¹]3. Duty specified in the Fourth Schedule to be levied.-- (1) There shall be levied and collected in such manner as may be prescribed a duty of excise to be called the Central Value Added Tax (CENVAT) on all excisable goods (excluding goods produced or manufactured in special economic zones) which are produced or manufactured in India as, and at the rates, set forth in the Fourth Schedule:
     Provided that the duty of excise which shall be levied and collected on any excisable goods which are produced or manufactured by a hundred per cent export oriented undertaking and brought to any other place in India, shall be an amount equal to the aggregate of the duties of customs which would be leviable under the Customs Act, 1962 (52 of 1962) or any other law for the time being in force, on like goods produced or manufactured outside India if imported into India, and where the said duties of customs are chargeable by reference to their value, the value of such excisable goods shall, notwithstanding anything contained in any other provision of this Act, be determined in accordance with the provisions of the Customs Act, 1962 and the Customs Tariff Act, 1975 (51 of 1975).
     Explanation 1.-- Where in respect of any such like goods, any duty of customs leviable for the time being in force is leviable at different rates, then, such duty shall, for the purposes of this proviso, be deemed to be leviable at the highest of those rates.
     Explanation 2.-- For the purposes of this sub-section,--
         (i) "hundred per cent export-oriented undertaking” means an undertaking which has been approved as a hundred per cent export-oriented undertaking by the board appointed in this behalf by the Central Government in exercise of the powers conferred by Section 14 of the Industries (Development and Regulation) Act, 1951 (65 of 1951), and the rules made under that Act;
         (ii) "Special Economic Zone" shall have the meaning assigned to it in clause (za) of Section 2 of the Special Economic Zones Act, 2005 (28 of 2005).
     (2) The provisions of sub-section (1) shall apply in respect of all excisable goods which are produced or manufactured in India by or on behalf of the Government, as they apply in respect of goods which are not produced or manufactured by the Government.
     (3) The Central Government may, by notification in the Official Gazette, fix, for the purposes of levying the said duty, tariff values of any articles enumerated, either specifically or under general headings, in the Fourth Schedule as chargeable with duty ad valorem and may alter any tariff values for the time being in force.
    (4) The Central Government may fix different tariff values--
         (a) for different classes or descriptions of the same excisable goods; or
         (b) for excisable goods of the same class or description--
             (i) produced or manufactured by different classes of producers or manufacturers; or
             (ii) sold to different classes of buyers:
     Provided that in fixing different tariff values in respect of excisable goods falling under sub-clause (i) or sub-clause (ii), regard shall be had to the sale prices charged by the different classes of producers or manufacturers or, as the case may be, the normal practice of the wholesale trade in such goods.[