Justworks is a Professional Employer Organization (PEO) that enters a co-employment relationship with your business. Gusto is payroll and HR software that keeps you as the sole employer. Both handle payroll, but they operate on fundamentally different models — and choosing the wrong one at the wrong stage of your business can cost you time, money, and talent. Here’s how to tell which one actually fits where you are right now.
What Is the Core Difference Between Justworks and Gusto?
The short answer: Justworks is infrastructure. Gusto is software. That distinction sounds simple, but it changes everything from your liability exposure to the quality of benefits you can offer employees.
When you join Justworks, you enter a co-employment arrangement. Justworks becomes the employer of record for tax and benefits purposes, pools your employees with thousands of other small businesses, and uses that collective size to negotiate Fortune 500-level health insurance, 401(k) plans, and workers’ comp coverage. You still run your business and manage your team day-to-day — but Justworks shoulders significant compliance and administrative risk alongside you.
Gusto works differently. You remain the sole employer. Gusto automates payroll runs, files payroll taxes, and offers a self-service HR portal. It’s genuinely excellent software — but it’s a tool you use, not a partner that shares employer responsibility with you. According to NAPEO, PEO clients grow 7–9% faster and have 10–14% lower employee turnover than businesses that go it alone. That data reflects the full co-employment model — not software.
Comparing PEOs is easier when you know your baseline cost. Our free calculator shows what a PEO would cost for your company in 60 seconds — no call needed.
Justworks vs Gusto: Feature-by-Feature Comparison
Before we dig into which platform suits which business, here’s a side-by-side look at how they stack up on the features that matter most to small and mid-size employers.
| Feature | Justworks (PEO) | Gusto (Payroll Software) |
|---|---|---|
| Model | Co-employment (PEO) | SaaS payroll software |
| Payroll Processing | ✅ Full service | ✅ Full service |
| Payroll Tax Filing | ✅ Included | ✅ Included |
| Health Insurance Access | ✅ Group rates via PEO pool | ⚠️ Open market (small business rates) |
| 401(k) | ✅ Pooled plan, lower fees | ✅ Available, standard rates |
| Workers’ Comp | ✅ Included in PEO pool | ⚠️ Partner integration only |
| HR Compliance Support | ✅ Shared liability, HR team | ⚠️ Guidance only, no shared liability |
| EPLI / Employment Practices Liability | ✅ Included | ❌ Not included |
| Dedicated HR Support | ✅ Named HR specialists | ⚠️ Chat/email support only |
| IRS Certified | ✅ CPEO certified | ❌ Not a PEO |
| Pricing Model | Per employee/month ($59–$99+) | Base + per employee ($40–$80+/mo) |
| Best For | 5–200 employees, growth stage | 1–50 employees, early stage |
How Does Justworks Work as a PEO?
Justworks is an IRS-certified Certified PEO (CPEO), which matters for tax purposes. As a CPEO, Justworks takes on federal employment tax liability — something standard payroll software can’t do. When you join, your employees technically become co-employed by both your company and Justworks.
In practice, that means Justworks can offer your 15-person startup access to the same Aetna or United Healthcare group rates as a 5,000-person corporation. A 15-person company shopping for health insurance on its own gets priced as a 15-person company. Through Justworks’ PEO pool, you get priced as part of a much larger group. That difference in premium alone can offset a significant portion of Justworks’ monthly fee.
Justworks also provides employment practices liability insurance (EPLI), which protects against wrongful termination claims, harassment claims, and discrimination lawsuits — a coverage most small businesses skip because it’s expensive to buy standalone. When your HR decisions are shared with a co-employer, the legal exposure is also shared.
If you want a deeper look at how Justworks stacks up against other full-service PEOs, see our breakdown in Comparing PEO, Gusto, and Justworks: Which Is Best?
How Does Gusto Work as Payroll Software?
Gusto is genuinely good at what it does. The interface is clean, onboarding new hires is fast, and it automates federal, state, and local payroll tax filings in all 50 states. For a founder running a 5-person team who needs payroll handled without complexity, Gusto is often the right call.
The key limitation is that Gusto’s compliance tools are advisory, not protective. Gusto will remind you about labor law changes and flag potential issues — but if you get hit with a misclassification audit from the Department of Labor or a discrimination claim from a former employee, that’s entirely your liability. Gusto doesn’t share it.
Gusto’s health insurance marketplace connects you to carriers, but your premium is based on your own employee pool. For a small team with any older or health-challenged employees, those rates can be brutal. You’re not benefiting from anyone else’s risk pool the way you would inside a PEO.
Which Business Stage Fits Each Platform?
