Step 1: Understanding the Concept:
The question asks to identify the official body responsible for estimating the National Income in India.
Step 2: Detailed Explanation:
\[\begin{array}{rl} \bullet & \text{The Central Statistical Office (CSO) is the government agency in India responsible for the coordination of statistical activities and for evolving and maintaining statistical standards. One of its primary tasks is the estimation of national income, GDP, and other macroeconomic aggregates. In 2019, the CSO was merged with the National Sample Survey Office (NSSO) to form the National Statistical Office (NSO), which now carries out this function. } \\ \bullet & \text{The Planning Commission (now replaced by NITI Aayog) and the National Development Council were involved in national planning and policy-making, not the technical calculation of national income. } \\ \end{array}\]
Step 3: Final Answer:
Therefore, the national income in India is calculated by the Central Statistical Office (now NSO).