Description Planitax provides hosted software and services designed to help corporate tax departments manage risk and improve internal controls related to their companies' tax filings. Offered as a subscription-based online service, the company's Corporate Tax Horizons software includes modules for global entity management, research and development tax credit management, data collection, and audit management. Clients include Guidant and Cypress Semiconductor. Founded in 1999 by chief strategy officer Seda Taysi, Planitax has received venture capital funding from Mobius Venture Capital, Draper Fisher Jurvetson, and Access Venture Partners.