Your 401(k) Under a PEO

Written by Peolet Editorial · Reviewed by Peolet Editorial · Last verified 2026-10-25

The structure, stated plainly

In the ordinary PEO retirement arrangement, the provider is the plan sponsor. It adopts the plan document, selects the recordkeeper and trustee, and files the annual return. Your business signs a participation agreement and becomes a participating employer, able to elect some design features within the limits the document allows — eligibility, match formula, vesting on employer contributions — but not to amend the plan.

Two related structures get used interchangeably in conversation and are not the same thing.

A multiple employer plan is a single plan maintained by more than one employer, which is the long-standing PEO structure. A pooled employer plan is a creature of more recent legislation, available to unrelated employers through a pooled plan provider registered with the Department of Labor, and it carries its own statutory conditions. Both achieve something similar for a small employer — one plan document, one audit, administration handled centrally — and they are governed differently. Ask which one you are being offered, and ask it in writing.

The governing body is the Employee Benefits Security Administration at the Department of Labor, whose pages are at dol.gov/agencies/ebsa. The Department issued interpretive guidance on pooled employer plans in 2025, published in the Federal Register, addressing how a pooled plan provider's duties and a participating employer's residual duties fit together. If a pooled plan is on the table, that guidance is the document to read rather than the provider's summary of it.

What you actually give up and keep

The two rows at the bottom are the ones to internalise. There is no arrangement under ERISA in which an employer selects a provider and then has no further responsibility. Selection is a fiduciary act; monitoring the selection is a continuing fiduciary act. Practitioner commentary on multiple employer plans consistently observes that enforcement attention and litigation land on the sponsor rather than on participating employers, which is a real and material advantage. It is not the same as having no exposure, and your duty to monitor is discharged by actually monitoring: reviewing the fee disclosures, reading the plan's annual reporting, and documenting that you did.

How to check the plan from public records

You do not have to take a provider's word for the plan's condition. Annual returns on Form 5500, with schedules, are public and searchable.

1. Find the plan on the Department of Labor's filing search at

efast.dol.gov — search by the sponsor's legal entity name, which is on the participation agreement, not the brand name.

1. Read the schedule of fees and the service provider information. You are

looking for what the plan pays, to whom, and whether anything is paid to an affiliate of the sponsor.

1. Read the auditor's report where one is attached, and specifically any

finding or qualification.

1. Check the filing history. Late filings and amended returns are not

automatically a problem and they are worth a question.

1. Ask for the fee disclosure required of covered service providers, and the

participant-level fee disclosure your employees receive. Then compare the all-in cost against what a standalone plan would cost you. For a small employer the pooled structure is often genuinely cheaper; for an employer with a few hundred participants and real assets, sometimes markedly not.

The exit, which is the expensive part

When co-employment ends, your employees stop being eligible to participate in a plan sponsored by a company they no longer have an employment relationship with. Three broad paths exist, and which are available to you is determined by the plan document and by the sponsor's administrative practice, not by your preference.

Establish your own plan and move the assets. You adopt a new plan, and the participating-employer assets are transferred into it. This preserves participants' balances, deferral elections where practicable, and loans — and loans are the detail that most often goes wrong. An outstanding participant loan that cannot be transferred and ends up treated as a deemed distribution produces a taxable event for an employee who did nothing wrong, and they will remember it.

Spin off the participating-employer portion. Mechanically similar, treated as a spin-off of a portion of the plan into a new plan. The accounting and the documentation differ, and the lead time is longer.

Terminate participation and distribute. Accounts become distributable; participants roll over or take cash. This is the simplest to administer and the worst outcome for your employees, because a meaningful share will take the cash, pay the tax and the early distribution penalty, and lose the retirement savings. If you are choosing a path, weigh that.

Each path involves the sponsor, the recordkeeper, the trustee, your own new provider, and usually ERISA counsel. Start the conversation three to six months before the exit date, not when notice is given.

The question to ask before you join

Ask it before signature, because the answer will never be better than it is while you are still a prospect:

At termination of the service agreement, what are our options for the retirement plan assets of our employees, who initiates each one, how long does each take, what does each cost, and how are outstanding participant loans handled under each?

Get it in writing. Then read it against the rest of your exit terms — the notice window, the exit-fee schedule, and the data you are entitled to on the way out, all covered in what is not in the quote and what actually moves a PEO contract. If a provider cannot describe its own exit mechanics, you have learned something about how often it has done it cleanly.

Keeping your own plan instead

The option buyers forget is the middle one: use the PEO for payroll, benefits and administration, and keep your existing 401(k) as your own standalone plan. You keep the sponsor duties, the plan-level audit obligation if you are large enough to have one, and the recordkeeping relationship. In exchange you keep control of the investment menu and the fees, and you remove the retirement plan from the exit project entirely.

Whether a provider supports this varies, and it is worth asking early. For an employer with existing assets, a settled investment line-up and any intention of reassessing the arrangement in a few years, the cost of keeping your own plan may be the cheapest insurance in the deal.

What to do next

1. Establish which structure you are being offered — multiple employer plan

or pooled employer plan — and get the plan document and participation agreement before you sign, not after.

1. Look the plan up on the public filing search and read the fee schedule and

the auditor's report.

1. Get the exit question above answered in writing.
2. Decide deliberately whether to keep your own plan. Default inertia is not

a decision.

1. Document your monitoring. Once a year, read the fee disclosures and the

annual reporting and write down that you did. That record is what a fiduciary duty to monitor looks like in practice.

1. Do not buy a PEO for the retirement plan alone. A pooled or multiple

employer plan is available from recordkeepers and from pooled plan providers directly, without co-employment attached. If a better retirement plan is the whole reason you are shopping, price that product on its own first, then run your situation through the decision tool and read PEO vs ASO. Peolet is not a PEO, does not sponsor plans and is not a fiduciary to anyone; plan selection, transfers and terminations are decisions for ERISA counsel and your own advisers, and the consequences of getting them wrong fall on participants.