Service sector in India is also called as tertiary sector, where major contribution of income (y) in India is obtained from the service sector or tertiary sector, during the time of Independence, the major contributor of GDP (Gross Domestic Product) was from primary sector or agriculture, but later on the structural composition of Indian service sector increased due to increase in services like banking and finance, transportation, hospitality, insurance and many services there was more dependence on service sector for income contribution. In June 2021, India’s exports increased by 48.34% to US$ 32.5 billion, marking the seventh consecutive month of growth. The Indian services sector was the largest recipient of FDI inflows worth US$ 88.95 billion between April 2000 and June 2021. The services category ranked 1st in FDI (Foreign Direct Investment) as per data released by the Department for Promotion of Industry and Internal Trade. The research paper explains the change of dependence of Income contribution from primary sector to service sector or tertiary sector