India has changed how it calculates GDP since Arvind Subramanian challenged the figures produced under the 2011–12-base-year series. The new series announced in 2026 reportedly brings wider price data and double deflation, but Subramanian and co-authors argue that methodological changes alone will not restore confidence: they want clearer explanations, historical revisions and timely data on parts of the economy that are difficult to measure.
What is the dispute about?
The argument is not simply whether India’s economy grew. It is about how statistical methods and available data translate economic activity into reported growth—and whether the resulting estimates can be independently understood and checked.
GDP is the value of goods and services produced within an economy. India’s national accounts combine information from different sectors and sources; where direct data are unavailable, statistical authorities may use surveys or proxy indicators. The choice of source data and method affects the estimate.
Real GDP adjusts for price changes to estimate changes in the volume of production. Nominal GDP measures output at current prices, so it reflects both changes in quantities and prices. The debate discussed here concerns the measurement of real growth and the methods used to adjust for prices; a claim about real GDP growth should not be mistaken for a claim about nominal growth.
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Why did Subramanian challenge the 2011–12 series?
In a 2019 paper, India’s GDP Mis-estimation: Likelihood, Magnitudes, Mechanisms, and Implications, former Chief Economic Adviser Arvind Subramanian argued that growth recorded under the series introduced with a 2011–12 base year was likely overstated for the years he examined. Scroll reported his estimate as about 4.5% growth, compared with an official figure near 7%, for 2011–12 to 2016–17. Those figures describe Subramanian’s contested estimate and the official figure cited in that account; they are not a settled remeasurement accepted by the government.
One focus was the use of company information and proxies to estimate output, including activity beyond the largest and most readily observed firms. More broadly, the dispute raises a recurring measurement question: when direct, timely data are incomplete, how well do available sources represent the activity being estimated?
What was the government’s response in 2019?
In a June 2019 clarification, the Ministry of Statistics and Programme Implementation (MoSPI) described the 2011–12 series as an update using newer sources and methods, aligned with the 2008 System of National Accounts. It said that surveys or proxy sources are used when direct data are not available and that changing a base year helps reflect structural changes in the economy.
The ministry also addressed double deflation—the separate adjustment of output and input prices. It said that the data available at the time did not permit its use and that its advisory committee had not agreed to adopt it at that stage.
A June 19, 2019 release by the Economic Advisory Council to the Prime Minister (EAC-PM) said the 2015 methodology incorporated the MCA21 corporate database and recommendations from the 2008 System of National Accounts. It rejected Subramanian’s analysis, arguing that he selected indicators and used an unconvincing regression. The EAC-PM also acknowledged that GDP estimation is imperfect and said MoSPI was working on improvements. These are the government’s responses to the critique; they do not, by themselves, settle the empirical disagreement.
The EAC-PM reported that real GDP estimates in OECD countries rose by an average of 0.7% after methodology changes. That is the council’s comparison, not an independent estimate of the effect of India’s revisions.
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What changes were reported for the 2022–23-base-year series?
Reuters reported on February 24, 2026, that India was due to release a new GDP series with a 2022–23 base year on February 27. The report described two notable methodological changes, based on comments from MoSPI secretary Saurabh Garg.
| Feature | 2011–12-base-year series | 2022–23-base-year series, as reported by Reuters on February 24, 2026 |
|---|---|---|
| Base year | 2011–12 | 2022–23 |
| Price items used to deflate output | About 180, according to Garg’s comparison | About 500–600 from the new CPI and old WPI series, pending a revised WPI series, according to Garg |
| Deflation method | Reuters described the older approach as relying on single deflation | Double deflation was reported: adjusting output and input prices separately to estimate real value added |
Reuters said the changes were intended to address concerns about the older approach’s reliance on wholesale prices and single deflation. These are reported plans and explanations from the period immediately before the scheduled release. The specific implementation and release status should be checked against MoSPI’s published technical documents; the figures in the report should not be read as a full description of the official method.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhy can two GDP growth rates differ without either being a direct like-for-like comparison?
A new base year or method can alter the data sources, weights or price adjustments used to estimate activity. That can change both the measured level of GDP and the historical growth rates calculated from it. For that reason, a rate produced under one methodology cannot automatically be compared with a rate calculated under another as if only the economy’s performance had changed.
In a September 2026 opinion article in The Indian Express, Subramanian, Abhishek Anand and Josh Felman acknowledged that estimates calculated using different methodologies are not directly comparable. They said that consistently applying the new method in the comparison they discussed yielded 7.8% growth. That figure is the authors’ result under their comparison, not a verdict that establishes the size of any earlier overstatement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is Subramanian arguing now?
The 2026 criticism is less a claim that the new method is technically implausible than a demand for greater transparency about how estimates are produced and revised. Subramanian and co-authors argued that technical plausibility does not resolve a broader trust deficit. They called for a research-backed explanation of growth and publication of the full “Sources and Methods” document.
The authors also raised questions about historical revisions and the availability of a long back-series. Business Today reported on September 4, 2026, that Subramanian questioned a downward revision to first-quarter FY2025–26 GDP and the absence of a long back-series. Without sufficiently clear explanations and historical data, outside readers have a harder time tracing how revisions affect comparisons over time.
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Another concern is coverage of businesses that do not appear in the same regular datasets as listed companies. Subramanian and co-authors estimated that unlisted firms and the informal economy together account for nearly 45% of the economy. That is their estimate. Their concern is that weak, untimely information about these areas makes it harder to judge how well the national accounts capture them.
How should readers assess claims that GDP was overstated?
Look first at whether a claim compares like with like. Then ask what evidence supports the estimate and what parts of the economy the underlying data cover. A practical check is to examine these four points:
- Coverage: Which firms and activities are directly measured, and where does the estimate rely on proxies?
- Price adjustment: Which price measures are used, and are output and input prices adjusted separately?
- Comparability: Are both growth rates calculated under the same base year and methodology?
- Transparency: Are data sources, revision practices, methods and historical series available for outside scrutiny?
On this record, Subramanian’s 2019 critique and the government’s rebuttal remain competing analyses. The reported 2026 changes address a methodological concern about price adjustment, while the newer criticism also asks whether the published explanations and data are sufficient to evaluate the estimates. Neither the older dispute nor the newer one can be reduced to a single growth figure without specifying whose calculation it is and which method it uses.
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