Choose Gusto If…
- You have fewer than 10 employees and your primary need is clean, automated payroll
- Your team is healthy and relatively young, so individual health insurance rates are manageable
- You’re pre-revenue or in very early stages and every dollar of overhead is scrutinized
- You have no full-time HR person and just need basic self-service tools
- You’re comfortable taking on employment compliance risk yourself or have outside counsel
Choose Justworks (or Another PEO) If…
- You have 5–200 employees and are actively competing for talent with larger companies
- You want to offer competitive health benefits without paying large-group premiums out of pocket
- You’re scaling fast and don’t have time to build an HR infrastructure from scratch
- You operate across multiple states and need multi-state compliance coverage
- You’ve had — or are worried about — an employment claim or compliance issue
Based on our analysis of 40+ PEO providers, the most common switch we see is businesses moving from Gusto to a PEO around the 15–25 employee mark, when benefits costs and compliance risk start to outweigh the simplicity of pure software.
What Does Each Platform Actually Cost?
Justworks charges per employee per month. Their base PEO plan starts around $59/employee/month for smaller teams, with pricing scaling based on headcount and benefits selections. That fee covers payroll, HR support, EPLI, and access to the pooled benefits — so the sticker price isn’t the whole story. Use our free PEO cost calculator to model what a PEO would actually cost versus your current setup.
Gusto’s pricing starts with a base fee (around $40/month) plus a per-employee charge (around $6–$12/month per person depending on the plan tier). Their Plus and Premium tiers add HR tools and dedicated support, pushing costs higher. What Gusto doesn’t include: the cost of your health insurance premiums, workers’ comp policy, or any HR consulting you’d need to buy separately.
The honest comparison isn’t Justworks’ fee vs. Gusto’s fee. It’s Justworks’ total cost vs. Gusto’s fee plus your standalone benefits, workers’ comp, and any compliance costs. For many businesses in the 15–50 employee range, that math favors the PEO. It’s also worth reviewing how Insperity’s costs compare if you’re weighing multiple PEO options.
Justworks vs Gusto: The Honest Verdict
These aren’t really competing products — they’re different tools for different moments in a company’s life. Gusto wins on simplicity and price for very early-stage businesses. Justworks wins on benefits access, compliance protection, and HR infrastructure for growing businesses that need more than software.
The mistake we see most often is businesses staying on Gusto (or a similar payroll tool) three or four years longer than they should because switching feels complicated. Meanwhile, they’re paying individual-market health insurance rates, carrying unprotected compliance risk, and losing candidates to competitors who can offer better benefits through a PEO. If that sounds familiar, it’s probably time for an honest evaluation.
And if you want to see exactly where you stand, our free PEO matching service narrows down the right providers for your industry, headcount, and budget — no sales pressure, just a clear comparison.
Not Sure If You’re Ready for a PEO?
Talk to a PEO specialist at PEO Marketplace. We’ll tell you honestly whether a PEO makes sense for your business right now — or whether staying on payroll software is the smarter move. Free, unbiased, no commitment.
Not ready to book a call? Get a free Benefits Benchmark Report for your industry — we will email you a breakdown of what companies your size are paying for HR, benefits, and workers comp so you can compare on your own timeline.
Frequently Asked Questions
Is Justworks actually a PEO or just payroll software?
Justworks is a certified PEO (Professional Employer Organization) and holds IRS CPEO certification, which means it takes on federal employment tax liability as a co-employer alongside your business. This is fundamentally different from payroll software like Gusto, which automates payroll processing but does not share employer legal responsibility with you.
Can I get better health insurance through Justworks than through Gusto?
Yes — in most cases, significantly better. Justworks pools your employees with thousands of other small businesses to negotiate group health insurance rates that individual small companies can’t access on their own. Gusto connects you to a broker marketplace, but your premiums are based solely on your own employee population, which typically means higher rates for smaller teams.
Is Gusto enough for a business with 20 employees?
Gusto can technically handle payroll for a 20-person team, but at that size most businesses start feeling the limitations — particularly around benefits costs, compliance exposure, and lack of dedicated HR support. In our experience matching hundreds of businesses to the right platform, 15–25 employees is the typical inflection point where a PEO starts delivering measurable ROI over standalone payroll software.
What happens to my employees if I switch from Gusto to a PEO like Justworks?
Your employees will go through a re-enrollment process and technically become co-employed by the PEO for tax and benefits purposes. From their day-to-day perspective, they’ll see a new employer of record on their paystubs and gain access to better benefits — most employees view this positively. You remain in full control of hiring, managing, and directing your team.
Are there better PEO options than Justworks for larger or more complex businesses?
Justworks is well-suited for businesses in the 5–150 employee range, particularly in professional services and tech. For businesses with more complex needs, higher headcounts, or specific industry requirements, other PEOs like Insperity, TriNet, or providers in our vetted network may be a stronger fit. PEO Marketplace works with 40+ vetted providers and matches you based on your specific situation at no cost.
