Ministry of Statistics & Programme Implementation (MoSPI) revised base year of the Consumer Price Index from 2012=100 to 2024=100

1. At a Glance

• MoSPI shifted CPI base year from 2012=100 to 2024=100; revised series released 12 February 2026 [S1].
• Basket/weights now derived from Household Consumption Expenditure Survey (HCES) 2023-24, replacing decade-old 2011-12 consumption data [S3].
• Adopts COICOP 2018 international classification; basket expanded to 358 items, capturing new-economy consumption (streaming, e-commerce) [S3].
• Directly relevant for Prelims (index mechanics) and Mains GS-III (inflation measurement, monetary policy inputs).

2. Why in the News

• PIB press release dated 29 July 2026 formally announced the base revision and expanded price-collection network [S1].
• Revised series (2024=100) was released on 12 February 2026, with January 2026 CPI being reported provisionally under new base [S3].
• First inflation print under new series: January 2026 headline CPI inflation at 2.75% (Rural 2.73%, Urban 2.77%) [S3].

3. Background & Evolution

• Previous CPI series (2012=100, base year 2011-12 consumption pattern) had served as principal retail inflation gauge for over a decade [S3].
• Structural economy changes since 2012 — urbanisation, rising incomes, services sector growth, digitalisation — necessitated basket/weight revision [S3].
• New basket and weights drawn from HCES 2023-24 (successor to the 2011-12 Consumer Expenditure Survey) [S3].
• Revised series released 12 February 2026; monthly price collection network subsequently expanded per PIB release of 29 July 2026 [S1].

4. Core Static Facts

• Nodal Ministry: Ministry of Statistics & Programme Implementation (MoSPI) [S1].
• New base year: 2024=100 (replaces 2012=100) [S1].
• Release date of revised series: 12 February 2026 [S1].
• Weight/basket source: HCES 2023-24 [S3].
• Classification framework: COICOP 2018 (Classification of Individual Consumption by Purpose) [S3].
• Basket size: 358 items at All India level (expanded from previous series) [S3].
• Price collection coverage (per 29 July 2026 PIB release):
• Rural markets: 1,465 [S1]
• Urban markets: 1,395 across 434 towns [S1]
• 12 online markets added across 12 towns (population >25 lakh each) to capture e-commerce/online platform prices [S1].
• First reported inflation figure under new base: January 2026, All India 2.75% (Rural 2.73%, Urban 2.77%) [S3].

5. Multi-Dimensional Analysis

Economic - More representative CPI improves accuracy of RBI's inflation-targeting framework (CPI is the anchor for monetary policy under flexible inflation targeting) [S3]. - Updated weights reduce distortion from outdated 2011-12 consumption shares (e.g., under-representation of services, digital spends) [S3].

Administrative - Expanded geographic footprint (1,465 rural + 1,395 urban markets across 434 towns) improves granularity of price collection [S1]. - New online-market component (12 towns, population >25 lakh) is a first-of-its-kind addition to capture e-commerce price trends [S1].

Scientific/Technological - Shift to COICOP 2018 aligns India's CPI methodology with international statistical standards, aiding cross-country comparability [S3]. - Basket expansion to 358 items reflects methodological modernisation (inclusion of streaming services, changed housing patterns) [S3].

Governance - Periodic base revision (2012 → 2024, a 12-year gap) reflects standard statistical practice of keeping index baskets current; delayed revisions risk misrepresenting real inflation experienced by households [S3].

6. Recent Developments (last 12-18 months)

• 12 February 2026: MoSPI released new CPI series with base 2024=100 [S3].
• January 2026: First provisional inflation reading under new series — 2.75% All India [S3].
• 29 July 2026: PIB release detailing expanded monthly price collection — 1,465 rural + 1,395 urban markets (434 towns) + 12 online markets [S1].

7. Prelims Hooks

• CPI base year revised from 2012=100 to 2024=100 by MoSPI [S1].
• Revised CPI series released on 12 February 2026 [S1].
• New basket/weights based on HCES 2023-24, not the earlier Consumer Expenditure Survey [S3].
• New series basket size: 358 items (All India) [S3].
• Classification framework used: COICOP 2018 [S3].
• Rural markets under new series: 1,465 [S1].
• Urban markets under new series: 1,395, spread across 434 towns [S1].
• 12 online markets added across 12 towns with population exceeding 25 lakh, to track e-commerce/online platform prices — first such addition [S1].
• January 2026 provisional All India CPI inflation under new series: 2.75% [S3].
• Rural inflation (Jan 2026): 2.73%; Urban inflation: 2.77% [S3].
• Implementing/nodal body: Ministry of Statistics & Programme Implementation (MoSPI), not RBI (RBI only uses CPI as policy target, doesn't compile it) [S1].
• Previous base year (2012=100) had stood for over a decade before this revision [S3].

8. Mains Relevance

• GS-III: Indian Economy — Inflation, Statistics, Indices; growth & development indicators.
• GS-II (tangential): Governance — role of statistical bodies in policy-making, transparency of official data.
• Possible question stems:
• "Discuss the rationale behind periodic revision of CPI base year. How does the 2024=100 series improve inflation measurement in India?"
• "Examine the significance of incorporating e-commerce price data and HCES 2023-24 in India's revised CPI series."
• "CPI is central to India's inflation-targeting monetary policy framework. Analyse how outdated base years can distort policy outcomes."

9. Related Topics to Study Next

• Household Consumption Expenditure Survey (HCES) 2023-24 — direct data source for new CPI weights.
• Wholesale Price Index (WPI) — parallel inflation measure, different base year/methodology, compare coverage.
• RBI Flexible Inflation Targeting (FIT) framework — CPI is the target variable (4% ± 2% band).
• Index of Industrial Production (IIP) — another MoSPI-compiled index, similar base-revision logic.
• GDP base year revision — parallel exercise of updating national accounts base year, often discussed together.
• COICOP classification — international standard now adopted; useful for understanding statistical harmonisation.
• Monetary Policy Committee (MPC) — uses CPI inflation as primary policy input.

10. Common Errors / Trap Areas

• Confusing CPI (MoSPI, retail inflation, RBI policy anchor) with WPI (Ministry of Commerce & Industry, wholesale prices) — different ministries, different base years.
• Assuming RBI compiles CPI — it does not; MoSPI is the compiling authority, RBI only targets it.
• Mixing up release date of the PIB announcement (29 July 2026) with the actual series release date (12 February 2026) — the PIB release covers expanded market coverage, not the initial base launch.
• Confusing HCES 2023-24 (new weight source) with the older Consumer Expenditure Survey rounds.
• Misremembering basket size — 358 items under new 2024=100 series (verify against final MoSPI notification for exact figure, as some secondary sources cite slightly different counts).

11. Sources

• [S1] Ministry of Statistics & Programme Implementation revised base year of the CPI from 2012=100 to 2024=100 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2291051 — (tier: 1)
• [S3] Frequently Asked Questions (FAQs) on CPI 2024 Series, Annexure V — https://www.mospi.gov.in/uploads/documents/documents/1770891066052-Annexure_V.pdf — (tier: 1)