PURPOSE: A system and a method for processing tax accounting on the online are provided to correct the input of the wrong data by the ignorance or a mistake of a user in case that the user directly inputs the related data through the online. CONSTITUTION: An I/O(Input/Output) processor(411) converts the tax accounting related data of the user inputted through the online into the data optimized to a tax accounting process, and output a tax accounting process result. A tax accounting processor(412) performs the tax accounting process by receiving the optimized input data and output the result to the I/O processor. An I/O data storage(420) stores the data inputted from the user and the processing result depending on an order of the I/O processor, and stores the data needed for generating the optimized data. A program data storage(430) stores a program or the data related to the tax accounting process by connecting to the tax accounting processor.
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