There is discloses an on-line method of analysing financial accounting data, a server and a computer program. Certain embodiments of the method comprise receiving at a server uploaded financial accounting data from a client computer which includes a set of accounts A organized into account groups G. The financial accounting data is mapped to an accounting ontology stored at the server comprising at least a pre-defined set of primary category tags C and a pre-defined set of base level tags B each associated with a primary category tag C. The accounts are mapped according to mapping account groups G to primary category tags C and mapping accounts A to base level tags B, wherein each base level tag B has an associated set of criteria K. The mapped data is then analysed at the server. The results may be authorized to be shared with interested third parties.