PROVISIONAL ESTIMATES OF WHOLESALE PRICE INDEX, OUTPUT PRODUCER PRICE INDEX, AND TRIAL INPUT PRODUCER PRICE INDEX FOR THE MONTH OF JUNE 2026, AND FINAL ESTIMATES FOR THE MONTH OF APRIL 2026

Now I have enough grounded facts to write the note.

WPI, Output PPI & Trial Input PPI — June 2026 (Provisional) / April 2026 (Final)

1. At a Glance

Wholesale Price Index (WPI) tracks price changes at the wholesale/producer level (before retail markup), released monthly by the Office of Economic Adviser (OEA), Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce & Industry [S1].
India is mid-transition from the old WPI Base 2011-12 series to a new Base 2022-23 series, alongside newly introduced Producer Price Indices (PPI) — a structural reform aspirants must track for both Prelims trivia and Mains policy-analysis angles [S2][S3].
June 2026 data shows WPI inflation rising to 9.87% YoY (from 9.68% in May 2026), with Fuel & Power as the dominant driver at 27.41% [S1].
Relevant for GS-III (inflation indices, monetary/fiscal policy inputs) and Prelims (index construction, base years, releasing authority).

2. Why in the News

Provisional WPI/OPPI/trial IPPI for June 2026 and final estimates for April 2026 released by PIB Delhi on 14 July 2026 [S1].
This release comes soon after India's base-year revision — the new WPI (2022-23) series, replacing WPI (2011-12), was formally released from 15 June 2026 [S2][S3].

3. Background & Evolution

WPI base year revisions (historical trajectory): 2004-05 → 2011-12 (approved 2015-16) → 2011-12 → 2022-23 (approved by competent authority on 25.05.2026) [S3].
New series (Base 2022-23) released by OEA, DPIIT effective 15.06.2026, 12:00 noon, replacing the 2011-12 series [S2][S3].
Alongside the revised WPI, OEA introduced new Producer Price Indices (PPI): Output PPI (OPPI), Trial Input PPI (IPPI), and Service PPI, all with base year 2022-23 [S2].
Trial Input PPI (Manufacturing sector only) has been published on an experimental basis from March 2026 onwards, to let the Department examine data quality and gather stakeholder feedback before formal launch [S2].
Transition plan: the old WPI (2011-12) series will run in parallel for 5 years from the new release date before being discontinued, to allow users time to migrate to PPI [S3].
Release schedule institutionalised: Provisional WPI/OPPI/trial IPPI for a reference month released on the 14th of the following month (or next working day) [S2].

4. Core Static Facts

Item	Detail
Compiling/releasing body	Office of Economic Adviser (OEA), DPIIT, Ministry of Commerce & Industry [S1][S2]
Current WPI base year	2022-23 (=100), replacing 2011-12 [S2][S3]
New indices introduced	Output PPI (OPPI), trial Input PPI (IPPI, manufacturing only), Service PPI [S2]
Weighting basis (new series)	Gross Value of Output (GVO), vs Net Traded Value earlier [S3]
Elementary index method	Short-term formulation, chain-based method (vs long-term formulation earlier) [S3]
Missing-data imputation	"Targeted Mean Imputation" method (vs "Carry-forward" method earlier) [S3]
June 2026 All-India WPI (provisional)	Index = 110.2; YoY inflation = 9.87% [S1]
May 2026 All-India WPI	Index = 109.9; YoY inflation = 9.68% [S1]
Group-wise YoY inflation, June 2026	Primary Articles: 7.0%; Fuel & Power: 27.41%; Manufactured Products: 7.48% [S1]
Group-wise YoY inflation, May 2026	Primary Articles: 4.99%; Fuel & Power: 30.33%; Manufactured Products: 7.48% [S1]
Release cadence	14th of following month (or next working day) [S2]
Parallel-run period	Old 2011-12 series continues for 5 years post new-series release [S3]

5. Multi-Dimensional Analysis

Economic
WPI feeds into GDP deflator estimation, tracks producer-side inflationary pressure distinct from consumer-facing CPI [S1].
Persistently elevated Fuel & Power inflation (27.41%) signals energy-cost pass-through risk to downstream manufacturing and transport costs [S1].
Introduction of Output vs Input PPI allows better tracking of how input-cost inflation is (or isn't) passed on to output prices — key for assessing corporate margin pressure and monetary policy transmission [S2].
Administrative/Governance
Methodological shift to GVO-based weights and chain-based elementary indices aligns India's WPI compilation closer to international best practice (recommended by index-methodology bodies) [S3].
Running a 5-year parallel series reflects a calibrated, non-disruptive transition strategy — balancing continuity for users (RBI, industry, contract escalation clauses) against methodological modernisation [S3].
Scientific/Technological (Statistical Methodology)
Targeted Mean Imputation replacing "Carry-forward" imputation improves handling of missing price observations — a subtle but testable methodological upgrade [S3].
Trial/experimental publication of Input PPI (from March 2026) is a deliberate data-quality validation phase before full-fledged rollout [S2].
Historical
Third base-year revision cycle for WPI in the post-liberalisation era (1993-94 → 2004-05 → 2011-12 → 2022-23), reflecting periodic structural updates to capture economic composition changes [S3].

