National Income
The Net National Product at factor cost is known as National Income (as mentioned in the class XI NCERT)
NNP (@Factor Cost) = National Income = NNP (@Market Price) – Taxes + Subsidies
Note:
However, the Central Statistics Office (CSO) under the Ministry of Statistics and Program Implementation defines National Income of India as Net National Income at Market Price





CSO defines National Income of India as Net National Income at Market Price because of updation in GPD calculation after 2015.
That is the norm. NCERT books time to reflect updates.