law: Expenditure-Tax Act, 1987 
  13. Time limit for completion of assessment
  
  and reassessment 
  (1) No order of assessment shall be made under
  
  section 9 or section 10 at any time after the expiration of a period of four
  
  years from the end of the assessment year in which the chargeable expenditure
  
  was first assessable, or one year from the date of the filing of the return or
  
  revised return under section 8, whichever is later.
  (2) No order of assessment or reassessment
  
  shall be made under section 11,- 
  (a) where the
  
  assessment or reassessment is to be made in a case falling within clause (a) of
  
  section 11 for which a notice has been served upon. the assessee, at any time
  
  after the expiration of a period of four years from the end of the assessment
  
  year in which the said notice was served;
  (b) where the
  
  assessment or reassessment is to be made in a case falling within clause (b) of
  
  section 11, for which a notice has been served, after the expiration of a
  
  period of- 
  (i) four years from
  
  the end of the assessment year in which the chargeable expenditure was first
  
  assessable, or
  (ii) one year from the
  
  date of service of such notice, whichever is later.
  (3) Notwithstanding anything contained in
  
  sub-sections (1) and (2), an order of fresh assessment in pursuance of an order
  
  passed under section 21, section 22 or section 23, setting aside or canceling
  
  an assessment, may be made at any time before the expiry of four years from the
  
  end of the financial year in which the order under section 21 is passed by 22[the
  
  Commissioner, or the order is received by the Chief Commissioner or
  
  Commissioner, as the case may be, under section 22 or section 23].
  (4) The provisions of sub-sections (1) and (2)
  
  shall not apply to the assessment or reassessment made in consequence of, or to
  
  give effect to, any finding or direction contained in an order under section
  
  21, section 22, section 23 or any order of a High Court or Supreme Court in a
  
  proceeding by way of reference or appeal under this Act or any order of any
  
  court in a proceeding otherwise than by way of an appeal or reference under
  
  this Act and such assessment or reassessment may, subject to the provisions of
  
  sub-section (3), be completed at any time.
  Explanation.- In computing the
  
  period of limitation for the purposes of this section, the period during which
  
  the assessment proceeding is stayed by an order or injunction of any court
  
  shall be excluded.