An employee leasing agreement is the contract between your business and a professional employer organization (PEO) that creates a co-employment relationship: the PEO becomes the employer of record for payroll, tax filings, and insurance, while you keep day-to-day control over your workforce. The single most important question to answer before signing is whether the PEO is certified by the IRS, because a certified PEO (CPEO) is treated as the sole employer for federal employment tax purposes and a non-certified one is not. That distinction decides whether you stay on the hook if the PEO collects your payroll taxes and fails to remit them.1Office of the Law Revision Counsel. 26 USC 3511 – Certified Professional Employer Organizations
How Responsibility Is Split Under Co-Employment
The IRS applies common-law rules to decide who counts as an employer, focusing on who has the right to control how work gets done.2Internal Revenue Service. Employee (Common-Law Employee) In a PEO arrangement, both sides share the employer role but handle different pieces. The PEO processes payroll, withholds and deposits federal and state employment taxes, files quarterly and annual returns, and issues W-2s at year-end.3Internal Revenue Service. Third Party Payer Arrangements – Professional Employer Organizations You keep operational control: directing daily work, managing performance, setting schedules, and making hiring and firing decisions.
Liability follows control. Workplace safety obligations stay with the party running the work environment, which is almost always the client company, and that duty does not transfer to the PEO because the PEO handles the workers’ compensation claim afterward.4Occupational Safety and Health Administration. Worker Rights and Protections
Clauses the Agreement Has to Cover
A client service agreement should spell out, in specifics, who does what for every financial and administrative obligation.3Internal Revenue Service. Third Party Payer Arrangements – Professional Employer Organizations Read the contract for these areas before you sign.
Tax Filing and Deposits
The PEO typically files aggregate Forms 941 (quarterly federal tax returns) and Form 940 (annual federal unemployment tax return) under its own EIN on behalf of client companies. Certified PEOs must file these electronically and attach Schedule R to allocate wages and taxes by client.5Internal Revenue Service. Instructions for Form 941 (03/2026) The agreement should identify which forms the PEO handles, under whose EIN, and the deposit schedule the PEO will follow.
Benefits Administration
The contract should say whether the PEO provides health insurance, retirement plans, and other benefits through its own master policies, or whether you keep your existing plans. That decision drives the compliance obligations discussed further down.
Termination Provisions
Look for a defined notice period (commonly 30 to 60 days), a documented process for moving employees back to your payroll, and clear language on how pending workers’ compensation claims are handled after the agreement ends.
Indemnification
Most agreements include cross-indemnification. The PEO typically indemnifies the client for failures in tax filing or payroll processing, and the client indemnifies the PEO for claims tied to workplace conditions, hiring decisions, and operational management. This section defines who pays when something goes wrong, so read it line by line.
Tail Coverage on Workers’ Compensation
When the relationship ends, workers’ compensation claims from injuries that happened during the agreement do not disappear. If the PEO’s workers’ compensation coverage is written on a claims-made basis, the contract needs to address tail coverage, meaning an extended reporting period that lets claims be filed after the policy ends. Without it, an injury that occurred under the PEO’s policy but was reported late could leave you uncovered. The agreement should specify how long tail coverage runs and who pays for it.
Pricing Model
PEOs generally charge one of two ways. A percentage-of-payroll fee usually runs between 2% and 12% depending on the services included and your workforce’s risk profile. A flat per-employee-per-month fee gives more cost predictability as wages rise. Either way, the administrative fee is separate from pass-through costs like workers’ compensation premiums and health insurance contributions, and the agreement should clearly distinguish the two so you can audit what you are paying for overhead versus coverage.
Certified PEO or Non-Certified: The Question That Matters Most
The IRS runs a voluntary certification program for PEOs under Section 7705 of the Internal Revenue Code, and the difference is not cosmetic.6Internal Revenue Service. Certified Professional Employer Organization Under federal law, a CPEO is treated as the sole employer for federal employment tax purposes with respect to wages it pays to worksite employees.1Office of the Law Revision Counsel. 26 USC 3511 – Certified Professional Employer Organizations If a CPEO collects your payroll taxes and fails to remit them, you are not liable for those unpaid taxes. With a non-certified PEO you have no such protection, and the IRS can pursue you for the full amount even if you already paid the PEO.
To earn and keep certification, a CPEO has to meet ongoing requirements under Section 7705:7Office of the Law Revision Counsel. 26 USC 7705 – Certified Professional Employer Organizations
- Post a surety bond for federal employment taxes equal to the greater of 5% of prior-year tax liability (capped at $1,000,000) or $50,000.
- Get an annual independent CPA opinion on financial statements under generally accepted accounting principles.
- Provide a quarterly certification by a responsible individual, under penalty of perjury, that all required federal employment taxes were withheld and deposited, backed by an examination-level CPA attestation.
The IRS publishes the list of active CPEOs and updates it by the 15th of the first month of each calendar quarter.8Internal Revenue Service. CPEO Public Listings Before signing, check the list. If a PEO claims certification but is not on it, that is a deal-breaker.
The Wage Base Advantage of a CPEO
Federal regulations treat a CPEO and its customer as a successor and predecessor employer when they enter into a service contract.9eCFR. 26 CFR 31.3511-1 – Certified Professional Employer Organizations Wages already paid to an employee earlier in the calendar year count toward the annual FUTA wage base ($7,000) and the Social Security wage base, so those caps do not restart when the CPEO takes over payroll.10Office of the Law Revision Counsel. 26 USC 3306 – Definitions With a non-certified PEO, a mid-year transition can trigger a wage base restart, and you end up paying FUTA and Social Security taxes twice on the same wages up to the cap. Timing the transition for January 1 avoids the problem; using a CPEO eliminates it regardless of timing.
