Why India's growth number is being argued about: the base year problem, explained

On August 31, 2026 the National Statistics Office published a single number that both helped and hurt the government: real GDP in the April-June quarter of the 2026-27 financial year had grown 7.8% over a year earlier. The Prime Minister called it a herculean feat achieved through war and supply-chain disruption. Within two weeks, the number was being described by critics as a greatly distorted picture.

Neither side is fabricating a figure. The disagreement runs through a technical choice that most arguments about Indian GDP eventually reach: the base year against which every rupee of output is measured.

What a base year actually does

National accounts do not count output directly. They count how much more, in real terms, the economy produced than it produced in a fixed reference year. Change the reference year and you change the yardstick, which changes the growth rate implied by the same set of nominal numbers.

The Statistical Commission had recommended a shift to 2022-23 as the new base, and the NSO has now rebased its series to it. India previously measured from 2011-12, a year that looks increasingly distant from the structure of the economy — a smaller manufacturing base, a different services mix, a different telecommunications sector.

• Real GDP at constant prices for Q1 of FY2026-27 was estimated at ₹81.36 lakh crore, against ₹75.46 lakh crore in the same quarter of FY2025-26.
• Nominal GDP at current prices grew 10.3% over the same comparison, and real gross value added grew 8.2%.
• Gross fixed capital formation rose 11.9%, more than double the 5.8% recorded a year earlier.

The rebound in capital formation is the part of the print that most analysts, including the government's own economic adviser, single out. It is also the part most exposed to a rebasing argument, because investment is where the composition of the economy has shifted furthest.

Where the 2.6% figure comes from

Former Finance Secretary Subhash Garg argued in September 2026 that nominal GDP growth in the quarter was 2.6% rather than the 10.3% in the official release. His method was to compare a Q1 figure computed on the 2011-12 base with a Q1 figure computed on the 2022-23 base — that is, to measure across the rebasing rather than within a single series.

That is a defensible thing to want to know and a problematic thing to present as the growth rate. Official growth rates are always calculated within one series. Cross-base comparisons answer a real question — how large is the discontinuity created by the rebasing — but the answer to that question is not the quarter's growth rate. Mixing the two is how a 7.8% print and a 2.6% print end up describing the same three months.

Why this has happened before

This is not the first rebasing argument in Indian national accounts. The previous base-year revision, carried out in 2015, produced an upward revision to growth in the years after 2012-13, and analysts at the time split over whether that reflected genuine recovery or an artefact of the new weights.

The more uncomfortable comparison came later. Arvind Subramanian, Chief Economic Adviser between 2014 and 2018, argued in a paper published through Harvard University that growth between 2011-12 and 2016-17 was likely closer to 4.5% than to the 7% then being reported — a claim that remains part of the debate about how reliable the pre-2015 series is.

That matters for the current argument in one specific way. If the older series was overstated, then the year-on-year comparisons that sit inside the new series inherit some of that problem, and no amount of precision in the new base year repairs it.

What the institutions say

The Reserve Bank of India had estimated 7.0% growth for the quarter, so the official print came in above its own forecast. Rating agency S&P Global affirmed India's sovereign rating at BBB/A-2 with a stable outlook in August 2026, following the 2025 upgrade.

None of those institutions certify the quarterly print. Ratings look at debt, deficits and growth durability over a horizon of years. The quarterly number is a measurement, and measurements can be revised — as FY2025-26 was, upward, when the final estimates incorporated January-March data that had not been available in February.

What to watch

• Whether the NSO publishes an explicit bridge reconciling the 2011-12 and 2022-23 series, which would let the discontinuity be measured rather than argued.
• Whether rural consumption recovers. Agriculture growth slowed to 3.6% in the quarter from 4.4% a year earlier, and economists have flagged sluggish rural demand.
• Whether the investment surge repeats in Q2 or proves to be a single-quarter capacity build.

The honest position is narrower than either side wants. The economy grew, the growth was strong, and the measurement of it has a known discontinuity that nobody has yet fully quantified in public. Both facts are true. The argument is mostly about which one gets to be the headline.