Lumpsum Calculator

How to Use the Lumpsum Calculator

Enter the amount you want to invest once, your expected annual return, and how long you will stay invested. The future value updates instantly. The result grid also shows what the same total money would grow to if drip-fed as a monthly SIP over the tenure — useful when you are deciding what to do with a bonus or windfall.

Lumpsum Calculator Formula

FV = P × (1 + r)^t

P = One-time investment amount
r = Expected annual return (as a decimal)
t = Investment duration in years

Example Calculation

Investing a ₹1 lakh bonus at 12% expected return for 10 years:

FV = 1,00,000 × (1.12)^10 = 1,00,000 × 3.1058

Future value ≈ ₹3.11 lakh — a 3.1× multiple

When a lumpsum is the right tool

A lumpsum investment is simply money put to work all at once — a bonus, an inheritance, maturity proceeds from an FD or insurance policy, or profit from a property sale. Unlike a SIP, where the question is "how much per month", the lumpsum question is "how long can this money stay invested" — because with one-time investing, time in the market is the entire engine. The formula has only three inputs, and tenure is the one that dominates: at 12%, the same ₹1 lakh becomes ₹1.76L in 5 years, ₹3.11L in 10, and ₹9.65L in 20.

The lumpsum vs SIP decision, honestly

This calculator shows both numbers for the same total money because the difference is smaller than most people expect — and the direction is not what SIP marketing implies. Deployed upfront, money simply spends more months invested, so the lumpsum projection is mathematically higher at any constant positive return. What a SIP buys you is not extra return but protection from regret: if the market falls right after you start, only a fraction of your money was exposed.

Confident, long horizon, money you won’t need: lumpsum (or a short 3-month STP).
Nervous, market at highs, or the sum is large relative to your net worth: stagger over 6–12 months.
No lumpsum to begin with: the question is moot — a SIP from salary is the only option, and a good one.

Reading the projection like an adult

The chart above grows smoothly; real portfolios do not. A "12% expected return" decade routinely contains a −25% year and a +40% year. Two practical consequences: first, never put money you need within 3–4 years into an equity lumpsum, because you may be forced to sell in a trough. Second, judge outcomes only at the end of the horizon — a lumpsum looking underwater after 18 months is normal, not a failed strategy. If volatility genuinely keeps you up at night, accept the slightly lower expected value of staggered entry; the plan you can hold beats the plan you abandon.

Frequently Asked Questions

What return should I assume for a lumpsum in mutual funds?

Long-term Indian equity index returns have historically averaged 11–13% annually, but with deep multi-year swings. Using 10–12% for equity funds and 6–7% for debt funds is a reasonable planning range; avoid projecting above 15%.

Is lumpsum better than SIP?

On pure mathematics, investing the full amount immediately beats staggering it roughly two times out of three, because markets rise more often than they fall. But a lumpsum invested just before a crash hurts — SIP/STP staggering trades some expected return for protection against bad timing. See the comparison value in the result grid for your own numbers.

How is a lumpsum investment taxed?

For equity funds, gains held over 12 months are LTCG taxed at 12.5% above the ₹1.25 lakh annual exemption; shorter holdings pay 20% STCG. Debt fund gains are taxed at your slab. Rules change with budgets — verify current rates on incometax.gov.in.

What is the doubling time at a given return?

The Rule of 72 gives a quick estimate: divide 72 by the annual return. At 12%, money doubles roughly every 6 years; at 8%, every 9 years.

Should I invest a windfall all at once?

A common middle path is the STP: park the lumpsum in a liquid fund and transfer a fixed amount to equity monthly over 6–12 months. You stay invested from day one while smoothing entry-timing risk.

Assumptions & Methodology

Returns compound annually at a constant rate — real market returns vary year to year, so treat the output as a projection, not a promise.
The SIP comparison divides the same total amount into equal monthly instalments over the same tenure at the same rate.
Expense ratios, exit loads and capital-gains tax are not deducted.

Sources

SEBI — Investor education on mutual fund returns ↗

All calculations run in your browser and are provided for information only — they are not investment, tax or legal advice. Verify current rates and rules with the official source above before acting.