What is a lumpsum investment?
A lumpsum investment is a one-time investment of a larger amount. Instead of spreading the money into monthly instalments the way a SIP does, you put the whole amount to work on day one and let compounding run on it undisturbed.
For salaried Indians, lumpsums usually arrive in bursts rather than every month: an annual bonus, leave encashment, a maturing FD or insurance policy, gratuity from a previous job, or the proceeds of selling something. This calculator shows what such an amount could grow to in a mutual fund at an assumed annual return, with a year-by-year chart so you can watch the compounding curve steepen.
How this lumpsum calculator works
The calculator compounds your amount monthly at the assumed annual rate — the same engine as our SIP calculator, so comparing a SIP against a lumpsum on this site is an apples-to-apples comparison:
FV = P × (1 + i)ⁿ
where:
- P = your one-time investment
- i = monthly rate of return = annual return ÷ 12 ÷ 100
- n = number of months = years × 12
Because compounding is applied monthly, an assumed 12% a year works out to an effective ~12.68% annually — slightly more than compounding the same rate once a year would give. If you think of your assumed rate as a fund’s CAGR, treat the projection as a close, slightly optimistic estimate.
A worked example
Invest ₹1,00,000 for 10 years at an assumed 12% per year. At that return it would grow to roughly ₹3.3 lakh — about 3.3× your money — without you adding another rupee. Leave the same amount for 20 years and it becomes roughly ₹10.9 lakh. The second decade adds far more than the first, because compounding accelerates as the base grows — which is why the time-period slider matters more than almost anything else on this page.
Lumpsum or SIP — which should you choose?
If the money is already in your hands and your horizon is long, investing it early gives compounding the most time to work. Mathematically, a lumpsum invested at the start beats the same amount drip-fed over months whenever markets trend upward. The catch is timing risk: invest everything just before a sharp fall and the early years can look painful, even if the maths usually recovers over a long horizon.
A SIP trades some of that upside for steadiness — it averages your buying price across months and turns investing into a habit that fits a salary. A common middle path for a windfall is an STP (Systematic Transfer Plan): park the lumpsum in a liquid or debt fund and move a fixed slice into equity every month. Many investors simply do both — a monthly SIP from salary, plus a lumpsum whenever a bonus lands.
Important: returns are an assumption, not a promise
Mutual-fund returns are market-linked and not guaranteed. The percentage you enter here is an assumption to illustrate compounding — actual results will differ, and a lumpsum feels market swings at full strength from day one. Historically, diversified Indian equity funds have delivered roughly 10–14% over long periods, but the future may look different. Read the scheme documents, and pick an assumption you would be comfortable defending on a bad-market day.