A multi-user information processing system and method for managing a multi-jurisdictional entity's data for determining tax returns information and tax provision information, and for tax planning purposes. The system includes a database for storing data, a calculation engine for determining tax returns information and tax provision information based on data stored in the database, a user interface unit for creating dataset(s) and manipulating the dataset(s) for tax planning purposes, and a report engine for producing reports using information from the database.