A system and method for setting a billing allocation between a user and a company allowing the costs for personal and work use of a mobile device during a period to be allocated as desired. The system and method further provides for allocation of costs associated with obtaining a new mobile device. The billing allocation model provides maximum flexibility to allow a user to obtain the mobile device desired, while still allowing the user to take advantage of a company's preferred corporate rates and discounts and allowing a company to maintain control of mobile device costs relating to purchase and use of the mobile device.