(l) Notwithstanding anything contained elsewhere in this Act, the Bureau may, on information or on its own motion, or on direction given by the State Government or the Commissioner, carry out investigation or make enquiry into any case of alleged or suspected evasion of tax under this Act and, into any malpractices connected therewith.

(2)The Bureau may, for the purpose of carrying out any investigation or making any enquiry referred to in sub-section (1), exercise all the powers referred to in section 17.

(3) After a case of alleged or suspected evasion of tax has been investigated or enquired into, the Bureau shall send a report thereon to the Commissioner for such action as may be deemed necessary for the levy, collection, assessment and recovery of tax.

(4) On receipt of a report, from the Bureau, the Commissioner may require the Bureau to transfer to him any accounts, registers or documents seized by the Bureau and such accounts, registers or documents shall be retained by him for further period, if necessary, subject to the provisions of sub-section (4) of section 17.

(5) The Commissioner shall assign such functions of the Bureau to such officers of the Bureau as he may deem fit, and any person appointed under sub-section (2) of section 12 to assist the Commissioner shall, when appointed in the Bureau, be competent to exercise all the powers which are exercisable by such person under this Act and the rules made thereunder.

(6) The officers appointed in the Bureau shall have jurisdiction over the whole of West Bengal.