PRESS RELEASE OF CONSUMER PRICE INDEX ON BASE 2024=100 FOR SEPTEMBER, 2026

1. At a Glance

• Consumer Price Index (CPI) measures how the general level of retail prices changes over time, for goods and services that households buy for consumption [2].
• Retail (headline) inflation is the year-on-year % change in CPI. For September 2026 it is 5.54% (Provisional). Food inflation (CFPI) is 7.74% [1].
• This is the new CPI 2024=100 series. It uses HCES 2023-24 weights and the COICOP 2018 classification, so it is directly examinable for both Prelims (statistics, methods) and Mains (inflation, monetary policy) [2].
• Headline CPI is the anchor for India's flexible inflation targeting of 4% ±2%, so every monthly print matters for the RBI's MPC [4][5].

2. Why in the News

• 12 Oct 2026: MoSPI (through PIB Delhi) released CPI for September 2026. Headline was 5.54%, up from 4.83% (Final) in August 2026. That is about a 71 bps jump [1].
• Food inflation rose from 5.97% to 7.74%. Onion inflation was 108.09%, up from 48.78% in August [1].
• Rural inflation (6.08%) is now above the 6% upper tolerance limit. Combined (5.54%) is still inside the band [1][5].

3. Background & Evolution

• Jan 2011: MoSPI started releasing CPI for Rural, Urban and Combined, with base 2010=100 [2].
• Base 2012=100: this was the earlier series. Its data runs up to Dec 2025 [3].
• May 2016: the RBI Act, 1934 was amended to create a statutory flexible inflation targeting framework. The CPI target is set every 5 years [5].
• Mar 2021: the 4% ±2% target was retained up to Mar 2026 [5].
• 12 Feb 2026: first press release of CPI on base 2024=100. The new series covers data from Jan 2026 [3][2].
• Back series (released 12 Feb 2026): All-India indices from Jan 2013 to Dec 2024, and inflation rates from Jan 2014 to Dec 2024, both made with linking factors [2].
• An Expert Group advised on the base revision, including sample selection and methodology [2].

4. Core Static Facts

September 2026 headline data [1]:

5. Multi-Dimensional Analysis

Economic

• Food and beverages inflation was 7.36% against a weight of about 36.8%, so it drove the uptick [1][2].
• Restaurants and accommodation was at 9.36%, which points to food costs passing through into services [1].
• Personal care, social protection and miscellaneous was the highest division at 13.75%. Silver jewellery was at 87.80%, so precious-metal prices are pushing this up [1].
• Housing (2.74%), Health (1.40%) and Recreation (2.16%) remain low. Inflation is concentrated in a few divisions rather than broad-based [1].

Social

• Rural inflation (6.08%) is higher than urban (4.88%). Rural households have a larger food share (41.98%, against 30.25% urban), so they are hit harder by vegetable spikes [1][2].
• Onion, garlic, ginger and lemon all saw sharp price rises. These are staples, so the burden on poorer households is regressive [1].

Monetary policy / Governance

• Headline CPI is the statutory target variable. The framework counts it as a failure if inflation stays outside the 2-6% band for three consecutive quarters [5].
• Rural CPI is above 6% for this month. Combined CPI is the targeted measure, and it is within the band [1][5].

Statistical / Technological

• The new series uses alternative data: e-commerce prices, OTT prices (Netflix, JioHotstar and others), airfares collected online, rail fares from Railways administrative data, and mobile tariffs weighted by TRAI subscriber shares [2].
• Free social transfers (for example free PDS grain) are excluded from CPI, in line with the IMF CPI Manual [2].

Administrative / Federal

• State-level indices are published every month for all States/UTs. MoSPI warns that state item indices may rest on thin samples and should be used with caution [1][2].

6. Recent Developments (last 12-18 months)

• 12 Feb 2026: CPI 2024 series launched, with back series and linking factors [3][2].
• 2026: the RBI review of the monetary policy framework kept the 4% target with a ±2% band for the period to March 2031. Check the final Government notification for the exact wording [5].
• 12 Oct 2026: September 2026 CPI released at 5.54% headline and 7.74% CFPI [1].
• Next release: October 2026 CPI is due on 12 Nov 2026 (Thursday) [1].

