The Nominal GDP Illusion: Why a Low Deflator Flatters India's Growth Numbers

Real growth looks stellar. Strip out the vanishing deflator and India's fiscal maths turns awkward.

By Fiscal Metrics Research24 August 2026 3

The Nominal GDP Illusion: Why a Low Deflator Flatters India's Growth Numbers — · *Unsplash*

Two numbers came out of the National Statistics Office on 5 June this year. Almost everybody quoted one of them.

The one that travelled: India's real GDP grew 7.7% in 2025-26. The one that didn't: nominal GDP grew 8.9%.

Ordinarily that pairing would be unremarkable. It matters now because the distance between the two — 1.2 percentage points — is the narrowest of the three years for which India's new national accounts series reports growth. Wedged into that gap sits the implicit GDP deflator, the economy's own broad measure of prices, running at roughly 1.1%. Against 3.5% in 2023-24 and 2.4% in 2024-25, that is not a moderation. That is a collapse.

And a collapsing deflator is one of the most flattering things that can happen to a growth statistic — and one of the least helpful things that can happen to a finance ministry.

The number nobody surveys

The deflator is not collected. Nobody walks into a mandi and writes it down. It is a residual: nominal GDP divided by real GDP. MoSPI assembles it from a large family of granular price indices — roughly 600 in the rebased series, up from about 180 — and it spans everything the economy produces, including exports, capital goods and net indirect taxes. That makes it broader than CPI and broader than WPI. It also makes it slippery.

Think of it as the exchange rate between rupees and stuff. When it drops to near zero, the same additional stuff comes back as almost no additional rupees. Real growth looks brilliant. The rupee economy barely moves. And the rupee economy is the one that pays tax, services debt and shows up in the fiscal ratios.

Why FY26's deflator went missing

Three things happened at once.

Food prices went backwards for much of the year, dragging retail inflation to 0.25% in October 2025 — a record low on the then-prevailing CPI series. Wholesale prices slid into outright deflation from mid-2025 and stayed there for months. And on 22 September 2025, GST 2.0 folded four slabs into two, cutting rates across hundreds of goods.

The third one is the subtle one, and the most underappreciated. Because the GDP deflator is measured at market prices, an indirect tax cut mechanically pushes it down. The fingerprint is visible in the accounts: net taxes on products grew 6.4% in real terms in FY26 and 6.6% in nominal terms — a price effect of essentially nothing. The quarterly path tells the same story. The deflator bottomed out at roughly 0.3 percentage points in July-September 2025, the quarter that spans the GST cut, before creeping back to about 1.2 points by January-March 2026.

There is a methodological wrinkle worth flagging. Through all of FY26 the wholesale price index — which feeds the deflator at a granular, item-by-item level — was still sitting on a 2011-12 base while GDP moved to 2022-23 and CPI to 2024. Economists were openly split on how much that staggered updating distorted the real numbers. Some called WPI the weakest link in the chain; others argued the damage is contained because the new series applies price indices industry by industry rather than as one blunt economy-wide deflator.

So a chunk of FY26's celebrated real acceleration is not extra output. It is a smaller divisor.

“A falling deflator is not a compliment. Real growth gets a free upgrade, and the exchequer quietly pays for the ticket.”

The taxman deals in rupees, not volumes

GST is charged on invoice value. Income tax on rupee income. Customs on rupee import value. Every major head of revenue is a claim on nominal GDP, which is precisely why a Budget's revenue arithmetic begins with a nominal growth assumption and works backwards from there.

The FY26 Budget assumed 10.1%. The economy delivered 8.9%.

The collections show the strain. Net direct tax collections rose 5.12% to ₹23.40 lakh crore — the weakest since the pandemic contraction — against a revised estimate built on about 9% growth, and short of the ₹24.21 lakh crore RE target. Gross direct taxes managed only 4.03%. GST held up better, with gross collections up 8.3% to ₹22.27 lakh crore, though even that sits a whisker below nominal GDP growth.

The honest caveat: FY26 was also the year of roughly ₹1 lakh crore of personal income tax relief and a large GST rate cut. Discretionary policy explains a real share of the shortfall, and any buoyancy calculated across a year of deliberate rate cuts should be read with that in mind.

