6. Liability to tax on inter-State sales

(1) Subject to other provisions contained in this Act, every dealer shall, with effect from such date as the Central government may, by notification in the Official Gazette, appoint, not being earlier than thirty days from the date of such notification, be liable to pay tax under this act on all sales 3[of goods other than electrical energy] effected by him.in the course of inter-state trade or commerce during any year on and from the date so notified.

[Provided that a dealer shall not be liable to pay tax under this Act on any sale of goods which, in accordance with the provisions of sub-section 3 of section 5 is a sale in the course of export of those goods out of the territory of India.]

(1-A) A dealer shall be liable to pay tax under this Act on a sale of any goods effected by him in the course of inter-state trade or commerce not withstanding that no tax would have been leviable (whether on the seller or the purchaser) under the sales tax law of the appropriate State if that sale had taken place inside that State.]

*[2] Not withstanding anything contained in sub-section(1) or sub-section (1A), where a sale of any goods in the course of inter-State trade or commerce has either occasioned the movement of such goods from one State to another or has been effected by a transfer of documents of title to such goods during their movement from one State to another, any subsequent sale during such movement effected by a transfer of documents of title to such goods-to a registered dealer, if the goods are of the description referred to in sub-section (3) of Section 8, shall be exempt from tax under this Act;

Provided that no such subsequent sale shall be exempt from tax under the sub-section unless the dealer effecting the sale furnishes to the prescribed authority in the prescribed manner and within the prescribed time or within such further time as that authority may, for sufficient cause,permit,-

(a) a certificate duly filled and signed by the registered dealer from whom the goods were purchased containing the prescribed particulars in a prescribed form obtained from the prescribed authority; and

(b) If the subsequent sale is made to a registered dealer, a declaration referred to in of sub-section(4) of section 8; 

Provided further that it shall not be necessary to furnish the declaration or the certificate referred to in clause (b) of the proceeding proviso in respect of a subsequent sale of goods if,

(a) the sale or purchase of such goods is, under the Sales Tax law of the appropriate State, exempt from tax generally or is subject to tax generally at a rate which is lower than three percent or such reduced rate as may be notified by the Central Government, by notification in the Official Gazette, under sub-section (1) of Section 8 (Whether called a tax or fee or by any other name); and

(b) the dealer effecting such subsequent sale proves to the satisfaction of the authority referred to in the preceding proviso that such sale is of the nature referred to in clause (a) or clause (b) of this sub-section.]

(3) Not withstanding anything contained in this Act, no tax under this Act shall be payable by any dealer in respect of sale of any goods made by such dealer, in the course of inter-State trade or commerce, to any official, personnel, consular or diplomatic agent of ---

(i) any foreign diplomatic mission or consulate in India ; or

(ii) the United nations or any other similar international body, entitled to privileges under any convention or agreement to which India is a party or under any law for the time being in force, if such official, personnel, consular or diplomatic agent, as the case may be, has purchased such goods for himself or for the purposes of such mission, consulate, United Nations or other body.

(4) The provisions of sub-section (3) shall not apply to the sale of goods made in the course of inter-State trade or commerce unless the dealer selling such goods furnishes to the prescribed authority a certificate in the prescribed manner on the prescribed from duly filled and signed by the official personnel, consular or diplomatic agent, as the case may be.