Insperity vs. ADP TotalSource
Both are IRS-certified PEOs built on co-employment, and neither publishes pricing. The real split is service model versus technology ecosystem: Insperity is built around dedicated regional HR service teams, while TotalSource sits inside the wider ADP platform stack. If you already run ADP payroll, consolidating argues for TotalSource; if you want a named HR team that knows your account, that argues for Insperity.
Insperity
- IRS-certified PEO (CPEO); also ESAC-accredited — verify current status on the IRS CPEO registry, since certification covers federal employment tax responsibility and does not grade service quality
- Positioning is built on service intensity: dedicated HR teams and regional offices rather than a portal plus a phone tree
- Co-employment model — Insperity becomes employer of record for tax purposes and your staff move to Insperity-sponsored benefits plans
- Heaviest client concentration reported in the 50–200 employee range, with presence above and below it
- Published figure from Insperity's own testimony to the Maryland legislature (2026): more than 304,000 worksite employees across 46,000 small and mid-sized clients
- Custom quote only — no published per-employee or percentage-of-payroll rate
- Platform exists to serve the PEO relationship rather than as a standalone product line
ADP TotalSource
- ADP describes TotalSource as among the largest IRS-certified PEOs; verify certification and scale figures against ADP's own disclosures
- Structural advantage is the ecosystem: payroll technology, HR tooling, and reporting come from the same vendor that already runs payroll for a large share of US businesses
- Co-employment model — ADP becomes employer of record for tax and benefits purposes under the service agreement
- ADP's own comparison pages cite benefits it includes that Insperity does not, including a Legal Defense Benefit and benchmarking drawn from its broader US client base. Those claims come from ADP, a competing vendor — treat them as marketing and verify in the proposal
- Catalog range spans small and midsize employers upward; frequently considered by companies past the mid-market band
- Custom quote only — no published pricing basis; ADP's proposal process requires census, benefits selections, and workers' compensation data
- ADP states it integrates with hundreds of third-party applications through ADP Marketplace
How should you make the decision?
Start with the work your company needs performed, the decisions that require internal ownership, the amount of day-to-day capacity required, and the risks of changing models. Then ask providers to map their scope against that operating picture.
A model is not a quality guarantee. Service teams, implementation, systems, pricing, and contract terms differ materially within every category.
Sources and caveats
Neither provider publishes PEO pricing, so there is no honest head-to-head price figure. Third-party trackers disagree widely — reported TotalSource estimates range from roughly $150 to $350 per employee per month depending on the source and whether benefits are included. HRPair does not reproduce those numbers as fact. Get both quotes on the same census and compare the all-in administrative fee plus benefits line by line.
The Insperity worksite-employee and client counts above come from Insperity's own legislative testimony and are Insperity's figures. The TotalSource claims come from ADP's own comparison pages and are ADP's figures. Each vendor is describing itself favourably against the other.
Both models replace your existing benefits plans with the PEO's sponsored plans, and both involve significant exit friction — unwinding co-employment, replacing benefits, and migrating payroll. That is true of any PEO, not a differentiator between these two.
Insperity is HRPair's preferred partner for the 10–200 band. That reflects routing economics, not a judgment that it beats ADP for every buyer.