(1)If a person wilfully fails to furnish in due time the return of income, which is required to be furnished under section 263(1), or by notice given under sections 268(1) or 280, he shall be punishable,—(a)in a case, where the amount of tax, which would have been evaded if the failure had not been discovered, exceeds twenty-five lakh rupees, with rigorous imprisonment for a term which shall not be less than six months but which may extend to seven years, and with fine;(b)in any other case, with imprisonment for a term which shall not be less than three months but which may extend to two years and with fine.