What is CPI inflation, and why did 2025-26 break the pattern?
The Consumer Price Index (CPI) tracks the year-on-year change in the cost of a fixed basket of goods and services that an average Indian household buys — food, fuel, housing, clothing, healthcare, education. Compiled monthly by the National Statistical Office (NSO) under MoSPI and released on the 12th of every month, CPI inflation is the figure the Monetary Policy Committee (MPC) watches above all else.
For decades, India's story was one of persistently high inflation — averaging close to 10% during 2010-13. So when CPI inflation collapsed from 4.26% in January 2025 to a record-low 0.25% in October 2025, headlines called it a triumph. But by April 2026, under a freshly rebased CPI series (2024=100), inflation had climbed back to 3.48%, and the RBI's own FY27 projection jumped to 5.1% in June 2026. That whiplash — from "lowest ever" to "RBI worried about overshoot" within months — is exactly the kind of inflection point GS-III examiners love to test.
October 2025's CPI print of 0.25% was the lowest recorded since India's all-India combined CPI series began in 2011. To put that in perspective: in April 2022, CPI inflation had peaked at 7.8% — meaning India swung from near double-digit inflation to near-zero inflation inside three and a half years, without a recession.
The Laspeyres formula behind every monthly headline
CPI is calculated using the Laspeyres price index formula: CPI = (Cost of a fixed basket at current prices ÷ Cost of the same basket at base-year prices) × 100. The "fixed basket" is the trick — it locks in consumption patterns from a base year, so the index becomes less representative as those patterns evolve. That is precisely why India just executed its first base-year revision in over a decade.
Until December 2025, CPI ran on a 2012=100 base. From the January 2026 release (published February 12, 2026), MoSPI shifted to 2024=100, drawing on the Household Consumption Expenditure Survey (HCES) 2023-24. The food and beverages weight — long the dominant share of the Indian consumption basket — was cut by roughly 911 basis points, while services and digital-economy categories gained weight. The new series also adopts COICOP 2018 classification for global comparability, and a linking factor allows backward comparison to 2013.
| Group | Weight — 2012 Base | Direction in 2024 Base |
|---|---|---|
| Food & Beverages | 45.86% | Reduced by ~9.1 percentage points |
| Miscellaneous (incl. services, personal care) | 28.32% | Increased — wider services coverage |
| Housing | 10.07% | Broadly retained |
| Fuel & Light | 6.84% | Broadly retained |
| Clothing & Footwear | 6.53% | Broadly retained |
| Pan, Tobacco & Intoxicants | 2.38% | Broadly retained |
The first reading under the new 2024-base series — January 2026 — came in at 2.75%, sharply higher than the 1.33% recorded for December 2025 under the old 2012-base series. This was a methodology effect, not a sudden price spike: a smaller food weight reduces the dampening effect of food deflation on the headline number.
A rebased index is more representative — but it also breaks historical continuity. Economists like Aditi Nayar (ICRA) flagged that the new series "is not comparable to the old series, owing to the change in composition, weights and calculation methodology." For an examiner, this is a useful tension: technical accuracy versus the loss of a clean long-run time series for policy comparison.
Two indices, two audiences, one economy
India runs two parallel inflation measures that frequently diverge, sometimes sharply. CPI captures retail prices that households actually pay — including services like education, healthcare, and rent, which never appear in wholesale data. WPI, compiled by the Office of the Economic Adviser (DPIIT), tracks prices at the first point of bulk sale — factory gate or wholesale market — and is dominated by manufactured products (~64% weight under the old WPI series) with no services component at all.
The RBI formally adopted CPI as its key inflation gauge in April 2014, on the recommendation of the Urjit Patel Committee, precisely because CPI reflects the lived cost of living rather than producer-side cost movements.
- Measures retail prices paid by consumers
- Compiled by NSO under MoSPI
- Includes services (education, healthcare, rent)
- Food & beverages historically ~45.86% weight (now reduced under 2024 base)
- Used by RBI/MPC for inflation targeting under FIT
- Measures producer/wholesale-level prices
- Compiled by Office of Economic Adviser, DPIIT
- Excludes services entirely
- Manufactured products dominate (~64% weight)
- Used for producer margin and input-cost analysis
A 2020 UPSC Prelims statement asked whether "the weightage of food in CPI is higher than in WPI" — true — and whether "WPI does not capture changes in the prices of services, which CPI does" — also true. Mains aspirants sometimes assume CPI and WPI move together; in reality they diverge regularly, for instance when wholesale food prices fall (pulling WPI into deflation, as happened mid-2025) while retail food prices stay sticky due to distribution margins.
