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Support (for existing clients): 1.888.237.8585

About Us

MasterTax, LLC

Headquartered in Tempe, Arizona, MasterTax is a developer of payroll tax management software designed for employers and third-party providers that helps schedule, pay, balance and file complex, multi-jurisdictional payroll taxes.

The MasterTax suite of software products provides a fully-integrated, customized solution for clients who are looking to quickly, easily and accurately process payroll taxes. MasterTax can help clients, ranging from small outsourcing providers and professional employer organizations to large multi-national companies, help 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 dedicated subject matter expert.

Since its introduction in 1997, MasterTax has been one of the fastest growing and most comprehensive payroll tax software programs in the industry. Our software is continually enhanced and upgraded to help ensure the highest quality and compliance standards. MasterTax Version 5, which was released in July 2014, currently supports more than 11,000 federal, state, and local taxes.