This paper aims to introduce budgetary accounting system for not-for-profit organizations related to maritime and fishery in Korea Especially, these not-for-profit organizations related to maritime and fishery should design and maintain the original accounting systems because they have some objectives and activities of organizations different to for-profit organizations. Currently, while the accounting for not-for-profit units is difficult to understand, this case study of budgetary accounting system for not-for-profit organizations related to maritime and fishery as KSSIT may be great help to them by reflecting all administrative activities of these units and offering objectively and fairly financial position and phase or operating results. This paper concentrate primarily upon this subject about double-entry accounting system to be introduced in order to improve budgetary systems of not-for-profit organizations. These units are governmental organizations as public corporations and bodies corporate and politic. Therefore, not-for-profit organizations related to maritime and fishery should be applied to regulations of the Governmental Accounting Standards Board. GASB has the authority to establish standards of financial reporting for all units of government. With conclusion, this paper reviewed a case of double-entry system for budgetary accounting, and examined a process of financial reporting in not-for-profit organizations. Through this paper, the comprehensive understanding of budgetary accounting system for not-for-profit organizations as KSSIT would be promoted.