Lumpsum Investment Calculator

What is a lumpsum investment?

A lumpsum is a single, one-time deposit into a mutual fund, stock, ETF, fixed deposit, or any asset that grows. Common scenarios: an annual bonus, a Diwali gift from family, a maturing FD, a property sale, or inheritance. Unlike a SIP, you deploy the entire amount upfront and let compounding work.

The compound-growth formula

• P = principal amount invested
• r = expected annual return (as decimal)
• t = time in years

Worked example

₹5,00,000 invested in an equity fund earning 12% for 20 years grows to ₹48.23 lakh — almost 10×. The same amount at 8% (a hybrid fund) grows to ₹23.30 lakh. Even a 4-point difference in CAGR doubles your corpus over two decades. That is the cost of being too conservative when your horizon is long.

Lumpsum vs SIP — which to use when?

• Use lumpsum when markets are flat or correcting and you have a long horizon (5+ years).
• Use SIP when you earn monthly and want to invest as you go.
• Use a STP (Systematic Transfer Plan) when you have a large lumpsum but are anxious about timing — park in a liquid fund, transfer ₹50k–₹1L monthly to equity.

Common mistakes

1. Investing the full lumpsum at market peak without an STP buffer.
2. Picking a single fund — diversify across 2–4 categories.
3. Forgetting taxation — equity LTCG is 12.5% with ₹1.25L exemption (FY 2024–25 onwards).
4. Withdrawing in panic when markets dip 15% in year one. Stay invested; the math still works.

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