All Other Professional, Scientific, and Technical Services (NAICS 541990) is a catch-all category for professional and technical services not classified elsewhere. This is typically a secondary code for companies whose primary services fall into other NAICS categories.
What Businesses Fall Under This Code
541990 includes specialized professional services, technical services, and professional consulting that don't fit other classifications. This is the "other" category—if your services don't clearly fit other codes, 541990 may apply.
SBA Size Standard and What It Means
Size standards for 541990 vary based on specific service category. Generally, the SBA size standard is $8.5 million in annual revenue, though specific subtypes may differ. Check SAM.gov size standards for your specific service area.
Federal Spending in This Category
Federal spending in miscellaneous professional services is significant, though specific amounts vary. This category captures specialized services across government.
Top Agencies Buying in This Code
All federal agencies procure specialized professional services. This spending is distributed across agencies based on mission-specific needs.
Tips for Tech Companies Using This Code
Use 541990 as a secondary code if your specialized services don't clearly fit other codes. This should rarely be your primary NAICS code—if you can classify your services more specifically (development, engineering, consulting), do so. But if you offer truly unique technical services, 541990 may be necessary.
Pro Tip: Avoid 541990 as your primary code if possible. Federal procurement officers search by specific NAICS codes. Being categorized as "other services" makes you less visible than companies in specific technical categories. Use more specific codes when available.
Register Under NAICS 541990
Classify your business correctly to maximize visibility to federal buyers and access small business set-asides.
Start Your SAM.gov Registration →