Professional, Scientific, and Technical Services › Professional, Scientific, and Technical Services › Other Professional, Scientific, and Technical Services
Sector
Professional, Scientific, and Technical Services
Subsector
Professional, Scientific, and Technical Services
Industry Group
Other Professional, Scientific, and Technical Services
National Industry (This Code)
All Other Professional, Scientific, and Technical Services
Source: U.S. Census Bureau 2022 NAICS
Based on SBA Table of Small Business Size Standards (2024)
Size Standard
$19.5M average annual receipts
Measurement Period
3-year average
Standard Type
Revenue-Based
Applies To
All contracts under NAICS 541990
Set-Aside Programs
8(a), WOSB, HUBZone, SDVOSB
Certification Required
No (self-certify in SAM.gov)
Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.
The following activities are classified elsewhere in the NAICS system:
NAICS code 541990 — All Other Professional, Scientific, and Technical Services — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Other Professional, Scientific, and Technical Services space will be able to find your business.
If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of $19.5M average annual receipts, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 541990.
NAICS code 541990 is 'All Other Professional, Scientific, and Technical Services', classified under the Professional, Scientific, and Technical Services sector (NAICS 54). This industry comprises establishments primarily engaged in the provision of professional, scientific, or technical services (except legal services; accounting, tax preparation, bookkeeping, and relat
The SBA defines a small business under NAICS code 541990 (All Other Professional, Scientific, and Technical Services) as one with $19.5M average annual receipts. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.
To register NAICS code 541990 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 541990 (All Other Professional, Scientific, and Technical Services) to your NAICS code list. You may designate one code as your Primary NAICS code.
Other codes in Other Professional, Scientific, and Technical Services
PSC codes commonly used with this NAICS sector
Source: GSA PSC Manual April 2025
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