within those rules, though, the runway is long: there is no ceiling on the dollar value and no expiration on your eligibility.
Phase III rarely falls in your lap. The companies that win it spend Phase I and II building a relationship with a real end-user and a program office that has money to spend. That is the same customer relationship that powers STRATFI and TACFI matching, and it is why finding your Air Force customer and TPOC early is the highest-leverage thing you can do. Do that, protect your data, and Phase III becomes a door you can open on your own terms — see SBIR.gov's explainer on why it is so valuable.
Official sources: AFWERX — Phase III · SBIR.gov — SBIR/STTR data rights FAQ · SBIR.gov — what makes Phase III valuable. Figures change; confirm on the official page before relying on them.
