Income tax vide Notification No.68/2021 dated 24th May, 2021 has notified the Computation of Fair Market Value of Capital Assets for the purposes of Section 50B of the Act. Rule 11UAE of Income Tax Rules explains the criteria for computation of Fair market Value of Capital Assets for Slump Sale.
https://incometaxindia.gov.in/communications/notification/notification_68_2021.pdf