Central Value Added Tax imposed on excisable goods with tariff values fixed and differentiated by government notification. There shall be levied and collected a Central Value Added Tax (CENVAT) on all excisable goods produced or manufactured in India at rates set forth in the Fourth Schedule. Excisable goods produced by a hundred per cent. export oriented undertaking and brought into India are charged an amount equal to the aggregate customs duties applicable to like imported goods, with valuation governed by the Customs Act and Customs Tariff Act. The Central Government may fix or alter tariff values and may fix different tariff values for different classes of goods or producers.