law: The Income-Tax Act, 1961
  4[151.Sanction for issue of notice.-
  (1) No notice shall be issued under section 148 by an Assessing Officer, after the expiry of a period of four years from the end of the relevant assessment year, unless the Principal Chief Commissioner or Chief Commissioner or Principal Commissioner or Commissioner is satisfied, on the reasons recorded by the Assessing Officer, that it is a fit case for the issue of such notice.
  (2) In a case other than a case falling under sub-section (1), no notice shall be issued under section 148 by an Assessing Officer, who is below the rank of Joint Commissioner, unless the Joint Commissioner is satisfied, on the reasons recorded by such Assessing Officer, that it is a fit case for the issue of such notice.
  (3) For the purposes of sub-section (1) and sub-section (2), the Principal Chief Commissioner or the Chief Commissioner or the Principal Commissioner or the Commissioner or the Joint Commissioner, as the case may be, being satisfied on the reasons recorded by the Assessing Officer about fitness of a case for the issue of notice under section 148, need not issue such notice himself.]
  4. Subs. by Act 20 of 2015, s. 36, for section 151 (w.e.f. 1-6-2015).