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.
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
| NAICS Code | 561330 |
|---|---|
| Industry Title | Professional Employer Organizations |
| SBA Size Standard | $41,500,000 |
| U.S. Establishments | 4,343 (Census CBP, 2023) |
| IRS PBA Code | 561300 (rolled-up match) |
| Sectors Hierarchy | Sector 56 → 561 → 5613 |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
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)
Related Resources & Compliance Guides
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.
- 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.
Related Industries in 5613
Frequently Asked Questions (FAQ)
Is 561330 a valid 2022 NAICS code?
NAICS 561330 is 'Professional Employer Organizations', a 2022 U.S. national industry under Sector 56 (Administrative and Support and Waste Management and Remediation Services); the SBA small-business size standard is $41,500,000.
What is the SBA size standard for NAICS 561330?
The SBA small business size standard for NAICS 561330 is $41,500,000 (based on receipts).
What is the legacy SIC code mapping for 561330?
NAICS code 561330 maps to the legacy 1987 SIC codes: 7363 - Help Supply Services.