These three get compared as if they're competing for the same job. They're not quite. A PEO is infrastructure: it handles payroll, benefits, and compliance paperwork, but it doesn't make decisions about your people. An in-house HR hire is a decision-maker, but a single generalist hire rarely covers the full range of what a growing company needs. A fractional People partner is decision-making judgment without the infrastructure, which means it usually needs to sit on top of something, either a PEO or existing payroll software, rather than replacing it.
These figures are estimates for planning purposes and are not tax, accounting or legal advice. Confirm the numbers for your own situation with your accountant or counsel.
What each one actually covers
PEO (professional employer organization). A PEO co-employs your staff, which lets a small company access benefits, workers' comp rates, and compliance infrastructure usually only available to much larger employers. It runs payroll, administers benefits, and handles a lot of the paperwork side of employment law. What it does not do: make decisions about who to hire, how to structure comp, how to handle a difficult performance conversation, or whether your people function is actually working. A PEO is a vendor, not an advisor.
In-house HR hire. A dedicated person, usually a generalist at smaller companies, who owns people decisions day to day: hiring process, onboarding, performance issues, policy questions, culture. The strength is dedicated attention and institutional knowledge. The limitation is range: one generalist hire, especially an early one, is rarely deep in compensation design, compliance across multiple states, and recruiting all at once. You get full-time presence at the cost of full-time breadth.
Fractional People partner. Senior HR judgment, bought part-time, usually layered on top of a PEO or existing payroll system rather than replacing it. A fractional partner handles the decisions a PEO won't (comp structure, hiring strategy, handling a people problem before it becomes a legal one) without the fixed cost of a full-time generalist. This fits companies past the point where founders can wing people decisions, but before the headcount justifies a full-time hire.
What each one costs
PEO: PEOs price one of two ways, either as a percentage of total payroll or as a flat fee per employee per month. The percentage model is the harder one to evaluate, because the large providers that use it (ADP TotalSource, Paychex) quote custom and publish nothing, so there's no public figure we'd stand behind. Ask any provider quoting a percentage to convert it to a per-employee monthly number so you can compare it against the published plans. Justworks currently lists PEO Basic at $79 per employee per month and PEO Plus at $124, with a payroll-only plan at $8 per employee per month plus a $50 base fee. Verified October 2026. This cost is on top of whatever salaries and benefits you're already paying, it's the price of the infrastructure, not the people.
In-house HR hire: the Bureau of Labor Statistics puts the median US human resources manager at $149,280 a year and the median HR specialist at $75,940 (May 2025 data). Which one you're actually hiring matters more than the averages suggest: a generalist running your whole people function is closer to the manager figure than the specialist one. Add employer taxes and benefits, realistically 20 to 30 percent on top of base for a salaried role, and a single hire lands somewhere between $91,000 and $194,000 a year fully loaded depending on which level you're buying. That's before accounting for the gap in coverage any one person has.
Fractional People partner: this splits by seniority, and the split matters because the two tiers are often quoted as if they were the same product. Generalist and coordinator-level support runs roughly $1,500 to $4,000 a month, or $75 to $150 an hour. Senior partner-level work, someone who can actually design comp structure and carry a compliance judgment call, runs higher: Go Fractional's marketplace data puts fractional CHRO rates at an average of $177 an hour, with the middle 50 percent between $125 and $225, which it translates to roughly $6,500 to $11,700 a month at around 13 hours a week. Project-based engagements (building comp bands, a leave policy, an onboarding system) commonly run $2,000 to $15,000 depending on scope, though that range reflects what we and others quote rather than any published survey.
The question that actually decides it
A PEO answers "who's going to run payroll and get us group benefits rates," not "who's going to make good people decisions." Almost every growing company needs that infrastructure question answered one way or another (PEO, or payroll software plus a benefits broker). The real decision is layered on top: do you need a full-time person making people decisions, or does a fractional partner's hours cover the volume and complexity you actually have right now?
Most companies under roughly 20 to 30 employees don't generate enough people-decisions volume to justify a full-time generalist, but they generate more than a founder can handle safely alone, especially once compliance risk (multi-state hiring, contractor classification, leave coverage) enters the picture. That gap is exactly where a fractional partner, layered on a PEO's infrastructure, tends to fit best.
Separate the two questions before you shop for either. Infrastructure (payroll, benefits administration) is a vendor decision almost every growing company has to make anyway. Judgment is the separate layer on top, and a PEO will never supply it no matter what tier you buy. Knowing which one you're actually short on saves a wasted quarter.