Abstract: A method and system for determining rating data for services in a communication network, wherein an incoming charging request is received from a service element (105, 106), data such as a location number associated with a service or a subscriber (102) is accessed, and a tariff structure is traversed (307). It is determining whether there is a branching condition for the data and then if any list or record (201a,b; 202a,b; 203a,b; 204a,b) is associated with a subscriber (201), account (203), subscriber group (202), or account group (204) contains the data (309, 310). A list indicator corresponding to the data is accessed (311). It is determined whether there is a branching condition for the list indicator (312), and if so the list indicator is searched in the tariff structure (313). Analyse of the tariff structure is performed based on the list indicator for finding a resulting tariff for return to the request (314-320).