Asking what makes a good professional employer organisation gets you a list of adjectives from every provider that sells one. A more useful question is which qualities can be checked before you sign and which can only be discovered afterwards, because the first list is short and worth working through carefully.
What you can check in advance
Certification status through the IRS public listing, for the legal entity named in your contract rather than the brand. The benefits: which carrier, which plan, and the employee contribution schedule at your own demographics. The workers' compensation classification codes proposed for each of your roles. And the fee structure, converted into the same shape as every other quote you hold. Four things, all documentary, all obtainable before signature.
What you can only find out later
Whether the advice line answers usefully. Whether payroll corrections are handled without a fight. Whether the account manager stays. These are the things clients actually complain about, and no amount of due diligence surfaces them reliably. The nearest available proxy is a reference from an employer of your size and shape, asked for specifically rather than accepted from a list of the provider's happiest clients.
The question that reveals most
Ask what leaving looks like: notice, benefit renewal timing, what happens to your workers' compensation experience, whether you can get a loss history. A provider that answers plainly is confident you will not want to. A provider that becomes vague has told you something important about the years in between.
Questions people ask about good peo
What should I look for in a PEO?
Four checkable things: IRS certification for the entity in your contract, the actual benefit plan and its employee contribution schedule, the workers' compensation classification codes for your roles, and the fee in a shape comparable with your other quotes.
Is a bigger PEO better?
Scale helps with benefits pooling and says nothing about service. Some providers publish client counts and retention figures; those are the provider's own numbers and worth asking about, not worth taking as a verdict.
What is the best question to ask a PEO?
What leaving looks like. Notice period, benefit renewal timing, treatment of your workers' compensation experience and whether you can obtain a loss history. The clarity of the answer tells you a great deal.