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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/te9rel49/01_MAINTAINING_COMPANY_DATA_IN_TALLY/03_F11_Company_Features/F3_Statutory_Taxation.htm

F3 : Statutory & Taxation

This feature enables you to set the Statutory Features required for the transactions.

Go to Gateway of Tally > F11: Features > F3: Statutory & Taxation

 

For more information on enabling statutory features refer