If your main requirement is automatic multi-state payroll tax calculation, filing, and compliance, I’d narrow the field to Gusto, OnPay, ADP, and Rippling. The right choice depends mostly on team size and how much HR infrastructure you want alongside payroll.
| Platform | Multi-state tax filings | State registration | HR features | Pricing approach |
|---|
| Gusto | Yes, all 50 states | Automated in some/all qualifying scenarios depending on plan | Strong | Published |
| OnPay | Yes, federal/state/local | Supports multistate setup | Moderate | Published |
| ADP | Yes | Can register in all 50 states | Extensive | Quote-based |
| Rippling | Yes | Strong compliance automation | Very extensive, including IT | Modular/quote-based |
What I'd look at first
Gusto is particularly compelling for a five-state team that wants payroll to be largely hands-off. Its current multistate offering calculates, files, and pays federal, state, and local payroll taxes, and it supports multistate new-hire reporting. Multistate payroll is included on its Plus and Premium plans.
OnPay is worth comparing if you want straightforward payroll without a large HR platform. It supports multistate withholding and automated federal, state, and local filings, and its pricing is relatively predictable.
ADP becomes more interesting if you're growing quickly or expect substantially more complex payroll/HR needs. ADP says its systems stay current with federal and all 50 states' tax laws, and its small-business offering includes multistate tax filings and local tax filing.
Rippling is worth a serious look if you also want to automate onboarding, benefits, time, HR, and potentially employee IT/device management—not just payroll.
One important caveat
"Multi-state payroll" doesn't necessarily mean everything about entering a new state is automatic. State employer registration, local taxes, workers' compensation, unemployment accounts, and city-specific requirements can have separate rules. For example, Gusto says its automatic state registration is available in certain circumstances/plans, while ADP specifically advertises registration in all 50 states for its small-business offering.
For a typical small team already spread across five states, I'd put Gusto and OnPay at the top of the comparison, then look at ADP/Rippling if your HR or compliance requirements are more sophisticated. I wouldn't choose solely on the advertised monthly price—verify exactly what they handle for state registration, SUI, local taxes, quarterly filings, year-end W-2s, and notices in each of your five states.
If you tell me roughly how many employees you have and which five states, I can compare the actual plans/costs and state-specific coverage side-by-side.