Headquartered in Tempe, Arizona, MasterTax is a developer of payroll tax management software that is designed for employers, third-party providers and PEOs to help them schedule, remit payments, balance and file multi-jurisdictional payroll taxes. The suite of MasterTax Software products provides a fully-integrated, customized solution for clients who are looking to quickly, easily and accurately process payroll taxes. Our software can help clients of all sizes, including small employers, large multi-national corporations, PEOs, and small and large service providers eliminate penalties and interest, maximize efficiencies, and regain control of payroll tax filing. And with our industry-leading client support, you are never more than a phone call or email away from a subject matter expert. Since its introduction in 1997, MasterTax Software has been one of the fastest growing and most comprehensive payroll tax software systems in the industry. Our software is continually enhanced and upgraded to help ensure the highest standards of quality and compliance.