law: 8. Levy and collection of cess.
  (1) There shall be levied a cess on such intra-State supplies of goods or services or both, as provided for in section 9 of the Central Goods and Services Tax Act, and such interstate supplies of goods or services or both as provided for in section 5 of the Integrated Goods and Services Tax Act, and collected in such manner as may be prescribed, on the recommendations of the Council, for the purposes of providing compensation to the States for loss of revenue arising on account of implementation of the goods and services tax with effect from the date from which the provisions of the Central Goods and Services Tax Act is brought into force, for a period of five years or for such period as may be prescribed on the recommendations of the Council:
  Provided that no such cess shall be leviable on supplies made by a taxable person who has decided to opt for composition levy under section 10 of the Central Goods and Services Tax Act.
  (2) The cess shall be levied on such supplies of goods and services as are specified in column (2) of the Schedule, on the basis of value, quantity or on such basis at such rate not exceeding the rate set forth in the corresponding entry in column (4) of the Schedule, as the Central Government may, on the recommendations of the Council, by notification in the Official Gazette, specify:
  Provided that where the cess is chargeable on any supply of goods or services or both with reference to their value, for each such supply the value shall be determined under section 15 of the Central Goods and Services Tax Act for all intra-State and inter-State supplies of goods or services or both:
  Provided further that the cess on goods imported into India shall be levied and collected in accordance with the provisions of section 3 of the Customs Tariff Act, 1975 (51 of 1975), at the point when duties of customs are levied on the said goods under section 12 of the Customs Act, 1962 (52 of 1962), on a value determined under the Customs Tariff Act, 1975.