NAICS Code 561330 — Professional Employer Organizations

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 56133 (Professional Employer Organizations).

Code	561330
Title	Professional Employer Organizations
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$41.5 million in average annual receipts

Official definition (2022 NAICS)

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.

Is a business under 561330 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 561330 qualifies as a small business if it does not exceed $41.5 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 561330 sits in the hierarchy

Level	Code	Title
Sector	56	Administrative and Support and Waste Management and Remediation Services
Subsector	561	Administrative and Support Services
Industry Group	5613	Employment Services
NAICS Industry	56133	Professional Employer Organizations
National Industry	561330	Professional Employer Organizations

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
7363	Help Supply Services

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.