Lumpsum Calculator
See what a one-time mutual fund investment could grow to. Enter the amount, expected return and how long you’ll stay invested.
About ₹12,97,000 in today's money at 6% inflation.
| Year | Invested in year | Total invested | Value at year end |
|---|
What a lumpsum investment is
A lumpsum investment means putting a single amount into a mutual fund in one go, rather than spreading it across monthly instalments. You buy units at one day’s NAV and hold them.
It’s what usually happens with money that arrives in a block — an annual bonus, a maturing fixed deposit, proceeds from selling something, gratuity, or an inheritance.
The formula
A = P × (1 + r)^n
- A — the maturity amount
- P — the amount you invest
- r — annual rate of return as a decimal
- n — number of years
₹5,00,000 at 12% for 10 years gives ₹5,00,000 × (1.12)^10, which is about ₹15.5 lakh. Your money roughly triples, and you did nothing after the first day.
What different amounts become
At 12% a year:
| Invested | 5 years | 10 years | 15 years | 20 years |
|---|---|---|---|---|
| ₹1,00,000 | ₹1.76 lakh | ₹3.11 lakh | ₹5.47 lakh | ₹9.65 lakh |
| ₹5,00,000 | ₹8.81 lakh | ₹15.53 lakh | ₹27.37 lakh | ₹48.23 lakh |
| ₹10,00,000 | ₹17.62 lakh | ₹31.06 lakh | ₹54.74 lakh | ₹96.46 lakh |
| ₹25,00,000 | ₹44.05 lakh | ₹77.65 lakh | ₹1.37 crore | ₹2.41 crore |
Notice the shape of it. Between years 15 and 20, ₹10 lakh grows by roughly ₹42 lakh. In the first five years it grew by ₹7.6 lakh. Compounding does almost nothing early and almost everything late, which is why cutting a long investment short is so costly.
Lumpsum or SIP for money you already have
This is the actual question most people are asking when they land here. You have ₹10 lakh sitting in your account. Do you invest it all today, or split it into monthly chunks?
Mathematically, investing it all at once usually wins. Markets rise more often than they fall, so money invested earlier spends more time compounding. Spreading ₹10 lakh over 12 months means the last instalment misses eleven months of growth.
The argument against is regret risk, and it’s not a small one. If you invest ₹10 lakh on a Monday and the market drops 18% over the next quarter, the mathematically correct decision will feel like a disaster, and a lot of people bail at exactly the wrong moment. Staggering the entry over six to twelve months costs you a little expected return and buys you a much better chance of staying invested.
A reasonable middle path: if the money is going into debt or hybrid funds, invest it at once. If it’s going into equity and the amount is large relative to your existing portfolio, split it over six months.
When a lumpsum is a bad idea
- You’ll need the money within three years. Equity funds can be down 20% at any point in a three-year window. That money belongs in a fixed deposit or a liquid fund.
- It’s your emergency fund. Six months of expenses should never be in equity, whatever the expected return.
- You’re borrowing to invest. A loan at 11% against an expected 12% return is not a 1% gain, it’s a guaranteed cost against an uncertain benefit.
- You’re putting it all into one sector or thematic fund because it topped the returns table last year. That table changes every year.
Tax on lumpsum investments
Simpler than SIP, because there’s only one purchase date to track.
| Fund type | Held under 12 months | Held over 12 months |
|---|---|---|
| Equity | 20% | 12.5% above ₹1.25 lakh a year |
| Debt (bought on or after 1 Apr 2023) | Your slab rate | Your slab rate |
The ₹1.25 lakh long-term exemption is an annual limit across all your equity funds and listed shares combined. If you’re sitting on a large gain, redeeming across two financial years can use the exemption twice.
Frequently asked questions
Is lumpsum better than SIP?
For a given sum over a given period, lumpsum usually produces more because the full amount compounds for longer. But most people don’t have a lump sum to invest — they have a salary, and for them SIP isn’t a choice, it’s the only mechanism available.
What’s the minimum lumpsum amount?
Usually ₹1,000 to ₹5,000 depending on the scheme. Some funds set ₹100.
Should I wait for the market to fall before investing?
People have been waiting for a better entry point since markets existed. Money sitting in a savings account earning 3% while you wait is a certain loss against inflation, weighed against an uncertain gain from timing. If the wait is making you anxious, stagger the entry over a few months instead.
Can I add more to a lumpsum investment later?
Yes. Additional purchases in the same scheme are treated as separate investments with their own purchase dates for tax purposes, and redemptions follow FIFO.
What is STP and should I use it?
A Systematic Transfer Plan parks your lump sum in a liquid fund and moves a fixed amount into an equity fund each month. It’s the formal version of staggering your entry, and the parked money earns more than a savings account while it waits. Worth considering for amounts above a few lakh.
Mutual fund investments are subject to market risk. The figures shown are illustrative estimates based on the return rate you enter, not guaranteed outcomes. This is general information, not investment advice.