NAICS Code for Professional Services
Professional services is the broadest category in federal contracting — covering management consulting, technical consulting, advisory services, and specialized professional work across every federal agency. The NAICS system splits these activities across many codes in the 541xxx range, and picking the wrong one routes you to the wrong competition pool and the wrong contracting officer searches.
Primary NAICS codes for general professional services
541611: Administrative Management and General Management Consulting Services ($24.5M size standard) Use this for general management consulting: organizational design, strategy, operations improvement, change management, executive advisory. Default primary for most management consulting firms.
541618: Other Management Consulting Services ($19.5M size standard) Use this for specialized management consulting not covered by 541611 — logistics advisory, supply chain consulting, specialized operational consulting.
541690: Other Scientific and Technical Consulting Services ($19M size standard) Use this for technical consulting that isn't specific to a dedicated NAICS. GRC, policy development, technical advisory.
541990: All Other Professional, Scientific, and Technical Services ($17M size standard) Catch-all for professional services not fitting elsewhere. Not recommended as primary — if your work fits a more specific NAICS, use it.
Specialized professional services NAICS
541211: Offices of Certified Public Accountants ($22M) — for CPA firms 541214: Payroll Services ($28.5M) 541613: Marketing Consulting Services ($19M) 541810: Advertising Agencies ($25.5M) 541820: Public Relations Agencies ($19M) 541910: Marketing Research and Public Opinion Polling ($25M) 541930: Translation and Interpretation Services ($15M)
If your work fits one of these specialized codes, primary there rather than under 541611 or 541690. Contracting officers search specialized NAICS when they want specialized work.
Which code should be your primary
Answer three questions in order.
Is your work specialized enough to fit a dedicated NAICS? If you're a CPA firm, 541211. If you're an advertising agency, 541810. Specialized NAICS are where contracting officers search for specialized work.
If not specialized, is your work general management or specialized operational? General strategy and operations consulting goes to 541611. Specialized operational consulting (logistics, supply chain, specific industry operations) goes to 541618.
Is your work management or technical? Management consulting is 541611/541618. Technical consulting (scientific, engineering, regulatory) is 541690.
The 541611 vs 541618 split matters. 541611 has higher competition and higher size standard ($24.5M vs $19.5M). 541618 is narrower but less competitive. Most firms should think hard about whether 541618 fits their work — the lower competition often beats the lower size standard.
The 541990 trap
541990 is a catch-all NAICS. Its low size standard ($17M) and generic description make it attractive to firms that can't figure out which 541xxx applies. Don't use it as primary unless your work genuinely doesn't fit elsewhere.
Contracting officers rarely filter searches by 541990 specifically because it's too broad to signal any particular capability. Firms primary under 541990 get less visibility than firms under a specific NAICS that matches their actual work.
Size standard considerations
Professional services size standards range from $14M (HR consulting, 541612) to $28.5M (payroll, 541214). Most cluster around $19-25M, tighter than IT ($34M) or construction ($45M). Professional services firms graduate out of small business status relatively quickly for their revenue size compared to other sectors.
Strategic play: if your work arguably fits both a lower-standard NAICS and a higher-standard NAICS (541611 at $24.5M vs 541990 at $17M, for example), primary under the higher one where legitimate.
Federal demand snapshot
Every federal agency buys professional services. The largest spenders include DoD, DHS, HHS, Treasury, VA, DoJ, and DoE.
Key contract vehicles:
- Professional Services Schedule (PSS) — GSA's primary vehicle for professional services
- OASIS+ — the successor to OASIS, the major multi-award IDIQ for complex professional services
- STARS III — 8(a) multi-award IDIQ heavy with management consulting work
- CIO-SP3 — IT-heavy but includes adjacent technical consulting
SDVOSB, WOSB, 8(a), and HUBZone set-asides all see consistent activity across professional services NAICS. The professional services category is one of the most set-aside-heavy in federal contracting because the work is typically small-firm-friendly and the SBA has explicit goals in several 541xxx codes.
Next steps
Use the NAICS recommender to validate your code selection against your specific professional service mix. For 541611 vs 541618 strategy and primary NAICS selection, see the NAICS code finder guide.