PEO vs ASO: Keep Your Plans or Move to Theirs?
An administrative services organization handles payroll and HR administration while you stay the sole employer, keep your own benefit plans, your own broker and your own unemployment account. A PEO co-employs your staff and brings its own plans and buying power. You are trading control for scale.
The structural difference
Under an ASO you remain the sole employer. Your FEIN, your benefit plans, your broker relationship, your unemployment insurance account, your experience rating. The ASO is a vendor performing administration for you.
Under a PEO you enter co-employment. The PEO's plans, the PEO's arrangements, and — depending on the state — its handling of your unemployment account and experience rating.
Everything else in the comparison is downstream of that.
Side by side
| PEO | ASO | |
|---|---|---|
| Employer status | Co-employment | You remain sole employer |
| Benefit plans | The PEO's | Yours, kept |
| Your broker relationship | Usually ends | Kept |
| Workers' compensation | Often a master policy | Your own policy |
| Unemployment account and experience rating | State-dependent; may move | Yours, unchanged |
| Buying power on benefits | The provider's scale | Your own scale |
| Visibility to employees | High — new plans, new pay stub | Low |
| Typical fee shape | PEPM or a percentage of payroll | PEPM, generally lower |
| Exit complexity | Higher: plans, accounts, filings | Lower |
| Best when | You want benefits and comp pricing you cannot reach alone | You have plans worth keeping and want the admin lifted |
Choose an ASO when
- Your existing health plan is genuinely good, or your workforce is attached to
it, and losing it would cost you more in goodwill than the admin fee saves.
- Your broker relationship is doing real work for you.
- Your unemployment experience rating is favourable and you do not want it
disturbed.
- Your headcount is large enough that your own plan pricing is competitive.
- You want the administrative burden lifted without a change your employees feel.
Choose a PEO when
- You cannot buy the benefits you want at your headcount, and that is the actual
problem you are trying to solve.
- Workers' compensation is expensive or hard to place in your class codes.
- You employ across several states and the multi-state compliance load is the
thing eating your week.
- You have no internal HR function and are not going to build one soon.
The comparison people get wrong
Comparing the ASO administrative fee against the PEO administrative fee and concluding the ASO is cheaper. It usually is, on that line. But a PEO's value is concentrated in benefits and workers' compensation pricing, so the only comparison that means anything is total employment cost, holding plan design and employer contribution constant.
That is a genuinely hard comparison to run, and it is the reason our cost calculator is explicit about what it excludes rather than producing a confident single number.
The questions that decide it
- What is your current plan really worth? Run the numbers on your own plan
against what the PEO's equivalent plan would cost at your headcount. If your plan is competitive, the PEO's biggest selling point disappears.
- Is the broker doing work you would have to replace? Losing a good broker
is a real cost that never appears on a fee schedule.
- What happens to your unemployment account? Under a PEO, how your
experience rating is treated varies by state. Under an ASO it stays yours, untouched. State rules vary.
- How attached is your workforce to the current plan? A benefits change is
an employee-relations event, and it lands at the worst possible time — open enrolment, or during a hire you need to close.
- Why are you making this change at all? If the answer is "I need HR
administration lifted," that is an ASO-shaped problem. If it is "I cannot buy the benefits my people deserve at this headcount," that is a PEO-shaped one.
A rule of thumb for the trade-off
Under roughly fifty employees, a PEO's buying power advantage is usually the stronger side of the trade. Past a few hundred, your own scale is real, and the ASO side — your plans, your broker, your accounts — starts to win for most employers. Between those, it genuinely depends on your industry, your states and your plan history, which is exactly when the table above earns its keep.
The exit question nobody asks first
Ask about the exit before you ask about the fee. Leaving a PEO means rebuilding your own payroll, benefits and unemployment accounts — work that lands on you while you are also trying to run the business. An ASO exit is comparatively small: the administration contract ends, everything else was always yours. Knowing which exit you can afford shapes which entry makes sense.
Next
Frequently asked
Is an ASO cheaper than a PEO?
The administrative fee is often lower, but the comparison is incomplete. A PEO's value is largely in benefits and workers' compensation pricing you cannot reach alone, so the right comparison is total cost including insurance, not the admin fee in isolation.
Can I move from a PEO to an ASO later?
Yes, and plenty of employers do once headcount makes their own plans viable. Plan the transition around a plan year and your unemployment account, not around a convenient month.
Does an ASO change my employees' pay stub?
Not in the same way. You remain the employer of record, so the change is far less visible to staff than a PEO transition.
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