NAICS 541990

All Other Professional Services — Government Contracts

All Other Professional, Scientific, and Technical Services (NAICS 541990) covers specialized services not classified in other NAICS codes, including energy auditing, security consulting, and forensic services. This broad category appears frequently in federal solicitations.

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States

Top states for NAICS 541990

North Dakota (2)Washington (2)Maine (1)

Active Opportunities

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OFFICE OF NAVAL RESEARCH

SAM

3d left

Garrison Spillway Chute Subdrain Inspection Garrison Dam, ND

W071 ENDIST OMAHA

SAMRiverdale, North Dakota

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Garrison Spillway Chute Subdrain Inspection Garrison Dam, ND

W071 ENDIST OMAHA

SAMRiverdale, North Dakota

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RFQ - Healthcare Building Construction Data and Prices

DOL - CAS DIVISION 5 PROCUREMENT

SAMWashington, District of Columbia

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R--WYOA Woodward Gov Cabinet Assessment

GREAT PLAINS REGIONAL OFFICE

SAM

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Establish a five-year, indefinite delivery, indefi

DOI, NPS CONOPS STRATEGIC

SAM

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R--Science and Technical Support Services (STSSC) For Mid-Continent Region (MCR) i

OFC OF ACQUISITION GRANTS-DENVER

SAM

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Professional Support Services in the Atlantic Area of Responsibility

NAVFACSYSCOM ATLANTIC

SAMKittery, Maine

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The Department of Homeland Security's (DHS) Maritime Capabilities and Innovation - Commercial Solutions Opening Pilot Program (CSOP) General Solicitation

DEPARTMENTAL OPERATIONS ACQUISITION DIVISION I

SAMWashington, District of Columbia

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FY2026 USPS OIG Broad Agency Announcement

SUPPLIES MATERIAL MGMT

SAM

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How to Win NAICS 541990 Contracts

Federal agencies classify solicitations using NAICS codes to identify the type of work or product being procured. NAICS 541990 (All Other Professional Services) must be listed on your SAM.gov registration to appear in searches and receive notifications for matching opportunities.

Each NAICS code has a small business size standard, which determines whether your firm qualifies as "small" for set-aside competitions. Check the SBA's size standards table for NAICS 541990 — the threshold may be based on annual revenue or number of employees.

Many All Other Professional Services contracts are awarded through multi-award indefinite delivery/indefinite quantity (IDIQ) vehicles. Winning a spot on an IDIQ allows you to compete for task orders over 5–10 years, providing a predictable pipeline of work.

Past performance is critical for NAICS 541990 opportunities. Start with smaller contracts (micro-purchases under $10,000 or simplified acquisitions under $250,000) to build your track record, then pursue larger opportunities as your CPARS ratings improve.

Frequently Asked Questions

What is NAICS code 541990?
NAICS 541990 stands for "All Other Professional Services" under the North American Industry Classification System. It is used by federal agencies to classify the type of work being solicited. Businesses must have this code on their SAM.gov registration to be eligible for contracts classified under NAICS 541990.
How do I find NAICS 541990 contracts?
All federal contracts under NAICS 541990 are posted on SAM.gov (formerly FBO.gov). You can search by NAICS code, or use GovMatch to automatically receive daily matches for All Other Professional Services opportunities based on your business profile.
What is the small business size standard for NAICS 541990?
The SBA sets a size standard for each NAICS code that determines small business eligibility. For NAICS 541990, check the current size standards on the SBA website — standards are updated periodically and may be based on average annual receipts or number of employees.
Can I add NAICS 541990 to my SAM.gov registration?
Yes. You can add multiple NAICS codes to your SAM.gov Entity Registration. Adding NAICS 541990 ensures your business appears in agency market research and receives relevant solicitation notifications. There is no limit to the number of NAICS codes you can list.
What certifications help win NAICS 541990 contracts?
Useful certifications vary by industry. Common ones for All Other Professional Services include SBA 8(a) (disadvantaged businesses), HUBZone, SDVOSB, and WOSB. Industry-specific certifications (ISO 9001, CMMI, FedRAMP, etc.) can also strengthen your proposals and differentiate your firm.

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