Real interest rate

Topic: Inflation and Index Numbers: CPI, WPI, IIP and the Deflator · NCERT: Beyond NCERT

Meaning

The real interest rate is the interest rate left over after you remove inflation. It shows what a lender or saver really earns, and what a borrower really pays, in terms of goods and services.

• Fisher relation (approximate): Real rate = Nominal rate − (expected) inflation
• Exact form: (1 + real rate) = (1 + nominal rate) / (1 + inflation)

It matters because people decide whether to save, borrow or invest by looking at the real rate, not the rate printed on the loan or deposit. It links savers, borrowers and the RBI's monetary policy.

Explanation

How it works

• Nominal interest rate: the rate written on the loan or fixed deposit (FD).
• Inflation (the general rise in prices) lowers what each rupee can buy.
• So the rupees you get back as interest buy less than the same rupees would buy today.
• The real rate measures the actual gain in purchasing power (how much ₹1 can buy).
• Worked example (NCERT-style):
• FD rate = 7%, inflation = 6%.
• Approximate real return = 7 − 6 = about 1%.
• Exact real return = 1.07 / 1.06 − 1 = 0.94%.

• The short formula is close enough when rates are low. The exact formula is more correct.

• Recent example: the same 7% FD with CPI inflation of 2.75% (January 2026) gives a real return of about 4.25% [1].

Types: ex-ante and ex-post

• Ex-ante real rate: nominal rate minus expected inflation.
• This is the rate people see when they make a decision, before the year begins.

• It drives decisions to save and invest.

• Ex-post real rate: nominal rate minus the inflation that actually happened.

• It is known only after the period is over.
• If inflation turns out higher than expected, the ex-post real rate falls below the ex-ante rate. Lenders lose and borrowers gain.

What makes it rise or fall

• It rises when:
• nominal rates go up while inflation stays the same; or

• inflation falls while nominal rates stay the same, as in the 4.25% example above.

• It falls when:

• inflation rises faster than deposit and loan rates.

• Negative real rate: inflation is higher than the deposit rate.

• Savers' real returns fall below zero.
• Households move money out of bank deposits into gold, real estate or equities.
• Banks then find it harder to raise deposits.

Who gains and who loses

• Borrowers (debtors) gain when the real rate is low, because they repay in cheaper rupees.

• Example: a loan at 8% with 6% inflation costs only about 2% in real terms.

• Lenders (creditors) and savers lose, because they get back rupees that buy less.

• Cash holders lose the most. Cash earns 0% nominal interest, so its real return equals minus the inflation rate.

• Example: ₹10,000 in cash with 5% inflation is worth 10,000 / 1.05 = ₹9,524 after one year. The hidden inflation tax is about ₹476.

• The government gains, because it is the biggest debtor. Inflation lowers the real burden of public debt.

In India

• Which inflation number is used: real returns are usually worked out with CPI-Combined (CPI-C). CPI-C tracks retail prices, including services, so it is the index that matters for households.
• The new CPI (base 2024 = 100) was first released by MoSPI/NSO on 12 February 2026 [1].
• First inflation reading on the new base: 2.75% (January 2026, provisional) [1].
• Last reading on the old base: 1.33% (December 2025, final) [1].

• With inflation this low, a 7% FD gives a clearly positive real return, about 4.25% [1].

• Monetary policy anchor, flexible inflation targeting (FIT): under FIT, the RBI's main goal is a set inflation number, but it may still pay attention to growth in the short run.

• Recommended by the Urjit Patel Committee (2014).
• Given legal backing by the RBI Act amendment (2016).
• Target: 4% CPI-C, with a band of 2–6%, reviewed every five years. A March 2026 notification is reported to renew the target from 1 April 2026 to 31 March 2031 (verify current).

• Keeping inflation near 4% helps keep real interest rates moderately positive.

• Food weight and headline CPI: the 2024 CPI series gives food and beverages a weight of 36.75% (COICOP grouping) [2]. So headline CPI, and the real rates worked out from it, now swing less with vegetable prices.

• Protection tools: inflation-indexed bonds link principal or coupon (the interest payment) to a price index. This protects the investor's real return.

Don't confuse with

• Nominal interest rate: the stated rate on the loan or deposit. The real rate is the nominal rate minus inflation. A high nominal rate can still mean a negative real rate.
• Ex-ante vs ex-post real rate: ex-ante uses expected inflation and drives decisions. Ex-post uses actual inflation and is known only afterwards.
• Real wage: this adjusts a wage level with a formula: (money wage / CPI) × 100. The real interest rate adjusts a rate of return by subtracting the inflation rate.
• CPI-C vs CPI-IW: CPI-C is the inflation-target index, used for monetary policy and real returns. CPI-IW is the index for Dearness Allowance (DA) [3].

Prelims Hooks

• Fisher relation: Real rate ≈ Nominal rate − expected inflation. The exact form is (1 + r) = (1 + i)/(1 + π).
• A 7% FD with 6% inflation gives a real return of about 1% (exact 0.94%).
• Negative real rate = inflation is higher than the deposit rate. Savers lose, and money moves towards gold, real estate and equities.
• Inflation moves income from creditors to debtors. The government, as the largest debtor, gains.
• Trap: the RBI's target index is CPI-C at 4% (2–6% band). It is not WPI and not CPI-IW. The target was recommended by the Urjit Patel Committee (2014) and given legal backing in 2016.
• Ex-ante (expected inflation) real rate guides saving and investment decisions. Ex-post uses actual inflation.

Mains Points

• Real rates link savers, borrowers and policy.
• Negative real rates push households towards gold and real estate and slow deposit growth. This weakens financial saving (saving held as bank deposits and similar financial assets) and so reduces the money banks can lend.
• High positive real rates make loans costly and can choke investment.

• The 4% CPI-C target (2–6% band) tries to keep real rates moderately positive, which balances both concerns.

• Inflation hurts savers and helps debtors, and the poor suffer most.

• Pensioners without indexation and small depositors lose when real rates turn negative.
• The government gains as the biggest debtor, because inflation lowers the real burden of public debt.

• This supports low, stable inflation and tools such as inflation-indexed bonds.

• The measurement choice matters for policy.

• The lower food weight in CPI 2024 (36.75%) [2] makes headline inflation, and the real rates worked out from it, a steadier guide for the RBI.
• Food price shocks still need the government's supply-side tools, not interest-rate changes. The RBI's repo rate cannot fix a supply shortage.

Related concepts

• Real wage
• Wage indexation
• Dearness Allowance
• Indexation
• Inflation tax

Read more

• Effects and uses: real wages, real interest rates, indexation and the inflation target