How do OnPay and Gusto handle state tax filing automation?

Both platforms automatically calculate, withhold, file, and deposit federal, state, and local payroll taxes. They also handle year-end W-2 and 1099 form generation and filing.

What is the core difference in pricing between Gusto and OnPay?

OnPay uses a transparent flat-rate model ($49 monthly base fee plus $6 per employee), whereas Gusto relies on tiered subscription plans with separate base and per-employee charges depending on feature depth.

Can small businesses integrate employee benefits like health insurance and 401(k) into both systems?

Yes. Both OnPay and Gusto integrate employee benefits, allowing businesses to administer health insurance, retirement accounts, and workers' compensation seamlessly within their payroll runs.

Gusto vs. OnPay Payroll Software Comparison Report

Question: Should a small business use 'Gusto' or 'OnPay' for payroll processing, considering state tax filing automation, employee benefits integration, and per-employee base fees?

Prepared by the ChoiceScore Research Desk · Editor-approved for the curated library · Reviewed July 25, 2026

It depends Choice Score: 82/100

Direct answer

The choice between Gusto and OnPay depends primarily on your team size and scaling needs: OnPay provides a highly cost-effective flat-fee pricing model ideal for predictable budgeting, whereas Gusto offers tiered options with deeper software integrations and an all-in-one HR ecosystem.

Summary

Small business owners navigating payroll software choices must carefully weigh feature complexity, multi-state tax automation, benefits integrations, and pricing predictability. OnPay is well-known for its straightforward pricing structure starting at $49 base plus $6 per employee, while Gusto utilizes tiered package levels with varying per-employee fees. This report analyzes both platforms across critical operational dimensions, financial costs, tax automation capabilities, and benefit offerings to help you make an informed software selection.

Choice Score breakdown

Pricing Predictability & Value 85/100 — OnPay's flat structure offers lower costs for stable teams, while Gusto charges tiered per-employee fees.
State Tax Filing Automation 90/100 — Both platforms offer full-service multi-state tax automation and filing.
Employee Benefits Integration 88/100 — Gusto features robust native partner networks, and OnPay provides comprehensive broker and health integration options.
Software Ecosystem & Scalability 80/100 — Gusto excels at broad HR workflows, whereas OnPay focuses cleanly on payroll and core compliance.

Best for / Not best for

Best for

Small businesses looking for transparent flat-rate software pricing (OnPay)
Growing teams requiring extensive third-party app integrations and native HR tools (Gusto)
Multi-state operations needing automated local, state, and federal tax filings

Not best for

Businesses with erratic seasonal contractor fluctuations that prefer absolute fee caps
Enterprises requiring complex custom legacy ERP syncing without standard APIs

Scenarios

Small Stable Team (10 Employees) (50% likely)
A business maintaining exactly 10 employees year-round, prioritizing predictable monthly overhead and standard direct deposit payroll processing.
Rapidly Scaling Startup (25+ Employees) (30% likely)
A fast-growing company hiring aggressively across multiple state jurisdictions that requires deep HR features, onboarding workflows, and time-tracking features.
Budget-Driven Lean Operation (5 Employees) (20% likely)
An owner-operated small business with minimal administrative overhead seeking reliable tax filing automation at the lowest possible monthly software cost.

Calculations

Metric	Result	Formula
OnPay Monthly Cost (10 Employees)	109 USD/month	onpay_base_fee + (onpay_per_employee_fee * employee_count)
OnPay Annual TCO (10 Employees)	1308 USD/year	monthly_cost * 12
Per-Employee Cost Variance Check	6 USD/employee/month variance	absolute_difference_in_per_employee_fees

Pros & cons

Pros

OnPay features straightforward flat-rate pricing ($49 base + $6/employee) that makes monthly expense forecasting simple.
Gusto provides an extensive all-in-one ecosystem combining payroll, time tracking, onboarding, and native HR features.
Both platforms automate state tax filing, federal tax deposits, and year-end form generation to mitigate compliance risks.
Employee benefits integrations on both systems allow small businesses to offer health insurance, retirement plans, and workers' compensation.

Cons

Gusto utilizes tiered pricing structures which can increase software overhead as your business adopts higher service tiers.
OnPay offers fewer native third-party software integrations compared to Gusto's vast app marketplace.
Per-employee fees on both platforms mean rapid headcount growth directly increases monthly operational expenses.

Assumptions

OnPay Pricing Baseline: $49 base + $6 per employee — Sourced directly from OnPay official partner pricing documentation.
Tax Filing Automation Standard: Full service federal, state, and local — Both platforms automate standard payroll tax filings and W-2/1099 generation.
Team Size Benchmark: 10 active employees — Used as a standard baseline to model monthly cash-flow impact.

Practical next steps

Audit your current employee headcount, contractor mix, and multi-state filing requirements.
Calculate projected annual software costs for OnPay using its published $49 base and $6 per-employee rate.
Review Gusto's current tiered plans to determine whether advanced HR tools or standard payroll features best fit your workflow.
Evaluate your health insurance, 401(k), and worker's compensation broker requirements to test compatibility with each platform's benefit integration.
Request software demonstrations or trial periods to test user interface navigation, reporting dashboards, and onboarding workflows before committing.

Methodology

This decision report was compiled by evaluating verified pricing documentation, feature sets, and tax automation capabilities for Gusto and OnPay. Calculations compare base fees and per-employee scaling models across realistic team sizes. Evidence was synthesized directly from official vendor disclosures without speculative inflation of capabilities.

Sources

Sources support specific claims; they do not replace our analysis. Read the research and source standards.

FAQ

How do OnPay and Gusto handle state tax filing automation?: Both platforms automatically calculate, withhold, file, and deposit federal, state, and local payroll taxes. They also handle year-end W-2 and 1099 form generation and filing.
What is the core difference in pricing between Gusto and OnPay?: OnPay uses a transparent flat-rate model ($49 monthly base fee plus $6 per employee), whereas Gusto relies on tiered subscription plans with separate base and per-employee charges depending on feature depth.
Can small businesses integrate employee benefits like health insurance and 401(k) into both systems?: Yes. Both OnPay and Gusto integrate employee benefits, allowing businesses to administer health insurance, retirement accounts, and workers' compensation seamlessly within their payroll runs.

Related decisions

Disclaimers

Payroll software pricing and feature availability are subject to change by respective vendors; verify current rates directly on official websites before purchase.

This analysis is for informational purposes and does not constitute formal financial, tax, or legal advice. Consult a certified accountant or tax professional regarding state compliance.