NRI Tax 

An Indian Citizen who stays abroad for employment/ carrying on business or vacation outside India or stays abroad under circumstances indicating an intention for an uncertain duration of stay abroad is a non-resident.

Liability to pay tax in India does not depend on the nationality or domicile of the Tax payer but on his residential status. Residential Status is determined on the basis of physical presence i.e. the number of days of stay in India in any year.