Lumpsum Calculator (One-Time Investment)

How to use this lumpsum calculator

1. Enter the amount you plan to invest once, for example ₹1 lakh.
2. Enter the expected return a year. 12% is only a starting assumption: mutual fund returns are market-linked and not guaranteed.
3. Set the investment period in years.
4. Open "More options" to change the inflation rate used for the value in today's money.
5. Read the result: the estimated value, your gains, the value in today's rupees, the same money as a SIP, and a year-by-year table.

The lumpsum formula

A lump sum is invested once and left to grow. The calculator compounds the return once a year, so the return you enter works as a compound annual growth rate (CAGR), the way fund returns over several years are usually quoted.

Lumpsum value by amount and period

Estimated values at 12% a year:

Time matters more than you might expect. Doubling the period from 10 to 20 years more than triples the value, because the gains keep earning gains.

How much to invest today for a goal

Turn the formula round to find the lump sum you need now: P = FV ÷ (1 + r)ⁿ. At an assumed 12% a year:

Enter one of these amounts above to check it, then try a lower return: the lower the return, the more you need to put in. Remember that a goal in 20 years is in future rupees, so a ₹1 crore target buys about what ₹45.6 lakh buys today at 4% inflation.

How much the return assumption matters

₹1 lakh invested once, at different yearly returns:

Over 20 years, the gap between 8% and 12% is about ₹5 lakh on every ₹1 lakh you invest. Mutual fund returns are market-linked: they are not guaranteed, they vary from year to year and can be negative for a while. Always run a cautious figure alongside the one you hope for, and read the scheme documents before you invest.

Choosing an expected return

The calculator can't tell you what a fund will earn; it shows what a return would do. Pick a figure that suits the kind of fund you have in mind, and remember that equity funds swing far more from year to year than debt funds. Fund returns are reported after the fund's running costs, which come out of its NAV, so use a return net of costs. For comparison, government savings schemes pay 7.1% (PPF) and 8.2% (Sukanya Samriddhi) for October–December 2026. A market-linked fund has to beat those by enough to justify the risk you take.

In today's money

A rupee in 20 years won't buy what a rupee buys now. The calculator divides the final value by inflation for every year, using 4% by default, the RBI's target for CPI inflation.

A 12% return with 4% inflation is a real return of about 7.7% a year (1.12 ÷ 1.04), so your buying power roughly doubles in 10 years rather than tripling.

Lump sum or SIP?

The calculator also shows what the same total would reach as a monthly SIP over the same years, using the SIP calculator's method: the yearly return ÷ 12 each month, with each instalment invested at the start of the month.

On paper the lump sum always wins, because all of your money is invested for the whole period while a SIP's later instalments have only a short time to grow. Real markets don't move in a straight line, though. If prices fall soon after you invest a lump sum, the whole amount falls with them; a SIP buys at many different prices. If you already have the money, the choice comes down to how comfortable you are with that timing risk. If you save from a monthly salary, a SIP is the natural fit.

There is a middle way for money you already have, such as a bonus, an FD that has matured or the proceeds of a sale. A systematic transfer plan (STP) puts the lump sum into one fund, often a lower-risk debt fund, and moves a fixed amount into an equity fund each month. You spread your entry into the market while the money waiting to move still earns something. The calculator doesn't model an STP, but with a steady return it would end somewhere between the SIP figure and the lump sum figure.

Tax on lumpsum mutual fund gains

In the growth option of a fund, gains are taxed as capital gains when you redeem units, not while you hold them. For equity-oriented funds in 2026-27:

• Held for more than 12 months (long-term): gains are taxed at 12.5%, but only on long-term gains above ₹1.25 lakh in the financial year, counting all your equity shares and equity funds together.
• Held for 12 months or less (short-term): gains are taxed at 20%.

These rates have applied since 23 July 2024 and are unchanged for 2026-27 under the Income-tax Act, 2025. Health and education cess of 4% is added, plus surcharge on high incomes. Debt funds and other non-equity funds are taxed under different rules. The calculator shows values before tax, because your tax depends on your other gains and income in the year you redeem.

Related calculators

To draw a monthly income from a lump sum, for example in retirement, see the SWP calculator. For a return that isn't market-linked, compare a bank FD, fixed for its term, or a tax-free PPF account at a government-set rate. To see what future rupees are worth today, use the inflation calculator, and to check how big a corpus you need, the retirement corpus calculator.

This calculator gives estimates for education and planning. It is not financial advice, and your lender's figures may differ. See how we calculate.