Automatic Data Processing (ADP) structures its payroll software pricing through customized, quote-based tiers depending on company size, employee headcount, and chosen service levels. For very small businesses using platforms like RUN Powered by ADP, monthly base subscription fees typically start around $59 to $100 or more, plus an additional per-employee charge that scales with services like tax filing, time tracking, and HR support. Enterprise-grade solutions like ADP Workforce Now require custom quotes based on specialized implementation scopes, making direct vendor consultation necessary for precise budgeting.