Index Numbers of Wholesale Price in India for the Month of January, 2026 (Base Year: 2011-12)

1. At a Glance

WPI is India's headline wholesale-stage inflation gauge, compiled monthly by the Office of the Economic Adviser (OEA), DPIIT, Ministry of Commerce & Industry [S1][S3].
For January 2026, headline WPI inflation came in at 1.81% (provisional) YoY — third consecutive monthly rise after -0.13% in Nov-25 and 0.83% in Dec-25 [S1].
UPSC relevance: pairs with CPI for Prelims (Economy) and GS-3 (Inflation, Monetary Policy); tests base-year, weights, ministry, and component composition.

2. Why in the News

PIB release dated 16 Feb 2026 reported January 2026 provisional WPI inflation at 1.81%, up from 0.83% in December 2025, signalling a re-accelerating wholesale price trend [S1].
Drivers cited: basic metals, other manufacturing, non-food articles, food articles and textiles [S1].

3. Background & Evolution

WPI series in India dates back to week ending 10 January 1942 (base 1939); successive base revisions — 1952-53, 1961-62, 1970-71, 1981-82, 1993-94, 2004-05, and current 2011-12 [S2][S3].
Base revised from 2004-05 → 2011-12 on 12 May 2017 following recommendations of the Saumitra Chaudhuri Working Group [S2].
2017 revision: dropped indirect taxes (to align with international SNA / producer-price norms), added new commodities (basket expanded to 697 items), and introduced a separate WPI Food Index [S2][S3].

4. Core Static Facts

Compiling agency: Office of the Economic Adviser (OEA), Department for Promotion of Industry and Internal Trade (DPIIT), Ministry of Commerce & Industry [S3].
Base year: 2011-12 = 100 [S1][S3].
Release frequency: Monthly, on the 14th of every month (next working day if holiday); revised after 10 weeks (final) [S3].
Commodity basket: 697 items [S3].
Major group weights:
Primary Articles — 22.62%
Fuel & Power — 13.15%
Manufactured Products — 64.23%
WPI Food Index (derived) — 24.38% [S1][S3].
January 2026 indices (provisional): All-Commodities 157.8; Primary Articles 193.9 (2.21%); Fuel & Power data partly truncated in excerpt; figures supersede prior Nov-25 (F) 156.2 / Dec-25 (P) 157.0 [S1].

5. Multi-Dimensional Analysis

Economic - WPI is the GDP deflator input for manufacturing & sectors lacking direct producer-price data; movement at 1.81% suggests mild reflation [S1]. - Divergence from CPI (consumer-stage, food-heavy) explains why RBI's MPC uses CPI as the nominal anchor under the Flexible Inflation Targeting framework, while WPI informs producer cost dynamics.

Administrative - Data collection: Ministry of Agriculture & FW + National Horticulture Board (food articles); MoPNG + OMCs (mineral oils); CEA (electricity); Coal India Ltd (coal); private manufacturers for manufactured items [S3].

Methodological / Statistical - Uses Modified Laspeyres formula; weights are based on net traded value at the wholesale stage; excludes services and excludes indirect taxes post 2017 revision [S2][S3].

Governance - WPI is not under MoSPI (CPI is) — a classic UPSC trap. Both are official inflation series but under different ministries.

6. Recent Developments (last 12-18 months)

Jan 2026 (P): 1.81% YoY [S1].
Dec 2025 (P): 0.83%; Nov 2025 (F): -0.13% — i.e., wholesale deflation in Nov-25 [S1].
Subsequent releases for Feb 2026 (PRID 2240515) and Mar 2026 (PRID 2252109) issued in normal monthly cadence [S4][S5].
Working group on base revision to 2017-18 (Ramesh Chand Committee) recommendations under consideration to introduce Producer Price Index (PPI) and update basket (pre-existing policy direction).

7. Prelims Hooks

WPI base year currently in use: 2011-12 [S1].
WPI is released by Office of the Economic Adviser, DPIIT — NOT MoSPI / NSO [S3].
Number of items in WPI basket: 697 [S3].
Major group weights: Primary 22.62 / Fuel & Power 13.15 / Manufactured 64.23 [S1][S3].
WPI Food Index weight: 24.38% (combines Food Articles + Food Products) [S3].
WPI excludes services and indirect taxes (post 2017 revision) [S2].
Formula used: Modified Laspeyres [S3].
Last base-year change notified on 12 May 2017 by DIPP (now DPIIT) [S2].
January 2026 WPI inflation: 1.81% (provisional) [S1].
Primary Articles index for January 2026: 193.9, inflation 2.21% [S1].
Final WPI revision occurs after 10 weeks of provisional release [S3].
Saumitra Chaudhuri Working Group → 2011-12 series; basket expanded from 676 → 697 [S2].

8. Mains Relevance

GS-3: Indian Economy — Growth, Development, Inflation; Monetary policy and price stability.
Possible stems: 1. "Discuss the rationale behind shifting WPI base to 2011-12 and excluding indirect taxes. How does this align India with international best practices on producer prices?" 2. "WPI and CPI often diverge sharply in India. Examine the structural reasons and the implications for RBI's monetary policy framework." 3. "A Producer Price Index (PPI) is overdue for India. Critically evaluate."

9. Related Topics to Study Next

CPI (Combined, Rural, Urban) — MoSPI's NSO compiles; FIT anchor at 4±2%.
Flexible Inflation Targeting & MPC — RBI Act amendment 2016.
GDP Deflator — uses WPI as proxy for several sectors.
Producer Price Index (PPI) — Ramesh Chand Committee recommendation.
Index of Industrial Production (IIP) — base 2011-12; companion macro series.
Core inflation & food inflation dynamics — WPI Food Index linkage.
Saumitra Chaudhuri / Ramesh Chand committees — base revision history.
DPIIT — its broader mandate beyond WPI (Startup India, FDI policy).

10. Common Errors / Trap Areas

Confusing compiling agency: WPI = DPIIT/OEA; CPI = NSO/MoSPI. Aspirants frequently swap them.
Assuming WPI covers services — it does not; only goods at wholesale stage.
Forgetting that indirect taxes were removed in the 2011-12 series — a key 2017 change.
Treating WPI as RBI's policy anchor — RBI uses CPI-Combined, not WPI.
Mixing weights with the older 2004-05 series (Primary 20.12, Fuel 14.91, Manufactured 64.97 → not current).

11. Sources

[S1] Index Numbers of Wholesale Price in India for January 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2228577 — (tier 1)
[S2] Revision of base year of WPI from 2004-05 to 2011-12 (PIB, 12 May 2017) — https://www.pib.gov.in/newsite/printrelease.aspx?relid=161741 — (tier 1)
[S3] Manual on Wholesale Price Index (Base 2011-12 = 100), Office of the Economic Adviser — https://eaindustry.nic.in/uploaded_files/WPI_Manual.pdf — (tier 1)
[S4] WPI February 2026 release — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2240515 — (tier 1)
[S5] WPI March 2026 release — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2252109 — (tier 1)