What is a lumpsum investment?

A lumpsum investment is a one-time deployment of capital into an asset — for example, putting ₹5 lakh into an equity mutual fund in a single transaction instead of staggering it over months as a SIP.

Lumpsum or SIP — which is better historically?

Both have their place. Academic studies on Indian and US markets generally find that lumpsum investing has historically beaten averaging-in roughly two-thirds of the time when markets trended upward over the holding period, but SIPs reduce regret risk and behavioural mistakes for most retail investors.

What return assumption should I use?

For Indian equity, common illustrative assumptions range from 10% to 14%. We default to 12% as a neutral midpoint, but it is an assumption, not a forecast. Use the slider to model multiple scenarios.

Lumpsum Calculator — Compound a One-Time Investment

The math behind this calculator

The future value of a one-time investment growing at a constant annual rate is the simplest possible compounding formula:

FV = P × (1 + r)ⁿ

Where P is the principal you invest today, r is the annual rate of return (as a decimal — 12% becomes 0.12), and n is the number of years the money compounds. The calculator above also shows the year-by-year balance so you can visualise how compounding accelerates over time — the curve is shallow in early years and steepens dramatically as the base grows.

Lumpsum vs SIP — when does each make sense?

The classic Indian retail debate. The case for lumpsum is mathematical: if markets trend upward over the holding period (which they have done over most multi-year windows in Indian equity history), every rupee deployed earlier compounds longer, so a single up-front deployment captures more growth than the same money drip-fed in monthly. The case for SIPs is behavioural: most retail investors cannot stomach a 30% drawdown shortly after deploying ₹10 lakh in one shot, and bail out at exactly the wrong time. Spreading the same amount over 12 or 24 months reduces regret risk and removes the timing question.

A common compromise: split a windfall into chunks. Deploy 30-40% as an immediate lumpsum, route the rest into a 6-12 month SIP. The calculator above lets you model the lumpsum portion; pair it with our SIP calculator to model the staggered portion.

What this calculator does NOT model

Path dependency. Real markets do not deliver a smooth 12% every year — they deliver a noisy average around it. Sequence-of-returns risk matters more for lumpsum than for SIP because you have no future contributions to dollar-cost-average against a drawdown.
Capital gains tax at redemption — see our LTCG calculator for the post-Budget 2024 rates on listed equity.
Inflation. A nominal corpus that looks impressive decades from now may have much less purchasing power. Subtract your expected long-run inflation rate from the return assumption to estimate the real (inflation-adjusted) outcome.
Expense ratios for mutual funds, transaction costs, and brokerage. The return you enter is assumed to already be net of these.

This page is educational only and does not constitute investment advice. Past returns are not indicative of future results. Please consult a SEBI-registered adviser before making any investment decision.

Year-by-year compounding

The math behind this calculator

Lumpsum vs SIP — when does each make sense?

What this calculator does NOT model