Central Board of Direct Tax (CBDT) is responsible to calculate the Cost Inflation Index, a unique 3-digit number, as defined u/s 48 of IT Act, 1961 and publish as a notification in Official Gazette.

ITR Forms for the Assessment Year 2023–24 have been announced by the CBDT in Notifications Nos. 04 and 05 of 2023, dated February 10 and February 14, respectively.