MRP includes all taxes. No amount above declared MRP can be charged. MRP minus abatement = Assessable Value on which NCCD is to be charged.There is no need of separate notification because for the purpose of levy and collection of NCCD Central Excise Act still remains in force.
Read the following for further clarification:-
A 'National Calamity Contingent Duty' (NCCD) has been imposed vide section 136 of Finance Act, 2001 [clause 129 of Finance Bill, 2001, w.e.f. 1.3.2001]
The National Calamity duty chargeable on the goods specified in the Seventh Schedule shall be in addition to any other duties of excise chargeable on such goods under the Central Excise Act, 1944 (1 of 1944) or any other law for the time being in force.
The provisions of the Central Excise Act, 1944 (1 of 1944) and the rules made thereunder apply in relation to the levy and collection of the National Calamity duty leviable under this section in respect of the goods specified in the Seventh Schedule as they apply in relation to the levy and collection of the duties of excise on such goods under that Act or those rules, as the case may be.Amendments proposed in the Central Excise Act, to specify that Excise Duty would be applicable only on goods specified in the Fourth Schedule. All products other than Petroleum and Tobacco are proposed to be subsumed under GST. The Fourth Schedule contains tariff items related to Tobacco products, Cigarettes and Petroleum products
Although excise duty continues to be made applicable on the aforementioned products (to be subsumed under GST at a later date), the Fourth Schedule iincludes various goods which would attract GST. The provisions of 'deemed manufacture' under the Excise Act would only apply to tariff entries related to cigarettes, chewing tobacco and pan masala, including certain other products mentioned in the 'notes' to the Fourth Schedule. All other tariff entries appearing in the existing Third Schedule (relating to 'deemed manufacturing') have been deleted.
Section 3B and Section 3C have been inserted in the Excise Act, to provide emergency powers to Central Government to increase the excise duty.