How to Switch PEOs Without Wrecking Your Books
Switching PEOs is usually a good decision. The service slipped, the renewal came in 14% higher, or you outgrew what they do well.
The switch itself is straightforward — sign, transition, done. What nobody warns you about is what it does to your books and your tax bill, and by the time you notice, the money is already gone.
Here’s what to handle before you sign.
The mid-year switch can cost you real money
This is the part that surprises people, so it goes first.
Payroll taxes are calculated against annual wage bases. Social Security stops at a cap per employee per year. Federal unemployment tax applies to the first $7,000 of each employee’s wages. State unemployment has its own base, and yours depends on your experience rating.
When you change PEOs mid-year, those wage bases may restart from zero under the new PEO’s tax ID.
For an employee already past the Social Security cap, that means paying employer Social Security tax on the same wages a second time. On FUTA, you’re paying the tax on the first $7,000 again. SUTA restarts too, often at the new PEO’s rate rather than your earned experience rating.
Whether the bases carry over depends on whether the new PEO qualifies as a successor employer for your workforce. Some do. Some don’t. Some will if you ask and structure it correctly.
Ask both PEOs this question in writing, before you sign: will year-to-date taxable wages transfer, or do the wage bases restart? Get the answer in the contract, not in an email from a salesperson.
If the answer is “they restart,” you now have a number to negotiate against — or a reason to wait.
January 1 is worth waiting for
A switch effective January 1 sidesteps the wage base problem entirely. Clean year, clean books, one set of quarterly filings per entity.
If it’s August and the current PEO isn’t actively hurting you, running out the year is usually cheaper than the mid-year tax cost. Do that math before you decide, not after.
The exception is when the current PEO is failing at something that matters — missed filings, benefits problems, remittance you can’t verify. Then switch now and treat the tax cost as what it is: the price of leaving a bad situation.
Get these before your access is turned off
Once you leave, the outgoing PEO’s portal stops being yours. People discover this in February, when they need something for a return.
Download and save, before the last day:
Quarterly wage reports for every quarter under that PEO
Year-to-date payroll register by employee, through the final check date
All invoices for the year, with detail
Workers’ comp policy documents and class code assignments
Employee benefit enrollment records and deduction history
Any state registration or account documents filed on your behalf
Put them somewhere permanent. Not the portal. Not one person’s inbox.
The wage reports matter most. You’ll be reporting a full year of wages on your books with no single tax return under your EIN backing it up — those quarterlies are your support.
Your books will show one year and two employers
Your P&L runs January to December. Your payroll history now runs January to July under one entity and August to December under another.
That’s fine, and it doesn’t change how you record anything. Wages are wages, employer taxes are employer taxes, and the PEO administrative fee still gets its own account. Same chart of accounts, same entry structure, both halves of the year.
Three things to keep consistent so the year stays comparable:
Use the same accounts. Don’t let the new PEO’s invoice format push you into new expense categories. If the old invoice broke out workers’ comp and the new one bundles it, break it back out.
Keep your class or department tracking. New invoice layout, same splits.
Watch the admin fee line. New PEO, new fee structure. That account is now the cleanest before-and-after comparison you have — it tells you whether the switch actually saved money once everything settled.
The reconciliation nobody does
At year end, add up wages from both PEOs and tie the total to your books.
They should match. When they don’t, it’s almost always one of three things: a final check from the old PEO landing in the new PEO’s period, a bonus run processed outside the normal cycle, or benefit deductions handled differently by each provider.
Find it in January, while both sets of records are still accessible and someone still remembers. Finding it in April is a much worse afternoon.
Four things that go wrong
Switching mid-year without asking about wage bases. The most expensive mistake on this list, and the easiest to avoid.
Losing portal access before pulling records. Set a calendar reminder for a week before the cutoff.
Letting the chart of accounts drift. Two different expense structures in one year means you can’t compare anything to anything.
Assuming state registrations move automatically. Some do, some don’t. Ask which accounts are in your name versus the PEO’s, and what happens to each one.
One question worth asking upfront
Is the new PEO IRS-certified?
A certified PEO under IRC §7705 carries sole liability for federal employment taxes on the wages it pays. With a non-certified PEO, you can still be on the hook if they collect the money and fail to remit it.
That question matters most during a transition, when two entities are both handling your payroll in the same year and the handoff is exactly where things fall through.
If you’re switching PEOs this year, the reconciliation and the record-pull are worth doing right. I handle these transitions for clients — pulling the outgoing records, keeping the chart of accounts consistent across both halves, and tying the year together at close.
Book a call if you want a second set of eyes on the transition before you sign.