6. Recent Developments (last 12-18 months)

25.05.2026: Competent authority approves revision of WPI base year to 2022-23 and introduction of PPIs [S3].
March 2026: Trial Input PPI (Manufacturing) begins experimental monthly publication [S2].
15.06.2026, 12:00 noon: New WPI series (Base 2022-23), Output PPI, and trial Input PPI formally released, replacing WPI (2011-12) [S2][S3].
14.07.2026: Provisional WPI/OPPI/trial IPPI for June 2026 and final estimates for April 2026 released [S1].

7. Prelims Hooks

WPI is compiled and released by the Office of Economic Adviser, DPIIT, Ministry of Commerce & Industry — not RBI or MoSPI [S1][S2].
Current WPI base year: 2022-23 (revised from 2011-12) [S2].
Base-year revision approved by competent authority on 25 May 2026 [S3].
New WPI (2022-23) series formally launched on 15 June 2026 [S3].
Old WPI (2011-12) series will run parallel for 5 years before discontinuation [S3].
New weighting method uses Gross Value of Output (GVO), replacing Net Traded Value [S3].
New elementary indices use a chain-based, short-term formulation method [S3].
Missing price data now handled via "Targeted Mean Imputation", replacing "Carry-forward" method [S3].
Trial Input Producer Price Index (IPPI) covers only the Manufacturing sector, published experimentally since March 2026 [S2].
Alongside OPPI and IPPI, a Service PPI has also been introduced (base 2022-23) [S2].
Provisional monthly indices are released on the 14th of the following month [S2].
All-India WPI index value for June 2026: 110.2 (May 2026: 109.9) [S1].
WPI inflation June 2026: 9.87% YoY; May 2026: 9.68% YoY [S1].
Fuel & Power group recorded highest YoY inflation among the three major groups in June 2026 at 27.41% [S1].
Three major WPI groups: Primary Articles, Fuel & Power, Manufactured Products [S1].

8. Mains Relevance

GS-III: Indian Economy — Inflation, Price Indices (WPI vs CPI), Growth & Development, Government Budgeting/monetary policy inputs.
GS-II (tangentially): Statistical governance and institutional reform (methodology transparency, data quality practices).
Possible question stems: 1. "Distinguish between Wholesale Price Index and Producer Price Index. Examine why India is transitioning toward a PPI-based inflation measurement framework." (GS-III) 2. "Discuss the significance of the 2022-23 base-year revision of WPI for macroeconomic policy-making in India." (GS-III) 3. "Rising fuel and power inflation poses a distinct challenge from broader wholesale inflation. Analyse its implications for India's monetary policy transmission." (GS-III)

9. Related Topics to Study Next

Consumer Price Index (CPI) & Combined CPI (base 2012) — contrast with WPI; used for RBI's inflation targeting under the Monetary Policy Framework.
RBI Monetary Policy Committee (MPC) & Flexible Inflation Targeting — CPI (not WPI) is the RBI's formal inflation anchor; WPI/PPI matter for corporate/producer-side signals.
Index of Industrial Production (IIP) — parallel real-sector indicator also released by NSO/MoSPI, useful comparative context [related PIB release found: IIP growth 5.1% in May 2026].
GDP Deflator — WPI/PPI data feeds into deflator estimation for real GDP calculation.
National Statistical Office (NSO) & MoSPI vs DPIIT's OEA — clarify institutional division: CPI/IIP (MoSPI) vs WPI/PPI (DPIIT).
Producer Price Index methodology internationally (ILO/IMF guidance) — for comparative/international-best-practice angle in Mains answers.
Crude oil price volatility & India's energy import dependence — directly explains persistent high Fuel & Power WPI inflation.

10. Common Errors / Trap Areas

Confusing releasing authority: WPI/PPI is released by OEA, DPIIT (Ministry of Commerce & Industry), NOT MoSPI (which handles CPI and IIP) — a classic Prelims trap.
Assuming WPI is India's official inflation-targeting metric — it is CPI (Combined) that RBI's MPC targets, not WPI.
Mixing up base years: current live base is 2022-23, but the old 2011-12 series continues in parallel for 5 years — don't assume immediate discontinuation.
Confusing Output PPI (price received by producer) with Input PPI (price paid by producer for inputs) — the trial IPPI is currently manufacturing-sector only, not economy-wide.
Treating "trial"/"experimental" Input PPI figures as final, official statistics — they are explicitly for data-quality testing and feedback, not final published inflation numbers.

11. Sources

[S1] Provisional Estimates of Wholesale Price Index (Base Year 2022-23) for the month of June 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2284374 — (tier: 1)
[S2] Press Release on New Series of Wholesale Price Index, and Producer Price Indices with Base Year 2022-23 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2272872 — (tier: 1)
[S3] Base Year of Wholesale Price Index Revised from 2011–12 to 2022–23 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2267963 — (tier: 1)