Producer prices and double deflation: what changed in India's new GDP series
Can real growth outrun nominal growth? In the new GDP series it sometimes can. Here is why.
Published 10 September 2026. Written by Pratidin from the reports linked at the end; every fact checked by a separate review before publishing. How we work
An explainer in The Indian Express on 10 September 2026 set out the biggest method change in the new GDP series of the Ministry of Statistics and Programme Implementation (MoSPI): the move from single to double deflation in calculating real Gross Value Added (GVA), using Producer Price Indices (PPI). The series, with 2022-23 as its base year in place of 2011-12, was released on 27 February 2026. MoSPI's release of 31 August 2026 states that the new series "has adopted the Double Deflation approach for estimating the GVA of the Manufacturing sector", with output and intermediate consumption separately deflated using the relevant PPIs, and that the estimates largely follow the IMF's Quarterly National Accounts Manual, 2017.
GVA is output minus intermediate consumption, the inputs bought from other producers. To get real GVA, price changes must be removed. Under single deflation, MoSPI used one deflator, drawn from sub-indices of the Consumer Price Index (CPI) or the Wholesale Price Index (WPI), which misleads when input and output prices move at different rates. Under double deflation, output is deflated by output prices and inputs by input prices. The PPI measures prices received by producers at the first point of sale, excluding taxes and trade and transport margins, and unlike the WPI it covers services. One consequence: if input prices rise faster than output prices, real GVA growth can exceed nominal growth, giving a negative implied deflator.
The explainer comes amid a debate over the series. Real GDP grew 7.8% in April to June 2026 and nominal GDP 10.3%, an implied deflator of only about 2.3%. Former officials including Arvind Subramanian and Subhash Chandra Garg have questioned data quality and the growth calculation. MoSPI Secretary Saurabh Garg told The Indian Express on 9 September that the methods and data had been public for months: sub-committee reports of the Advisory Committee on National Accounts Statistics in February, a new Index of Industrial Production series in May and output PPI data in June. He said the series now draws on GST, the Periodic Labour Force Survey and the Annual Survey of Unincorporated Sector Enterprises, and that revised past numbers are better estimates, not overestimates.
Prelims facts
- India's new GDP series has 2022-23 as its base year, replacing 2011-12, and was released on 27 February 2026.
- The new series uses double deflation for manufacturing GVA: output and intermediate consumption are deflated separately using Producer Price Indices.
- The PPI measures prices received by producers at the first point of sale, excluding taxes and trade and transport margins, and can cover services, unlike the WPI.
- Under double deflation, real GVA can grow faster than nominal GVA if input prices rise faster than output prices, giving a negative implied deflator.
- In April to June 2026 real GDP grew 7.8% and nominal GDP 10.3%, implying a GDP deflator rise of about 2.3%.
Quick recall
- Base year of India's new GDP series
- 2022-23, replacing 2011-12.
- Date the new GDP series was released
- 27 February 2026.
- What is double deflation?
- Deflating output and intermediate consumption separately with their own price indices, and taking real value added as the difference.
- For which sector does the new series apply double deflation, as MoSPI's release states?
- Manufacturing.
- What does the Producer Price Index measure?
- Prices received by domestic producers at the first point of sale, excluding indirect taxes and trade and transport margins.
- Which international manual does the new quarterly series largely follow?
- The IMF's Quarterly National Accounts Manual, 2017.
- Real and nominal GDP growth in April to June 2026
- 7.8% real and 10.3% nominal.
- When can real GVA growth exceed nominal GVA growth?
- Under double deflation, when input prices rise faster than output prices, giving a negative implied deflator.
Prelims practice question
In national income accounting, 'double deflation' refers to:
- Deflating GDP first by the CPI and then again by the WPI
- Separately deflating output and intermediate consumption with their own price indices to obtain real value added
- Adjusting GDP for both inflation and exchange-rate changes
- Removing both product taxes and product subsidies from GDP
Show answer
Answer: (b) Separately deflating output and intermediate consumption with their own price indices to obtain real value added. Double deflation deflates output with an output price index and inputs with an input price index; real value added is the difference. India's new series applies it to manufacturing using Producer Price Indices. The other options describe unrelated adjustments.
Use this in UPSC Mains: previous-year questions
Recurring theme: Measuring growth and inflation: national accounts, base years, price indices and the quality of India's GDP data.
- How to use this
The double deflation debate lets you question whether high real growth with a low deflator reflects real strength, since the result depends on how prices are removed.
- In April to June 2026 real GDP grew 7.8% and nominal GDP 10.3%, implying a deflator of only about 2.3%.
- The new series (base 2022-23, released 27 February 2026) deflates manufacturing output and inputs separately with PPIs; if input prices rise faster, real growth can exceed nominal growth.
