This invention relates to an expense reporting system for viewing and manipulating a user's financial transaction data and a method for associating financial transaction data with a user's project data. The system includes a user's financial transaction data hosted in a data storage unit, addressable on a network, and accessible by a remote user on a user interface unit having a user input means and a display; and an expense reporting module having a graphical user interface (GUI) that allows a user to define project category data and associate representations of the user's financial data with the user-defined project category data.