DoD SBIR Phase III: Sole-Source Contracts and Follow-On Funding

What qualifies as DoD SBIR Phase III work

A DoD SBIR Phase III contract can fund additional development, testing, production, or services that build on earlier SBIR-funded work. For a startup with a promising defense application, it provides a potential route from a research award to a funded government customer. The defining requirement is technical lineage: the new work must derive from, extend, or complete work performed under a prior SBIR funding agreement. Phase III uses money from outside the SBIR program’s set-aside funds. The same basic framework applies to STTR follow-on work.

Phase III describes qualifying follow-on activity rather than a standard grant competition with a recurring deadline. A company can move directly from Phase I to Phase III when the technical and customer circumstances support that transition. Phase III also has no SBIR-wide dollar ceiling or prescribed duration, and the small-business size limits associated with Phase I and Phase II do not apply to Phase III awards. The actual scope, value, and schedule depend on the customer’s requirement, available funding, acquisition approach, and assessment of your ability to deliver.

The broader Phase III category includes qualifying commercialization supported by private investment or non-SBIR federal funding. A government Phase III contract is one specific route within that category. Keep those distinctions clear when discussing your pipeline: investor funding, commercial sales, and a signed federal contract represent different commitments and require different evidence.

How the Phase III sole-source pathway works

Federal SBIR policy gives agencies a basis to make qualifying Phase III awards to the company that developed the technology through SBIR. The competition conducted for the original SBIR award generally satisfies the competition requirement for its qualifying Phase III follow-on. That creates a valuable sole-source pathway, subject to the contracting officer’s determination and applicable acquisition requirements. The contracting team still needs to establish the relationship to the earlier work, document its acquisition approach, evaluate price reasonableness, and complete the required award reviews.

Prepare a technical lineage package that makes this determination straightforward. Include the original solicitation topic, Phase I and any Phase II award numbers, statements of work, relevant final reports, and a concise comparison of the earlier research with the proposed follow-on tasks. Explain which algorithms, materials, devices, manufacturing processes, or other capabilities originated in the funded effort. Identify the additional work the customer now needs. A shared technology label offers limited support; a task-by-task explanation helps the contracting officer see exactly how the proposed effort extends the original research.

The follow-on customer can be a different federal organization from the one that funded the original award. For example, an Army customer could potentially procure a qualifying follow-on capability developed through another agency’s SBIR program. The receiving organization must confirm the lineage and complete its own acquisition process. Corporate acquisitions, changes in ownership, and proposed awards to successor entities add questions about the proper award recipient, so involve the contracting officer and qualified counsel early in those situations.

Find a funded customer and an executable requirement

A successful Phase III pursuit brings together three roles: an operational user who needs the capability, a program or budget owner who can support the purchase, and a contracting officer who can execute the award. One person may connect you to all three, but each function needs explicit attention. Ask the user where the technology would operate, what existing system it must interface with, and what measurable improvement would justify adoption. Ask the budget owner which funding source could support the work and when those funds would be available.

DoD Phase III contracts can use appropriate non-SBIR appropriations, including research, development, test, and evaluation funding or procurement funding, depending on the work. Operations and maintenance funding may also be appropriate for certain requirements. The customer’s fiscal and contracting teams determine whether the proposed purpose, timing, and scope fit the available appropriation. A laboratory evaluation, a production purchase, and an ongoing support service can require different funding and contract structures. Shape the statement of work around the customer’s actual acquisition need.

Set the contract value through a defensible scope and estimate. A focused integration or evaluation effort may be substantially smaller than a deployment involving hardware production, cybersecurity, training, and field support. Useful commercial conversations establish a realistic funding range, the expected quantity or period of performance, and the acceptance criteria. Record which commitments are confirmed and which depend on a future budget decision. That distinction helps founders plan staffing and runway around the likelihood and timing of an executable award.

Build a contract-ready scope, price, and compliance package

Develop a statement of work with defined tasks, deliverables, milestones, government dependencies, and acceptance criteria. Specify who supplies test facilities, interfaces, datasets, equipment, and access to government systems. Pair the scope with a price proposal that explains labor categories, estimated hours, subcontractors, materials, travel, indirect costs, and proposed fee or profit as appropriate. The contracting officer will identify the required pricing information and contract structure. Cost-reimbursement arrangements generally bring greater accounting demands, while fixed-price arrangements place more performance-cost risk on the company.

Confirm administrative and security requirements before committing to delivery dates. Maintain an active SAM.gov registration and current representations and certifications, and verify the entity identifiers needed for the award. DoD cybersecurity obligations depend on the contract clauses and the information your systems will handle; requirements can include NIST SP 800-171 implementation, assessment reporting, and applicable Cybersecurity Maturity Model Certification requirements. Export controls, controlled unclassified information, classified access, and testing approvals can affect execution. Map each applicable obligation to an owner, cost, and realistic completion date.

Include a deliberate review of technical data and computer software deliverables. Phase III status has implications for SBIR data-rights protections, and the contract should address the applicable clauses, assertions, and marking requirements. Identify background technology, third-party components, and any customer requests for broader license rights before negotiating the final deliverable list. This review helps align what the government needs to use the capability with the technology rights your company needs for future commercialization.

Turn Phase III interest into a documented acquisition plan

Use a short readiness review before investing heavily in a Phase III proposal. Confirm the qualifying predecessor award, the technical connection, the government requirement, the funding owner, and the contracting office. Then obtain agreement on the next decision: a technical demonstration, a scoped evaluation, a pricing submission, or acquisition planning. Phase III opportunities often develop directly with a customer and contracting office. Follow that office’s submission instructions; the Defense SBIR/STTR Innovation Portal primarily supports the competitive SBIR/STTR process rather than serving as a universal Phase III application portal.

Ask the government team to identify the anticipated award vehicle, required documentation, internal approvals, and target funding window. Check current agency guidance and applicable statutory authority as the acquisition moves forward. Keep hiring and production commitments aligned with signed obligations and contractual direction. GrantUp helps startups assess federal funding fit and prepare clear technical and commercialization narratives that support their funding strategy. To discuss how your existing research and customer needs fit a federal funding pathway, book a free eligibility call with GrantUp.