HR Outsourcing Cost: The Complete Pricing Guide

HR outsourcing pricing is frustratingly opaque. One provider quotes per employee, another a flat monthly fee, a third a percentage of payroll, and almost none publish real numbers. This guide fixes that. Below is a specific, honest breakdown of what HR outsourcing actually costs by company size and model, including the setup fees and excluded services most guides gloss over. Use the calculator to estimate your own cost, then read the detail underneath.

The three HR outsourcing pricing models

Before any number makes sense, you have to know which model you are pricing, because they are quoted in incompatible units.

Flat monthly retainer (fractional HR)

A fixed monthly fee regardless of headcount, typically $1,800 to $6,500 per month. You pay the same whether you have 20 employees or 50. This is the most predictable model, and it does not penalize growth.

Per employee per month (PEO)

Usually $100 to $200 per employee per month, sometimes quoted as a percentage of total payroll. Cost scales directly with your team, so it grows every time you hire. A PEO also bundles benefits administration and assumes some liability, which can justify the fee, but the administrative cost climbs with headcount.

Base plus per-employee (payroll services)

A base fee (often $40 to $150 per month) plus a per-employee charge. The cheapest sticker price, but it covers only payroll, leaving every other HR function and its cost on you.

HR outsourcing cost by company size

Here is the specific breakdown, since "it depends" is not an answer. These are typical ranges for fractional HR (flat) versus a PEO at roughly $125 per employee per month in administrative fees.

The pattern is worth understanding. At very small sizes, a PEO's per-employee fee can be lower than a fractional retainer. Around 30 employees they converge. Above that, the flat retainer pulls clearly ahead on administrative cost, and the full-time hire only starts to make sense as you approach and pass 75 employees, where there is finally enough HR work to fill the role.

The cost for a 30-employee company, in detail

Because this is the most common question we get, here is the 30-employee case spelled out. Fractional HR runs about $3,500 per month, roughly $42,000 a year, flat. A PEO at $125 per employee per month runs about $3,750 per month, roughly $45,000 a year in admin fees, plus the benefits premiums themselves. A full-time HR manager would cost about $80,000 a year fully loaded, for a role that is often not full at 30 people. For most 30-person companies, fractional HR is both the lowest and the most predictable cost, which is why it is the common choice at that size.

Setup fees and what's excluded

The recurring price is only part of the cost, and the parts people miss are the setup fees and exclusions.

Setup and implementation fees

PEOs commonly charge one-time setup or implementation fees to onboard your company, migrate data, and configure benefits. Payroll services may charge implementation fees. Fractional HR firms sometimes charge a one-time onboarding fee and sometimes waive it. Always confirm setup costs separately, because they are easy to leave out of a side-by-side comparison and can be significant.

What's typically excluded from the quoted price

• Benefits premiums themselves. A PEO administers benefits, but you still pay for the actual coverage on top of the admin fee.
• Workers' compensation premiums. Often separate.
• Additional state registrations as you hire in new states.
• Off-cycle payroll runs and year-end filings, sometimes billed extra.
• Special projects outside the core scope, like a compliance audit or a handbook build.

Industry-specific pricing

Some HR outsourcing costs are driven by industry rather than just size. A law firm or medical practice with strict compliance needs, or a company in a heavily regulated sector, may pay more for the additional compliance depth. A compliance audit for a professional-services firm, for example, is usually priced by scope: single versus multi-state, number of employees, and how deep the review goes. The industry does not change the pricing model, but it can change where you land within the range.

HR outsourcing versus a full-time hire

The comparison most small businesses actually care about is outsourcing versus hiring. A full-time HR manager runs $70,000 to $90,000 a year fully loaded, once you add benefits, taxes, and tools. Fractional HR at $1,800 to $6,500 per month is roughly a quarter of that, and critically, you only pay for the senior time you actually use rather than filling a 40-hour week you do not yet have. For companies under about 75 employees, the math consistently favors outsourcing. (More in our fractional vs full-time cost breakdown.)

How to get an accurate quote

• Know your model. Decide whether you want flat (fractional), per-employee (PEO), or payroll-only, then compare like with like.
• Convert to annual cost at your real headcount before comparing quotes.
• Ask about setup fees separately from the recurring price.
• Get the exclusions in writing: benefits, workers' comp, extra states, projects.
• Match scope to need. Do not pay for full-service HR if you only need compliance and the occasional hard call.

The bottom line

HR outsourcing ranges from cheap-and-narrow (payroll, from a base fee plus per-employee) to scaling-with-headcount (PEO, $100 to $200 per employee per month plus benefits) to flat-and-full (fractional HR, $1,800 to $6,500 per month). For most small businesses under 75 employees, the flat retainer is both the most predictable and the most cost-effective, especially once you account for setup fees and exclusions. Use the calculator above to estimate your own cost, and if you want an exact quote with nothing hidden, that is exactly what a free assessment gives you.