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Measuring national income in India: the NSO, the release calendar, base years and beyond GDP

National Income · Part 2 / 2 · Fact-checked on 20 October 2026 · how we check

Written with AI from the sources listed at the bottom of this page, then fact-checked by a separate AI.

How India's national income figures are produced: early estimates from Naoroji to the National Income Committee, the National Statistical Office and its release calendar, base years and the 2011-12 and 2022-23 series, sectoral shares, per capita income and PPP, and green GDP and the Human Development Index.

Part 1 explained what national income measures. This part asks the practical questions: who in India actually produces the numbers, when they appear, and how they change over time. The Budget's revenue targets, the fiscal deficit ratio and the RBI's growth projections are all stated as shares of gross domestic product, so a change in how GDP is measured changes how every other figure reads. The part follows the story: the early estimates before Independence, the statistical system built after it, the calendar on which each year's figures are released and revised, the base year and its revisions, what the figures show about India's sectors and average incomes, and the measures that look beyond national income.

Attempts to measure India's national income began under colonial rule, partly to show how poor the country had become. Dadabhai Naoroji estimated the income of British India for 1867-68 at about 20 rupees a head and used the figure in his critique of the drain of wealth, later gathered in Poverty and Un-British Rule in India (1901). In the 1930s V.K.R.V. Rao produced the first estimates built on a systematic, sector-by-sector method. After Independence the government set up the National Income Committee in August 1949 under the chairmanship of P.C. Mahalanobis, with D.R. Gadgil and Rao as members. Its reports in the early 1950s laid down the methods for official estimates, and the Central Statistical Organisation, created in 1951, took over the regular work of preparing them.

Today the estimates come from the National Statistical Office (NSO) of the Ministry of Statistics and Programme Implementation (MoSPI). The NSO was formed in 2019 by merging the Central Statistics Office, which compiled the national accounts, with the National Sample Survey Office, which runs large household and enterprise surveys. Within the NSO, the National Accounts Division prepares GDP, GVA and the related aggregates for the country as a whole. Each state's Directorate of Economics and Statistics prepares Gross State Domestic Product (GSDP) for its own state, following a common method so that states can be compared. Much of the raw material is not collected by the NSO itself but flows in from elsewhere: crop estimates from the agriculture ministry, company filings, tax records, data from the RBI and the accounts of governments.

A year's gross domestic product is not announced once; it is estimated several times as better data arrive. The first advance estimates appear in early January, before the financial year has even ended, so that the Union Budget presented on 1 February can use them. Second advance estimates follow at the end of February, and provisional estimates at the end of May, about two months after the year closes. The figures for a year are then revised in later years, as fuller data such as annual surveys of industry and audited company accounts come in. Quarterly estimates follow about two months after each quarter ends. For 2025-26, for example, MoSPI's press note of 27 February 2026 gave the second advance estimates and scheduled the provisional estimates for 29 May 2026.

To separate real growth from price changes, output is valued at the prices of a chosen base year. A good base year is an ordinary one without a drought or crisis, and it must be moved forward as the economy changes: new industries appear, old ones shrink and better data become available. India's series have moved through base years such as 1948-49, 1960-61, 1970-71, 1980-81, 1993-94, 1999-2000, 2004-05 and 2011-12. The 2011-12 series, released in January 2015, made three big changes. Headline growth came to be measured by GDP at constant market prices instead of GDP at factor cost; output by industry was shown as gross value added at basic prices; and the private corporate sector was measured from company filings in the Ministry of Corporate Affairs' MCA-21 database instead of a sample of companies.

The 2011-12 series changed the picture of recent growth and set off a long debate. It sometimes showed faster growth than bank credit, industrial output and tax collections suggested, and questions arose over how MCA-21 filings were scaled up to cover all companies. In 2019 a former Chief Economic Adviser argued that growth had been overstated; government statisticians disputed his method. The next revision brought in newer data and methods. On 27 February 2026 MoSPI released a new series with base year 2022-23. It draws heavily on GST and other administrative records for quarterly estimates, covers unincorporated enterprises through annual surveys, splits firms that work in several activities, and uses double deflation in agriculture and manufacturing: output and inputs are deflated separately, so that cheaper inputs are not mistaken for higher real output.

In the three-sector scheme the primary sector covers agriculture, forestry and fishing, and mining and quarrying; the secondary sector covers manufacturing, construction, and electricity, gas and water supply; and the tertiary or services sector covers trade, hotels, transport, communication, finance, real estate, public administration and other services. Official tables and the Economic Survey often use a slightly different grouping: 'agriculture' means agriculture, forestry and fishing, while mining sits under 'industry' together with manufacturing, utilities and construction. Over the decades services have grown to more than half of India's gross value added, while agriculture's share has fallen below a fifth. Yet agriculture still employs over two-fifths of workers according to recent Periodic Labour Force Surveys, which is why output per worker on farms stays low.

per capita income divides national income by the population, giving the average income per person. India's official measure is per capita net national income. It answers a different question from GDP: a country can have a large economy but a low average income if its population is very large, which is India's position. It grows more slowly than total income whenever population grows. It is also only an average, so it says nothing about how income is shared between rich and poor, or between states. For international classification the World Bank uses gross national income (GNI, the current name for GNP) per capita, converted into US dollars, and on that basis places India in the lower-middle-income group of countries.

