What is a Lumpsum Investment?
A lumpsum investment is a one-time deposit into a mutual fund, FD, PPF or any compounding instrument — as opposed to a monthly SIP. It is best used when you have an unexpected lump (bonus, ESOP payout, inheritance, real-estate sale) and the markets are not at obvious peaks.
Lumpsum Formula — Compound Interest
Future Value = P × (1 + r)^n
where P is the lumpsum amount, r is the annual return rate (decimal), and n is the tenure in years. The calculator above runs this and also shows the inflation-adjusted "real" value using your inflation input.
Lumpsum vs SIP — Which Is Better?
| Feature | Lumpsum | SIP |
|---|---|---|
| Capital | One-time large amount | Small monthly amounts |
| Timing risk | High — entire amount enters at one market level | Low — rupee-cost averaging across cycles |
| Best when | Markets corrected; long horizon | Salaried investor; uncertain markets |
| Discipline | One decision | Automated, builds habit |
Inflation Matters — Look at Real Returns
A ₹1 lakh investment at 12% for 20 years matures to about ₹9.65 lakh — but at 6% inflation, that ₹9.65 lakh has the purchasing power of only ₹3 lakh today. Use the inflation input above to see the real value of your corpus, not just the nominal number.
Tax on Lumpsum Returns
- Equity mutual funds (≥65% equity, held >1 year): LTCG of 12.5% on gains above ₹1.25 lakh per year.
- Debt mutual funds: taxed at your income-tax slab rate (no indexation post April 2023).
- ELSS: same LTCG rules; investment qualifies for Section 80C up to ₹1.5 lakh (3-year lock-in).