ADP TotalSource vs Oasis PEO
How the two PEOs compare on pricing, minimum employees and fit.
| ADP TotalSource | Oasis PEO | |
|---|---|---|
| Company size | About 67,000 employees (ADP, 2025) | Being confirmed |
| Headquarters | Roseland, NJ | West Palm Beach, FL |
| Founded | 1949 | Being confirmed |
| Pricing | No published PEO pricing. Quote required. | Quote-based. Applicant tracking and performance management cost extra. |
| Pricing model | Quote only | Quote only |
| Best for | Established mid-market companies | Growing small and mid-sized businesses with fewer than 49 employees (Oasis Outsourcing, now part of Paychex) |
| IRS certified (CPEO) | Yes, on the IRS list | Yes, on the IRS list |
| ESAC accreditation | Not confirmed | Accredited |
| Minimum employees | 5 employees | 5 employees |
Carriers, 401(k) and workers' comp: side by side
| ADP TotalSource | Oasis PEO | |
|---|---|---|
| Health carriers | Multiple carrier choices; carriers not named ADP comparison page · Provider site | Not publicly listed yet. We will get this for you: request a quote and we will include it. |
| 401(k) provider | ADP TotalSource Retirement Savings Plan, a multiple employer 401(k) with 23 funds, 6,500+ adopting employers, 348,000 participants and $9B+ in assets (Sept 30, 2024); total cost 0.26% to 1.01%. Materials are branded Voya, which suggests Voya as recordkeeper (inferred, not stated) Voya/ADP cost brochure · Provider site · Sept 30, 2024 | 401(k) and a Pooled Employer Plan (PEP) offered; provider not named Crazy Egg review · Third-party review |
| Workers' comp | Workers' comp insurance with claims support, safety support and 24/7 nurse triage; carrier not named ADP comparison page · Provider site | Workers' compensation plans offered through Paychex Insurance Agency; carrier not named Crazy Egg review · Third-party review |
| Other named partners | Not publicly listed yet. We will get this for you: request a quote and we will include it. | Not publicly listed yet. We will get this for you: request a quote and we will include it. |
Due diligence checked November 4, 2026. We only list carriers and partners that a filing, the provider or a named review states. Many PEOs do not publish their carriers or recordkeepers, so "not publicly listed" means we could not find it, not that none exists. If something is missing, request a quote and we will get it from the PEO for you. Lineups vary by state and change at renewal. Source types: SEC filing (strongest), provider site, third-party review.
Questions to ask before you sign
- Which medical carriers and networks are available in my state and zip code?
- Are the health plans fully insured or partially self-funded, and who bears claims risk?
- Who is the 401(k) recordkeeper, and what are the total plan fees and match options?
- Who is the workers' comp carrier, how are rates set, and what happens to my experience rating if I leave?
- Is the entity that will employ my staff on the IRS CPEO list, and is it ESAC accredited?
- What renewal increase did your plans see in each of the last 3 years?
Choose ADP TotalSource if
Established mid-market companies.
- Large scale with more than half a million worksite employees reported
- Broad HR, payroll and benefits administration
Choose Oasis PEO if
Growing small and mid-sized businesses with fewer than 49 employees (Oasis Outsourcing, now part of Paychex).
- Assigned payroll account manager and HR professional with 24-hour HR phone support
- IRS and ESAC accredited
- Workers' comp, cyber liability and employment practices liability coverage options
Ask ADP TotalSource about
- Pricing is not published
- Cost structure is reported as better suited to larger teams
Ask Oasis PEO about
- One-year minimum contract with 30 days' written notice to cancel, and an early termination fee may apply
- Interface described as dated
- Sources disagree on the minimum: one says five employees, another says none
Frequently asked questions
Is ADP TotalSource or Oasis PEO cheaper?
ADP TotalSource: No published PEO pricing. Quote required. Oasis PEO: Quote-based. Applicant tracking and performance management cost extra. Published rates are not directly comparable to quote-only pricing, and health premiums are separate.
Which is better for a small company, ADP TotalSource or Oasis PEO?
ADP TotalSource is best for established mid-market companies. Oasis PEO is best for growing small and mid-sized businesses with fewer than 49 employees (oasis outsourcing, now part of paychex).
Last verified November 4, 2026. Based on third-party reviews and vendor pricing pages. See each provider page for sources.