What Is Inflation and CPI? How India Measures Prices and Why It Moves Your Portfolio

Inflation is the quiet line item in every portfolio. A return that doesn’t beat inflation is a loss in what your money can buy.

What’s in India’s CPI basket

CPI vs WPI

The RBI target

Inflation and your returns

Inflation feeds into growth figures too: nominal GDP minus inflation gives real GDP, as covered in what is GDP. When inflation spikes, the RBI tightens, and that is a common trigger for bear markets. For a valuation view, a higher rate raises the discount rate in a DCF.

The basket in detail

India’s headline Consumer Price Index (combined, base 2012 = 100) is published by MoSPI on the 12th of each month. The weights come from household spending surveys:

Food is almost half the basket. That is why a bad monsoon, a vegetable price spike or an export ban can swing headline inflation by several percentage points in a few months. Tomatoes, onions and potatoes alone have caused several of India’s sharpest inflation spikes. MoSPI is updating the base year and weights to reflect more recent spending surveys, which is expected to reduce the food weight. Check which series a figure refers to when comparing years.

Headline vs core inflation

Core inflation strips out food and fuel, the most volatile items. It is not an official MoSPI series, but economists and the RBI track versions of it closely. Core tells you whether price pressure is spreading into services, rents and manufactured goods, which is harder to reverse than a temporary vegetable spike.

When headline inflation is high but core is stable, the RBI often waits for food prices to settle. When core inflation is rising, rate hikes become more likely.

How the RBI’s inflation target works

Since 2016, the RBI has operated under a flexible inflation-targeting framework. The target is 4% CPI inflation, with a tolerance band of 2% to 6%. If inflation stays outside the band for three consecutive quarters, the RBI must write to the government explaining why and what it will do. That happened for the first time in 2022.

Rates are set by a six-member Monetary Policy Committee: three RBI members and three external members, with the Governor holding a casting vote. It meets at least four times a year, usually six. Its main tool is the repo rate, the rate at which banks borrow from the RBI. Changes flow through to loan rates, deposit rates and bond yields.

Real returns: the only returns that count

A real return is your return minus inflation. A fixed deposit paying 7% when inflation is 5% gives a real return of about 2% before tax. After tax at 30%, the post-tax return is 4.9%, and the real return is close to zero.

Which assets protect against Indian inflation

• Equities: companies can raise prices, so earnings rise with inflation over time. In the short run, sudden inflation spikes hurt valuations because rates rise.
• Gold: Indian households have long used gold as an inflation hedge. Over long periods it has roughly kept pace with rupee inflation plus rupee depreciation, with long flat stretches.
• Fixed deposits and debt funds: fixed nominal returns. They protect only if the rate is well above expected inflation.
• Real estate: rents and prices tend to follow inflation over long periods, but returns vary hugely by city and costs are high.
• Inflation-linked bonds: India issued them in 2013, but the market never became liquid, so few investors use them.

Inflation inside company analysis

At the company level, inflation shows up as input cost pressure. Consumer companies faced it in 2021–22 when palm oil, crude and packaging costs jumped. Those with pricing power, typically strong brands with high market share, passed costs on with a lag and recovered margins. Those without it saw margins fall. When you read results, compare gross margin to the previous year. A falling gross margin during an inflationary period is a direct read on pricing power.

A short history of Indian inflation

India’s inflation record splits into clear phases. In the 1970s, oil shocks and droughts pushed inflation above 20% in some years. Through the 1990s and early 2000s, it mostly ran at 4–8%. From 2009 to 2013, CPI inflation stayed near or above 10% for an extended period, driven by food prices, high fiscal deficits and a weak rupee. That episode, together with the 2013 taper tantrum, led directly to the Urjit Patel committee report and the adoption of inflation targeting in 2016.

Since then, inflation has mostly stayed within the 2–6% band, with breaches during the Covid supply shock and the 2022 commodity spike after the Russia–Ukraine war. Periods of food-driven spikes have continued, but the anchoring of expectations has improved. For long-term planning, many advisers assume 5–6% inflation for household costs, and higher for education and healthcare, which have historically risen faster than the headline index.

Your personal inflation rate

The CPI basket is an average for the whole country. Your own spending can look very different. An urban family that rents, pays private school fees and uses private healthcare spends far less of its budget on food than the CPI weights assume, and far more on services whose prices rise faster. Education inflation in India has often run at 8–10% a year. Medical costs have often risen faster still.

Inflation and bond prices

Bonds pay a fixed coupon, so rising inflation erodes their value. When the RBI raises rates to fight inflation, existing bond prices fall. The longer the bond’s duration, the larger the fall. A debt fund with a duration of 7 years can lose around 7% for every one percentage point rise in yields. Short-duration funds and floating-rate bonds are less exposed. Match bond duration to how long you will hold, and to your view of where inflation and the repo rate are heading.