Headline vs core: the number behind the number
Within CPI itself, economists distinguish headline inflation (the full basket, including volatile food and fuel) from core inflation (everything excluding food and fuel). Core inflation is treated as a better signal of underlying demand pressure because it strips out monsoon-driven and geopolitically-driven price swings. In April 2026, core inflation stood near 3.1%, even as headline inflation moved to 3.48% — a gap that the MPC scrutinises closely when setting the repo rate.
From the Urjit Patel Committee to Section 45ZA
India's Flexible Inflation Targeting (FIT) framework did not emerge overnight. The Urjit Patel Committee (2014) recommended CPI-based inflation targeting as the nominal anchor for monetary policy, following a Monetary Policy Framework Agreement (MPFA) signed between the Government of India and the RBI on February 20, 2015. This was formalised through the Finance Act, 2016, which inserted Section 45ZA into the RBI Act, 1934 — coming into effect in June 2016.
Under Section 45ZA, the central government, in consultation with the RBI, fixes an inflation target once every five years. The first target — 4% with a ±2% band (2%-6%) — was notified on August 5, 2016 for the period through March 2021. It was retained unchanged for the second period (April 2021-March 2026). The six-member Monetary Policy Committee (MPC), with three RBI officials (including the Governor as Chair) and three external members appointed by government, meets at least four times a year to set the repo rate.
| Year | Milestone |
|---|---|
| 2014 | Urjit Patel Committee recommends formal inflation targeting |
| Feb 2015 | Monetary Policy Framework Agreement signed (Govt + RBI) |
| May/Jun 2016 | Finance Act 2016 inserts Sec 45ZA into RBI Act, 1934; MPC constituted |
| Aug 2016 | First inflation target notified: 4% ± 2% (Aug 2016-Mar 2021) |
| Mar 2021 | Second review: 4% ± 2% retained (Apr 2021-Mar 2026) |
| Mar 2026 | Second five-year review completed; 4% ± 2% retained again (Apr 2026-Mar 2031) |
If CPI inflation breaches the 2%-6% band for three consecutive quarters, this is treated as a "failure" under the framework, requiring the RBI to submit a report to the government explaining the causes, remedial actions, and expected time to restore the target. This happened in 2022 when inflation stayed above 6% for several quarters following the Russia-Ukraine war shock.
The 2026 review: continuity, not change
Ahead of the second review deadline (March 31, 2026), the RBI released a discussion paper (August 2025) evaluating the FIT framework's first decade — comparing average inflation of 4.9% post-2016 versus 6.8% in the pre-FIT period (2012-16). The review, held in March 2026, concluded with the government retaining the same 4% target and 2-6% band for the 2026-31 period — a decision read as an endorsement of the framework's credibility, even amid debate over whether headline or core inflation should be the operative target.
The "is this good news?" problem
For a country whose entire monetary framework was built to fight high inflation, a 0.25% print should feel like victory. But the details told a more complicated story. Rural CPI turned negative in October 2025, with rural food deflation running at nearly 5%. Vegetable prices alone saw deflation rates around 27% in some months, and potato and onion inflation stayed deeply negative (-23.69% and -17.67% respectively, as of April 2026 data).
The line economists kept repeating: "Low inflation is good until it starts looking like deflation." When prices fall continuously due to weak demand rather than supply abundance, consumers delay purchases, businesses see slower revenue growth, and government tax collections — especially GST — weaken. That demand-side reading was reinforced by slower FMCG volume growth and cautious corporate commentary on consumer spending through late 2025.
There are genuinely two competing explanations, and a good Mains answer should hold both in tension rather than picking one. Supply-side reading: a bumper harvest, GST rationalisation on roughly 400 items in September 2025, and a favourable high base from 2024's elevated prices together pushed food prices down — a one-off statistical and agricultural windfall. Demand-side reading: rural wages have been sluggish, and falling food prices may reflect farmers receiving less for their produce rather than consumers paying less for the same goods — a sign of weak rural purchasing power feeding back into the index itself.
The rural-urban divergence — an unusual reversal
For most of 2023 and 2024, rural inflation in India ran higher than urban inflation, driven by food's larger weight in rural consumption baskets. By late 2025, this reversed: rural inflation fell below urban inflation for the first time in years. While officially framed as "reduced rural stress," the reversal could equally indicate that rural households are experiencing income compression alongside price compression — a double-edged outcome that headline figures alone cannot distinguish.
