Moving on

1. At a Glance

• India's Consumer Price Index (CPI), used as the primary headline inflation benchmark and as the anchor for RBI's monetary policy, was operating on a base year of 2012 — over a decade out of date by 2025–26. [1][2]
• The December 2025 CPI print (1.33%) was the final data release under the old 2012-base series, after which MoSPI transitioned to a new series with base year 2024=100, launched on 12 February 2026. [1][2][3]
• UPSC relevance: This topic sits at the intersection of GS-III (Indian Economy — inflation, monetary policy) and GS-II (governance — statistical systems); it tests understanding of index construction, weightage methodology, and the CPI-RBI inflation targeting framework.
• The revision exposes a structural gap between officially reported inflation and household-perceived inflation, a critical governance and credibility issue. [1]

2. Why in the News

• December 2025: MoSPI released the final CPI data under the 2012-base series; inflation stood at 1.33% — a three-month high but simultaneously the third lowest in the entire history of the current series. [1]
• The April–December 2025 average inflation under the old series was 1.7%, sharply lower than the 4.9% average in the same period of 2024 — yet household surveys showed a starkly different picture. [1]
• RBI's Inflation Expectations Survey (December 2025): households perceived inflation at 6.6% and expected it to rise to 7.6% in three months and 8% in a year — a near-5 percentage point divergence from the official 1.33% figure. [1]
• The GDP's first advance estimate for 2025-26 showed private consumption growth slower than 2024-25 — inconsistent with a genuine easing of inflation to 1.7%, signalling data credibility concerns. [1]
• 12 February 2026: MoSPI officially launched the new CPI series (base 2024=100), making the changeover live. [2][3]

3. Background & Evolution

• CPI in India has existed in multiple forms; the All-India CPI (combined rural + urban) series with base 2010=100 was first launched and was later revised to base 2012=100. [4]
• 2012-base CPI has been in use for over a decade, making it one of the longest intervals without a base-year revision in India's statistical history. [1]
• International best practice (and RBI/MoSPI's own commitment) calls for revising the base year every 5 years, a standard India had not followed for the CPI series. [5]
• The Household Consumption Expenditure Survey (HCES) — the foundational data for CPI weightages — was last conducted in 2011-12; the 2017-18 HCES was suppressed (not released officially due to data quality concerns), creating a vacuum in consumption data. [1]
• The HCES 2023-24 was conducted and its results formed the empirical backbone of the new 2024-base CPI series. [2]
• India adopted flexible inflation targeting (FIT) in 2016, with CPI as the nominal anchor; the RBI's mandated target is 4% (±2%) under the RBI Act, 1934 (amended 2016), making accuracy of CPI directly consequential for monetary policy. [4]

4. Core Static Facts

• RBI inflation target: 4% CPI ± 2 percentage points (floor 2%, ceiling 6%), mandated under Section 45ZA of the RBI Act, 1934. [4]
• December 2025 CPI (old series): 1.33% — final print of 2012-base. [1]
• January 2026 CPI (new series): 2.75% (provisional). [3]
• April 2026 CPI (new series): 3.48% (provisional). [3]
• New basket adds modern services such as OTT subscriptions and e-commerce pricing. [2]
• COICOP = Classification of Individual Consumption According to Purpose (UN Statistical Division standard). [2]

5. Multi-Dimensional Analysis

Economic

• The 1.7% average inflation (Apr–Dec 2025) under the old series likely understated true price pressures, contributing to over-optimistic monetary easing signals. [1]
• Lower food weight in the new series means headline CPI will be less volatile (food prices are seasonally erratic); housing, transport, and services will exert greater influence on the headline number. [2]
• The divergence between official CPI and household-perceived inflation (6.6%) may have led to sub-optimal real interest rate calibration by the RBI, with spillover effects on credit growth and savings behaviour. [1]

Governance / Administrative

• The 2017-18 HCES data suppression was a significant governance failure — absence of updated consumption data for 12+ years directly caused the staleness of the 2012-base CPI. [1]
• Commitment to 5-year revision cycles (announced by MoSPI's Saurabh Garg) addresses the structural gap; operationalising this requires timely HCES cycles — itself a governance challenge. [5]
• The gap between statistical agency outputs and ground-level reality erodes public and market trust in official data — a credibility and accountability issue for India's National Statistical Office (NSO). [1]

Legal / Constitutional

• The RBI Act, 1934 (Section 45ZA) mandates the government to set the inflation target in consultation with the RBI; CPI is the legally designated measure. [4]
• Transition to a new CPI series requires the MPC (Monetary Policy Committee) — constituted under Section 45ZB — to potentially re-evaluate its calibration framework. [4]

Social

• Food and beverages have historically carried high weight in CPI (reflecting low-income household spending patterns); a reduction in food weight in the new series may under-represent inflation burden on the poor, who spend a larger share of income on food. [2]
• Household inflation expectations at 6.6–8% (RBI survey, Dec 2025) reflect real consumption stress invisible in official data — relevant to social welfare and anti-poverty policy calibration. [1]

