Ministry of Statistics and Programme Implementation is in process of revising base year of Index of Industrial Production from 2011-12 to 2022-23

1. At a Glance

• MoSPI is revising the base year of the Index of Industrial Production (IIP) from 2011-12 to 2022-23, alongside parallel revisions of GDP and CPI base years. [S1][S3]
• Exercise updates methodology, item basket, weights, data sources, and factory list, and introduces a chain-linked index alongside the existing fixed-base index. [S1][S2]
• UPSC-relevant because IIP is a lead indicator of industrial growth, feeds into GDP estimation, and reflects India's transition to internationally accepted statistical standards. [S1][S4]

2. Why in the News

• 16 March 2026 PIB release confirmed MoSPI's ongoing base-year revision of IIP to 2022-23 and constitution of a Technical Advisory Committee (TAC). [S1]
• Forms part of a comprehensive base-year overhaul announced by MoSPI covering GDP, IIP and CPI, with new series releases scheduled — CPI on 12 Feb 2026, GDP on 27 Feb 2026, IIP in May 2026. [S3]
• TAC has held 11 meetings, 3 stakeholder meetings, 3 public discussion papers before finalising recommendations. [S2][S3]

3. Background & Evolution

• IIP first published in India by the Office of the Economic Adviser, Ministry of Commerce & Industry; compilation later shifted to CSO (now NSO) under MoSPI. [S4]
• Base-year revisions: 1937 → 1946 → 1951 → 1956 → 1960 → 1970 → 1980-81 → 1993-94 → 2004-05 → 2011-12 (current) → 2022-23 (proposed). [S4]
• 2011-12 series released in May 2017, replacing the 2004-05 series. [S4]

4. Core Static Facts

• Implementing body: National Statistical Office (NSO), MoSPI; frequency: monthly, released ~42 days after reference month. [S4]
• Current (2011-12) coverage: 839 items / 407 item groups across three sectors. [S5]
• Sectoral weights (2011-12): Manufacturing 77.63%, Mining 14.37%, Electricity 7.99% (residual). [S5]
• Item-selection rule: items representing at least 80% of output within each 3-digit NIC-2008 industry. [S5]
• Classification used: National Industrial Classification (NIC) 2008, aligned with ISIC Rev. 4. [S5]
• Use-based classification (UBC): Primary, Capital, Intermediate, Infrastructure/Construction, Consumer Durables, Consumer Non-Durables. [S4]
• Eight Core Industries (compiled separately by Office of Economic Adviser, DPIIT): coal, crude oil, natural gas, refinery products, fertilizers, steel, cement, electricity — 40.27% weight in IIP. [S4]
• Key reform in new series: introduction of chain-linked index + substitution/augmentation of factories. [S2]

5. Multi-Dimensional Analysis

Economic - More accurate capture of post-pandemic industrial composition, services-linked manufacturing, and emerging sectors (electronics, EVs, renewables). [S1][S2] - Better alignment with revised GDP series (2022-23 base), improving consistency of national accounts. [S3]

Scientific / Statistical - Adoption of chain-linking (annually updated weights) mitigates substitution bias inherent in fixed-base Laspeyres indices — aligns with OECD/UN SNA 2008 practice. [S2] - Updated frame from Annual Survey of Industries (ASI) 2022-23 and refreshed factory panel. [S1][S2]

Administrative / Governance - TAC mechanism ensures expert + stakeholder consultation; 3 discussion papers in public domain reflect transparency. [S2] - Coordination across MoSPI, DPIIT, line ministries, State DESs for data supply. [S1]

Geopolitical / Comparative - Periodic rebasing keeps India's statistics comparable internationally and credible to IMF SDDS, World Bank users. [S2]

6. Recent Developments (last 12-18 months)

• 2025: MoSPI announces comprehensive base-revision exercise for GDP, IIP, CPI. [S3]
• 2025-26: TAC on IIP submits report recommending chain-linked index + factory frame refresh. [S2]
• 12 Feb 2026: New CPI series scheduled. [S3]
• 27 Feb 2026: New GDP series (base 2022-23) scheduled. [S3]
• 16 March 2026: PIB release reaffirms IIP revision in progress. [S1]
• May 2026: Target release of new IIP series. [S3]

