Definition of terms in tax treaties clarified: treaty definitions prevail, otherwise meanings in the Income tax Act apply. An Explanation is added clarifying that, for agreements entered into under the provision on relief for double taxation, terms defined in the agreement shall have the meaning assigned in that agreement, and terms not so defined but defined in the Income tax Act shall have the meaning assigned in the Act and any explanation issued by the Central Government; the provision takes effect from 1 April 2018 and applies to the relevant assessment year and subsequent years.