(1) Notwithstanding anything contained in this Act or the rules made thereunder, the Federal Government may specify, by notification in the official Gazette, that sales tax chargeable on the supply of goods of such description or class shall, with such limitations or restrictions as may be prescribed, be levied and collected on the difference between the value of supply for which the goods are acquired and the value of supply for which the goods, either in the same state or on further manufacture, are supplied.

(2) Notwithstanding anything contained in this Act or the rules made thereunder, the Federal Government may, by notification in the official Gazette, and subject to the conditions, limitations, restrictions and procedure mentioned therein, specify the minimum value addition required to be declared by certain persons or categories of persons, for supply of goods of such description, or class as may be prescribed, and to waive the requirement of audit or scrutiny of records if such minimum value addition is declared.