The single most common HR-outsourcing decision: PEO (Professional Employer Organization, co-employment) or ASO (Administrative Services Organization, no co-employment). The right answer depends on size, complexity, and whether you want bundled benefits + workers comp or want to keep those direct.
Both arrangements outsource HR administration. The fundamental difference: PEOs enter co-employment and bundle insurance components into a per-employee-per-month fee; ASOs administer HR without co-employment and leave benefits + workers comp under the client's direct control.
| PEO | ASO | |
|---|---|---|
| Legal employer of record | PEO assumes co-employer status for tax and benefits purposes | Client remains sole employer of record |
| Workers comp | PEO pool placement — master policy covers all client workforces | Client purchases WC directly from a carrier |
| Group benefits | PEO master plan — small employers access large-group pricing | Client purchases via broker — pricing per client's own group |
| Federal tax liability | CPEOs assume sole liability under SBEA | Client retains full liability |
| Pricing model | $200–$400 PEPM all-in (admin + comp + benefits + tech) | $50–$150 PEPM for admin only; benefits + comp priced separately |
| Best fit | 10–150 W-2 employees, want bundled simplicity | 100+ employees, want control over carrier selection |
| Multi-state offload | Built in — PEO is registered in every state | Client retains state-by-state registration burden |
PEO wins when: you have 10–100 W-2 employees, you want benefits pool pricing without standalone-group complexity, you operate in 3+ states, your workers comp is a meaningful line item, or you want maximum compliance offload.
ASO wins when: you have 150+ employees, you have specific benefits carrier relationships you want to keep, you have unique workers comp arrangements that don't fit PEO pool placement, or you want to retain control over plan design.
For most small-and-mid-sized businesses (10–150 employees), PEO is the better starting point. ASO becomes more attractive as you grow and want direct control over benefits and carriers — many businesses transition from PEO to ASO around 100–200 employees.
PEO wins when: you have 10–100 W-2 employees, you want benefits pool pricing without standalone-group complexity, you operate in 3+ states, your workers comp is a meaningful line item, or you want maximum compliance offload.
ASO wins when: you have 150+ employees, you have specific benefits carrier relationships you want to keep, you have unique workers comp arrangements that don't fit PEO pool placement, or you want to retain control over plan design.
For most small-and-mid-sized businesses (10–150 employees), PEO is the better starting point. ASO becomes more attractive as you grow and want direct control over benefits and carriers — many businesses transition from PEO to ASO around 100–200 employees.
All PEO comparison guides — every alternative we cover side-by-side.
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