- Former officials including Arvind Subramanian questioned data quality, while MoSPI says methods were public and the series now uses GST, PLFS and ASUSE data.
The WPI's blind spot for services is one reason the new GDP series moved to Producer Price Indices, which can cover services, for deflating output.
Mains practice question
Explain the shift from single to double deflation in India's new GDP series. How does it change the measurement of real growth, and why has the new series drawn criticism? (250 words)
Model answer
India's new GDP series, with base year 2022-23 and released on 27 February 2026, replaced single deflation with double deflation for manufacturing GVA, using Producer Price Indices (PPI).
From single to double deflation
- Old method: one deflator, from CPI or WPI sub-indices, applied to nominal value added, assuming input and output prices move together.
- New method: output and intermediate consumption deflated separately with output and input PPIs; real GVA is the difference.
- Why PPI: it measures producers' prices at the first point of sale, excludes taxes and margins, and covers services, unlike the WPI.
- It aligns India with the IMF's Quarterly National Accounts Manual, 2017.
Effect on real growth
- Real GVA reflects actual volume changes when commodity prices swing.
- If input prices rise faster than output prices, real growth can exceed nominal growth, with a negative implied deflator.
- In April to June 2026, real GDP grew 7.8% and nominal 10.3%, a deflator of only about 2.3%.
Criticism
- Former officials including Arvind Subramanian and Subhash Chandra Garg questioned data quality and the growth calculation.
- A low deflator can overstate real growth if price indices are weak.
- A new PPI with a short history makes back-series checks hard.
MoSPI's response
- Methods and sub-committee reports were public from February 2026; new IIP and output PPI data followed in May and June.
- New data sources (GST, PLFS, ASUSE) replace proxies for the informal sector.
Way forward
- Publish PPI weights and a long back series; invite independent review.
Better methods will earn trust only when they are transparent and tested over time.
The basics
Why this matters
Every growth number India reports is a real number: the value of what was produced, with the effect of price changes stripped out. How the prices are stripped out can move the answer. The new GDP series, with 2022-23 as its base year, changed this step. Understanding it explains why the April to June 2026 growth of 7.8% has been debated and why real growth can sometimes run ahead of nominal growth.
Value added, not output
A factory's contribution to the economy is not the value of what it sells but what it adds: output minus the inputs it buys from other producers, called intermediate consumption. Summed across the economy, this is Gross Value Added (GVA). Adding product taxes and subtracting product subsidies gives GDP.
- 1Measure outputValue of goods and services produced, at current prices
- 2Subtract inputsRemove intermediate consumption bought from other producers to get nominal GVA
- 3Remove price changeDeflate by price indices to express GVA at base-year (2022-23) prices
- 4Add up and adjustSum across sectors and add product taxes less subsidies to get real GDP
One deflator or two
Under the old approach, statisticians took nominal value added and divided it by one price index, drawn from sub-indices of the Consumer Price Index (CPI) or the Wholesale Price Index (WPI). This assumes input and output prices move together. Under Double deflation, output is deflated by an output price index and inputs by an input price index, and real value added is the difference. The new series applies this to manufacturing, using the Producer Price Index.
- One price index applied to value added
- Deflators drawn from CPI or WPI sub-indices
- Misleads when input and output prices diverge
- Output and inputs deflated separately
- Uses output and input Producer Price Indices
- Adopted for manufacturing GVA in the 2022-23 series
Why the PPI
The PPI measures prices received by domestic producers at the first point of sale, leaving out taxes and trade and transport margins. Unlike the WPI, it can cover services. This matches the international standards in the IMF's Quarterly National Accounts Manual, 2017, which MoSPI says the new series largely follows.
When real beats nominal
If input prices rise faster than output prices, deflating inputs by a bigger number shrinks real inputs more than real output. Real value added can then grow faster than nominal value added, and the implied GDP deflator turns negative. This is arithmetic, not a data error.
Go deeper
In one line: India's new GDP series, base 2022-23, removes price effects from manufacturing output and inputs separately using Producer Price Indices, instead of applying one CPI or WPI based deflator to value added.
Why it matters for UPSC
GS3 asks about growth, its measurement and its quality, and Prelims tests the difference between CPI, WPI, the GDP deflator, GVA and base years. The new method also sits at the centre of a live debate on whether growth is being measured well.
The core idea
Real growth is measured on Gross Value Added, which is output minus inputs. Price changes must be removed from both. Under Double deflation, output and inputs are deflated separately, using the Producer Price Index for manufacturing. The ratio of nominal to real values gives the GDP deflator, which can turn negative when input prices rise faster than output prices.
Numbers and dates to remember
- 2022-23: base year of the new series, replacing 2011-12.
- 27 February 2026: new annual and quarterly GDP series released.
- IMF Quarterly National Accounts Manual, 2017: the standard the series largely follows.
