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1st of all before entering data you have to enable macro in your excel then enter data, check the sheet after filling it will show errors or OK.

after entering all data press calculate tax, it will display the correct value or erros made during entering data 

Click the Microsoft Office Button , and then click Excel Options. Click Trust Center, click Trust Center Settings, and then click Macro Settings. Click the options that you want: Enable macros 

Its done. Close the file and reopen the file., a popup will come along enable macros, click OK.

You can then start filling the return