A financial reporting system for reading, organizing and manipulating any accounting data and producing financial reports that may be customized to the preferences of the user. In one embodiment there is an organizational data structure for accounting data, including a trial balance data structure having a plurality of trial balance data structure elements containing accounts of the accounting data, wherein the trial balance data structure elements are linked by a distinct doubly linked list of trial balance data structure elements pointers, further comprising sub-lists of trial balance data structure elements pointers to group the accounts of the accounting data into financial statement items.