To be able to manage a company efficiently, one should always have full information about both each particular business process and the whole company. Accounting can not always provide the top manager with such information, because it focuses mostly on the needs of external entities like tax office. The purpose of the management accounting is to provide full and trustworthy information necessary for making correct management decisions and plans. The management accounting reflects all factual expenses and revenues of the company, so a top manager can get a clear picture of the company operation and make reasonable decisions. To solve the management accounting tasks, our company applies a self-made Management Accounting System – MACSYS. This automated system makes it easier to make management decisions, providing the top managers with necessary information in a convenient way.