Inflation-Adjusted Return Calculator
A 12% return with 6% inflation is not a 6% gain — it is 5.66%. This shows your real return after inflation and tax, and what your investment is truly worth in today's money.
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How to use this calculator
- Enter amount invested
- Enter return you expect — The headline rate, before inflation.
- Enter expected inflation
- Enter investment period
- Enter tax on your gains — Leave at 0 to see the pre-tax picture. (optional — leave it as it is if it does not apply)
- Read the result — it updates as you type.
The formula used
Real return = [ (1 + nominal) ÷ (1 + inflation) − 1 ] × 100
- nominal
- The return you actually earn, after tax, as a decimal
- inflation
- The inflation rate as a decimal
This is the Fisher equation. It is not the same as "nominal minus inflation", although the two are close at low rates. At 12% and 6% the correct answer is 5.66%, not 6% — the gap widens as rates rise.
Tax is applied first, because you pay tax on the nominal gain, not the real one. That is one of the least fair features of investing during inflation.
Worked example
₹5,00,000 at 12% for 15 years with 6% inflation and no tax.
- Nominal value₹5,00,000 × 1.12¹⁵ = ₹27,36,783
- Real rate(1.12 ÷ 1.06) − 1 = 5.66%
- Real value = ₹5,00,000 × 1.0566¹⁵ = ₹11,41,884
- Real gain = ₹6,41,884 in today's money
The account will show ₹27.4 lakh, but it will buy what ₹11.4 lakh buys today. Both numbers are true — only one tells you how much better off you are.
Nominal returns flatter; real returns inform
Every return you see advertised is nominal. Your bank quotes 7%; your fund shows 12%. Neither figure tells you whether you can buy more than before.
The three-step reality check
- Start with the nominal return.
- Take off tax — you are taxed on the whole nominal gain.
- Then remove inflation.
A 7% fixed deposit in the 30% bracket returns 4.9% after tax. Against 6% inflation, that is a real return of about −1%. The balance grows; the buying power shrinks.
Why this matters most for long goals
Over one year the difference is easy to shrug off. Over twenty-five years of retirement savings, a real return of 1% versus 4% changes the required corpus by several times.
The one line worth remembering
Judge every investment by what it returns after tax and after inflation. Everything else is marketing.
Tips and common mistakes
Getting more out of it
- Apply tax before inflation, as this calculator does. You are taxed on the nominal gain, not the real one.
- Use the real return, not the headline rate, whenever you compare two very different investments.
Mistakes to avoid
- Subtracting inflation from the return. At 12% and 6% the correct answer is 5.66%, not 6%.
- Judging a fixed deposit by its advertised rate rather than what survives tax and inflation.
- Assuming a negative real return is impossible. For low-rate savings after tax, it is common.
Frequently asked questions
What is a real return?
Your return after inflation is removed — the increase in what your money can actually buy, rather than the increase in the number on the statement.
Why not just subtract inflation from the return?
Because inflation also erodes the returns you earn, not just the original amount. Subtraction is a decent approximation at low rates and increasingly wrong at high ones.
Can a real return be negative?
Yes, and it often is for savings accounts and low-rate deposits after tax. A negative real return means you are slowly losing purchasing power.
Should I apply tax before or after inflation?
Before. Tax is charged on the nominal gain, which is exactly why inflation is expensive for investors — you are taxed on gains that were only keeping pace with prices.
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