Managerial reporting can help corporation achieve its goal, objectives and mission. The information is useful in assessing both the past performance and future directions of the corporation. It provide decision-making support, and for evaluating and rewarding decision-marking performance. Financial reporting is useful in making investment and credit decisions. The information is useful in assessing amount, timing and uncertainty of future cash flows. It can affect economic resources, claims to resources, and changes in resources and claims. After steps of accounting processing, accounting information goes to decision makers in the corporation. With such useful information, they will decide a series of economic activities for current cycle or even the next cycle. With identifying different costing method, decision maker will do performance evaluation to see how the corporation is performing for the current year. Also, with accurate information, decision maker will do incremental analysis to identify the relevant revenues and costs for each economic activates and the expected impact in the future