PEO vs. Payroll Software: How to Choose in 2026

The real fork isn't features — it's who's the employer

This comparison is built from published pricing pages, vendor documentation, and verified user reviews (G2/Capterra) rather than first-hand use of any platform. Every price below is date-stamped, because payroll and PEO pricing move often.

Small-business owners searching "PEO vs payroll software" usually think they're choosing between two flavors of the same tool. They aren't. A PEO (professional employer organization) — Justworks and TriNet are the best-known examples — puts your employees on a co-employment arrangement: the PEO becomes the employer of record for tax and insurance purposes, files under its own FEIN, and bundles your company into its master health, workers' comp, and retirement plans. Payroll software — Gusto and ADP Workforce Now are the standard picks — leaves you as the sole employer of record. The software calculates withholding, files your tax forms, and hands you tools to run benefits, but the FEIN, the workers' comp policy, and the legal employer relationship all stay in your company's name.

That single distinction — co-employment versus employer-of-record-stays-you — drives almost every practical difference: cost, what "benefits" actually means, how multi-state hiring works, and how hard it is to leave.

What a PEO actually does

Under a PEO contract, your company and the PEO co-employ your staff. In practice that means:

• The PEO pools you into its master insurance policies — health, dental, workers' comp — so a 12-person company can access group health rates normally reserved for much larger employers.
• The PEO handles state unemployment insurance (SUI/SUTA) registration in every state where you have employees, because those accounts sit under the PEO's FEIN, not yours.
• The PEO carries the workers' comp policy and typically manages claims administration.
• You still direct day-to-day work — hiring, firing, job duties — the co-employment split is specifically for tax, insurance, and compliance purposes, not operational control.

What payroll software actually does

Payroll software like Gusto or ADP Workforce Now automates the mechanics of paying people and filing the paperwork, but your company remains the sole employer on every account:

• You keep your own FEIN, your own state withholding and SUI accounts, and your own workers' comp policy (often purchased separately or through a pay-as-you-go integration the software offers).
• The software calculates and files your payroll tax deposits and forms — federal 941 quarterly filings, annual W-2s and 940 — on your behalf, but the liability and the account are still yours.
• Group health, if offered, runs through a broker or a smaller-group marketplace the software connects you to — not a master policy pooled with thousands of other employers, so small groups often see less favorable underwriting than a PEO can offer.

The headcount and footprint test

Three questions get most small businesses to the right side of this fork faster than any feature list:

1. How many employees do you have? Under roughly 10-15 employees, group health quotes on the open market are often expensive or thin on carrier choice. A PEO's pooled buying power can materially beat what a standalone broker quotes a company that size. Past 50-ish employees, many businesses have enough scale to get competitive open-market group health anyway, which erodes the PEO's core financial advantage.

2. Are you hiring across multiple states? Every state you add means a new SUI account, new state withholding registration, and sometimes new paid-leave or workers' comp filings. A PEO absorbs that registration burden because the accounts already exist under its FEIN. Payroll software will calculate the taxes correctly, but you still have to open the state accounts yourself (Gusto and ADP both offer registration assistance, but the account is still yours).

3. Do you actually need real group health, or just payroll compliance? If your team is mostly happy with a stipend, reimbursement arrangement, or no company health plan at all, a lot of the PEO's value proposition disappears — you're paying a premium for benefits infrastructure you're not using.

The cost comparison, honestly

PEOs cost meaningfully more per head than payroll software, and that's the trade you're making for the bundled insurance and compliance offload — not a pricing quirk to shop away.

Justworks (checked September 2026) runs standalone Payroll at $8 per employee per month plus a $50 monthly base fee, PEO Basic at $79 per employee per month, and PEO Plus at $109 per employee per month for smaller teams, with volume pricing stepping down to roughly $49-$99 PEPM once a company crosses 25 and then 100 employees. See Justworks pricing

TriNet doesn't publish standard rates; independent 2026 estimates put its full-service PEO administrative fee in the roughly $100-$300 per employee per month range depending on headcount, industry, and benefits scope — you'll need a custom quote to know your number.

