BERWYN, Pa.--(BUSINESS WIRE)--Vertex Inc., the leading provider of corporate tax solutions, announced today the launch of a new Software-as-a Service (SaaS) option for the company's leading payroll solution. The new Vertex® Payroll Tax Q Series® On-Demand software features minimal up-front costs, reduced implementation time and greatly reduced IT maintenance requirements relative to the traditional on-premise implementation of Vertex Payroll Tax. The on-demand model eliminates the need for comp