If asked to evaluate India's 2025 disinflation, resist the temptation to call it unambiguously positive or negative. The strongest answers acknowledge that the same data point — falling food prices — can simultaneously help urban consumers and hurt rural producers, and that policy needs differ for each group (consumer relief vs farm income support).
Monetary policy space — the upside of low inflation
The clearest beneficiary of sustained disinflation was monetary policy itself. With CPI inflation comfortably inside the 2-6% band — and at times near the lower bound — the RBI cut the repo rate multiple times through 2025 and reduced the Cash Reserve Ratio (CRR) by 100 basis points in four tranches between September and November 2025. Lower borrowing costs supported credit growth at a time when India still posted 7.4% GDP growth for FY26, an unusual combination of strong growth with very low inflation that few large economies achieved simultaneously.
Fiscal arithmetic — the less-discussed cost
Inflation has a direct, if underappreciated, relationship with nominal tax revenue. GST collections, income tax brackets, and customs duties are all levied on nominal values — when prices fall or rise slower than budgeted, nominal GDP growth slows, and indirect tax buoyancy weakens. Through late 2025, commentary repeatedly flagged "weakening tax revenues, especially indirect tax collections" as a downstream consequence of the disinflationary episode — a reminder that the Finance Ministry and the RBI do not always have perfectly aligned interests on inflation.
Rural income and MSP — a structural worry
For agricultural households, falling food prices translate directly into lower farm-gate realisations. When onion and potato prices stay deeply negative for months, the income squeeze on producers can offset whatever gains they get from cheaper non-food inputs. This has direct implications for the Minimum Support Price (MSP) regime and for income-support schemes like PM-KISAN — both of which are calibrated against price assumptions that a sudden disinflationary episode can disrupt.
The implications panel is where GS-III answers earn marks for breadth: a single inflation trend touches monetary policy (repo rate space), fiscal policy (tax buoyancy), agricultural policy (MSP/farm incomes), and external policy (trade-weighted exchange rate effects on imported inflation, especially given Middle East-driven oil price volatility noted through 2025-26).
Monetary tools deployed through 2025-26
Through 2025, the RBI executed three consecutive repo rate cuts and a staggered 100 bps CRR reduction, easing liquidity conditions as inflation stayed well below target. By the time the MPC met in June 2026 (its 3-day meeting from June 3-5), the committee unanimously held the repo rate at 5.25% with a "neutral" stance — but simultaneously raised its FY27 CPI projection to 5.1%, signalling that the disinflationary phase was viewed as cyclical, not structural. The RBI also flagged upside risks to the current account deficit from higher energy prices linked to Middle East tensions and a weaker rupee, while liberalising FPI norms in government securities and raising NRI/OCI investment limits in equities.
Fiscal-side support: GST rationalisation
In September 2025, the government rationalised GST rates on approximately 400 items, a move widely credited with amplifying the disinflationary trend by directly lowering retail prices on a wide consumption base. This was a rare instance of fiscal and monetary policy pulling in the same disinflationary direction simultaneously — though it also meant that part of the "low inflation" reading was a one-time tax-policy effect rather than a purely market-driven trend, complicating like-for-like comparisons in subsequent months.
| Period | Headline CPI (YoY) | Food/CFPI Inflation |
|---|---|---|
| January 2025 | 4.26% | — |
| June 2025 | 2.1% | — |
| October 2025 | 0.25% (record low) | -5.02% |
| November 2025 | 0.71% | -3.91% |
| December 2025 | 1.66% | — |
| January 2026 (new 2024 base) | 2.75% | — |
| March 2026 | 3.40% | 3.87% |
| April 2026 | 3.48% | 4.20% |
The jump from 1.33% (Dec 2025, old base) to 2.75% (Jan 2026, new base) is not a real-world inflation spike — it is a statistical artefact of the base-year change. Conflating the two in an answer is a frequent error; always flag the methodology break when citing this period.
India's disinflation in a global mirror
Global headline inflation fell from a peak of 8.7% in CY2022 to 4.2% in CY2025, but India's decline was disproportionately sharp — among the steepest fall in headline inflation of any major Emerging Market and Developing Economy in 2025, a drop of roughly 1.8 percentage points. Crucially, this happened alongside 8% growth in H1 FY26, not instead of growth — a combination that rating agencies cited when assessing India's sovereign credit profile. Compare this to advanced economies: in the Eurozone, headline inflation fell to around 1.7% by January 2026 largely due to energy-price base effects, but core inflation remained comparatively sticky at 2.2%, reflecting persistent services-price pressure that India, with its much larger food weight, experiences differently.