What to Have Ready Before You Negotiate
Showing up without the right records slows the transition and creates errors that are expensive to unwind. Pull the following together first:
- Your Federal Employer Identification Number and your state unemployment insurance account number, with your current state unemployment tax rate.
- A complete employee census: full names, Social Security numbers, dates of hire, job titles, and current annual wages for every employee.
- Workers’ compensation details, including your current policy, your Experience Modification Rate, and the class codes assigned to each role. A miscoded role, such as a warehouse worker labeled under a clerical code, leads to inaccurate premiums and audit problems.
- Current benefit plan documents: health insurance policies, retirement plan summaries, and any employment practices liability insurance. Knowing your existing coverage lets you evaluate whether the PEO’s master policies improve on it or leave gaps.
Roughly 35 states require PEOs to register or hold a license before operating, and those requirements typically include posting a surety bond and submitting audited financial statements. Your state’s Department of Labor or Secretary of State office is the right starting point to verify registration. If a PEO is not registered in a state that requires it, walk away.
Benefit Plan Compliance the Contract Has to Address
Access to group health insurance and retirement plans is one of the main reasons small businesses use a PEO, and each of those benefits carries regulatory obligations the agreement needs to allocate.
Health Insurance and MEWA Rules
When a PEO offers a health plan covering employees of multiple client companies, the plan is classified as a multiple employer welfare arrangement (MEWA) under federal law.11Office of the Law Revision Counsel. 29 USC 1002 – Definitions MEWAs are subject to state insurance regulation on top of ERISA, and the PEO must file Form M-1 with the Department of Labor annually. The penalty for missing the M-1 deadline is $1,992 per day as of 2026. Your agreement should confirm that the PEO handles those filings and that the health plan is fully insured through a licensed carrier, since self-funded MEWAs face heavier state regulatory scrutiny.
Retirement Plans and Fiduciary Roles
If the PEO sponsors a 401(k) or other retirement plan, ERISA’s fiduciary rules govern how it is managed. The question is how much fiduciary responsibility the PEO takes on versus what stays with you. Some PEOs appoint a discretionary investment manager who takes full responsibility for selecting and monitoring plan investments, which shifts fiduciary liability for those decisions away from the client. Others use an advisory model where the PEO recommends and the client decides, keeping the liability with you. The agreement should state which fiduciary model applies and whether the PEO acts as the plan’s named administrator for compliance and reporting.
FMLA and ACA Obligations Don’t Disappear
Co-employment does not simplify federal compliance the way business owners often assume. Two laws in particular look through the PEO relationship.
Under the Family and Medical Leave Act, employees in a joint employment arrangement are counted by both the PEO and the client company when determining whether each entity meets the 50-employee coverage threshold.12U.S. Department of Labor. Fact Sheet 28N: Joint Employment and Primary and Secondary Employer Responsibilities Under the Family and Medical Leave Act (FMLA) A business with 35 employees of its own might assume FMLA does not apply, but if the PEO’s total headcount across all its clients pushes the PEO over 50, the employee may still be eligible. The agreement should identify which entity is the primary employer for FMLA notice and recordkeeping.
Under the Affordable Care Act, the employer shared responsibility provisions apply to applicable large employers with 50 or more full-time equivalent employees. The PEO typically prepares and distributes Forms 1095-C and files Forms 1094-C with the IRS, but the underlying legal duty to offer qualifying coverage stays with the client as the common-law employer. If the PEO files inaccurately, the IRS penalty assessments land on you. The agreement should require accurate and timely ACA information reporting and include an indemnification provision covering penalties caused by PEO filing errors.
What Happens If the Tax Work Goes Wrong
The IRS penalty structure for late federal employment tax deposits escalates quickly, reaching 10% for deposits made through unauthorized methods and up to 15% for amounts still unpaid after an IRS notice, on top of interest from the original due date.13Internal Revenue Service. 20.1.4 Failure to Deposit Penalty When a non-certified PEO handles your deposits, your company remains jointly liable, so a missed deadline or misapplied fund on the PEO’s side becomes your penalty.
This is the strongest single argument for a CPEO. Under Section 3511, the CPEO is treated as the employer for federal employment tax purposes, and the client is not liable for taxes the CPEO fails to remit.1Office of the Law Revision Counsel. 26 USC 3511 – Certified Professional Employer Organizations The quarterly CPA attestation required for CPEOs adds a second layer of protection by surfacing deposit failures within weeks rather than months.
Timing the Transition
Once both parties sign the master service agreement, the PEO begins integrating your employee data into its payroll system, which typically takes two to four weeks. Most PEOs prefer to start at the beginning of a calendar quarter so that the prior quarter’s returns are filed cleanly under your EIN and the new quarter starts under the PEO’s EIN.
During the transition, the PEO registers as the reporting entity with your state’s unemployment agency and takes over filing. You should receive confirmation notices from the state verifying the transfer. Before the first payroll run, verify that federal tax deposits are being made through EFTPS under the correct taxpayer identification number, because a misrouted deposit early in the relationship is a common setup error that triggers unnecessary penalty notices.14Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System
If you are moving to a non-certified PEO mid-year, plan around the wage base restart. Federal and state unemployment tax wage bases restart at zero for each employee, so you effectively pay FUTA taxes on the first $7,000 of wages again even if those wages were already taxed earlier in the year under your own EIN.10Office of the Law Revision Counsel. 26 USC 3306 – Definitions For a company with 50 employees, the duplicate exposure adds up fast. A CPEO avoids it because federal regulations grant automatic successor-employer status and let prior wage credits carry over.9eCFR. 26 CFR 31.3511-1 – Certified Professional Employer Organizations If a CPEO is not an option, time the transition for January 1.