Companies & Firm:- Every Company & Partnership Firm should (MUST) furnish Return of Income in respect of its income or loss for every previous year.
Others :- Every other person being Individual or HUF or an AOP or BOI or Artificial Judicial Person, where the Total Income of any other person in respect of which he is assessable under the Act during the previous year, without giving the effect of Sec. 10A/10AA/10B/10BA or Chapter VI-A exceeds the
max amount not chargeable to Income Tax, should also furnish a Return of Income.