Lumpsum calculator

What a lumpsum investment is

A lumpsum is money you invest in one go: a bonus, an inheritance, maturity money from an FD, or savings that have piled up. Instead of feeding a fund every month like a SIP, the whole amount starts working from day one. If the fund grows at a steady rate, the value after n years is amount × (1 + rate)^n. That single formula is why time matters so much: the last years add far more than the first ones.

Real funds don't grow steadily. They rise and fall, and the rate you type is a long-term average, not a promise. As a guide, the Nifty 50 with dividends returned about 11.8% a year over the 10 years to October 2026, and bank FDs pay about 6.5%.

Karthik's bonus in Kallakurichi

Karthik works at a bank branch in Kallakurichi. In October 2026 he gets a ₹1 lakh bonus and puts it in an index fund. If the fund averages 12% a year, in 10 years it grows to about ₹3,10,600: more than three times his money.

Waiting just one year costs him about ₹33,000 at the end. In today's money (5% inflation), ₹3.1 lakh in ten years buys about what ₹1.9 lakh buys now.

How to use this tool

1. Pick Grow my money, Amount I need (what to invest today for a goal) or Years it takes.
2. Type the amount or the goal.
3. Set the expected return; FD and Nifty 50 averages are one tap away.
4. Set the years.
5. Turn on After tax (equity or debt fund) and Inflation for the real picture.

The chart shows the value against what you put in; the bars compare the same money elsewhere and show the cost of waiting.

Lumpsum or SIP?

A lumpsum starts compounding sooner, so in a rising market it usually ends higher. But if the market falls soon after you invest, it hurts more. If you have a large amount and are nervous about timing, park it in a liquid fund and move it into an equity fund over 6 to 12 months with a Systematic Transfer Plan (STP). It gives up a little in a steady market but softens a bad start.

Tax on lumpsum gains

• Equity funds (65% or more in shares): gains above ₹1.25 lakh a year are taxed at 12.5% if you hold for more than a year; within a year, 20%.
• Debt funds bought from April 2023: gains are added to your income and taxed at your slab.
• Cess of 4% is added on top. Tax is due only when you sell, so the money compounds untouched until then.

Where to put a lumpsum

Match the money to when you need it. For goals under three years, an FD or a debt fund keeps the amount safe. For three to five years, a hybrid fund balances growth and safety. For goals five years or more away, an equity or index fund has the best chance of beating inflation, as long as you can sit through the falls on the way.

Common mistakes

• Expecting last year's return every year. Use a long-term average, and try a lower rate too.
• Waiting for the perfect time. Time in the market usually beats timing the market.
• Forgetting inflation. A big number in 20 years buys much less than it does today.
• Investing money you need soon. Equity is for goals five years or more away.

These figures are estimates checked in October 2026. This tool is a guide, not financial advice.