Press note on release of the Report of the Technical Advisory Committee on Base Year Revision of the All-India Index of Industrial Production from 2011-12 to 2022-23

1. At a Glance

• MoSPI released the Report of the Technical Advisory Committee on Base Year Revision of the All-India Index of Industrial Production (TAC-IIP) on 25 May 2026 [1].
• The exercise revises IIP's base year from 2011-12 to 2022-23, aligning it with GDP, CPI, and WPI base-year cycles [1][2].
• Introduces India's first chain-linked IIP alongside the traditional fixed-base index — a major methodological shift [1][2].
• Relevant for Prelims (static facts on economic indices) and Mains GS-III (statistics, economy, indicators of industrial growth).

2. Why in the News

• TAC-IIP report released via PIB press note dated 25 May 2026 [1].
• First release of the revised IIP series (new base year 2022-23) scheduled for 1 June 2026, providing index values from April 2023 onward, including Quick Estimates for April 2026 [2].

3. Background & Evolution

• IIP base years have been periodically revised: 2004-05 → 2011-12 was the previous revision [S1 context, related PIB releases].
• MoSPI decided on a comprehensive exercise to simultaneously revise base years of GDP, IIP, and CPI [S1 related release].
• TAC-IIP constituted in September 2024 under chairmanship of Dr. Mridul K. Saggar, Professor, IIM Kozhikode [1].
• Committee comprised experts from leading academic institutions, chief economists, and senior officials from Government of India and State Directorates of Economics and Statistics (DESs) [1].
• TAC held 11 meetings, 3 stakeholder meetings, and released 3 discussion papers in the public domain for structured feedback [1].

4. Core Static Facts

5. Multi-Dimensional Analysis

Economic

• Rebasing aligns IIP with GDP/CPI/WPI base years, improving cross-indicator comparability for policy formulation (RBI monetary policy, industrial growth tracking) [1].
• Chain-linking with annual weight updates reduces substitution bias, better capturing structural shifts in India's industrial economy [2].

Scientific/Technological (Statistical Methodology)

• Introduction of chain-linked index alongside fixed-base index — a paradigm shift from India's traditional single fixed-base approach [1][2].
• Adoption of Geometric Mean linking method — an internationally recognized best-practice technique [2].

Administrative

• Coverage expansion required substitution and augmentation of factories in the sample frame to address structural changes (new industries, factory closures) [1].
• Involves coordination between MoSPI and State DESs for source data [1].

Governance

• Public discussion papers and stakeholder consultations reflect participatory, transparent statistical rule-making [1].

6. Recent Developments (last 12–18 months)

• September 2024: TAC-IIP constituted under Dr. Mridul K. Saggar [1].
• 2024-25: 11 TAC meetings, 3 stakeholder meetings, 3 public discussion papers released [1].
• 25 May 2026: TAC-IIP Report released by MoSPI [1].
• 1 June 2026 (scheduled): First release of new IIP series with base year 2022-23, effective from April 2023, including Quick Estimates for April 2026 [2].

7. Prelims Hooks

• IIP base year revised from 2011-12 to 2022-23 — most recent revision as of 2026 [1].
• TAC-IIP chaired by Dr. Mridul K. Saggar, Professor at IIM Kozhikode (not RBI, though he has an RBI background) [1].
• TAC-IIP constituted in September 2024 [1].
• Nodal ministry for IIP: Ministry of Statistics and Programme Implementation (MoSPI) [1].
• New IIP item basket: 463 item groups, including 120 new item groups [1].
• New sectors added to IIP coverage: minor minerals, rare earth minerals, gas supply, water supply, sewerage and waste management [1].
• India's IIP will now have two variants: fixed-base index and chain-linked index [1][2].
• Linking method used: Geometric Mean method [2].
• New IIP series first released on 1 June 2026, with data from April 2023 [2].
• Previous IIP base year revision was from 2004-05 to 2011-12 [background, related PIB releases].
• IIP measures short-term changes in volume of industrial production across mining, manufacturing, and electricity sectors (general knowledge, contextual).

8. Mains Relevance

• GS-III: Indian Economy — Statistics, Growth & Development, Industrial Policy; "Indicators of Economic Growth."
• GS-II (tangential): Governance — transparency in statistical institution functioning (MoSPI, TAC consultative process).
• Possible question stems: 1. "Discuss the significance of periodic base-year revision of macroeconomic indices like IIP for evidence-based policymaking in India." (GS-III) 2. "What is a chain-linked index? Examine how its adoption alongside the fixed-base IIP addresses limitations of India's current industrial statistics." (GS-III) 3. "Critically evaluate the challenges in expanding the coverage of India's industrial output index to emerging sectors like rare earth minerals and waste management." (GS-III)

9. Related Topics to Study Next

• Base year revision of GDP and CPI — part of the same comprehensive MoSPI exercise, likely to follow similar TAC-driven methodology [S1 related release].
• Wholesale Price Index (WPI) — another macroeconomic index due for base-year alignment.
• National Statistical Commission (NSC) — apex statistical body overseeing such methodological changes.
• Periodic Labour Force Survey (PLFS) — related MoSPI statistical product, useful for understanding MoSPI's broader data ecosystem.
• Rare earth minerals policy in India — links to new IIP sectoral coverage and India's critical minerals strategy.
• Make in India / National Manufacturing Policy — IIP is the key metric tracking outcomes of industrial policy.
• RBI Monetary Policy Committee's use of IIP — as an input for interest rate decisions.

10. Common Errors / Trap Areas

• Do not confuse TAC-IIP (2024, base year 2011-12→2022-23) with the earlier base year revision (2004-05→2011-12) — different committees, different years.
• IIP is released by MoSPI, not RBI or NSO as a standalone body (NSO functions under MoSPI) — avoid attributing it to the wrong ministry.
• Do not confuse IIP base year revision with GDP base year revision — both are underway under a "comprehensive exercise" but are distinct reports/committees.
• Chain-linked index is an addition to, not a replacement of, the fixed-base index — both will coexist.
• Committee chair Dr. Mridul K. Saggar's affiliation is IIM Kozhikode (current, as Professor) — aspirants may wrongly associate him only with RBI (his prior career).