Accountix has been developing software for the PEO and ASO payroll industry since 1996. We stay at the cutting edge of development with our software in order to provide you, our customer, with the best the industry has to offer.

With 25 years of Software Developement for the Accounting/Payroll industry, Extreme has become an innovative software suite that integrates accounting and payroll into a single software environment. With a multitude of complimentary modules that further solidifies Extreme as complete solution for many business models with a variety of needs.

Extreme is a windows base application that connects to Microsoft SQL server for Data Management. Written in C# and incorporating many DevExpress functionality Extreme gives Users a vast amount of functionality in an application. Furthermore with development occurring with the latest software tools and programming standards the user benefits again by having a cutting edge application to use.

Your competitors may be delivering checks, but with The Extreme System, you will be delivering a full set of services that your client could only expect would be possible if they had a fully staffed payroll department. Now they do.

Their full-service payroll department is you. The Extreme System from Accountix brings payroll service to an entirely new level of integration and functionality. For more information visit

Vertex Exchange 2019: Innovation Award Winners

This year, six of our clients were recognized for their unique use of tax technology to drive business value. Explore how these leaders are leveraging innovation in their tax function.

Meet The Winners