Your Experience Mod Under a PEO
When your employees are covered under a PEO's master workers' compensation policy, your premium is usually rated on the PEO's programme rather than on your own experience modification factor, and in many states your own mod is not calculated at all while you have no policy of your own. The loss history is still yours in the sense that the claims happened to your employees, but the rated experience sits with the policy, and what a new carrier will accept when you leave depends on your state rating bureau's rules and on whether your provider will produce loss runs attributable to your employees. Ask for those loss runs annually while you are still a customer, because asking for them during an exit is the worst possible timing.
What the mod is, and why the PEO question is confusing
An experience modification factor is a multiplier applied to your manual workers' compensation premium that compares your actual loss experience against the expected losses for employers in the same classifications. Above 1.00 you pay more than the class average, below 1.00 you pay less. The mechanics in most states are set out in the Experience Rating Plan Manual administered by the National Council on Compensation Insurance at ncci.com. Several states run their own independent bureaus instead — California through the Workers' Compensation Insurance Rating Bureau at wcirb.com, New York through nycirb.org, Pennsylvania through pcrb.com, among others — and their rules are not identical.
The confusion about PEOs comes from the fact that a mod attaches to rated payroll and losses under a policy. Inside a PEO arrangement, your worksite employees are covered under the provider's master policy. Your payroll is reported under that policy. The claims are reported under that policy. So the question "what happens to my mod" has an uncomfortable answer: in a number of states, nothing happens to it, because there is nothing to rate.
The three things people conflate
| Thing | Where it lives | Survives a PEO period? |
|---|---|---|
| Your claims history (the events) | Your own records, the carrier's records, OSHA logs | Yes, if you keep and request the documentation |
| Rated experience (payroll and losses reported to the bureau under your name) | The rating bureau, tied to a policy | Often not, while you have no policy of your own |
| Your promulgated mod (the published factor) | The rating bureau | May lapse for want of current rated data |
This distinction is the whole article. A PEO cannot take your claims history away from you — those are facts about your workplace. What a PEO period can do is interrupt the stream of reported data that a bureau uses to calculate and republish a factor in your name. After two or three years inside a master policy, an employer who leaves may find that there is no current mod to apply, which means a new carrier rates them on class codes and judgement instead.
Whether that helps or hurts you depends entirely on which direction your mod was heading. An employer with a bad loss record and a mod above 1.00 may quietly benefit. An employer who spent years building a mod well below 1.00 may have been giving away the discount it earned, which is a real and rarely quoted cost of co-employment.
Why your state matters more than your provider
State treatment differs in ways that are genuinely consequential, and no single rule covers all of them. Among the variables:
- Whether the state requires PEOs to report payroll and losses at the client
level so that client-specific experience continues to be developed.
- Whether a client may, or must, maintain its own policy rather than joining the
master policy — several states restrict or prohibit the master-policy model for some arrangements.
- Whether the state operates a monopolistic state fund, where the whole question
is framed differently, or a competitive market with a private rating bureau.
- Whether the state's PEO statute addresses the treatment of experience at the
start and end of an arrangement at all. Many do not.
We maintain a free, sourced record of PEO registration and related requirements state by state at PEO laws by state, with each field linked to the statute or agency page it came from. That is the right starting point, followed by a direct question to your state rating bureau. It is a question a rating bureau will answer: they publish their manuals and they take enquiries.
What to ask for, in writing, every year
The single most useful habit for any employer inside a PEO is to request loss documentation annually and keep it, whether or not you are thinking about leaving.
- Loss runs attributable to your worksite employees, by claim, with date of
loss, claim status, paid amount and current reserve. Reserves matter: an open claim with a large reserve can affect rating even though nothing has been paid.
- Reported payroll by class code, by policy period, as it was reported to
the carrier under your account within the master policy.
- Confirmation of how the state treats client-level reporting for your
arrangement, and whether any experience is being developed in your name.
- Whatever the provider will commit to in writing about exit — specifically
whether it will produce certified loss runs on request, how quickly, and for how many years back.
That fourth item belongs in your service agreement before signature, not in a support ticket at the end. What actually moves a PEO contract is structure and exit terms, and this is one of the structural terms that costs nothing to ask for at the point you still have leverage.
What a new carrier actually needs
When you leave and go to market for your own policy, an underwriter will ask for three to five years of loss history. If you cannot produce it, you are an unknown risk, and underwriters price unknown risk conservatively. If you can produce clean, carrier-issued loss runs showing low severity and low frequency, you are a credible submission even without a promulgated mod.
So the practical answer to "what do I get back when I leave" is: you get back what you documented. There is no automatic transfer, no portable credit, and no mechanism by which a good safety record inside a master policy becomes a discount on your next policy without paperwork. The paperwork is the asset.
A related trap: do not let anyone characterise a PEO transition as a change in ownership. Ownership changes have their own treatment under experience rating rules, reported on the ERM-14 ownership information form in NCCI jurisdictions, and they can move loss experience between entities. Joining or leaving a co-employment arrangement is not an ownership change. If a form is being filed, read it.
Where this sits in the buying decision
Workers' compensation is one of the three or four reasons employers genuinely need a PEO, and it is also the reason we flag the most caution. Master-policy access can be the difference between being insurable and not, for a small employer in a hazardous class code or with a difficult loss history. That is a real benefit and we do not want to talk anyone out of it.
But if workers' compensation is the only reason you are considering a PEO, run the alternative first. A licensed broker shopping your own policy, a state fund submission where one exists, or a group self-insurance programme in states that permit them, may price competitively against a PEO master policy without bundling your payroll, your benefits and your employment relationships into the same agreement. And unlike the PEO route, it leaves your own rated experience intact and accumulating in your name. That is worth something every year you stay insurable.
What to do next
- Request this year's loss runs and reported payroll from your provider,
today, whether or not you plan to leave. Then diary it annually.
- Ask your state rating bureau whether experience is being developed in your
name under your current arrangement. Start from your state's page in PEO laws by state.
- Put exit loss-run delivery in the contract if you have not signed yet.
See the clauses that are not in the quote.
- If workers' compensation is your whole reason for buying, take a
competing quote from a licensed broker on your own policy before you sign anything. Use the decision tool honestly: the answer it gives some employers is that a PEO is not the right instrument, and for a single-issue insurance problem that is frequently correct.
- Nothing here is insurance advice. Peolet does not place coverage. Mid-term
cancellations, replacement policies and rating disputes go to a licensed broker or to your state bureau.
Frequently asked
Does my experience modifier disappear when I join a PEO?
Not exactly. It stops being applied to a policy of your own because you no longer have one, and in many states it stops being promulgated for lack of reportable payroll and losses under your name. The historical data does not vanish, but after enough years without your own rated policy there may be no current mod to apply when you come back.
Can I take my loss history to a new carrier after leaving a PEO?
Sometimes, and it depends on the state rating bureau and on documentation. The practical determinant is whether your provider will issue loss runs identifying claims by your employees, with paid and reserved amounts. Get these every year while you are a customer rather than at exit.
Is a PEO master policy cheaper than my own policy?
It can be, especially for a small employer in a high-hazard class code or one that carriers are reluctant to write. It can also be more expensive once the administrative margin inside the premium is accounted for, and the comparison is only meaningful when the quote separates premium from fee.
Who reports an ownership change to the rating bureau?
The employer does, in writing, to the insurer, typically within the window set by the applicable experience rating plan rules. In NCCI states this is the ERM-14 ownership information form. This matters because ownership changes can move loss experience between entities, and PEO transitions are sometimes mistaken for ownership changes when they are not.
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