India’s latest GDP print has reopened an old data credibility debate, pushing it to a new pitch of controversy. A headline 7.8 per cent real growth figure for Q1FY27 is being presented as proof of resilience — evidence that India is shrugging off global disruption, supply constraints, and stubborn inflation. Critics see something else entirely: an unusually low deflator under the new double-deflation framework, and a historical base revised down just enough to flatter the current number. They argue that the accompanying 10.3 per cent nominal growth figure is grossly overstated.Strip away the technical fog, and the real fight isn’t about this quarter’s print. It’s about a sharp downward revision to the Q1FY26 base that mechanically inflates this year’s growth rate, and a new 2022-23 GDP series that has quietly rewritten the past decade (see Table 1)Base-year revision and the missing linkThe shift from the 2011-12 base to a 2022-23 base has produced a uniform downward revision of past nominal GDP estimates by 3.3 percentage points for FY23-FY26 — an aggregate cut of roughly ₹42 trillion, or an annual average of about ₹10 trillion (see Table 2).The downgrade spans all major domestic demand components — household consumption, government spending, and capital formation — pointing to a systematic revision rather than isolated adjustments. Even within the new series itself, the cuts have continued: of the ₹6 trillion (7 per cent) reduction in 1QFY25 nominal GDP between the old and new series, more than half came from revisions made after the new series was first published.The pattern repeats at the quarterly level. The 1QFY26 nominal GDP estimate under the new series has been revised downward at every single release — from ₹82.7 trillion in the first advance estimate (November 2025) to ₹80 trillion in the latest release (August 2026), a cumulative cut of ₹2.7 trillion. This matters enormously for the headline growth number: had 1QFY27 GDP of ₹88.3 trillion been compared against the original, higher 1QFY26 base (in the 2022-23 series), nominal growth would have come in at just 6.7 per cent and real growth at 4.2 per cent, rather than the reported 10.3 per cent and 7.8 per cent. Hence, the debate is not merely about methodology, it raises questions about whether high-frequency indicators used for initial estimates adequately capture the broader economy.Layer on a more realistic deflator assumption, and the picture darkens further. Up to Q1FY26 the implied composition of the deflator was far more intuitive, with estimated average weights of around 46 per cent for CPI and 54 per cent for WPI. Applying those same weights to current inflation readings would produce a GDP deflator of 6.9 per cent, rather than the reported 2.5 per cent (see Chart 1).Assuming a reasonable counterfactual deflator of 6 per cent instead of the official 2.5 per cent, real growth falls to just 3.9-4.3 per cent (see Chart 2). The consistent one-way downward revisions across both annual and quarterly estimates suggest the 1QFY27 print itself may also be significantly overstated once base effects and inflation assumptions are properly accounted for.A decade that may need rewritingNo back-cast data exists under the new 2022-23 base for years prior to that base year. Without recasting the entire 2011-12 to 2022-23 series onto a consistent methodology, any claim of robust ten-year growth performance rests on shaky statistical ground. Given the pattern of persistent downward revisions, there’s a real possibility that GDP figures from FY12 onward could also face significant cuts once recast — potentially pushing the cumulative haircut for the FY16-FY26 decade close to ₹100 trillion.A history of discontinued surveysThe Central Statistics Office has not fully explained the drivers behind these large, consistent downgrades. The likely explanation lies in how informal-sector data is captured. The 2022-23 series incorporates the Annual Survey of Unincorporated Sector Enterprises (ASUSE) and other surveys that resumed after long gaps — a methodological break from the 2011-12 series, which relied on static ratios extrapolated from formal-sector growth and workforce data collected back in 2010-12. Crucially, survey-based tracking of the informal economy was discontinued after 2012-13, meaning the old series never captured how demonetisation, GST disruptions, global protectionism, or the pandemic actually affected the informal economy in real time. This created a structural upward bias, as economic activity appeared to shift towards the organised sector even as the unorganised sector shrank.This wasn’t an isolated gap. The Employment-Unemployment Survey was discontinued