A system, method, and program product for determining an amount of usage of applications in an LPAR in a computer system and a bill for such usage. A guest operating system or other program executing in the LPAR determines information indicative of an amount of usage of each of the applications. Based on the information, an amount of usage of each of the applications is reported to a billing function. The billing function determines a bill for each of the applications based on the amount of usage of each of the applications. The total usage of all of the applications is determined and compared to an amount of usage of the LPAR based on the system data, to audit the amount of usage of the applications in the LPAR or a charge based on the amount of usage of the applications.