// straight answers

PEO vs payroll service:
what's the actual difference?

People use these terms interchangeably. They aren't interchangeable. Here's what each one does, what co-employment means in plain English, and how to tell which one you need.

By Victor Difusco · Underwriter, Cornerstone PEO

01

What a payroll service does

A payroll service processes payroll. That's the job: calculate pay, run direct deposits, file payroll taxes, issue W-2s.

You stay the employer of record for everything. Workers' comp, benefits, HR compliance: still yours to arrange, still your liability. A good payroll service does its one thing well, and for plenty of businesses that's the whole answer.

02

What a PEO does

A PEO does payroll too. Then it keeps going. Through co-employment, the PEO becomes the employer of record for tax and insurance purposes:

The PEO takes on

  • Payroll and payroll taxes: processing, filings, W-2s
  • Workers' comp: coverage, claims, audits, pay-as-you-go
  • Benefits: health, dental, vision, 401(k) at group scale
  • HR compliance: hiring paperwork, posters, handbooks, unemployment claims

You keep

  • Running the business: hiring, firing, day-to-day management
  • Your culture, your customers, your product
  • Every decision about what the company does

The PEO handles what the company files. You keep the steering wheel.

03

Co-employment, in plain English

Co-employment splits the employer role in two. You are the worksite employer: you direct the work, set the culture, make the calls. The PEO is the administrative employer: it shows up on the tax filings and the comp policy.

Your employees see one paycheck and one benefits package. Nothing about their day-to-day changes, except the paperwork gets professional.

04

When payroll-only is enough

Honest answer first, because most PEO salespeople won't give it to you:

a.

A handful of employees, one state.

Low-risk work, straightforward comp, benefits not on the roadmap yet, nobody drowning. A good payroll service is cheaper and it's all you need.

b.

Your comp and benefits already work.

If the renewal is fair, the audit is clean, and the broker earns their keep, don't fix what isn't broken. Buy the stack when you need it, not before.

05

When the PEO stack earns it

The math flips when admin starts costing real money:

a.

Comp renewals climbing for no good reason.

Wrong class codes, unsplit payroll, stale loss data. The inputs nobody checked. A PEO reprices the whole stack instead of the line.

b.

Hiring across state lines.

Every state has its own withholding, comp, and HR rules. That's where DIY payroll starts creating real liability.

c.

Benefits you can't buy at your size.

Nine employees don't get group buying power. A PEO's plans do: same coverage at rates that beat small-group.

d.

An owner spending nights on payroll.

Nobody starts a business to run payroll at midnight. Add up the penalties, the overpriced comp, and your own hours at midnight. The PEO usually costs less than the alternative.

The honest cost note. A PEO typically charges a per-employee-per-month admin fee or a percentage of payroll. The question is never "does it cost money." It's whether it costs less than the alternative: penalties, overpriced comp, and your own hours doing admin at midnight.

06

Still not sure which one you are?

Describe the business in two sentences. I'll tell you straight which lane fits, even if the answer is "just get a payroll service."

Victor Difusco · Underwriter, Cornerstone PEO · 1 S Main St, Medford, NJ 08055