after 2011-12 and replaced only in 2017-18 by the Periodic Labour Force Survey — whose results were withheld from publication until after the 2019 general election, eventually revealing a 45-year-high unemployment rate of 6.1 per cent. The Household Consumption Expenditure Survey was scrapped in 2017-18 and not restarted until 2022-23, when it revealed a sharp deceleration in real household spending. The informal-enterprise survey wasn’t updated between 2015-16 and the ASUSE revival in 2023-24. In each case, when data eventually surfaced, it told a story markedly different from the official narrative — one of worsening real incomes, stagnant wages, and rising joblessness, often met at the time with denial or re-framing of the underlying weakness as a sign of consumer confidence.The deflator puzzlePerhaps the most contentious element of the release is the GDP deflator itself, which converts nominal growth into real growth. For Q1FY27, the implied deflator is just 2.5 per cent — hard to reconcile with CPI inflation near 4 per cent and WPI/PPI inflation above 9 per cent. While the new GDP series adopts the theoretically superior double-deflation methodology, it is highly data-intensive, requiring granular price information across industries and output categories for which no disclosures have been provided.A weighted back-calculation using CPI and WPI/PPI suggests a more plausible deflator around 6.7 per cent, which would put real GDP growth closer to 4 per cent rather than 7.8 per cent. The reported manufacturing deflator of -1.5 per cent, against average manufacturing WPI inflation of 7.3 per cent, is especially hard to explain without greater transparency.The Ministry of Statistics (MoSPI) has pushed back with an illustrative manufacturing example assuming benign cost pass-through, deriving a negative deflator. But actual Q1FY27 results from over 1,700 companies show sales growth of 25.6 per cent against a 40 per cent surge in raw material costs — driven substantially by rising crude prices — compressing value addition by 4.5 per cent in nominal terms, and by roughly 3.9 per cent even after applying MoSPI’s own price indices. The divergence stems from MoSPI’s optimistic assumptions about cost pass-through and the estimated manufacturing nominal GVA growth of 7.7 per cent, not from the ground-level data.A similar mismatch appears in the consumption deflator: reported private consumption growth implies a deflator of just 2.8 per cent, even as RBI surveys point to lived urban inflation near 8.5 per cent and sharply deteriorating household sentiment on jobs, income, and living costs — worse on some measures than the 2013 “Fragile Five” period. (see Chart 3)What actually mattersThe deeper issue isn’t which side is right in this methodological dispute. It’s what decelerating nominal GDP growth structurally trending around 9 per cent, a widening K-shaped economy, mounting public debt around ₹320 trillion, falling tax elasticity, a weakening youth employment picture, a widening trade deficit, growing reliance on costly external borrowing, retreating foreign investment, and persistent balance-of-payments pressure mean for India’s macroeconomic prospects. Relying on unrepresentative data to avoid confronting this reality is a policy failure that a country with India’s demographic profile can scarcely afford (see Chart 4).Same basket, different fruitWhat began as a debate over a single quarter’s growth number has exposed a deeper measurement problem. A deflator that is hard to square with every other inflation signal, combined with the absence of a transparent back-cast series linking the old and new GDP bases, leaves a full decade of growth comparisons unresolved — even as revisions have already cut estimated GDP by roughly ₹42 trillion across FY23-FY26.The official “apples and oranges” defence undercuts itself here: if the two series genuinely aren’t comparable, that is the problem, not an excuse. One series undercounted the informal economy for years; the other has been revised down at every single release since its launch. Until the NSO publishes a transparent back-cast series and clarifies its deflator methodology, the headline 7.8 per cent growth figure should be treated as indicative rather than definitive. For investors, rating agencies, and policymakers, the priority now should be statistical clarity — without it, claims about India’s growth trajectory rest on uncertain foundations, and the data raises more questions than it answers about the true pace of economic expansion.The writer is CEO and Co-Head of Equities & Head of Research, Systematix Group. Views expressed are personalPublished on September 8, 2026