7. Prelims Hooks

• The new CPI base year is 2024=100. Its weights come from HCES 2023-24 [2].
• CPI 2024 follows COICOP 2018, which was developed by the UN Statistics Division [2].
• CPI 2024 has 12 Divisions, 43 Groups, 92 Classes and 162 Sub-classes [2].
• Weighted items rose from 299 to 358 [2].
• The elementary index uses the Jevons formula. Higher levels use Young/Modified Laspeyres [2].
• The combined general linking factor (2012 to 2024 series) is 0.5267, with 2025 as the overlap year [2].
• 12 online markets were added, in towns with population above 25 lakh [2].
• Rural housing is now included in CPI [2].
• Prices of petrol, diesel and LPG refer to the 15th of the month and are sourced from PPAC [1][2].
• Price data is collected by the Field Operations Division of NSO (MoSPI), not by the RBI or the Labour Bureau [1][2].
• The combined food & beverages weight is 36.753% in the new series [2].
• MoSPI first released Rural, Urban and Combined CPI in January 2011 (base 2010) [2].
• In September 2026, onion had the highest inflation (108.09%) and potato the lowest (−11.50%) [1].

8. What the 5.54% Hides: A Few Items, Not a Broad Price Rise

• A handful of items are driving most of the jump
• Onion prices were 108.09% higher than a year ago, and silver jewellery 87.80% higher [1].
• Housing (2.74%), Health (1.40%) and Recreation (2.16%) stayed low [1].

• So the headline (the single all-India number) is being pulled up by a few spikes. Most prices are not rising fast.

• The highest division says very little about demand

• 'Personal care, social protection and miscellaneous' was at 13.75%, but much of this comes from silver prices [1].
• Silver prices follow world metal markets, not Indian household spending.

• Silver alone is pushing that number up, so it does not tell us what demand is doing.

• Watch whether the price rise is spreading — that is the real warning sign

• Restaurants and accommodation rose 9.36% [1].
• When restaurants raise their menu prices because vegetables cost more, a food shock starts turning into a services price rise.

• That kind of rise is slower to go away. RBI's Monetary Policy Committee, or MPC (the six-member body that sets the repo rate), will watch this more closely than the onion number itself.

• The swings come from a few vegetables, not from food as a whole

• The Economic Survey 2024-25 found that food inflation for April–December FY25 fell to about 4.3% when vegetables and pulses were removed [11].
• Removing only tomato, onion and potato (the TOP crops) gave 6.5% [11].

• The September 2026 print fits the same pattern. CFPI (Consumer Food Price Index, i.e. food inflation) at 7.74% is driven by onion, garlic and ginger, while potato actually fell 11.50% [1].

• One month is not a trend

• September is provisional, so it can still be revised when the final figure comes out [1].
• The jump from 4.83% to 5.54% happened in a single month [1]. A careful answer says what would make it lasting (prices spreading into services), not just that it went up.

9. Headline or Core: Which Number Should RBI Chase?

• The question is genuinely open, and RBI itself raised it
• In August 2025, RBI put out a discussion paper before reviewing the inflation target [9].
• It asked whether policy should follow headline inflation or core inflation (the price rise left after removing food and fuel) [9].

• It said the debate matters more in countries where food and fuel take a big share of the basket, as in India [9].

• The case for core inflation (the strongest objection to the current system)

• A rate hike cannot make onions grow faster. Food price spikes mostly come from weather and supply, not from too much demand.
• The Economic Survey 2020-21 argued that a focus only on headline CPI may not be right, because many food price moves are short-lived and supply-driven [10].
• It called for a greater focus on core inflation [10].

• September 2026 makes this argument look strong: much of the rise is onion and silver, and RBI's interest rate has no effect on either [1].

• The answer: why headline was kept

• The RBI paper warned that leaving food and fuel out could bias policy and hurt RBI's credibility (whether people believe RBI will keep prices in check) [9].
• The reason is simple. Households live on food prices. If RBI ignores food, its target stops matching the price rise people actually feel.
• In the public feedback, 41 respondents wanted headline as the only target. 25 wanted core to play a supporting role [5].
• Of 48 countries that target inflation, 47 target headline. Only Uganda targets core [5].

• The final review kept the headline CPI target at 4% ±2% [5].

• What the core camp gets right

• Supporters of core are right that RBI should not raise rates every time onion prices jump.

• The 2-6% band exists for exactly this reason: it lets one-off shocks pass without a policy response. A breach counts as a failure only after three quarters in a row [5].

• The new basket makes the debate smaller

• Food & beverages now weigh 36.753% in the Combined CPI, down from 42.617% [2].
• RBI has said that with food's weight lower, headline and core inflation are likely to move closer together [5].

• So rebasing has partly met the core camp's demand without changing the law.

• What RBI and MoSPI can do

• The MPC should explain its decisions using headline alongside measures that remove the most volatile items, as the Economic Survey 2024-25 did when it removed vegetables and pulses [11].
• This keeps the legal target unchanged, while making clear when a spike can safely be left alone.

