Your 401(k) When Leaving a PEO: What Happens and How to Transition It

When companies start evaluating a PEO exit, the 401(k) plan is usually the thing that generates the most anxiety. Your employees' retirement savings are involved. There are IRS rules, DOL compliance requirements, blackout periods, and asset transfers to coordinate. It feels complicated because it is. But it's also entirely manageable when you plan for it from the start, not as an afterthought.

Here's what you need to know.

Why You Can't Keep Your PEO's 401(k) Plan

Most PEOs sponsor a Multiple Employer Plan (MEP) or a master 401(k) that your employees participate in. When you leave the PEO, you leave the plan. Your employees can't stay on the PEO's 401(k) once the co-employment relationship ends. That means you need a new plan in place before you exit.

Setting up a new 401(k) plan typically takes 9 to 12 weeks. That timeline is one of the reasons we insist on a minimum of 90 days for any PEO exit. The 401(k) transition needs to run in parallel with everything else.

The Blackout Period

When assets transfer from the PEO's plan to your new plan, there's typically a blackout period during which employees cannot make changes to their accounts, take loans, or make new elections. This can last anywhere from a few days to a few weeks depending on the complexity of the transfer and the providers involved.

This is the part employees notice. They'll get a notification that their account is temporarily frozen. If it's not communicated well in advance with a clear explanation of why it's happening and when it will end, you'll get a flood of worried questions from your team.

The fix is straightforward: communicate early, communicate clearly, and give employees a specific timeline. We help draft these communications as part of the transition so your HR team isn't scrambling to answer questions they don't have answers to.

Fiduciary Responsibility Shifts to You

Inside a PEO, the PEO typically serves as the plan sponsor and shares fiduciary responsibility for the 401(k). When you leave, your company becomes the full plan sponsor. That means you're responsible for selecting and monitoring investment options, ensuring plan fees are reasonable, maintaining compliance with ERISA, and managing annual filings like the 5500.

This sounds heavy, and it is a real responsibility. But it's also manageable with the right provider and advisor in place. The key is choosing a 401(k) provider and a plan advisor who will carry the operational weight, not just hand you a login and wish you luck.

Choosing a New 401(k) Provider

Your new provider handles recordkeeping, participant accounts, compliance testing, and plan administration. The market has plenty of strong options, and the right one depends on your company size, plan complexity, and what level of support you want.

Here's what to evaluate when selecting a provider:

Investment menu quality and flexibility. You want a range of low-cost index funds alongside actively managed options. Look for providers that offer open architecture, meaning they're not locked into a single fund family.

Fee transparency. Every plan has fees. The question is whether they're clearly disclosed and competitive. Revenue sharing, asset-based fees, per-participant charges, and advisor compensation should all be spelled out. If a provider can't give you a clear fee breakdown, that's a red flag.

Compliance support. Your provider should handle annual compliance testing (ADP/ACP, top-heavy, coverage) and the 5500 filing. Some providers include this in their base fee. Others charge extra. Know what you're getting.

Employee experience. Your employees are the plan participants. They need a modern portal, a mobile app, and clear tools for enrollment, contribution changes, and retirement projections. The PEO's plan was probably fine. Your new plan should be better.

Selecting a Plan Advisor

This is a step PostPEO and other exit consultants barely mention, but it matters. A dedicated retirement plan advisor (not your general wealth advisor who handles a few plans on the side) will serve as the investment fiduciary for your plan. That means they take on the legal responsibility of selecting and monitoring investments, which significantly reduces your company's exposure.

A good plan advisor will also benchmark your plan fees annually, conduct employee education sessions, and serve as an extension of your HR team for any 401(k) questions. They should offer holistic financial planning for employees, not just help them pick a target-date fund.

Managing the Asset Transfer

The transfer of assets from the PEO's plan to your new plan has to be handled carefully. This is a trustee-to-trustee transfer, meaning the money moves directly between plan custodians without employees touching it. Done correctly, there are no tax implications or penalties for participants.

The process involves your PEO providing a final participant census with account balances, vested amounts, and loan balances. Your new provider sets up the receiving accounts. The transfer is initiated, and assets move over during the blackout period. Once complete, employees regain access to their accounts under the new plan.

Loan balances require special attention. If an employee has an outstanding 401(k) loan, it needs to transfer to the new plan or be paid off. If it's not handled properly, the outstanding balance could be treated as a distribution and trigger taxes plus a 10% early withdrawal penalty for employees under 59½. This is one of the details that separates a well-managed transition from a messy one.

Timeline: Where the 401(k) Fits in the Exit

The 401(k) transition runs in parallel with your benefits and HRIS setup. Here's roughly how it maps:

Weeks 1-3: Identify and evaluate new 401(k) providers and plan advisors. Request proposals.

Weeks 3-5: Select provider and advisor. Begin plan document setup and compliance review.

Weeks 5-10: New plan is established. Employee communications about the transition and blackout period are sent. Enrollment materials are distributed.

Weeks 10-13: Asset transfer and blackout period. Employees move to new plan. First payroll contributions flow to new provider.

This is why starting early matters. If you wait until 60 days before your PEO exit to think about the 401(k), you're already behind.

The Upside Nobody Talks About

Most content about 401(k) transitions focuses on the risks and complexity. Fair enough. But there's a meaningful upside that doesn't get mentioned: you'll almost certainly end up with a better plan.

PEO 401(k) plans are pooled, which means limited investment options, less flexibility on plan design (matching formulas, vesting schedules, eligibility), and fees that are often higher than what a standalone plan would cost. When you set up your own plan, you can customize the match, choose lower-cost funds, offer a broader investment menu, and design a plan that actually reflects your company's compensation philosophy.

For employees, that usually means better investment options and lower fees, which translates to more money in their accounts at retirement. That's a win you can communicate to your team during the transition.