for the words “declared tariff” wherever they occur, the words “value of
supply” shall be substituted;
Hence If your Declare tarrif is Say 1500/- but & Being charged only 900/- (600 Discount Paid) then your supply will be accounted to be for 900/- & below 1000/- it's exempted As per Notification 12/2018
Note :Earlier in the Hotel industry for calculating GST rate slabs on accommodation service Declared tariff value would be considered but now the rate of tax would be decided on the basis of Value of supply instead of declared tariff.