Termination of tax treaty: diplomatic notice triggers different effective dates for treaty cessation in each State. The Agreement permits either Contracting State, after five years from entry into force, to terminate by written notice through diplomatic channels given on or before the thirtieth day of June in any calendar year; upon such notice the treaty ceases to apply in India for income arising in any fiscal year beginning on or after the following 1 April, and in Oman for income arising on or after the 1 January in the calendar year immediately following the year in which notice is given.