According to one embodiment, a tax calculation apparatus includes a display, a printer and a processor. The processor is configured to execute processes of accepting a tax calculation operation by a user; deriving tax calculation result data by executing a calculation based on a numerical data, in response to a input of the numerical data and the acceptance of the tax calculation operation, causing the display to display the tax calculation result data, and causing the printer to print tax calculation print data including the tax calculation result data and tax amount data corresponding to the tax calculation result data; and causing the display to display the tax amount data without printing, if the tax calculation operation is accepted in a state in which the tax calculation result data is displayed on the display.