Key takeaways
- NAICS 541990 covers professional, scientific and technical services not classified in other codes.
- The SBA size standard is $19.5M in average annual receipts.
NAICS 541990 at a glance
| Fact | 541990 |
|---|---|
| NAICS code | 541990 |
| Title | All Other Professional, Scientific and Technical Services |
| SBA size standard | $19.5M receipts |
| Proposed standard (Aug. 2026) | See proposed rule (not in effect) |
Sources: U.S. Census Bureau NAICS manual; SBA Table of Small Business Size Standards, 13 CFR 121.201. Confirm any size determination with the SBA size tool.
What NAICS 541990 covers
This industry comprises businesses primarily engaged in professional, scientific and technical services not classified in other codes.
Size standard for 541990
A company qualifies as small under NAICS 541990 if its average annual receipts are $19.5M or less, counting affiliates.
In August 2026, the SBA proposed new size standards that may affect this code. The proposal is not in effect. See our SBA size standards guide.
How to win contracts in 541990
- List the code in SAM.gov. Add 541990 to your registration if it describes work you do, and choose a primary code for your main business; see our SAM registration guide.
- Search by code. Filter SAM.gov contract opportunities and agency procurement forecasts by 541990 to find recurring buyers.
- Study past awards. Look at which agencies, contract vehicles and incumbents dominate the code before you pursue it.
- Target the right agencies. Our federal agency guides cover budgets, buying components and forecasts for 23 agencies.
- Look beyond federal. States, cities, counties and school districts buy the same services; see our state government guides.
How KSG helps
Kensington Sales Group's SDRs book meetings with public agencies across Federal, SLED, K-12 & Higher Ed, Healthcare, Tribal, Special Districts and Utilities. We find the program offices and buyers that spend in NAICS 541990 and get you in front of them before solicitations drop. See how our federal sales development works.