PEO pricing models fall into two main structures: a flat fee per employee per month (PEPM) or a percentage of your total payroll. The model your PEO uses has a direct impact on how much you pay — and how predictable those costs are — especially as your business grows or your salaries change. Understanding the difference before you sign a contract could save your company thousands of dollars per year.
What Are the Two Main PEO Pricing Models?
Every PEO charges for the same core services — payroll processing, HR administration, benefits management, workers’ compensation, and compliance support. The difference is how they calculate your bill. According to NAPEO, the national association representing the PEO industry, businesses work with PEOs to reduce HR costs and administrative burden — but the savings you actually see depend heavily on which pricing structure you’re locked into.
Flat Fee Per Employee Per Month (PEPM)
With a flat fee model, you pay a fixed dollar amount for every employee on your payroll each month, regardless of what that employee earns. Rates typically range from $80 to $200 per employee per month, depending on the PEO, the size of your workforce, and the scope of services included. If you have 25 employees at $120 PEPM, your monthly administration fee is $3,000 — full stop.
Percentage of Payroll
With a percentage of payroll model, your fee is calculated as a percentage of your total gross payroll each pay period. This typically ranges from 2% to 12% of gross payroll, though most competitive PEOs land between 3% and 6% for small to mid-size businesses. If your monthly payroll is $200,000 and your rate is 4%, you’re paying $8,000 per month in PEO fees.
Not sure if a PEO makes sense for your business? Our free calculator shows you the real cost in 60 seconds — no call, no email, no commitment.
Flat Fee vs Percentage of Payroll: Side-by-Side Comparison
| Factor | Flat Fee (PEPM) | Percentage of Payroll |
|---|---|---|
| Cost Predictability | High — fixed per headcount | Variable — rises with raises and bonuses |
| Best For | Higher-wage workforces | Lower-wage or hourly workforces |
| Impact of Raises | None — fee stays flat | Fee increases automatically |
| Impact of Bonuses | None — fee stays flat | Can spike fees in bonus periods |
| Transparency | Easy to audit and reconcile | Can be harder to verify line items |
| Scaling Costs | Grows only with headcount | Grows with headcount AND payroll |
| Common Providers | Justworks, Rippling, Gusto | ADP TotalSource, Insperity, Paychex |
When Does a Flat Fee Model Save You More Money?
The flat fee model works in your favor whenever your average employee salary is high relative to the PEPM rate. Here’s the simple math: if you’re paying $130 PEPM and your average employee earns $90,000 per year, your effective PEO fee rate is roughly 1.7% of payroll — well below what most percentage-of-payroll providers charge.
Flat Fee Wins When:
- Your workforce is primarily salaried professionals (tech, finance, consulting, legal)
- You plan to give significant raises or bonuses — your PEO fee won’t move
- You want simple, predictable invoicing for budget forecasting
- You’re scaling headcount slowly but increasing compensation quickly
In our experience matching hundreds of businesses to PEOs, companies with average salaries above $70,000 almost always save more with a flat-fee provider. If you’re comparing options like Justworks or Gusto, our breakdown at Comparing PEO, Gusto, and Justworks: Which Is Best? walks through exactly how these platforms structure their fees.
When Does a Percentage of Payroll Model Make More Sense?
The percentage of payroll model can actually cost less for businesses with lower average wages, high turnover, or significant fluctuations in headcount. If your employees earn $30,000–$45,000 per year on average, the math often flips in favor of a percentage-based provider.
Percentage of Payroll Wins When:
- You have a largely hourly or part-time workforce (retail, hospitality, light manufacturing)
- Your headcount fluctuates seasonally — you’re not locked into a high per-head fee during slow periods
- You have high turnover and want fees that naturally adjust downward when seats are empty
- You’re a startup with a small number of employees but plan to scale headcount rapidly
According to the Bureau of Labor Statistics, median weekly earnings for service-sector workers remain well below those of professional and business services. For businesses in those lower-wage sectors, a 4% payroll fee on a $25/hour workforce often beats paying $150 PEPM per person.
Red Flags to Watch in PEO Pricing Contracts
Whether you’re looking at a flat fee or a percentage-of-payroll quote, the base rate is rarely the whole story. Based on our analysis of 40+ PEO providers, here are the most common pricing traps that inflate your real cost.