But that is exactly the trap. Buoyancy is a ratio, and when the denominator is itself depressed, the ratio flatters you while the cash box stays light. A buoyancy of 1.0 against 8.9% nominal growth still leaves you more than a percentage point of revenue short of a Budget drafted for 10.1%. Buoyancy can look respectable while the numbers that actually fund schemes disappoint.

Where the illusion became a parliamentary answer

On 10 August 2026, Minister of State for Finance Pankaj Chaudhary told the Lok Sabha that the Centre's outstanding liabilities stood at 58.2% of GDP in FY26, against a budgeted 56.1%. A 210-basis-point miss on the government's own new fiscal anchor.

Almost none of it was overspending. The fiscal deficit came in at about ₹15.19 lakh crore, below the ₹15.58 lakh crore revised estimate, and landed neatly on the 4.4% target. What moved was the denominator. On 27 February 2026, MoSPI rebased the national accounts from 2011-12 to 2022-23; FY26 nominal GDP came out at ₹346.36 lakh crore instead of the ₹357.14 lakh crore the old series had projected — around 3% lower.

Run it yourself. A debt stock of roughly ₹202 lakh crore over ₹357 lakh crore is about 56.5%. Over ₹346 lakh crore it is 58.2%. The government did not borrow an extra rupee. The ruler shrank.

Notice the asymmetry, because it is the structural point. A flow — this year's deficit — can be trimmed in-year to hit a ratio. A stock — accumulated debt — cannot. That is awkward for a framework which, from FY27, treats debt-to-GDP as the anchor and the fiscal deficit as merely the “operational target”. Anchoring policy to a ratio whose denominator can be revised three per cent overnight is a design choice with consequences, and FY26 was the first live demonstration.

It isn't only the government

Nominal GDP is the yardstick against which a lot of the private economy gets judged too. Corporate revenue growth is benchmarked to it, and a listed-company topline that grows 9% in a 9% nominal economy is treading water, however respectable it looks against 7.7% real. Bank credit growth is compared to it, and credit-to-GDP looks livelier when the denominator stalls — which is not the same thing as financial deepening. Wage settlements, rent escalations and long-dated contracts are all struck in rupees, not volumes. And for states, whose borrowing headroom is fixed as a percentage of gross state domestic product, a soft deflator quietly narrows the room to spend at precisely the moment headline growth is being applauded.

None of these actors behaved differently in FY26. The measuring stick did.

Now watch it run in reverse

Here is the part few people are braced for.

Wholesale inflation, on its own rebased 2022-23 series, printed 9.78% in July 2026, easing from 9.87% in June — the highest reading in the new series. Fuel and power alone ran at 20.05%. Retail inflation has climbed to 4.45%, a 19-month high. At its August meeting the RBI held the repo rate at 5.25%, projected FY27 CPI at 5% with a peak of 5.9% in the December quarter, and pencilled real growth at 6.7%.

Put those together and FY27's deflator will not be 1.1%. It could plausibly be several times that. Nominal GDP growth may comfortably clear the Budget's 10% assumption. Tax collections will look buoyant. The debt ratio will glide down faster than the fiscal path implies.

None of that will be an achievement either. It is the same statistical mechanism wearing the opposite mask — and it will be just as tempting to claim credit for.

Two things to keep an eye on

31 August 2026. NSO releases Q1 FY27 GDP, and the June press note has already flagged that these estimates will fold in the revised IIP and WPI/PPI series with 2022-23 base. New deflators mean the back series moves again. Anyone anchoring hard to today's growth rates should expect them to shift.

The next five years. India launched a Producer Price Index on 15 June 2026 alongside the rebased WPI, expanding the wholesale basket from 697 to 957 items. PPI will run parallel before replacing WPI, and MoSPI has signalled it intends to use output PPI for deflation. That is a genuine methodological upgrade. It is also one more reason to treat any single vintage of “real growth” as provisional rather than final.

Three habits worth adopting

Read the pair, never the headline. 7.7% real means very little without 8.9% nominal sitting next to it. The gap is the information.

Judge fiscal performance by the numerator. Did the Centre borrow fewer rupees? Did it collect more rupees? Ratios are downstream of a denominator that statisticians are entitled to revise — and did.

Treat deflator swings in either direction as weather, not policy. FY26's vanishing deflator did not make India poorer. FY27's returning one will not make it richer. It only changes the length of the ruler — and a great deal of India's fiscal debate is conducted in ruler-lengths.