NAICS 541715 covers Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) — and it is the code most government R&D solicitations, including the vast majority of SBIR and STTR awards, are classified under. What makes it unusual is its size standard: unlike most professional-services codes, 541715 is measured by number of employees, not annual receipts, and several defense-related sub-categories carry an even higher employee threshold. If you are an IT or software firm eyeing research dollars, there’s an important catch worth understanding before you chase it — which is exactly why we cross-link it from our NAICS codes for IT contractors guide.
What NAICS 541715 actually covers
Physical R&D — and deliberately not the kinds of work many IT firms do.
541715 is the home of laboratory and other physical research and development in the physical sciences, engineering, and life sciences. It is the code agencies attach to a contract or solicitation when the deliverable is genuine research — a study, a prototype, a new process — as opposed to a service, a product, or a software build.
The SBA’s footnote for this code (and its sibling research codes) draws a hard line around what counts. “Research and development” here means laboratory or other physical research and development. It explicitly does not include economic, educational, engineering, operations, systems, or other nonphysical research — or computer programming, data processing, commercial and/or medical laboratory testing.
Why an IT firm is telling you about a non-IT code. That exclusion of “computer programming” and “data processing” matters enormously. If your work is software development or data services, it likely does not qualify as R&D under 541715 — even when a program markets itself as innovation funding. Pure software firms usually live under 541511 and the other IT codes; 541715 is for physical and engineering research. Always read the solicitation’s stated NAICS and the work’s actual nature together. This is educational, not legal advice — verify against the SBA size standards and the solicitation itself.
One more nuance from the same footnote: for an R&D contract that requires delivery of a manufactured product, the applicable size standard is the one for the relevant manufacturing industry — not 541715. The code follows the substance of the work.
An employee-based standard — and bigger defense exceptions
1,000 employees is the floor. Several defense categories go higher.
Most NAICS codes in the 541xxx professional-services family use a revenue size standard (a dollar ceiling on average annual receipts). 541715 is different: it uses an employee headcount. The base standard is 1,000 employees. On top of that, the SBA defines three exceptions tied to specific defense and aerospace R&D, each with a higher threshold:
| 541715 category | Size standard (employees) |
|---|---|
| Base — R&D in the Physical, Engineering, and Life Sciences (except Nanotech & Biotech) | 1,000 |
| Exception 1 — Aircraft, Aircraft Engine and Engine Parts | 1,500 |
| Exception 2 — Other Aircraft Parts and Auxiliary Equipment | 1,250 |
| Exception 3 — Guided Missiles and Space Vehicles, Their Propulsion Units and Propulsion Parts | 1,300 |
The takeaway: which threshold applies depends on the specific R&D being procured, not just the bare code. A firm doing aircraft-engine R&D under 541715 can be substantially larger and still count as small than one doing general physical-sciences R&D. These figures are current as of the SBA’s published Table of Size Standards — confirm the live numbers against the SBA size standards table and 13 CFR 121.201 before you certify, because the SBA reviews and adjusts standards on a rolling basis.
How headcount is counted. Employee-based standards use your average number of employees over the trailing period defined in SBA regulations, counted across your whole company and its affiliates — full-time, part-time, temporary, and leased people all count. Get the methodology from the SBA, not from a recruiter’s headcount.
Why 541715 anchors SBIR and STTR awards
The research codes are where America’s small-business innovation dollars flow.
If you have heard of SBIR (Small Business Innovation Research) or STTR (Small Business Technology Transfer), 541715 is the NAICS code most closely associated with those awards. Federal agencies set aside a portion of their R&D budgets specifically to fund small-business research, and that research is overwhelmingly classified here.
Feasibility
A short concept phase to test the technical merit or feasibility of an idea, typically lasting roughly six to twelve months. Smaller, fixed funding.
Development
The core R&D effort that expands on Phase I results, generally lasting up to about two years with substantially larger funding.
Commercialization
Moving the innovation toward the market or operational use. SBIR/STTR funds do not pay for Phase III — you bring private or other federal funding.
Two different “small” tests — don’t confuse them. The 1,000-employee figure is the 541715 size standard used for set-asides and small-business competition generally. SBIR/STTR program eligibility is governed by a separate, stricter rule: an awardee, together with its affiliates, must generally have no more than 500 employees. A firm can be “small” under 541715 yet still be too large for an SBIR award. Verify your standing against the program rules at SBIR.gov and 13 CFR 121.702, not just the NAICS table.
For exact, current program parameters — including the SBIR/STTR definition of “research,” award ceilings, and eligibility — see SBIR.gov. Program figures change between policy directives, so treat any dollar amount you read elsewhere as something to confirm at the source.
Putting 541715 to work in your capture strategy
A short, honest checklist before you chase a research solicitation.
- Confirm the work is physical R&D — not software, data processing, engineering services, or testing. If it isn’t, 541715 is the wrong code and a different NAICS (and size standard) governs.
- Identify which size standard applies — base 1,000, or one of the higher aircraft/missile/space exceptions — based on the exact subject of the research.
- Run the SBIR/STTR 500-employee test separately if you are pursuing those programs, counting affiliates.
- Check your SAM.gov registration lists 541715 if you intend to receive these awards, and that your representations are current.
- Map it against the codes you already hold. Many IT firms keep an IT primary (like 541511) and add research codes only when there’s a genuine physical-R&D capability to back them — see our capabilities overview for how we frame that honestly.
None of the above is a substitute for the solicitation. The contracting officer’s stated NAICS code and size standard control a given opportunity — read them, and when eligibility is close, get a definitive read from the SBA before you self-certify.