Gusto (checked September 2026) prices as standalone payroll software: Simple at $49/month + $6/person, Plus at $80/month + $12/person, and Premium at $180/month + $22/person. Gusto raised Simple-plan pricing in March 2026; per-employee add-on rates across tiers were unchanged at that time. Check Gusto's plans

ADP Workforce Now doesn't publish list pricing either; third-party estimates put software-only access around $23-$30 per employee per month, with fuller outsourced payroll-and-benefits service packages running $35-$55 PEPM, plus a typical one-time implementation fee. See ADP Workforce Now's plans

Two pricing models show up across PEOs generally: a flat per-employee-per-month (PEPM) fee, or a percentage-of-payroll fee that most competitive PEOs set between roughly 3% and 6% of gross payroll. PEPM rewards you for having higher-paid employees (you pay the same fee for a director as for an entry-level hire); percentage-of-payroll scales with wages, so a lean, high-salary team often does better under PEPM while a larger, lower-wage team often does better under a percentage structure. Either way, run the math on your actual payroll, not the sticker rate, before signing.

Leaving a PEO is a real project — plan for it

This is the part sales conversations skip. Exiting a PEO isn't a subscription cancellation; it's a payroll migration. When you leave, your employees come off the PEO's FEIN and go onto (or back onto) your own federal and state tax accounts. That means:

• You need your own active state unemployment (SUI) and withholding accounts in every state you employ people, reactivated or newly filed before the transition date.
• Your SUTA rate can reset once claims history moves to your own account, and it may land higher than the blended rate you had inside the PEO's pooled arrangement — unless your state permits a "successor employer" wage-base transfer.
• Federal wage bases (Social Security, FUTA) and often state wage bases reset on the transfer date unless the move happens exactly at a calendar-year boundary, which is why most PEO exits are timed for January 1 to avoid double-paying payroll taxes on wages already taxed once that year.
• You'll need a new workers' comp policy and a replacement group health plan lined up before coverage under the PEO's master policies lapses.

None of that is a reason to avoid a PEO if you need one — it's a reason to treat the decision as a multi-year commitment, not a month-to-month convenience.

Where each model tends to win

A PEO tends to make sense for a company that's small enough that open-market group health is expensive or hard to get, is hiring across several states and doesn't want to manage each state's registration paperwork, and values workers' comp and compliance being someone else's job. The trade is a higher per-employee-per-month cost and a harder exit later.

Payroll software tends to make sense for a company that already has (or doesn't need) group health outside the platform, operates mostly in one or two states, wants to keep direct control of its own tax and insurance accounts, and is optimizing for the lowest predictable monthly software cost.

If you've already decided the co-employment model fits and want the vendor-level pick, our Justworks review covers plan mechanics and setup in more depth. If you're leaning toward standalone software and want a three-way vendor bake-off, see Gusto vs. Justworks vs. OnPay. And if you're scaling past the smallest headcount tier and want a broader shortlist across both models, our best payroll and HR software for a 50-person scaling team picks are ranked against stated criteria — base price, per-employee fee, included tax filing, multi-state handling, and contract terms — scored before any vendor payout is consulted. For the full picture across both models, start with our graded payroll shortlist.

This article is general information, not tax or legal advice — check with your CPA or an employment attorney before choosing or changing your payroll structure, and before treating any wage-base or FEIN transition as final.

FAQ

Is a PEO the same thing as payroll software? No. A PEO co-employs your staff under its own FEIN and bundles insurance and compliance; payroll software leaves your company as the sole employer of record and automates tax filing and paychecks.

Will switching to a PEO lower my health insurance cost? Often yes for small headcounts, because the PEO pools you into a master policy with better group rates than a standalone small-group quote. The advantage shrinks as your own headcount grows large enough to negotiate competitive rates on the open market.

Can I leave a PEO mid-year without tax problems? You can, but expect wage-base and SUTA-rate resets unless your state allows a successor-employer transfer, and possible double taxation on wages already taxed once that year. Most exits are timed for January 1 to avoid this.

Does payroll software file my payroll taxes for me? Yes — platforms like Gusto and ADP Workforce Now calculate and file federal and state payroll tax deposits and forms — but the tax accounts, the liability, and the FEIN remain your company's, not the software provider's.

Which is cheaper, a PEO or payroll software? Payroll software is materially cheaper per employee in almost every case; the PEO premium pays for pooled insurance access and compliance offload, not just payroll processing. Compare your actual quoted PEPM or percentage-of-payroll fee against your current group health and compliance costs before deciding.