Paychex vs OnPay
A head-to-head comparison for 2026 — pricing, features, and which is better for different use cases.
Quick Comparison
| Feature | Paychex | OnPay |
|---|---|---|
| Price | Custom (starts ~$39/mo) | $40/mo + $6/person |
| Free Tier | None | 1 month free |
| Payroll | Full-service, auto-tax | Full-service, auto-tax |
| HR | Onboarding, PTO, compliance | Onboarding, PTO, docs |
| Benefits | Health, retirement, workers comp | Health, 401(k) |
| Best For | Small to mid-market | Simple + transparent pricing |
Paychex — Overview
Paychex serves businesses from 1 employee to enterprise with scalable payroll and HR. Flex platform handles payroll, HR, benefits, and time tracking. The assigned payroll specialist (on higher plans) provides human support that fully automated platforms don't.
Pricing starts around $39/month for basic payroll but varies significantly by plan and employee count. Like ADP, transparent pricing requires a conversation. The strength is scalability: Paychex grows with your business from startup to mid-market without requiring a platform migration. Workers' comp pay-as-you-go and retirement plan administration are well-integrated. Best for businesses that want a scalable platform with dedicated support.
OnPay — Overview
OnPay offers the same transparent pricing as Gusto ($40/month + $6/person) with a simpler, more focused approach. Full-service payroll, automatic tax filing, and benefits administration without the feature creep that's made Gusto increasingly complex. One plan includes everything.
The 1-month free trial lets you run actual payroll before committing. The interface is clean and straightforward. HR features (onboarding, PTO, document storage) cover the basics without trying to be a full HRIS. For small businesses that found Gusto getting too complicated or expensive with add-ons, OnPay is the back-to-basics alternative. Best for small businesses that want simple, transparent payroll without unnecessary complexity.
Key Differences
Established scalability vs modern simplicity. Paychex grows with you from 1 employee to mid-market. OnPay keeps things simple and transparent for small businesses.
Pricing transparency favors OnPay. $40/month + $6/person is clear. Paychex requires a conversation. For small businesses that value knowing the cost upfront, OnPay wins on transparency.
Scalability favors Paychex. As your business grows past 50 employees, Paychex's dedicated specialists, broader benefits options, and established infrastructure handle the transition. OnPay works well at small scale but Paychex handles the growth trajectory better.
The Verdict
Choose Paychex for scalable payroll with dedicated specialists that grow with your business. Choose OnPay for the simplest, most transparent payroll at small businesses.