Comparing countries by converting their GDP at market exchange rates can mislead, because the same goods and services cost far less in some countries than in others. purchasing power parity (PPP) deals with this by asking how many rupees buy the same basket of goods and services that one US dollar buys in the United States, and converting at that rate instead. The World Bank's International Comparison Program gathers prices across countries to calculate these rates. Because many prices in India are relatively low, India's economy looks much larger in PPP terms than at market exchange rates; in the programme's 2021 round it ranked third in the world, after China and the United States.

GDP counts the timber sold from a forest but not the forest that is lost, so a country can appear to grow while running down its natural capital. green GDP tries to correct this by subtracting the depletion of natural resources and the cost of environmental damage from the conventional measures. The UN System of Environmental-Economic Accounting (SEEA) gives the international framework. In India an expert group chaired by Partha Dasgupta set out a framework for green national accounts in 2013, and MoSPI publishes environmental accounts covering assets such as forests, water and land in its annual EnviStats India reports. These accounts are prepared alongside the main GDP figures; they have not replaced them, partly because putting a money value on lost ecosystems is difficult and open to dispute.

The Human Development Index (HDI), published by the United Nations Development Programme (UNDP) in its Human Development Report since 1990, was designed by Mahbub ul Haq, drawing on Amartya Sen's ideas, to judge progress by what people are able to do and be rather than by income alone. It combines three dimensions: a long and healthy life, measured by life expectancy at birth; knowledge, measured by the mean years of schooling of adults and the expected years of schooling of children; and a decent standard of living, measured by GNI per capita in PPP dollars. The three dimension scores are combined by a geometric mean, so a country cannot fully make up for a very weak score in one dimension with a high score in another. India is placed in the medium human development group.

Taken together, a GDP number is the end of a long process, not a simple count. It is compiled by the NSO from many sources, revised several times on a published calendar, valued at the prices of a base year that is itself updated, and reported both as a total and per person. Each step carries an exam trap: advance estimates come before the year ends; mining is 'industry' in official tables but 'primary' in the three-sector scheme; India's official per capita income is net national income per head; and PPP comparisons make lower-income economies look larger than market exchange rates do. And because gross domestic product measures production rather than well-being, measures such as green accounts and the HDI stand beside it instead of replacing it.

Exam traps

• The first advance estimates of GDP come in early January, before the financial year ends; provisional estimates come at the end of May.
• The National Statistical Office was formed in 2019 by merging the Central Statistics Office and the National Sample Survey Office; it is part of MoSPI, not NITI Aayog or the RBI.
• The National Income Committee (1949) was chaired by P.C. Mahalanobis; the first per head estimate (1867-68) was Dadabhai Naoroji's; the first systematic estimates were V.K.R.V. Rao's.
• Mining and quarrying is primary in the three-sector scheme but is counted under 'industry' in official agriculture–industry–services tables.
• Since the 2011-12 series, headline growth is GDP at constant market prices and industry-wise output is GVA at basic prices, not factor cost.
• The current base year of the national accounts is 2022-23 (new series released on 27 February 2026); the previous one was 2011-12.
• In the HDI the income dimension is GNI per capita in PPP dollars, not GDP; the three dimensions are combined by a geometric mean.
• India's economy is larger in PPP terms than at market exchange rates, because many prices in India are relatively low.

Recap

• Early estimates: Naoroji (1867-68, about 20 rupees a head), V.K.R.V. Rao (1930s, first systematic); National Income Committee 1949 under Mahalanobis; CSO from 1951.
• Today: National Statistical Office under MoSPI (CSO and NSSO merged in 2019); states' Directorates of Economics and Statistics prepare GSDP.
• Calendar: first advance (early January), second advance (end of February), provisional (end of May), revised in later years; quarterly about two months after each quarter.
• Base year: a normal year, updated as the economy changes; 2011-12 series (January 2015) brought GDP at market prices as headline, GVA at basic prices and MCA-21 data.
• New series with base year 2022-23 (27 February 2026): GST and administrative data, annual surveys of unincorporated firms, double deflation in agriculture and manufacturing.
• Sectors: services above half of GVA, agriculture below a fifth but over two-fifths of workers; mining is primary but under 'industry' in official tables.
• Per capita income = net national income ÷ population; World Bank classes India as lower-middle income on GNI per capita.
• Beyond GDP: PPP (India third in the 2021 ICP round), green accounts (SEEA, Dasgupta group 2013, EnviStats India), HDI (UNDP, three dimensions, geometric mean).

Practice questions

Sources

• Ministry of Statistics and Programme Implementation (National Statistical Office): National Accounts Statistics, Sources and Methods; press note on the new series of national accounts with base year 2022-23 and second advance estimates for 2025-26 (27 February 2026); EnviStats India — https://mospi.gov.in
• Economic Survey, Ministry of Finance, Government of India (chapters and statistical appendix on national income and sectoral shares) — https://www.indiabudget.gov.in/economicsurvey/
• Periodic Labour Force Survey annual reports, National Statistical Office, MoSPI — https://mospi.gov.in
• World Bank: country classification by income (GNI per capita, Atlas method); International Comparison Program, 2021 round results (2024) — https://www.worldbank.org/en/programs/icp
• Green National Accounts in India: A Framework, report of an expert group chaired by Partha Dasgupta, MoSPI (2013) — https://mospi.gov.in
• United Nations Development Programme: Human Development Reports and technical notes on the Human Development Index — https://hdr.undp.org