The Ministry of Statistics and Programme Implementation (MoSPI) has announced plans to adopt the Producer Price Index (PPI) as a deflator for quarterly and annual GDP estimates, replacing the Wholesale Price Index (WPI) wherever applicable. The shift, confirmed by MoSPI Secretary Saurabh Garg, will align India’s national accounts with the international statistical standards followed by most advanced economies. The updated GDP estimates incorporating the PPI deflator are expected alongside the April-June quarter GDP data for 2026-27.
What Is the Producer Price Index (PPI)?
The Producer Price Index (PPI) measures the average change in the prices received by domestic producers for their goods and services at the point of first commercial sale. In simple terms, it tracks what factories and service providers actually earn for their output, before any taxes, wholesale margins, or distribution costs are added.
India launched its first-ever PPI series on June 15, 2026, with a base year of 2022-23. The new index is compiled by the Office of the Economic Adviser (OEA), which functions under the Department for Promotion of Industry and Internal Trade (DPIIT) within the Ministry of Commerce and Industry. The WPI, which has been in use for over eight decades since its introduction in 1942, was also simultaneously revised to the same base year with an expanded item basket from 697 to 957 products.
The fundamental difference between WPI and PPI is one of timing and scope. The WPI records prices at the wholesale trading stage, which includes some distribution costs and taxes. The PPI, by contrast, records prices at the factory gate, giving a cleaner picture of production-side inflation without the distortions caused by intermediaries. This is the standard followed by the US (Bureau of Labor Statistics), the European Union (Eurostat), and G20 peers such as China, Japan, and the UK.
Why WPI Needed to Be Replaced
The WPI, despite its long history, suffered from four structural flaws that made it increasingly unsuitable for a modern, services-dominated economy.
It excluded services. The WPI covered only goods, leaving out the services sector which now accounts for more than 55% of India’s GDP. For a country where banking, telecom, insurance, IT, and transport drive economic growth, a price index that completely ignores services is a poor guide to economy-wide inflation.
It suffered from double counting. Intermediate goods, such as steel used to make auto parts which are further used to make cars, were counted at each stage of the wholesale chain. This inflated the measured price change and distorted the deflator used to convert nominal GDP into real GDP.
It excluded exports. The WPI did not capture prices of goods produced for export, even though exports form a significant part of India’s production. This meant the index missed an entire category of producer prices.
It was not internationally comparable. India was one of the last G20 economies still using the WPI as a primary wholesale measure. The IMF’s System of National Accounts 2008 (SNA 2008), the internationally accepted framework for economic statistics, recommends PPI as the appropriate deflator for production-stage activity.
| Limitation | WPI | PPI |
|---|---|---|
| Services coverage | Not covered | Covered (via Services PPI) |
| Double counting | Yes, intermediate goods counted multiple times | No, single count at first sale |
| Export prices | Excluded | Included in Output PPI |
| International comparability | Low; India was a G20 outlier | High; aligns with US, EU, China, Japan |
| Tax inclusion | Excludes indirect taxes | Excludes indirect taxes (same) |
The Three Components of PPI
India’s PPI framework comprises three distinct indices, each designed to track price movements at a different stage of the production cycle.
Output PPI (OPPI) measures the prices that producers receive for their goods at the first point of sale. It is compiled monthly and covers all goods and tradeable services. The Output PPI is the index that will directly replace the WPI as the primary deflator for GDP. In June 2026, the Output PPI inflation stood at 9.57%, compared to the WPI inflation of 9.87%.
Input PPI (IPPI) measures the prices that producers pay for their inputs, such as raw materials, energy, and semi-finished goods. It is currently limited to the manufacturing sector and is being published on a trial basis since March 2026. Once fully developed, the Input PPI will allow policymakers to track cost pressures building up in the production chain before they reach consumers.
Services PPI (SPPI) is India’s first-ever price index for the services sector. Launched in Phase 1 with seven service categories, it includes banking, securities transactions, insurance, management of pension funds, railways, air passenger transport, and telecom. The SPPI is compiled on a quarterly basis and will be expanded to more services in subsequent phases, including healthcare, education, and IT services.
