561330 — Professional Employer Organizations
Description
This industry comprises establishments primarily engaged in providing human resources and human resource management services to client businesses and households. Establishments in this industry operate in a co-employment relationship with client businesses or organizations and are specialized in performing a wide range of human resource and personnel management duties, such as payroll, payroll tax, benefits administration, workers' compensation, unemployment, and human resource administration. Professional employer organizations (PEOs) are responsible for payroll, including withholding and remitting employment-related taxes, for some or all of the employees of their clients, and also serve as the employer of those employees for benefits and related purposes (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Supplying their own employees for limited periods of time to supplement the working force of a client's
- business--are classified in Industry 561320, Temporary Help Services; and
- Listing employment vacancies and referring or placing applicants for employment--are classified in U.S.
- Industry 561311, Employment Placement Agencies.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 7363 - Help Supply Services (via SIC1987:7363→NAICS1997:56133→2002:561330→2007:561330→2012:561330→2017:561330→2022:561330)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC R499 — Other Professional Services
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 561330 valid in 2022? ▾
Yes, 561330 is a valid 6-digit 2022 NAICS national industry code representing 'Professional Employer Organizations' under Sector 56 in the official classification index.
What is the SBA size standard for NAICS code 561330? ▾
The Small Business Administration (SBA) has established a small business size standard of $41,500,000 for NAICS code 561330 (Professional Employer Organizations), calculated based on receipts.
What is the legacy SIC equivalent for NAICS 561330? ▾
According to official Census Bureau concordance tables, NAICS code 561330 (Professional Employer Organizations) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 7363 - Help Supply Services.
Related Pages & Tools
Further regulatory reference links for NAICS code 561330:
- Sector 56 Directory Hub — List of related industries in the Administrative and Support and Waste Management and Remediation Services sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 561330 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Professional Employer Organizations).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.