S&P, in its sovereign rating commentary, explicitly credited India's "monetary policy reform to switch to inflation targeting" as having "reaped dividends," noting that inflation expectations are now better anchored than a decade ago — a direct validation of the Section 45ZA framework discussed earlier.
Structural reform questions for FY27 and beyond
With the RBI projecting FY27 CPI inflation near 5.1% — closer to the upper-middle of the target band — and core inflation projected at 4.7%, the "easy phase" of disinflation appears to be ending. The structural debates the second FIT review (March 2026) did not fully resolve include: whether the MPC should formally shift toward targeting core rather than headline inflation given food price volatility; how to build buffer-stock and logistics reforms that reduce the amplitude of food-price swings (rather than just monetary responses to them); and how exchange-rate pass-through from a weaker rupee and higher energy prices — both flagged in June 2026 — will interact with the inflation trajectory going into FY28.
Three threads worth weaving into a high-scoring answer: first, deepen agricultural supply-chain and storage infrastructure so that food-price volatility — which still disproportionately drives India's headline CPI — is addressed at the source rather than absorbed entirely through monetary policy. Second, use the 2024-base CPI series' improved services coverage to give the MPC sharper visibility into demand-side (core) inflation, supporting a gradual, transparent move toward greater core-inflation emphasis without abandoning the headline mandate. Third, treat the FY26 disinflation episode as a natural experiment — the divergence between rural and urban, and between food and non-food inflation, offers a rare dataset for calibrating targeted, rather than blanket, policy responses.
CPI inflation is the year-on-year percentage change in the Consumer Price Index — a fixed basket of goods and services an average household consumes — compiled monthly by the NSO under MoSPI. It measures how fast the cost of living is rising, while GDP growth measures the expansion of output. India showed both can move in different directions: 7.4% GDP growth alongside sub-2% average inflation in FY26.
The Flexible Inflation Targeting (FIT) framework rests on Section 45ZA of the RBI Act, 1934, inserted by the Finance Act, 2016. It requires the central government, in consultation with the RBI, to fix a CPI inflation target once every five years — currently 4% with a tolerance band of ±2% (2%-6%). A breach of this band for three consecutive quarters is treated as a failure, triggering a mandatory RBI explanation to government.
MoSPI launched a new CPI series with base year 2024=100 from the January 2026 release, replacing the 2012 base. Headline CPI inflation was 2.75% in January 2026, then rose to 3.40% in March 2026 and 3.48% in April 2026 (MoSPI, May 2026). In June 2026, the RBI's MPC kept the repo rate unchanged at 5.25% with a neutral stance and raised its FY27 CPI projection to 5.1% (RBI, June 2026). The government retained the 4% ± 2% inflation target for April 2026-March 2031 after the second FIT review concluded in March 2026.
The debate is whether sub-2% prints in late 2025, including the record-low 0.25% in October 2025, reflected healthy disinflation or early signs of demand weakness. Critics cite rural CPI turning negative in October 2025 (rural food deflation near 5%), slower FMCG growth, and weaker indirect tax collections as warning signs. Others argue the dip reflected genuinely positive supply-side factors — GST rationalisation on about 400 items, a favourable base effect, and a bumper harvest.
GS Paper III questions usually frame CPI inflation around the inflation-growth trade-off, the effectiveness of the Flexible Inflation Targeting framework, or policy tools available to manage inflation without choking growth. Aspirants must distinguish headline from core inflation, explain the institutional architecture (MPC, Section 45ZA), and critically evaluate whether low inflation always signals a healthy economy.
CPI measures retail prices paid by consumers and gives food and beverages the largest weight (about 45.86% under the 2012 base, reduced under the 2024 base), while WPI measures wholesale/producer-level prices dominated by manufactured products (~64% weight) and excludes services entirely. The RBI adopted CPI as its key inflation measure in April 2014 because it reflects the actual cost of living, making it the appropriate anchor for MPC rate decisions.
CPI inflation started 2025 at 4.26% in January, fell to 2.1% by June, hit a series record low of 0.25% in October, and edged up to 0.71% in November and 1.66% in December (MoSPI, January 2026). Under the new 2024-base series, January 2026 inflation was 2.75%, rising to 3.40% in March 2026 and 3.48% in April 2026 (MoSPI, May 2026), with food inflation climbing from 3.87% to 4.20% over that period.
India recorded one of the sharpest declines in headline inflation among major EMDEs in 2025 — about 1.8 percentage points — while posting 8% growth in H1 FY26, a combination global rating agencies cited favourably (Economic Survey via PIB, January 2026). This contrasts with advanced economies where core inflation stayed elevated even as headline numbers eased.
