A payroll service calculates pay, files returns and moves money; you remain the employer in every legal sense. A PEO co-employs your staff, layering benefits, workers compensation and HR administration on top of payroll. The price difference is large and so is the liability difference: the IRS treats the arrangements differently, and in the standard payroll-provider setup the employer remains on the hook for every tax dollar even when the provider fails. This page separates the two products and the liability rules, drawing on IRS guidance; plan documents and service agreements control, and nothing here is legal or tax advice.
What a payroll provider does
A payroll service provider or reporting agent runs the calculations, files employment tax returns under your EIN and remits withholdings from your account. It is an administration layer, not an employment one: your company remains the sole employer, holds the state registrations and owns every compliance outcome. The IRS is unambiguous about where responsibility sits, stating that the employer is ultimately responsible for the deposit and payment of federal tax liabilities, and it warns that there have been prosecutions of companies that, acting under the appearance of a payroll service provider, stole funds intended for employment taxes. That warning is the reason the IRS advises employers to enrol in EFTPS themselves and watch the deposits actually land.
What a PEO adds
A PEO takes co-employment of your workforce: it becomes the employer of record for payroll and benefits administration while you direct the day-to-day work. On top of payroll it brings master-policy workers compensation, access to larger-group health plans, HR support and multi-state tax administration. The economics differ accordingly: payroll services price as a modest per-run or per-employee software fee, while PEOs charge either a flat amount per employee per month or a share of total payroll, with the index on this site recording what vendors advertise. Buying a PEO for payroll alone overpays badly; buying payroll software when what you need is benefits leverage and compliance bandwidth underpays and leaves the gap on your desk.
Liability: the part that actually differs
The IRS third-party arrangement rules draw the line clearly. With a payroll service provider or reporting agent, returns go in under the client's EIN and the employer, not the provider, remains liable for timely filing and payment. A certified professional employer organization is the exception: a CPEO files aggregate returns under its own EIN and is generally solely liable for the customer's employment taxes on remuneration it pays to worksite employees, though both parties can be liable for non-worksite remuneration. An uncertified PEO sits between the two, without the statutory liability shift. If tax risk transfer is part of why you are buying, certification is the feature that delivers it, and the IRS publishes the list of certified organizations to check a vendor against.
Choosing by headcount and need
A stable single-state team with benefits already sorted usually needs only payroll software or a payroll service, at software prices, plus the discipline of monitoring its own EFTPS deposits. A growing multi-state employer buying health insurance in small-group markets is the classic PEO customer: the co-employment pool buys better benefits and the administration bundle replaces headcount you would otherwise hire. The decision reverses at scale, when in-house HR plus a payroll provider becomes cheaper than per-employee PEO fees. And if the hire is in another country entirely, neither product fits: that is an employer of record purchase, priced and compared elsewhere on this site.
Questions people ask about peo vs payroll
If my payroll company fails to pay the IRS, who owes the money?
You do. The IRS holds the employer ultimately responsible for federal tax deposits even when a provider was hired to make them, and notices go to your address of record. Enrolling in EFTPS to watch deposits arrive is the IRS's own recommended safeguard.
Does a PEO take over tax liability?
Only a certified PEO does, and only partly: a CPEO files under its own EIN and is generally solely liable for employment taxes on worksite employee wages. Uncertified PEOs and payroll providers leave liability with you, whatever the sales material implies.
Is a PEO just expensive payroll?
No. The fee buys co-employment: pooled workers compensation, larger-group benefits access and HR administration. If you only need calculations and filings, a payroll service does that at a fraction of the cost; the products overlap on payroll and diverge everywhere else.
Can I use a payroll provider and still get PEO-style benefits?
Partly. Benefits brokers and association plans can improve small-group access without co-employment, and some payroll platforms resell benefits administration. The pooled workers compensation and the CPEO tax liability shift are the pieces you cannot replicate without the PEO structure.