Retail Inflation at 5.54%: How a Low Base and Costlier Food Pushed Prices to a 21-Month High
Retail inflation, measured by the Consumer Price Index (CPI), rose to 5.54% in September 2026, a 21-month high. It was 4.83% in August 2026.
In September 2025, inflation was only about 1.54%. Because last year's prices were so low, this year's comparison looks much bigger. Economists call this an adverse base effect.
The rise was not only a base effect. Food prices also kept rising month after month. Onion prices were up about 108% from a year ago, ginger about 88%, garlic about 55% and lemon about 36%.
Economists noted that 11 of 12 sub-groups of the CPI showed higher inflation, which means price rise is spreading across many items (they call this "generalisation" of inflation). Below-normal rainfall, costlier imports and higher fuel costs were named as reasons.
The figure is close to 6%, the upper limit of the RBI's tolerance band (2% to 6%). The RBI's Monetary Policy Committee had already raised the repo rate by 25 basis points to 5.50% on 7 October 2026, its first hike since February 2023. Many economists now expect another hike at the December 2026 meeting.
Base Effect: Why Inflation Can Jump Even When Prices Rise Slowly
The base effect is the impact that last year's number has on this year's growth rate. Inflation in India is reported as a year-on-year change: this month's prices are compared with prices in the same month last year. That earlier figure is called the base. If prices were unusually low last year, even a normal rise this year shows up as a high inflation rate. If prices were unusually high last year, this year's inflation can look low even when prices are still rising.
September 2025 inflation was very low (about 1.54%), so the base for September 2026 was low. This adverse base effect made the September 2026 figure of 5.54% look much higher. But food prices also kept rising every month, which shows that the jump was not only a base effect, and that is why the MPC may keep raising rates.
Consumer Price Index (CPI): How India Measures Retail Inflation
The Consumer Price Index tracks how the prices of the things an ordinary household buys change over time: food, clothes, rent, fuel, transport, education, medicines and so on. The change in CPI from a year ago is India's official "retail inflation". It is released every month by the National Statistics Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI). The RBI uses the combined (rural plus urban) CPI as its inflation target.
The 5.54% figure comes from the new 2024-base CPI. Even though food now has a smaller weight in the basket, sharp rises in onion, ginger, garlic and other vegetables, plus higher inflation in 11 of 12 sub-groups, pushed the headline number close to the 6% upper limit.
Imported Inflation: How Global Prices and a Weak Rupee Raise Prices at Home
Imported inflation is price rise inside a country that comes from outside it. It happens when things the country buys from abroad, such as crude oil, edible oil, gold or fertiliser, become costlier. This can be because their world price goes up, or because the rupee becomes weaker, so more rupees are needed to buy the same dollar-priced goods. The higher cost then spreads to transport, factory goods and food.
Economists said that besides weak rainfall, "imported price pressures" and the knock-on effects of costlier fuel pushed up food inflation in September 2026. This means part of the price rise comes from outside India and cannot be fixed by domestic food supply measures alone.
Monetary Policy Committee (MPC): How RBI Sets the Repo Rate
The Monetary Policy Committee is a six-member body that decides the repo rate, the rate at which the RBI lends short-term money to banks. When the MPC raises this rate, loans slowly become costlier across the country, people and firms borrow and spend less, and price rise cools down. The MPC's legal goal is to keep CPI inflation at 4%, within a band of 2% to 6%, while keeping growth in mind.
With inflation at 5.54% and expected by some economists to cross 6% in the coming months, the MPC's "calibrated tightening" stance points to more rate hikes. If inflation stays above 6% for three quarters, the RBI would have formally missed its target.
- CPI inflation September 2026: 5.54% (21-month high); August 2026: 4.83%; September 2025: about 1.54%
- Year-on-year onion inflation: about 108%; ginger about 88%; garlic about 55%; lemon about 36%
- 11 of 12 CPI sub-groups recorded higher inflation in September 2026
- Inflation has been rising since November 2025 and was above 4% for the fourth month in a row
- CPI inflation hit a record low of 0.25% in October 2025
- New CPI series: base year 2024; 358 items; food and beverages weight about 36.75%
- Repo rate raised by 25 bps to 5.50% on 7 October 2026 (first hike since February 2023); stance: calibrated tightening
- SDF 5.25%; MSF and Bank Rate 5.75%
- RBI inflation target: 4% (band 2% to 6%); failure = average inflation outside band for 3 consecutive quarters
- Next MPC meeting: 2 to 4 December 2026