PEO pricing comes in two shapes: a flat fee per employee per month, or a charge calculated as a share of your total payroll. Underneath either shape, the invoice is really three different kinds of money: the PEO's administrative fee, statutory costs that exist with or without a PEO, and insurance premiums the PEO is reselling. Comparing providers only works once those three are separated, because a quote can move cost between the layers without changing its headline.
Per-employee pricing versus a share of payroll
A per-employee fee is predictable and easy to compare: headcount times rate. Its weakness is that it prices a junior hire and a senior one identically, so providers quoting this way sometimes add tiers or minimums. Pricing as a share of payroll scales with salaries, which means your PEO bill rises automatically with every raise you give, even though the administrative work of running one more payslip did not change. Neither model is inherently cheaper; the honest comparison is to model both against your actual payroll for the next year, including planned raises, and to ask each provider for the same quote structured both ways. A provider unwilling to restructure the quote is telling you something about which way the numbers point.
Admin fee, statutory costs and pass-throughs are different money
The administrative fee is what the PEO earns for payroll processing, HR support and compliance work; it is the only part that is genuinely the PEO's price. Employer taxes, such as Social Security, Medicare and unemployment insurance, are statutory: under co-employment the PEO remits wages and employment taxes under its own EIN and issues the W-2, but the money is yours either way and no provider should present remitting it as a service worth a margin. Insurance, chiefly workers compensation and health premiums, is a resale: the PEO's buying power can genuinely beat what a small employer gets alone, but the markup is invisible unless the quote itemises premium separately from fee. Insist on an invoice format that shows all three layers as lines.
What moves the price for your specific business
Headcount and average salary set the base. Claims history and industry risk move the workers compensation component, white-collar work pricing far below field labour. The benefits package you elect moves the health premium layer more than any other choice you make. Setup fees, per-run charges, off-cycle payroll costs and early termination clauses sit in the contract's back pages and change the effective price without touching the headline rate. PEOs serve about 200,000 businesses in the US, so pricing is competitive and quotes are negotiable; the leverage comes from arriving with a like-for-like comparison rather than a stack of differently shaped quotes.
How to run a clean comparison
Ask every candidate for the same four numbers on your real census: the admin fee isolated, per employee per month; the workers compensation charge and how your claims history affects it; the health plan premium for a defined benefits package; and every one-time or conditional fee in the agreement. Check whether the provider holds IRS CPEO certification, which speaks to federal employment tax administration, and read the exit terms: what notice the contract requires, and what happens to benefits and claims history when you leave. The service agreement controls the price; nothing on this page is financial or legal advice.
Questions people ask about peo pricing
How do PEOs charge?
Either a flat fee per employee per month or a charge computed as a share of total payroll. The same provider will often quote both ways on request, and modelling both against your planned salaries for the year is the only reliable comparison.
Is the whole PEO invoice the PEO's fee?
No. The invoice mixes the PEO's administrative fee with statutory employer taxes it remits on your behalf and insurance premiums it resells. Only the admin fee is the provider's price, which is why itemisation matters more than the headline number.
Why does payroll-based pricing get more expensive over time?
Because the charge is a function of salaries: every raise increases the PEO bill even though the administrative work is unchanged. Per-employee pricing does not have that property, which is why growing firms often prefer it.
What should I check besides the rate?
Setup and off-cycle fees, minimum terms, exit notice, what happens to your benefits and claims history on leaving, and whether the provider holds IRS CPEO certification for the federal employment tax side.