PEO vs. ASO: What's the Difference and Which One Fits Your Business?
PEO and ASO are often mentioned in the same breath, but the legal structure underneath is completely different - and the difference matters more than it sounds like it should.
What Is a PEO?
A PEO (Professional Employer Organization) enters into a co-employment relationship with your business. Your employees become co-employed by the PEO for administrative purposes. This means the PEO can offer your employees access to its large-group benefits pool, handle payroll taxes under its own EIN, and take on significant compliance liability on your behalf.
What Is an ASO?
An ASO (Administrative Services Organization) provides HR and payroll administration services without the co-employment relationship. Your employees remain solely your employees. The ASO handles the administrative work, but you retain all the employer liability and don't get access to the PEO's large-group benefits pool.
The Core Difference
In a PEO arrangement, you share employer status with the PEO. In an ASO arrangement, you remain the sole employer. This distinction affects benefits access, compliance liability, workers' compensation, and unemployment insurance.
Which Is Right for Your Business?
- Choose a PEO if: You want access to large-group benefits rates, you want to offload compliance liability, and you're comfortable with the co-employment structure.
- Choose an ASO if: You want administrative support but need to maintain sole employer status, or if your benefits are already competitive and you just need HR infrastructure.
A&C Management Group evaluates both options for every client and recommends the structure that delivers the best outcome for your specific situation.