Import duty increase on liquified propane and butane takes immediate effect, altering applicable tariff entries for those gases. The Central Government has amended the First Schedule of the Customs Tariff Act to increase the import duty rate applicable to liquified propane and liquified butane by substituting the previous duty entries for the tariff classifications covering those products. The notification directs customs authorities to apply the revised duty rate to imports of liquified propane and liquified butane with immediate effect, creating immediate compliance obligations for importers and border officials.