541990: All Other Professional, Scientific and Technical Services
Professional, scientific and technical services with no code of their own are collected here, which makes it one of the broadest codes in the federal record.
NAICS 541990 in numbers
Everything behind these numbers for NAICS 541990
- Every buying office that awarded in this code, ranked by what they spent
- Every vendor that won, resolved to one record per business
- Every award back to FY2001, searchable and exportable
- Contracts ending soon, scored for how open the next round looks
- Every open notice on this code, with the buyer history beside it
The numbers above are open to anybody. The organized record behind them is what a plan pays for: every award, every buyer, every vendor, cleaned, resolved and read again every night.
Open right now under NAICS 541990
134 open notices right now, 23 closing within seven days. The newest 5:
| Posted | Notice | Buyer | NAICS | Set-aside | Due |
|---|---|---|---|---|---|
| Oct 28, 2026 | SAF/CDM Commercial Solutions Opening and Specific CallsSolicitation | FA7146 SAF OC PK | 541990 | Oct 1, 2027 | |
| Oct 28, 2026 | 711th HPW Mission Support Services MAC IDIQCombined Synopsis/Solicitation · Wright Patterson AFB OH | FA2396 USAF AFMC AFRL PZL AFRL PZLE | 541990 | 8A | Nov 3, 2026 |
| Oct 28, 2026 | SMART IRB Governance, Administration, and Operations Support (GAOS)Combined Synopsis/Solicitation · MD | NATIONAL INSTITUTES OF HEALTH NIDA | 541990 | Nov 13, 2026 | |
| Oct 28, 2026 | NASA NIOC Engineering ServicesSpecial Notice | NASA SHARED SERVICES CENTER | 541990 | Nov 2, 2026 | |
| Oct 28, 2026 | Artifact Conservation Project CoordinatorSolicitation · College Park MD | NARA CONTRACTING OFFICE | 541990 | SBA | Nov 12, 2026 |
What this code covers
541990 is the residual for the whole professional, scientific and technical services sector. Anything that is a professional or technical service and has no more specific code lands in it: appraisals, translation and interpretation arranged as a service, weather forecasting services, patent brokering and a long tail of others.
In federal contracting it is also used as a catch-all by buying offices who cannot place a requirement, which means the work under it is unusually varied and the code on its own tells a bidder almost nothing. Read the statement of work.
What federal buyers typically ask for
The requirements follow whatever the work is, but the professional services pattern holds: labor categories, key personnel, past performance and a rate based price. The Service Contract Act is the thing to check early. It turns on whether the principal purpose of the contract is furnishing services in the United States through service employees, not on where the work happens, so a contract performed entirely at your own site can still carry a wage determination setting minimum rates and fringe benefits by labor category and locality. Bona fide professional employees are exempt, which is why two contracts that look alike can be treated differently.
Because the code is a residual, it is a useful place to find work that better-organized competitors have filtered out of their own market picture. It is also a place where a requirement that should have been coded elsewhere appears, so a firm in a named speciality should watch this code alongside its own.
Product and service codes that often pair with this NAICS
| Code | What it is | Why it matters |
|---|---|---|
| R499 | Other professional support services | The residual professional class, and the usual one here. |
| R425 | Engineering and technical services | Technical work read as engineering. |
| R408 | Program management and support services | Program support with a professional component. |
| B599 | Other special studies and analysis | One-off studies. |
| R405 | Operations research and quantitative analysis | Analytical work with a modelling component. |
A residual NAICS code paired with a residual product and service code means the buying office has not classified the work at all. Those notices are worth reading rather than filtering out.
Before you bid
Check whether a Service Contract Act wage determination is attached, and do not assume it away because the work is done at your own office. Coverage turns on the principal purpose of the contract rather than on the place of performance, and a determination sets minimum wages and fringe benefits by labor category and locality that have to be in the price rather than absorbed.
Related reading
- One marketEvery source at once, which is how a residual code is best read.
- Saved viewsKeep this code beside your own.
- Choosing NAICS codesWhich codes to register under, and why.
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