Is a PEO Still Worth It When Your Company Hits 100+ Employees?

Breaking the 100-employee mark is often an occasion where many organizations pause to reassess their HR needs. Should they continue down the path with their PEO, or is it time to change course and perhaps build out an internal HR team?

In truth, there’s no universal point at which a company is supposed to “graduate” from a PEO. Whether you have 100, 200 or 500+ employees matters less than whether your current arrangement still aligns with your operational needs, growth strategy, and long-term goals.

Rather than assuming it’s automatically time to move on once you hit a hundred, the better question is whether your current PEO is still delivering the value, support, and scalability your business needs at this stage of growth.

Here’s what you should be thinking through in terms of your PEO relationship as your SMB surpasses this milestone.

Is the Pricing Structure Still Working in Your Favor?

Every PEO prices its services differently. Some use a percentage of payroll model, whereas others charge a flat, per-employee-per-month (PEPM) rate. When your company grows, these differences in pricing structures can matter significantly.

What may have been cost-effective at 25 employees can become much more expensive as payroll and headcount increase, especially with a percentage of payroll model.

At this stage, it’s important to evaluate:

• Whether your administrative costs are scaling reasonably
• If you’re paying for services you no longer use
• How your pricing compares against the broader market
• Whether a different pricing model would create more predictability as you grow

Many businesses discover at the 100+ employee mark that they haven’t necessarily outgrown the PEO model — they’ve simply outgrown their current pricing structure. Running some numbers to understand your true PEO cost per employee will give you a clearer picture of where things stand.

Are Your Benefits Still Competitive?

Growing companies need to attract and retain quality employees, and one of the key ways they do this is through strong benefits packages. Mid-sized companies don’t often have the resources it takes to compete with large corporations, but with a PEO partnership, they continue to have access to Fortune 500-level benefits offerings. This is an advantage that can remain meaningful well beyond 100 employees.

But benefits should still be evaluated regularly.

As your workforce grows, your company may qualify for additional standalone options that weren’t previously available. At the same time, your employees’ expectations may evolve, especially as competition for talent increases.

Can Your Current PEO Support Your Growth?

A growing company creates growing complexity. Once businesses move beyond 100 employees, they often encounter:

• Multi-state payroll and compliance issues
• Expanded onboarding and training processes
• Increased workers’ compensation exposure
• Greater employee relations demands

Some PEOs scale well alongside growing businesses. Others are built primarily for smaller organizations and may struggle to provide the same level of responsiveness or customization at higher headcounts. That doesn’t mean you’ve outgrown PEOs altogether; it just means you may want to revisit your options. A PEO broker can run a free business review and cost analysis for you to help you assess your options.

Grow with Confidence. Contact The OIS Group for a Free Review

Hitting 100 employees is a milestone, but it doesn’t automatically mean the PEO model no longer fits your business. It just may be your cue to give your current relationship a closer look.

At The OIS Group, we help growing businesses evaluate whether their current PEO, ASO, or in-house HR strategy still aligns with their operational goals, pricing expectations, and long-term growth plans. If your company is scaling and you’re unsure whether your current setup still makes sense, contact us today for a free review.

FAQs on PEO Options for 100+ Employee Companies:

Do companies typically leave their PEO after reaching 100 employees?

Not necessarily. Many companies continue using a PEO well beyond 100 employees because the model still provides value through benefits access, compliance support, payroll administration, and HR infrastructure. More often, businesses outgrow a specific provider or pricing structure — not the PEO model itself.

Is a PEO more expensive once a company grows?

It depends on how the agreement is structured. This is why benchmarking and regular contract reviews become increasingly important as companies scale.

What are the advantages of keeping a PEO at 100+ employees?

For many growing businesses, a PEO can continue providing access to stronger employee benefits, multi-state compliance support, payroll administration, HR technology, and workers’ compensation management without requiring a fully built internal HR department.

Can a company switch PEOs without disrupting employees?

Yes. With proper planning, switching PEOs is a seamless transition and can be done any time of year (not just at contract renewals).