1. Bundled vs. Unbundled Quotes
Some PEOs quote a low base fee and then charge separately for workers’ compensation, benefits administration, EPLI coverage, and state unemployment services. Always ask for a fully loaded quote that includes every service you’ll actually use — then compare apples to apples.
2. Gross Payroll vs. Net Payroll Calculations
This is a critical distinction in percentage-of-payroll pricing. Some PEOs calculate their percentage against gross payroll (before taxes and deductions), while others use net payroll. A 4% fee on gross payroll is meaningfully more expensive than 4% on net. Always clarify the basis before signing. Our post on hidden fees with ADP TotalSource goes deep on this specific issue.
3. Annual Minimum Commitments
Some percentage-of-payroll contracts include annual minimums that lock you into paying a base amount even if your payroll drops. This is especially risky for seasonal businesses. Read the termination and minimum clauses carefully.
4. Rate Escalation Clauses
Both pricing models can include automatic rate increases tied to CPI or at the PEO’s discretion after year one. Ask specifically: what is the maximum rate increase allowed in your contract, and what notice is required?
5. Workers’ Comp Included or Separate?
Workers’ compensation is one of the biggest cost-saving levers a PEO offers — especially for businesses in high-risk industries. Confirm whether it’s baked into your quoted rate or invoiced separately. The IRS recognizes certified PEOs (CPEOs) as the employer of record for certain tax purposes, which affects how workers’ comp is structured and reported.
How to Evaluate PEO Pricing the Right Way
The most reliable way to compare PEO pricing isn’t to chase the lowest headline rate — it’s to calculate your all-in cost per employee per year across every provider you’re considering. Use this formula:
Total Annual PEO Cost = (Admin Fee) + (Benefits Markup) + (Workers’ Comp Rate) + (Any Add-On Fees)
Then divide by your total headcount to get a true cost-per-employee figure. You can also use our free PEO cost calculator to run this comparison in under a minute. For a direct look at how one of the largest PEOs prices against its competitors, see our Insperity cost comparison.
According to NAPEO, businesses that use a PEO grow 7–9% faster and have 10–14% lower employee turnover than those that don’t. But those gains only materialize if you’re not overpaying for the service in the first place. Getting the pricing structure right from day one is what separates a PEO relationship that delivers ROI from one that just adds overhead.
Ready to Find a PEO That Fits Your Budget?
PEO Marketplace works with 40+ vetted providers across both pricing models. We match your business to the right structure — flat fee or percentage — based on your workforce profile, industry, and budget. The matching process is free, unbiased, and takes less than 15 minutes.
Get Matched to the Right PEO for Your Business
Tell us about your workforce and we’ll show you which pricing model — and which providers — save you the most money.
Not ready to book a call? Get a free Benefits Benchmark Report for your industry — we will email you a breakdown of what companies your size are paying for HR, benefits, and workers comp so you can compare on your own timeline.
Frequently Asked Questions
What is the average cost of a PEO?
PEO costs typically range from $80 to $200 per employee per month under a flat fee model, or 3% to 6% of gross payroll under a percentage-based model. The right comparison depends on your average employee salary — higher-wage businesses almost always pay less under a flat fee structure.
Is a flat fee PEO always cheaper than a percentage of payroll PEO?
Not always — it depends on your workforce’s average compensation. For higher-wage employees earning $70,000 or more per year, flat fee pricing typically wins. For lower-wage hourly workforces, a percentage of payroll can result in a lower total fee, especially during periods of reduced headcount or payroll.
What hidden fees should I watch for in a PEO contract?
The most common hidden fees include separate charges for workers’ compensation, benefits administration markups, state unemployment insurance handling, EPLI coverage, and annual rate escalation clauses. Always request a fully unbundled quote and ask your PEO to confirm whether their percentage is calculated on gross or net payroll.
How do I compare PEO pricing across multiple providers?
Calculate the all-in annual cost per employee — including admin fees, benefits markups, workers’ comp, and any add-on charges — for each provider you’re evaluating. Divide total annual cost by headcount to get a true per-employee comparison. PEO Marketplace’s free calculator can do this automatically once you input your workforce details.
Do PEO fees include payroll taxes?
No — payroll taxes such as FICA, FUTA, and SUTA are passed through to you at cost and are not part of the PEO’s administration fee. The PEO’s fee covers the administration and processing of those obligations, not the tax liability itself. Always confirm this with any provider before signing to avoid surprises on your first invoice.