- May 2026: new Index of Industrial Production series; June 2026: output PPI data from 2022-23 released.
- April to June 2026: real GDP 7.8%, nominal GDP 10.3%, real GVA 8.2%, nominal GVA 11.5%.
- 30 November 2026: next quarterly release.
Where to go next
- Gross Value Added: the measure that double deflation changes.
- Double deflation: why two deflators beat one.
- Producer Price Index: the new price yardstick.
- GDP deflator: the economy-wide price change hidden in the gap between nominal and real.
Go deeper: better method or flattering numbers?
The case for the change is methodological. Single deflation is known to bias real Gross Value Added whenever input and output prices diverge, for instance when oil or metal prices swing. Double deflation with a Producer Price Index follows international practice, and the new series also brings in more data: GST records, the Periodic Labour Force Survey (PLFS), the Annual Survey of Unincorporated Sector Enterprises (ASUSE) and digital records such as eVahan and the Public Financial Management System. MoSPI says it now uses direct ASUSE and PLFS figures rather than proxies to estimate the informal sector.
The critics' case is about timing and trust. When the April to June 2026 estimate of 7.8% beat most forecasts, former officials including Arvind Subramanian and Subhash Chandra Garg questioned data quality and the growth calculation. A low implied GDP deflator means that much of nominal growth was counted as real growth, and under double deflation a faster rise in input prices than in output prices can make real value added grow faster than nominal value added. Open questions include how the new PPI weights were set and how the back series was rebuilt.
MoSPI's reply, given by Secretary Saurabh Garg on 9 September 2026, is that the "furore" came six months after the release, that sub-committee reports of the Advisory Committee on National Accounts Statistics were published in February 2026, and that the new IIP and output PPI data were released in May and June. Revised past numbers, he argued, are better estimates, not overestimates. The lasting test will be whether the new series tracks tax receipts, jobs and corporate results over time.
Gross Value Added
The measure of production from which real growth is calculated.
In one line: Gross Value Added is the value of output minus the value of intermediate consumption, the contribution each producer and sector makes to the economy.
How it works
A mill that sells cloth for ₹100 after buying yarn and power worth ₹70 adds ₹30 of value. Adding such contributions across farms, factories and services gives GVA at basic prices. GDP equals GVA plus taxes on products minus subsidies on products. GVA is the better guide to what is happening sector by sector, because it is not moved by changes in product taxes.
Why it is in the news
In April to June 2026 real GVA grew 8.2% and nominal GVA 11.5%. How real GVA is calculated changed in the new series: for manufacturing, output and inputs are now deflated separately.
Where to go next
Double deflation
The central method change in the 2022-23 series.
In one line: Double deflation removes price change from output and from inputs separately, and takes real value added as the difference.
Single versus double
In single deflation, nominal value added is divided by one price index, which assumes input and output prices change at the same rate. In double deflation, output is divided by an output price index and intermediate consumption by an input price index. MoSPI says the new series uses double deflation for manufacturing, with output and intermediate consumption "separately deflated using concerned Producer Price Indices".
The surprise it can produce
If input prices rise much faster than output prices, real inputs shrink more than real output, so real value added can grow faster than nominal value added. The implied deflator is then negative. This follows from the arithmetic and is one reason the new numbers have drawn questions.
Where to go next
Producer Price Index
The price index that makes double deflation possible.
In one line: The Producer Price Index measures the average change in prices received by domestic producers for their goods and services, at the first point of sale and excluding indirect taxes.
How it differs from WPI and CPI
The WPI tracks wholesale prices of goods and does not capture services. The CPI tracks retail prices paid by consumers and is the RBI's measure for inflation targeting. The PPI looks at the producer's side: it excludes taxes and trade and transport margins, and it can cover services. Output PPIs price what producers sell; input PPIs price what they buy.
Why it is in the news
Output PPI data from 2022-23 were made public in June 2026, and granular output PPIs are now among the main data sources for quarterly GDP. They allow manufacturing GVA to be double deflated in line with international standards.
Where to go next
GDP deflator
The price measure hidden in the gap between nominal and real GDP.
In one line: The GDP deflator is the ratio of nominal GDP to real GDP, and its change is the broadest measure of price change across everything the economy produces.
How it is read
Nominal GDP values output at current prices; real GDP values it at base-year prices. Dividing one by the other gives the implicit price deflator. Unlike the CPI or WPI it has no fixed basket: it covers all domestically produced goods and services, including investment goods and government services.
Why it is in the news
In April to June 2026 nominal GDP grew 10.3% and real GDP 7.8%, so the implied deflator rose only about 2.3%. A low deflator lifts real growth for a given nominal figure. Under double deflation, a sector's implied deflator can even turn negative when input prices rise faster than output prices.
Where to go next
Take the 10 September 2026 quiz: 30 Prelims-style questions with answers