The invention relates to a method and system that processes a plurality of transactions shared by a group of members. A mobile device comprises: a memory; and a computer processor, coupled to the memory, programmed to: identify a plurality of members of a group sharing an event; identify a plurality of transactions made by each member of the group; determine whether each transaction is relevant to the event; automatically add each relevant transaction to the group; automatically categorize each transaction into a category associated with the event; and access, via an interactive display on the mobile device, a running total of expenses associated with the event and an individual share for a member of the group at a point in time.