Paychex Flex from Paychex is an online payroll processing application from Paychex. Designed for flexibility, Paychex Flex is a good fit for small to mid-sized businesses as well as accounting professionals that are interested in offering payroll services to their client base. Paychex Flex offers four plans; Express, Select, Pro, and Enterprise, with users able to easily scale up, (or down) as needed. All four Paychex Flex plans include complete payroll processing, payroll tax administration, new hire-reporting, and a free mobile app. The Select, Pro, and Enterprise plans also offer additional features such as New Employee Onboarding, Workers' Compensation reporting, and State Unemployment Insurance Service. In addition, Paychex Flex also offers AccountantHQ; an accountant-specific dashboard that allows firms to easily manage both payroll and HR from a single platform.