PEO vs. payroll company

Quick comparison

The 30-second version, side by side:

When payroll software is enough

You almost certainly want payroll software, not a PEO, if:

• You have under 5 W-2 employees and no plans to grow quickly.
• You operate in one state.
• You're not offering group health benefits and have no near-term plans to.
• Your workers comp class is low-rate (clerical, professional services) and your business is small enough that standalone comp is affordable.
• You don't need HR support beyond Google searches.
• You're price-sensitive on monthly admin overhead and willing to invest your own time in admin tasks.

Solid payroll-only options for this stage: Gusto, QuickBooks Payroll, OnPay, Patriot Payroll, ADP RUN. None of them will sell you a PEO, and most of them have referral relationships with PEOs when you outgrow them.

When a PEO may make sense

The case for a PEO gets stronger as one or more of these become true. Score yourself — three or more is the threshold where running real quotes is worth it:

Notice that none of these triggers are "the PEO is cheaper than payroll software." It almost never is on a pure cost basis. The case is about what you get for the higher admin fee.

Payroll taxes and administration

Both options handle the same payroll-tax mechanics: withholding, remittance, quarterly filings (941, state withholding), annual filings (940, W-2s), and tax-notice responses. The differences:

• Liability transfer — only an IRS Certified PEO (CPEO) actually takes on federal employment tax liability under the 2014 SBEA. Standard payroll software does not transfer liability — if a notice lands wrong, you're still on the hook.
• Multi-state complexity — payroll software handles multi-state at a price; PEOs include it (usually) and handle SUTA-rate management, state-by-state filings, and reciprocal-state withholding centrally.
• Tax-notice handling — payroll software responds to notices but often passes resolution back to you. PEOs typically handle resolution end-to-end as the legal employer of record.
• Audit defense — PEOs maintain documentation for audits; you sign one document and they handle the rest.

Workers comp and risk management

This is often the biggest functional difference:

• Payroll software doesn't handle workers comp at all. You buy a standalone policy through an insurance broker. The premium reflects your specific business's experience modifier and class codes at retail pricing.
• PEO places you on their master workers comp policy, often unlocking pool pricing. Many include claims-management support, OSHA-log assistance, and safety-program templates. For high-mod or high-rate businesses, this alone can save 15–40% on comp.
• For low-mod, low-rate businesses, standalone comp through a broker may price equivalently or better — pool pricing is least valuable when your individual experience is already favorable.

Employee benefits and retention

The benefits gap is structural and widens at small group sizes:

• Payroll software may integrate with benefits brokers but doesn't pool you with other employers. You get small-group rates determined by your size, state, and the carriers' rating tables. For groups under 50, this can be 30–60% more expensive per employee than large-group rates.
• PEO aggregates you with their full client base — tens of thousands of employees pooled into a single rated group. The pricing approaches large-group economics. Plan choice and carrier networks vary by PEO.
• Retention impact — for industries where benefits drive retention (trades, hospitality, restaurants), the difference between offering competitive group health and not offering it at all often shows up in turnover costs that dwarf the PEO admin fee.

HR compliance support

The most under-appreciated difference:

• Payroll software typically offers add-on HR libraries (templates, articles, basic chat support). It's not personalized; you do the legwork.
• PEO includes an assigned HR advisor (or a pool of them) you can call for situational guidance: "An employee just resigned — what do I need to do in California?" "Should I classify this person as 1099 or W-2?" "How do I handle this performance issue?" Their answers are general (not legal advice), but they're personalized.
• Documentation — PEOs maintain employee handbooks, FLSA classifications, onboarding paperwork, terminations, and federal reporting (EEO-1, ACA 1094/1095, OSHA 300/300A) as part of the engagement.

Cost comparison

Pure-numbers comparison for a 25-employee Home Services business at $55k average wage, single-state, currently offering basic group health:

• Payroll software path: $80/month base + $10/employee = $3,360/year. Plus $15k workers comp at retail. Plus group health at small-group rates (let's say $400/employee/month employer cost = $120k/year). Plus 5 hours/week of owner/admin time on HR/compliance/benefits administration. Total visible cash: ~$138k. Plus the time.
• PEO path: $80 PEPM admin = $24k/year. Workers comp at PEO pool rate, often $11k–$13k. Group health at pool rates often $325/employee/month employer cost = $97k/year. Plus negligible owner/admin time on those functions. Total visible cash: ~$135k. Time savings on top.

This example is favorable to the PEO. Many examples come out the other way — the math depends on your specific comp class, state, current benefits, and time valuation. Get both quotes before deciding.

Decision checklist

Run through this quickly. Each "yes" on the PEO side is a point. Three or more = run real quotes.

• Do you have 10+ W-2 employees? (PEO favorable)
• Are you in 2+ states? (PEO favorable)
• Is workers comp 5%+ of payroll? (PEO favorable)
• Do you want to offer group health? (PEO favorable)
• Do you spend 8+ hours/week on people-admin? (PEO favorable)
• Is your business under 5 employees, single-state, no benefits, low comp? (Payroll software favorable)
• Are you growth-stage expecting to triple in 18 months? (Either works — many start with payroll and graduate)

If you scored 3+ on the PEO side, run actual quotes. If you scored 2 or fewer, stay with payroll software for now and revisit annually.

Industry-specific takes

The math swings hardest in industries where workers comp, benefits, or compliance is already a real line item. Industry-specific framings:

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