India’s revised GDP series introduces sector-specific deflators to better reflect economic realities

India’s latest GDP revisions mark a significant shift towards sector-specific price deflators and administrative data integration, aiming to produce more accurate and credible measures of economic growth amid ongoing debates over statistical methodology.

India’s latest GDP revisions are not just a routine rebasing exercise. They reflect a broader rewrite of how the Indian state converts current-price output into “real” growth, with the Ministry of Statistics and Programme Implementation shifting the national accounts to a 2022-23 base year and recasting the treatment of prices in the process. The core change is a move away from the old habit of applying a common deflator across large parts of the economy and towards a more detailed system that separates the price movement of what firms produce from the price movement of what they buy.

That methodological shift was driven in part by a long-running credibility debate. Reuters reported in February that the International Monetary Fund had criticised India’s framework for relying on an outdated 2011-12 base year, wholesale prices and extensive use of single deflation, assigning the system a “C” rating. Mint had already noted, in December 2025, that economists were struggling to reconcile episodes of slowing nominal GDP growth with buoyant real growth, and linked the puzzle to the choice of deflators. N.R. Bhanumurthy of the Madras School of Economics told Mint: “I am sure when the IMF comes back next year around this time, you would see better comments on statistics.”

In practical terms, the ministry’s answer was to use many more price markers and to apply them more precisely. Saurabh Garg, the statistics secretary, told Reuters: “We will now use about 500–600 items from the new CPI and the old WPI series, compared with about 180 earlier, to deflate the output and improve accuracy of the data.” Garg also told the Financial Express that the existing wholesale price series would serve as a stopgap until the new Producer Price Index became available. The same report said manufacturing would be handled at item level, with inputs and outputs deflated separately rather than bundled together.

That distinction is the heart of the matter. Under single deflation, a sector’s sales and raw materials are both adjusted by the same inflation measure; under double deflation, each side of the production process gets its own price index. MoSPI’s February FAQ said this change would give a clearer reading of real growth because the price effect is stripped out separately for inputs and outputs. The ministry’s wording also showed how far the rethink had gone: it said single deflation had been removed from the revised framework, even though India Today’s account of the launch said the system still relied on single extrapolation for most sectors outside manufacturing and agriculture. Either way, the broad direction was unmistakable: less use of blunt economy-wide proxies, and more use of sector-specific price signals.

Some of the revisions that have puzzled readers are not ideological or even unusual; they are built into the machinery of quarterly GDP. According to the MoSPI FAQ, quarterly estimates are compiled with a benchmark-indicator approach, in which annual national accounts act as the anchor and short-term indicators are used to interpolate the quarters. When harder data arrive later, the quarterly path is revised. The ministry said the new series aligns quarterly and annual estimates more closely and uses proportional Denton benchmarking, which should make the numbers more stable and internally consistent over time.

The overhaul also goes well beyond deflators. India Today reported that the new series draws on Goods and Services Tax data, the Public Finance Management System and e-Vahan vehicle registrations for more timely sectoral signals. The MoSPI FAQ says annual surveys such as ASUSE and PLFS are now used more directly to measure the household and informal sectors, rather than relying so heavily on proxies. The Isaac Centre for Public Policy adds that the revision also reflects expanded administrative data, including LLP filings, and the integration of Supply-Use Tables. In the centre’s reading, the result was not merely a statistical facelift but a remeasurement of the economy that helped explain a 3.08% fall in nominal GDP for FY26 under the new framework.

The first release under the rebased series showed how material those changes could be. India Today said real GDP growth for FY24 was revised to 7.2% and FY25 to 7.1%, while FY26 was then estimated at 7.6%. Real gross value added for FY26 was put at 7.7%, with nominal GDP growth at 8.6%. For FY25, the same report put primary-sector growth at 4.9%, secondary-sector growth at 8.0% and services growth at 7.9%. Those figures underline that the rebasing altered not just one headline number, but the relative story being told about industry, services and the broader expansion.

None of this means the argument is over. Mint reported before the launch that a full producer price architecture was still not in place and that some sectors would continue to rely on interim fixes even after the rebasing. That caution helps explain why the GDP series has kept changing as newer price indices and better administrative data have come in. The larger point is that India’s statisticians are trying to replace a system that could blur input costs, output prices and sector structure with one that distinguishes them more carefully. The payoff is a measure of growth that should be closer to economic reality, even if it remains subject to revision and argument.