OnPay

OnPay is a full-service online payroll platform for small businesses, covering automated tax filings, direct deposit, and built-in HR tools for employee records and benefits management.

Accounting firms use OnPay for its accountant-oriented design — the platform provides a centralised dashboard where firms can manage payroll for multiple clients from a single login, run pay runs on behalf of clients, and pull detailed reports. OnPay handles federal, state, and local tax calculations and filings, and integrates with QuickBooks and Xero for journal entry sync.

The platform is best suited for small US businesses and the accounting firms that provide payroll services to them. Its straightforward pricing (flat monthly fee plus per-employee cost) and multi-client dashboard make it practical for firms that manage payroll as a service offering.