A configurable rating system provides the flexibility to define rating tariffs based on any number of input parameters, such as a service identifier, origin number, destination number, event type, or other parameter. At the same time, the configurable rating system simplifies the definition, debugging, and assignment of rating parameters which ultimately determine the calculated usage event rating. The configurable rating system implements a database table driven approach which may replace any number of custom rating functions with a single rating function which determines the appropriate charge amount regardless of the telecommunications product or service.