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Inflation

General

Consumer Price Inflation

The rate at which the general price level of goods and services rises over time, eroding purchasing power. Measured in India primarily through the Consumer Price Index (CPI).

Definition

Inflation is the rate at which the general level of prices for goods and services rises over time, causing the purchasing power of money to fall. In practical terms, ₹100 today buys less than ₹100 bought five years ago — that reduction in purchasing power is inflation.

Inflation is measured as a percentage change in a price index over a period. The Reserve Bank of India (RBI) monitors CPI (Consumer Price Index) as its primary inflation benchmark and uses monetary policy tools — primarily the repo rate — to keep inflation within a target band of 2–6%.

For individual financial planning, inflation is the silent destroyer of wealth: money kept idle in a savings account or under a mattress loses real value every year.

Formula

Inflation Rate = [(CPI This Year − CPI Last Year) / CPI Last Year] × 100

Purchasing Power After n Years = Current Value / (1 + Inflation Rate)^n

Real Return = [(1 + Nominal Return) / (1 + Inflation Rate)] − 1 (approximate: Nominal Return − Inflation Rate)

Worked Example

You have ₹10,00,000 in savings today. Assuming average inflation of 5% per year:

Purchasing power in 10 years = ₹10,00,000 / (1.05)^10 = ₹6,13,913

Your money hasn't changed in nominal terms, but it can only buy goods worth ₹6.14 lakh in today's terms. You've effectively lost ₹3.86 lakh in purchasing power by keeping money idle.

Comparison: If the same ₹10 lakh is invested in a SIP averaging 12% annual return:

  • Nominal value in 10 years ≈ ₹31 lakh
  • Real value (inflation-adjusted at 5%) ≈ ₹19 lakh

Real return ≈ 6.7% per annum — meaning your purchasing power grows by 6.7% annually.

Use the inflation calculator to see how inflation erodes your savings, or the SIP calculator to find out how much you need to invest to reach an inflation-adjusted goal.

Key Things to Know

  • Rule of 72 for inflation: Divide 72 by the inflation rate to find how many years it takes for prices to double. At 6% inflation: 72 ÷ 6 = 12 years. Your retirement corpus target must account for this doubling of costs.
  • FD vs inflation: A typical bank FD at 7% with a 30% tax = post-tax return of ~4.9%. If inflation is 5%, your real post-tax return on the FD is actually negative. FDs preserve capital but do not grow real wealth over long periods.
  • PPF and inflation: PPF currently earns 7.1% and interest is tax-free, giving a real return of approximately 2% above typical inflation — one of the best risk-free inflation-beating options available to Indian investors.
  • Indexation and tax: India's tax system recognises that inflation-driven capital gains are not real gains. The Cost Inflation Index (CII) adjusts the purchase price of assets for inflation before computing LTCG tax — reducing tax on phantom gains. (Note: indexation benefit for debt funds was removed in April 2023; for real estate it applies to property purchased before July 2024.)
  • Retirement planning: When calculating your retirement corpus, always express your goal in today's money terms and then inflate it. If you need ₹1 lakh/month today at age 60, you will need approximately ₹2.6 lakh/month at 60 if you are currently 40 (assuming 5% inflation). Use the retirement calculator to model this accurately.

Related Calculators

Inflation Calculator →Calculate how inflation erodes purchasing power over time using real Indian CPI rates. See today's equivalent of any past amount and plan your finances smarter.
SIP Calculator →Calculate your SIP returns instantly. Enter monthly investment, expected annual return, and time period to see total corpus, invested amount, and estimated gains.
Retirement Calculator →Calculate your retirement corpus and monthly income in India. Enter current age, savings, monthly investment, returns and inflation to plan your retirement.

Related Terms

CAGRCompound Annual Growth RateRepo RateRepurchase Agreement RateFDFixed DepositPPFPublic Provident Fund
Frequently Asked Questions
How is inflation measured in India?
India uses two main inflation indices: Consumer Price Index (CPI), which measures retail inflation across food, fuel, housing, and services — this is the RBI's primary target metric. Wholesale Price Index (WPI) measures price changes at the producer/wholesale level. The RBI targets CPI inflation at 4% with a tolerance band of 2–6%.
What is a good inflation rate?
A low, stable inflation rate of 2–4% is generally considered healthy — it indicates a growing economy where prices are rising at a manageable pace. Very low inflation (deflation) can signal a slowing economy. Very high inflation (above 6%) erodes purchasing power rapidly and forces the RBI to raise interest rates.
How does inflation affect my investments?
Inflation erodes the real (purchasing-power-adjusted) value of your returns. If your FD earns 7% but inflation is 5%, your real return is only about 2%. Equity investments have historically beaten inflation over long periods; fixed-income instruments like FDs and PPF may barely keep pace. This is why staying invested in equity for long-term goals is important.
What is the difference between CPI and WPI?
CPI (Consumer Price Index) measures what consumers pay for a basket of goods and services — it reflects the inflation experienced by households. WPI (Wholesale Price Index) measures price changes at the wholesale/producer stage before goods reach consumers. CPI is more relevant for individual financial planning; WPI is a leading indicator for future CPI.
How does inflation affect loan repayments?
Inflation can actually benefit borrowers with fixed-rate loans. If you took a home loan at 8% and inflation rises to 6%, the real interest rate is only 2%. Your future EMI payments are made in money that is worth less (in purchasing-power terms) than today's money. However, high inflation usually triggers rate hikes, increasing floating-rate loan costs.