The invention provides a system and method for constructing and maintaining a price structure for an e-commerce transaction relating to a complex product or service. A pricing tree is built of "price components" which include discrete revenues, price adjustments, taxes, and disbursements (such as royalties). Separate revenue streams, which may be allocated to different service providers, may have independent adjustment, tax, and disbursement treatments. Attributes may also be used in the calculation of separate components. Time-date adjustments and rate package adjustments are also supported. The system allows both automated calculation and accounting using the pricing tree. Transactions are supported by a modular e-commerce back-end platform.