10. Why Old and New CPI Numbers Are Not the Same Thing

• The 4% target was first set using a different basket
• The framework began in 2016, when CPI used the 2012 base [5][3].
• The new basket gives food less weight, covers rural rent for the first time, and has 358 items instead of 299 [2].

• So 5.54% today does not measure exactly the same thing a 5.54% measured in 2018.

• The back series joins the two only at the top level

• The old and new series are joined using a linking factor (a number that converts old index values into the new scale). For the Combined index it is 0.5267 [2].
• This link works only for the general index, not for each item or group [3].

• So you cannot compare 'food inflation in 2019' with 'food inflation in 2026' item by item with full confidence.

• Some things CPI leaves out on purpose

• Free grain under PDS is not counted, following the IMF CPI Manual [2].

• So a family that gets free ration grain is protected more than the CPI shows. The index measures market prices, not what each household actually pays.

• State numbers need care

• MoSPI warns that state item indices may rest on thin samples (too few price quotes) [1][2].
• Using one month's state-level onion inflation to judge a state government's performance can mislead.

11. Anchors for Answers

• Data: CPI (Combined) inflation was 5.54% and CFPI 7.74% in Sep 2026 (provisional); onion was 108.09% [1]
• Data: Food & beverages weight in Combined CPI fell from 42.617% to 36.753% in the 2024 series [2]
• Data: Leaving out vegetables and pulses cut food inflation to about 4.3% (Apr–Dec FY25) [11]
• Report/Committee: RBI Discussion Paper on Review of Monetary Policy Framework, August 2025 (headline vs core debate) [9]; Economic Survey 2020-21 (called for more focus on core inflation) [10]
• Law/Case: RBI Act, 1934 (amended 2016): statutory flexible inflation targeting, 4% ±2%, retained to March 2031 [5]
• Comparison: 47 of 48 inflation-targeting countries target headline; only Uganda targets core [5]
• Scheme: Operation Greens (TOP crops: tomato, onion, potato), the supply-side answer to the vegetable spikes behind CFPI

12. Mains Relevance

• GS-III: Indian Economy, covering inflation, mobilisation of resources, and monetary policy. Also Agriculture, covering supply chains and price volatility of perishables.
• GS-II: Governance, covering transparency and the credibility of official statistics.
• Question stems: 1. The rebasing of CPI to 2024 with a reduced food weight could alter the conduct of monetary policy in India. Critically examine. 2. Recurring spikes in vegetable prices expose structural weaknesses in India's agricultural supply chains. Discuss with reference to the 'TOP' crops. 3. How do alternative data sources and international classification standards strengthen the credibility of India's price statistics?

13. Related Topics to Study Next

• Wholesale Price Index (WPI): compiled by DPIIT, not MoSPI. Its basket differs from CPI's and it has no services.
• Monetary Policy Committee and Section 45ZA of the RBI Act: the statutory inflation target.
• HCES 2023-24: the source of the CPI weights and of the shift in consumption patterns.
• GDP and IIP base revisions (2026): these were rebased in parallel as part of the national statistics overhaul.
• Operation Greens / TOP crops: directly linked to onion, tomato and potato volatility.
• CPI-IW / CPI-AL / CPI-RL (Labour Bureau): used for DA and wage indexation.
• Core inflation and food-fuel exclusion debate: relevant to the choice of target variable.

14. NCERT Concepts to Revise

• Consumer Price Index (Economy): The whole note is about the new CPI series, so how a fixed-basket index works is essential.
• Base year (Economy): The note centres on rebasing CPI to 2024=100, which changes weights and affects comparison with old series.
• Flexible inflation targeting (Economy): Headline CPI is the legal target, with a 4% ±2% band and a three-quarter failure rule.
• Headline inflation (Economy): The 5.54% figure is headline inflation, and the note debates whether RBI should target it or core.
• Core inflation (Economy): The headline versus core debate asks whether RBI should ignore volatile food and fuel spikes like onion.
• Consumer Food Price Index (Economy): Food inflation of 7.74% is measured by CFPI, the sub-index driving the September jump.

15. Common Errors / Trap Areas

• Wrong agency. CPI (R/U/C) is compiled by NSO-MoSPI. CPI-IW is compiled by the Labour Bureau, and WPI by DPIIT [2].
• Count of divisions. COICOP 2018 has 13 divisions. India's CPI 2024 uses 12: the release jumps from code 11 to code 13, because division 12 (insurance and financial services) is not in the basket [1][2].
• Back series is not a full overlap. The two series can be linked directly only at the general index level [3].
• Weight confusion. Food & beverages is 40.104% under the old grouping (2024 weights), but 36.753% under the COICOP 2018 divisions [2].
• Provisional vs Final. September 2026 figures are provisional and August is final. Rural above 6% for one month does not mean a breach of the target [1][5].