An improved method to compensate for coupling overhead in a distributed computing system offering a raw processing capacity, comprising an effective processing capacity (404) and the coupling overhead, is disclosed, wherein the distributed computing system comprises at least one computer system and at least one coupling facility. The method comprises determining a coupling efficiency, determining and adding an amount of missing processing capacity to the effective processing capacity based on the coupling efficiency in a way that the effective processing capacity of the raw processing capacity corresponds to a billable target processing capacity.