The short answer
TriNet charges a flat per-employee monthly fee, by quote, that includes EPLI coverage and workers' comp administration, and offers HR Plus, an ASO without co-employment. Paychex quotes HR PEO and also sells HR Partner Plus and HR Pro for HR help without the full PEO.
LeadChange Score: editorial assessment based on public information.
TriNet wins 1Paychex PEO wins 04 ties
| Dimension | TriNet | Paychex PEO |
|---|---|---|
| PricingBoth quote. TriNet bills benefit premiums and payroll taxes on top of its fee; Paychex lists a W-2 fee, a per-delivery payroll fee and a late-injury-report fee. Quote only | Quote only | Quote only |
| IntegrationsTriNet lists 12 integrations, including QuickBooks Online, NetSuite and Greenhouse. Paychex PEO names no integration count on the pages we reviewed. 12 | 12 native | 0 documented |
| SecurityPaychex states SOC 2 Type II and ISO 27001; TriNet holds SOC 2 Type II and states HIPAA compliance. Yes | SOC 2 | SOC 2, ISO 27001 |
| Fit and supportBoth serve small and midsize businesses. TriNet offers advisory or dedicated support on HR Plus; Paychex adds a client advocate at 10+ employees. Small businesses, mid-market companies | Small businesses, mid-market companies | Small businesses, mid-market companies |
| CapabilitiesBoth cover payroll, benefits, workers' comp and HR compliance. TriNet adds performance management and recruiting; Paychex sells those as additional solutions. PEO, HR Plus (ASO), Payroll, Payroll tax, Benefits administration, HR compliance, Time and attendance, Performance management, Recruiting | 9 of 10 core capabilities | 10 of 10 core capabilities |
| Attribute | TriNet | Paychex PEO |
|---|---|---|
| Pricing model | Per employee | Quote only |
| Mobile apps | TriNet mobile app (pay stubs, time off) | Paychex Oasis Employee Connect |
| Support channels | Phone, Online, Advisory support (HR Plus), Dedicated support (HR Plus) | Client advocate (10+ employees), HR business partner, Safety specialist (master workers' comp policy clients), Payroll specialist, Relationship manager (200+ employees) |
| Founded | 1988 | 1971 |
| Headquarters | Dublin, California | Rochester, NY and Cincinnati, OH (dual headquarters) |
| Attribute | TriNet | Paychex PEO |
|---|---|---|
| Price transparency | Quote only | Quote only |
| Best for | Small businesses, mid-market companies | Small businesses, mid-market companies |
| SOC 2 Type II | ||
| Automatic tax filing | ||
| Ownership | Publicly traded | Publicly traded |
Pricing. Both quote. TriNet bills benefit premiums and payroll taxes on top of its fee; Paychex lists a W-2 fee, a per-delivery payroll fee and a late-injury-report fee.
Integrations. TriNet lists 12 integrations, including QuickBooks Online, NetSuite and Greenhouse. Paychex PEO names no integration count on the pages we reviewed.
Security. Paychex states SOC 2 Type II and ISO 27001; TriNet holds SOC 2 Type II and states HIPAA compliance.
Fit and support. Both serve small and midsize businesses. TriNet offers advisory or dedicated support on HR Plus; Paychex adds a client advocate at 10+ employees.
Capabilities. Both cover payroll, benefits, workers' comp and HR compliance. TriNet adds performance management and recruiting; Paychex sells those as additional solutions.
Justworks has the highest LeadChange Score in PEO Services after excluding these two (6.4/10).
From $79/employee/mo (PEO Basic plan)
Neither lists a price: both quote. TriNet’s flat fee includes EPLI and workers' comp administration, while Paychex lists separate fees such as a W-2 fee and a per-delivery payroll fee, so compare the full quote.
Payroll and payroll tax administration, HR expertise, benefits administration, workers' comp administration, and EPLI coverage with claims management. Benefit premiums and the payroll taxes themselves are billed on top.
Yes: TriNet HR Plus is an ASO with an HR platform, priced per employee by service level. Paychex offers HR Partner Plus and HR Pro for HR guidance without the full PEO.
TriNet focuses on healthcare, technology and finance. Paychex PEO names retail among its industry pages.
Paychex assigns an HR business partner and a payroll specialist, adds a client advocate at 10+ employees and a relationship manager at 200+. TriNet supports clients by phone and online, with advisory or dedicated support on HR Plus.
TriNet offers AI-powered tools for routine HR questions and tasks. Paychex PEO lists no AI features on the pages we reviewed.
Both TriNet and Paychex PEO state SOC 2 Type II. Only TriNet states HIPAA (BAA). Only Paychex PEO states ISO 27001.
Your team size, what matters most and your role: see which one fits more of your answers, from verified facts and list prices. Then, if you like, ask to hear from both.
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What the LeadChange Score means
A 0–10 editorial assessment built only from verified facts, across six weighted dimensions: capabilities, pricing, integrations, security, fit and support, and data confidence.
Payments, commissions and lead fees are never inputs.
