Choosing between hiring a PEO and using payroll software can often be a significant milestone for business owners. It usually means the company is growing, your needs are becoming more sophisticated, and you’re ready to build out more robust benefits or streamline complex back-office tasks.
What you’ll learn
What you’ll learn
Key takeaways
- Professional employer organizations (PEOs) use a co-employment model to handle payroll, tax filing, and benefits administration while sharing employer-related liabilities with your business
- While PEOs offer access to enterprise-level benefits and improved compliance, they often require businesses to use standardized plans and surrender some control over HR processes
- PEOs can be a good fit for businesses with 10-100 employees that need to scale quickly or manage complex compliance across multiple states
The features matter, but to make the right choice, it’s important to consider whether a PEO makes sense for your team’s specific operational workflow and long-term goals.
What is a PEO?
The technical definition of a professional employer organization (PEO) is straightforward: it’s a third-party company that enters into a co-employment relationship with you to manage human resources, payroll, benefits, and compliance.
In this partnership, the PEO becomes the administrative employer of record for tax purposes. While they handle duties like withholding, depositing, and filing payroll taxes, your company retains full control over day-to-day business operations and your employees.
How it fits into your workflow
Even for business owners who are comfortable running payroll, the sheer volume of administrative tasks can become overwhelming as you scale. Balancing retirement plans, sick leave, and varying state benefits requirements is a heavy lift when you’re also trying to run the rest of your business.
Choosing a PEO is one way for employers to outsource these specific responsibilities so you can refocus your energy on your primary operations. Whether a PEO handles your entire HR suite or just specific processes like online payroll, the goal is to reduce the administrative burden that comes with a growing team.
Is a PEO the same as outsourcing HR?
Not quite. While both models help you manage your team, a PEO is fundamentally different from a standard Human Resource Organization (HRO). The difference lies in who is legally responsible for your staff.
The difference is co-employment
When you outsource HR to a standard provider, they effectively act as an external consultant. You remain the sole employer of record. However, a PEO enters into a co-employment partnership with you. In this model:
- Shared liability: The PEO becomes the administrative employer of record, meaning they share in employment-related risks, such as tax liabilities.
- Administrative focus: PEOs excel at relieving the administrative burden of payroll, benefits, and tax filing.
- Scope of service: Unlike some HROs that might handle internal company culture, hiring, or direct employee relations, a PEO typically focuses on the employment adminstration.
What are the benefits of outsourcing payroll to a PEO?
Even with the compromises, PEO for payroll has its advantages, including:
- Enhanced compliance and risk mitigation: Tax laws at the federal, state, and local levels often shift. Outsourcing payroll with a PEO means ensuring compliance and reducing legal risks.
- Access to competitive employee benefits: A PEO pools employees from all its client companies to negotiate better rates for everyone. This means your small business can get access to comprehensive benefits typically reserved for larger organizations.
- Operational efficiency and time savings: By offloading administrative and time-consuming tasks, including payroll frequency and benefits, you free up your schedule and refocus on day-to-day operations.
- Cost reduction: Small businesses often choose a PEO because it offers savings. PEOs help companies cut administrative overhead, lower insurance premiums, and prevent errors.
But co-employment requires a mindset shift if you’re used to being hands-on. Here is what it looks like to hand over the keys:
What control will you lose?
Outsourcing your payroll to a PEO isn’t the right fit for every owner, primarily because it requires a shift in how you manage your back-office administration. There’s specific trade-offs you should consider:
- Standardized systems: PEOs use one-size-fits-all payroll and benefits processes, which means you have less room for customization.
- Vendor selection: The PEO generally decides which health insurance carriers or 401(k) providers to use. This may mean losing access to a preferred local carrier you’ve used for years.
- External reliance: Because of the contractual relationship, you can no longer handle every payroll issue or benefits question entirely in-house; inquiries typically must go through the PEO’s service team
Is payroll software better than a PEO?