These three indices together provide a complete picture of price movements across the entire production chain, from raw material procurement to final output, across both goods and services.
How PPI Will Improve GDP Estimates
The GDP deflator is a broad measure of inflation used to convert nominal GDP, which is measured at current market prices, into real GDP, which reflects actual changes in output after removing the effect of price changes. The formula is:
Real GDP = (Nominal GDP / GDP Deflator) x 100
The accuracy of the GDP deflator depends directly on the quality of the price indices used in its calculation. In the old GDP series, MoSPI used the single deflation method, which used the WPI for both output and input price adjustment in most sectors. This method drew significant criticism from economists for distorting real growth estimates, particularly during periods of high input price volatility.
In the new GDP series, which revised the base year to 2022-23 earlier this year, MoSPI adopted double deflation in sectors such as manufacturing and agriculture. Double deflation separately adjusts output prices and input prices using distinct indices, leading to a more accurate measurement of real value added. The WPI was still being used in parts of this process, but its replacement by the Output PPI eliminates the remaining distortions.
The PPI is a better deflator than WPI for three reasons. First, it covers services, which WPI entirely missed. Second, by eliminating double counting of intermediate goods, it provides a truer measure of price changes at the production stage. Third, it aligns with the SNA 2008 framework, making India’s GDP data more comparable with global standards.
Economists do not expect a major shift in India’s GDP growth rate from this change, at least in the short term. The Output PPI and WPI have moved closely together since the new series was introduced, with only a narrow gap between them in recent months. However, the structural improvement in measurement quality is significant and will make India’s national accounts more credible internationally.
The Transition Roadmap
The government has laid out a phased transition plan spanning approximately five years, during which both WPI and PPI will be published simultaneously before the WPI is eventually phased out.
| Phase | Timeline | Key Actions |
|---|---|---|
| Phase 1 Launch | June 15, 2026 | Revised WPI (base 2022-23) and three PPI indices released together; back series from April 2023 provided |
| Phase 2 Expansion | 2026-27 | Services PPI expanded beyond 7 services; Input PPI extended beyond manufacturing to mining and construction |
| Phase 3 Deepening | 2027-28 | Full Input PPI across all sectors; regional-level PPI estimates for major states |
| Phase 4 Consolidation | 2028-29 | PPI becomes primary wholesale price indicator in government documents, Economic Survey, and Budget |
| Phase 5 Phase Out | 2029-31 | WPI formally discontinued; PPI becomes the sole producer-level price measure |
During this transition, businesses and government agencies that currently use WPI for contractual indexation, cost escalation clauses, and long-term supply agreements will need to recalibrate their contracts to reference PPI. The five-year window provides adequate time for this adjustment.
MoSPI’s adoption of PPI completes a broader statistical overhaul that began earlier in 2026. The base year for GDP and the Index of Industrial Production (IIP) has been updated to 2022-23, and a new Index of Services Production (ISP) has been introduced. The PPI transition brings India’s price measurement framework in line with these improvements, creating a fully coherent statistical architecture for the first time.
Key Takeaways
- The Producer Price Index (PPI) measures prices received by producers at the point of first commercial sale, excluding taxes and distribution margins.
- MoSPI will replace the Wholesale Price Index (WPI) with the Output PPI as the deflator for quarterly and annual GDP estimates.
- The PPI was launched on June 15, 2026, with a 2022-23 base year, compiled by the Office of the Economic Adviser under DPIIT.
- The PPI framework has three components: Output PPI (monthly), Input PPI (trial, manufacturing only), and Services PPI (quarterly, covering seven sectors).
- WPI suffered from four structural flaws: exclusion of services, double counting of intermediate goods, exclusion of exports, and lack of international comparability with SNA 2008 standards.
- The transition will take place over five years, with WPI and PPI published simultaneously until the WPI is phased out between 2029 and 2031.