Scientific / Technological

• Adoption of COICOP-2018 (UN standard) aligns India's methodology with global best practices, enabling better cross-country inflation comparisons. [2]
• Inclusion of OTT, e-commerce, digital services in the basket reflects technological evolution in consumption — previously invisible to the 2012-era index. [2]

6. Recent Developments (last 12–18 months)

• January 2026: The Hindu editorial ("Moving On") highlights the credibility gap of the outgoing CPI series, noting the 5 percentage-point divergence between official data and RBI household survey. [1]
• 12 February 2026: MoSPI / NSO officially releases the first CPI print on base 2024=100 — the new series goes live. [2][3]
• February 2026: New basket expanded from 299 → 358 items; COICOP-2018 framework adopted. [2]
• January 2026 CPI (new series): 2.75% (provisional). [3]
• March 2026 CPI (new series): Released via PIB press release. [3]
• April 2026 CPI (new series): 3.48% (provisional). [3]
• August 2025: MoSPI Chief Statistician Saurabh Garg announced the commitment to revise the CPI series every 5 years going forward. [5]
• PIB (2026): MoSPI released a note on "Counting What Counts" — strengthening national accounts and core economic statistics — signalling broader statistical reform. [4]

7. Prelims Hooks (high-density factual bullets)

1. The final CPI data release under the 2012-base series was for December 2025, with a reading of 1.33%. [1]
2. The new CPI series uses base year 2024=100, launched on 12 February 2026 by MoSPI/NSO. [2]
3. The item basket in the new CPI series expanded from 299 items (old) to 358 items (new). [2]
4. The new series is based on HCES 2023-24 (Household Consumption Expenditure Survey); the old series used HCES 2011-12. [2]
5. The new CPI follows the COICOP-2018 (Classification of Individual Consumption According to Purpose) framework of the UN Statistical Division. [2]
6. India's RBI inflation target is 4% ± 2% under Section 45ZA, RBI Act, 1934; CPI is the legally mandated measure. [4]
7. RBI's Household Inflation Expectations Survey (December 2025): perceived inflation at 6.6%; expected to reach 8% in one year — vs. official 1.33%. [1]
8. India's average CPI inflation (April–December 2025) under the old series was 1.7%, vs. 4.9% in the same period of 2024. [1]
9. MoSPI committed to revising the CPI series every 5 years — announced by Saurabh Garg, Chief Statistician (August 2025). [5]
10. The 2017-18 HCES data was not officially released, leaving a ~12-year gap between consumption surveys used in successive CPI series. [1]
11. The implementing body for CPI is the National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI). [2]
12. New basket includes digital services such as OTT subscriptions and e-commerce pricing — absent from the 2012-base series. [2]
13. The Monetary Policy Committee (MPC) is constituted under Section 45ZB, RBI Act, 1934 and uses CPI as its primary nominal anchor. [4]
14. CPI (new series) for January 2026: 2.75%; for April 2026: 3.48% (both provisional). [3]

8. Mains Relevance

GS Paper Mapping:

• GS-III: Indian Economy — Inflation, monetary policy, price indices, statistical systems
• GS-II: Governance — Statistical institutions, credibility of government data, policy design

Specific Syllabus Headings:

• GS-III: "Indian Economy and issues relating to planning, mobilisation of resources, growth, development and employment" / "Inclusive growth"
• GS-II: "Government policies and interventions for development in various sectors"

Plausible Mains Question Stems:

1. "The significant divergence between India's official CPI and household-perceived inflation in 2025 has raised fundamental questions about the credibility of statistical governance. Analyse the causes of this divergence and suggest measures to strengthen India's price measurement architecture."
2. "With the transition to the new CPI series (base 2024), critically evaluate the implications for RBI's monetary policy framework and the inflation-targeting regime established under the RBI Act, 1934."
3. "What are the limitations of relying on a decade-old base year for measuring consumer price inflation? How does the revision to CPI 2024 address — and fail to address — these limitations?"

9. Related Topics to Study Next

10. Common Errors / Trap Areas

1. Wrong implementing body: CPI is released by MoSPI/NSO — not the RBI. The RBI uses CPI for inflation targeting but does not produce it.
2. Confusing CPI and WPI: WPI (Wholesale Price Index) measures producer-level prices; CPI measures consumer-level prices. RBI targets CPI, not WPI. A common MCQ trap.
3. Wrong base year for old series: The outgoing series had base year 2012 (sometimes written 2012=100), not 2010 or 2011. The 2010=100 series preceded it.
4. Assuming the suppressed HCES was 2019-20 or 2021-22: The suppressed survey was specifically 2017-18. The next completed and released survey was HCES 2023-24.
5. Misattributing the inflation target to the Constitution: The 4% ± 2% target is set under Section 45ZA of the RBI Act, 1934 — a statutory provision, not a constitutional one. The target is reviewed every 5 years.