Abstract: A method and system handles cost and revenue allocation for service orders. For a service order, there is allowed to be created planned rules for allocation of costs to one or more service providers and for allocation of expected revenues to be received from one or more service receivers, which are forwarded in electronic form, if created, to a cost accounting system. After receipt of a confirmation that the service order has been executed wherein the confirmation includes information about costs actually incurred in executing the service order, there is allowed the creation of revised or newly created rules for allocation of the incurred costs to the one or more service providers and for the allocation of the revenues to be received from the one or more service receivers, which are forwarded in electronic form, if created or revised, to the cost accounting system.