The answer isn’t about which is better, but instead it’s about which model fits your business right now and in the future. Payroll software provides the tools to manage payroll and taxes yourself, while a PEO acts as a co-pilot that shares legal responsibility for your workforce.
This table can help you keep track of what to look for:
| Feature | Payroll software (DIY) | PEO (Co-employment) |
| Legal model | You retain full liability | Shared legal/tax liability |
| Benefits | You choose your own providers | Enterprise-level/Master plans |
| Control | Full control over HR policies | Standardized/PEO-led plans |
| Cost structure | Base fee + per-employee fee | Often % of gross payroll |
| Best for | Small, stable, or budget-conscious | Multi-state, complex compliance |
When payroll software is the better choice
Payroll software is often the right move if you want to maintain full control over your health insurance brokers and 401(k) providers without being locked into a PEO’s “master” plans. It’s significantly more affordable for growing teams on a budget, and if you have fewer than five employees or operate in a single state, a payroll software’s full product suite can help you with all the HR to-dos you need to handle.
When to consider a PEO
A PEO might be the better move when you need to offer Fortune 500-level health insurance to compete for talent, or if multi-state compliance has become a major source of stress. It allows you to essentially offload HR administration entirely, so you can focus back on your business growth rather than tracking workers’ comp claims or unemployment insurance filings.
Understanding the cost of a PEO
For many growing businesses, a PEO is a strategic investment. However, because the pricing models vary, it’s important to understand the different ways you might be billed:
- Flat fees: Many PEOs charge a flat fee per employee, per year, which typically ranges from $750 to $1,500. For a business with 15 employees, this represents an annual investment of roughly $11,250 to $22,500 in fees.
- Percentage of payroll: Alternatively, some providers charge a percentage of your total gross payroll. This often ranges between 15% and 18% of employee salary plus social costs, depending on the complexity of the requirements and the country of operation.
- Administrative costs: Be prepared for a one-time implementation fee that can start around $2,500 to add new employees to the system.
Remember, this is just a ballpark. The takeaway is that the numbers can differ depending on the vendor and how you choose to work with them.
While these fees can initially seem high, it’s important to weigh them against your current DIY costs. A PEO can sometimes offset its price tag by:
- Reducing insurance premiums through master policies.
- Eliminating separate software subscriptions for payroll or HR tools.
- Preventing costly filing errors and administrative overhead.
Simple with support when you need it
“I definitely recommend OnPay, it’s very easy to use and offers all of the features of other top payroll providers at a much better price, and they have excellent support — though it’s rarely needed due to the ease of use.”
— Lara Bojarsky, Aym Alliance Inc.
How to decide: Is a PEO right for you?
When deciding if a PEO fits your business needs, weigh your specific operational goals against the benefits and trade-offs of co-employment.
A PEO could be worth a look if:
- You are expanding into new states with complex, varied compliance rules
- You lack a dedicated HR staff, or your existing team needs high-level strategic support from a people and culture department
- You operate in a high-risk industry where shared liability offers peace of mind
If your operation doesn’t require this level of intense strategic support, payroll software can often provide the automation and compliance help you need without the complexity (or cost) of a full co-employment model.
If you do decide to do more research on PEOs, be sure to interview several providers. Check their certifications and ask detailed questions about their HR support model to ensure they align with your company culture.
Bottom line: Payroll is an important part of most businesses
Deciding to outsource payroll processing through a PEO can make sense for some growing companies, but it often requires giving up a level of control that many founders find uncomfortable. If you’re looking for a way to balance automation, compliance, and flexibility — without having to move to a co-employment model — OnPay can help you keep things running smoothly, and you can try it for 30 days to see if it’s the fit you’re looking for.
Take a tour to see how easy payroll can be.
Jon Davis is the Sr. Content Marketing Manager at OnPay. He has over 15 years of experience writing for small and growing businesses. Jon lives and works in Atlanta.