Sustained low CPI inflation gave the RBI room for repo rate cuts and a 100 bps CRR reduction through 2025, easing borrowing costs, but it also coincided with weaker indirect tax buoyancy, complicating the government's fiscal arithmetic. For rural households, falling food prices cut farm incomes even as non-food costs kept rising — a divergence with direct implications for income-support schemes and MSP policy.
The National Statistical Office (NSO) under MoSPI compiles and releases CPI data on the 12th of every month. The inflation target is reviewed every five years by the central government in consultation with the RBI under Section 45ZA of the RBI Act; the second review concluded in March 2026, retaining the 4% target with a 2-6% band for April 2026-March 2031.
CPI inflation rose to 3.48% in April 2026 over April 2025, up from 3.40% in March 2026 — the fastest reading in over a year under the new base. Rural inflation stood at 3.74% and urban at 3.16%; food inflation (CFPI) rose to 4.20% from 3.87%, driven by sharp increases in tomato (+35.28%), cauliflower (+25.58%), and coconut/copra (+44.55%), even as potato (-23.69%) and onion (-17.67%) stayed deeply in deflation.
At its June 3-5, 2026 meeting, the RBI's MPC under Governor Sanjay Malhotra unanimously kept the repo rate unchanged at 5.25% with a "neutral" stance. The RBI raised its CPI inflation projection for FY27 to 5.1%, up from an earlier 4.6% estimate, with core inflation projected at 4.7%. The Governor flagged higher energy prices and trade-policy uncertainty — linked to the Middle East conflict — as upside risks to India's current account deficit.
On February 12, 2026, MoSPI released India's first CPI data under the new 2024=100 base series, based on the HCES 2023-24. January 2026 retail inflation was 2.75% (provisional) under this series — replacing the 2012 base and adopting COICOP 2018 classification, with a reduced food weight (down ~911 bps) and expanded services coverage.
Following the second five-year review of the Flexible Inflation Targeting framework (held in the national capital in March 2026), the Government of India retained the retail inflation target at 4%, with the upper tolerance at 6% and lower tolerance at 2%, for the period April 1, 2026 to March 31, 2031 — extending the framework instituted under Section 45ZA of the RBI Act, 1934.
The Economic Survey noted that India recorded April-December 2025 average headline inflation of just 1.7% — the lowest since the CPI series began — alongside 8% GDP growth in H1 FY26. Among major EMDEs, India saw one of the sharpest declines in headline inflation in 2025, about 1.8 percentage points, with food inflation entering deflationary territory from June 2025 onward and rural inflation falling below urban inflation for the first time in recent years.
Build a single mental timeline: Oct 2025 (0.25%, record low, old base) → Jan 2026 (2.75%, first new-base reading) → Mar 2026 (3.40%) → Apr 2026 (3.48%) → Jun 2026 MPC (repo held at 5.25%, FY27 projection raised to 5.1%). This sequence alone can anchor answers on inflation dynamics, base-year revisions, and monetary policy response in the same paragraph.
- CPI = year-on-year change in a fixed consumption basket, compiled monthly by NSO/MoSPI, released on the 12th.
- RBI adopted CPI as its key inflation gauge in April 2014 on Urjit Patel Committee's recommendation.
- Section 45ZA, RBI Act 1934 — inserted by Finance Act 2016 — is the legal basis for Flexible Inflation Targeting.
- Inflation target: 4% ± 2% (2%-6%), reviewed every five years; retained for 2026-31 after March 2026 review.
- Three consecutive quarters outside the band = "failure" under FIT, requiring RBI to explain to government.
- October 2025: CPI hit a record-low 0.25% — lowest since the 2012-base series began.
- February 12, 2026: MoSPI launched the new CPI series with base year 2024=100, based on HCES 2023-24.
- New series Jan 2026 reading: 2.75% — a methodology jump, not a real-world inflation spike.
- April 2026 CPI: 3.48%; food inflation 4.20%; rural (3.74%) higher than urban (3.16%).
- June 2026 MPC: repo rate held at 5.25%, neutral stance, FY27 CPI projection raised to 5.1%.
- CPI vs WPI: CPI includes services and weights food heavily; WPI excludes services, dominated by manufactured products.
- Headline vs Core inflation: core excludes food & fuel and signals underlying demand pressure.
What most Mains answers get wrong about this topic is treating "low inflation" as the answer rather than the question. Examiners reward candidates who use the rural-urban and food-versus-non-food divergence as the analytical spine of the answer — that's where the genuine policy tension lives, not in reciting the 4% target, which every aspirant already knows.