7. Prelims Hooks

• Current IIP base year: 2011-12; proposed: 2022-23. [S1]
• Compiling agency: National Statistical Office (NSO), MoSPI — not RBI or DPIIT. [S4]
• IIP sectors: Mining, Manufacturing, Electricity (only three). [S5]
• Sectoral weights (2011-12 series): Mining 14.37, Manufacturing 77.63, Electricity 7.99. [S5]
• Items in current basket: 839 items / 407 groups. [S5]
• Classification base: NIC-2008 aligned with ISIC Rev. 4. [S5]
• Eight Core Industries weight in IIP: 40.27%; compiled by Office of Economic Adviser, DPIIT (not MoSPI). [S4]
• New series will introduce a chain-linked index in addition to fixed-base index. [S2]
• IIP is a monthly index released with a ~42-day lag. [S4]
• New base-year releases scheduled: CPI – Feb 12, 2026; GDP – Feb 27, 2026; IIP – May 2026. [S3]
• Use-Based Classification has 6 categories including Primary, Capital, Intermediate, Infrastructure, Consumer Durables, Consumer Non-Durables. [S4]
• ASI used as a key frame for factory list and weights. [S5]

8. Mains Relevance

• GS-III — Indian Economy: Growth, Development, Industrial Policy; Statistical infrastructure.
• GS-II — Government policies/Institutions (MoSPI, NSO).
• Possible question stems:
• "Periodic revision of statistical base years is essential for credible economic policy. Discuss with reference to the proposed 2022-23 base year for IIP, GDP and CPI."
• "What is a chain-linked index? How does its introduction in the new IIP series improve measurement of India's industrial output?"
• "Examine the limitations of India's current Index of Industrial Production and assess the reforms proposed by the Technical Advisory Committee."

9. Related Topics to Study Next

• GDP base-year revision (2022-23) — parallel exercise by NSO.
• CPI base-year revision — uses Household Consumption Expenditure Survey (HCES) 2022-23.
• Eight Core Industries / ICI — DPIIT, 40.27% of IIP.
• Annual Survey of Industries (ASI) — provides factory frame and GVA weights.
• National Statistical Commission (Rangarajan, 2005) — governance of official statistics.
• NIC-2008 & ISIC Rev. 4 — classification backbone.
• PMI (Purchasing Managers' Index) — private alternative indicator (S&P Global).
• Wholesale Price Index (WPI) — Office of Economic Adviser, parallel base-year revision.

10. Common Errors / Trap Areas

• IIP is compiled by MoSPI/NSO, not RBI or DPIIT; but Eight Core Industries are compiled by DPIIT.
• IIP covers only Mining, Manufacturing, Electricity — construction and services are excluded.
• Manufacturing weight ≈ 77.6%, not "above 80%".
• Current base is 2011-12 (not 2012-13 or 2011); new is 2022-23.
• Chain-linked ≠ replacement of fixed-base index — both will coexist.
• IIP base year ≠ GDP base year historically, though now being aligned to 2022-23.

11. Sources

• [S1] Press Release: MoSPI revising IIP base year from 2011-12 to 2022-23 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2240624 — (tier 1)
• [S2] Report of the Technical Advisory Committee on Base Year Revision of IIP — https://www.mospi.gov.in/uploads/documents/documents/1779702577643-Report_of_TAC_IIP_Final.pdf — (tier 1)
• [S3] Release schedule of new GDP, CPI and IIP series — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2226269 — (tier 1)
• [S4] IIP Background, MoSPI — https://mospi.gov.in/iipbackground — (tier 1)
• [S5] IIP with Base 2011-12 — An Overview (MoSPI Manual) — https://www.mospi.gov.in/sites/default/files/publication_reports/IIP_Manual_3apr18N1.pdf — (tier 1)