Payroll software is a tool; a payroll service provider (PSP) is a company or other party that performs payroll tasks under an arrangement with an employer. An IRS-authorized agent may also have authority to file or pay certain employment taxes. None of those labels automatically means the provider handles 401(k) contributions: retirement-plan remittances are a separate workflow, and employers generally remain responsible for getting withheld contributions to the plan promptly.
“Third-party contribution agent” is not a defined category in the IRS payroll arrangements described here. If you mean a vendor that sends employee retirement contributions to a plan, evaluate that service separately from federal payroll-tax processing.
What’s the difference between payroll software and a payroll service provider?
Payroll software
Software helps calculate wages, deductions, and payroll records. The software itself is not an IRS tax-agent category, and using a platform does not establish which party prepares or files returns, makes deposits, or handles notices. Those responsibilities depend on the service agreement and any applicable IRS authorization.
Payroll service provider
A PSP performs contracted payroll tasks. Depending on the arrangement, it may prepare paychecks; prepare Forms 940 and 941 using the employer’s EIN; file returns signed by the employer; make federal tax deposits and payments; and prepare Forms W-2 and W-3. The actual scope varies by agreement. See the IRS explanation of payroll service providers and reporting agents.
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Which IRS third-party arrangements are different?
“Payroll company” can describe different legal and operational arrangements. The authorization, EIN used, filing authority, and allocation of responsibility are not the same in each one.
| Arrangement | Authorization or basis | What it may do | EIN and responsibility |
|---|---|---|---|
| Payroll service provider (PSP) | Contract; a PSP is not, just by that label, an IRS-authorized agent | May perform contracted tasks such as preparing payroll, returns, deposits, and wage statements | May use the employer’s EIN for returns. The employer generally remains responsible for employment taxes. |
| Reporting agent | Employer authorizes the agent using Form 8655 | May perform PSP tasks and may have authority to sign and electronically file certain returns | Generally uses the employer’s EIN; the employer is not relieved of employment tax obligations or liability. |
| Section 3504 agent | Employer appointment through Form 2678 and IRS authorization | Performs specified withholding, reporting, and payment functions | May file aggregate returns using the agent’s EIN. The IRS describes joint and several liability; the employer remains subject to applicable law and penalties. |
| Certified professional employer organization (CPEO) | Separate IRS certification and a CPEO contract; Form 8973 is associated with the relationship | Typically pays wages under the contract and assumes federal employment tax duties for covered wages, subject to applicable rules and contract facts | The arrangement has distinct rules for covered wages and liability; do not assume it is equivalent to a PSP or reporting agent. |
The IRS third-party arrangement chart compares filing authority and EIN use. The IRS overview of outsourcing payroll explains the arrangements and employer responsibilities.
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Who is responsible if a payroll company does not pay the taxes?
For a PSP or reporting agent, the employer is not relieved of its employment tax obligations or liability because it hired a provider. The IRS states: “An employer’s use of either a PSP or a reporting agent does not relieve the employer of its employment tax obligations or liability for employment taxes.” A contract may define remedies between the employer and provider, but it does not by itself erase the employer’s obligations to the government.
Section 3504 agents and CPEOs have distinct rules, so do not apply the PSP rule mechanically to every arrangement. Confirm the actual appointment or contract, the covered wages and duties, and the applicable IRS arrangement.
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How to keep visibility into deposits
The IRS recommends that employers enroll in EFTPS and make sure their third-party provider uses it for tax deposits. EFTPS gives employers access to payment history, which helps them check whether deposits were made rather than relying only on a provider’s report. The IRS also recommends verifying the provider’s work and responding promptly to account issues. See its guidance on choosing and monitoring payroll service providers.
Does a payroll company handle 401(k) contributions?
Not necessarily. Federal employment-tax deposits and employee retirement-plan contributions are different obligations. A payroll vendor might connect payroll deductions to plan records or remit contributions, but do not infer that it does so because it processes payroll taxes. The agreement and plan documents determine the operational roles; the plan’s recordkeeper or trustee is not automatically the payroll tax agent.
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Who must send employee deductions to the retirement plan?
For an employer-sponsored retirement plan, the employer is the plan sponsor and has ERISA responsibilities. When employees contribute through payroll withholding, the employer is responsible for forwarding those contributions to the plan as soon as possible, according to the Department of Labor’s small-business employer guidance.
Timing rules for depositing contributions
- Small-plan safe harbor: For a plan with fewer than 100 participants, contributions deposited no later than the seventh business day after payday are treated as timely under the DOL safe harbor.
- General rule and outside limit: Contributions must be deposited as soon as reasonably possible to segregate them from company assets. The DOL’s 2021 fiduciary booklet describes a general outside limit of the fifteenth business day of the month following payday, but employers must deposit sooner when reasonably possible.
These are not instructions to wait until the last permissible day. The DOL explains the timing standards in Meeting Your Fiduciary Responsibilities.
Does hiring a retirement-plan service provider transfer fiduciary duties?
Hiring a provider does not automatically remove the employer’s fiduciary duties. Under the DOL’s explanation of who may be a plan fiduciary, fiduciary status depends on functions performed, including discretion or control over plan management or assets. Employers should understand and monitor the provider relationship.
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A payroll deduction IRA arrangement can involve a more limited employer role when the employer’s involvement stays minimal. Under the DOL’s description, that means the employer does not negotiate special terms, influence investment choices, or receive compensation beyond actual forwarding costs. See Payroll Deduction IRAs for Small Businesses.
What should you check before outsourcing payroll?
Ask the provider to describe the workflow in writing, then compare the answer with your contract and authorization documents.
- Tasks: Who calculates wages and withholding, prepares and files returns, makes deposits, produces W-2/W-3 forms, and responds to agency notices?
- Arrangement: Is the provider a PSP, reporting agent, section 3504 agent, or CPEO? Which authorization or contract applies—Form 8655, Form 2678, or a CPEO contract and related Form 8973?
- EIN and filings: Whose EIN appears on returns and deposits? Are returns filed separately or in aggregate?
- Verification: What reports, account access, and payment records let you confirm filings and deposits? Can you review payment history in EFTPS?
- Exceptions: Who investigates a missed deposit, incorrect payroll data, late return, or agency notice, and how are corrections escalated?
What should you check for retirement contributions?
Evaluate the plan-remittance process separately from payroll-tax outsourcing. Confirm how deductions move from payroll to plan records, when funds are transmitted, how totals are reconciled, how errors are corrected, and how hires and terminations are handled. Check fees and the contract’s assignment of each operational task, then compare those terms with the plan documents. A payroll tax provider is not automatically the plan’s recordkeeper, trustee, or contribution remitter.
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