The lumpsum calculator below tells you what a one-time investment becomes after n years of compounding. Use it for year-end bonuses, inheritance amounts, EPF withdrawals at job change, or any chunk of money you’re putting into a single mutual fund or ETF in one shot.
The headline truth: lumpsum beats SIP in roughly 65% of historical 10-year windows in Indian equity, simply because more money sits in the market for longer. SIP is for monthly cash flow; lumpsum is for the cash you already have.
How lumpsum returns are calculated
Annual compound interest, applied once a year:
FV = P × (1 + r)ⁿ
- P is the lumpsum invested
- r is the annual return as a decimal (12% = 0.12)
- n is the number of years
This is the same formula every Indian fintech (Groww, Zerodha Coin, ET Money, ClearTax) uses for lumpsum projection. Mutual fund NAV doesn’t compound discretely like a bank’s quarterly FD; it moves continuously. But over a year-long window, annual CAGR is the right summary number.
Worked example: ₹2 lakh year-end bonus, 15 years at 12%
Say you decide to put a ₹2 lakh year-end bonus into a Nifty 500 index fund and leave it for 15 years.
- P = 2,00,000
- r = 0.12
- n = 15
- FV = 2,00,000 × 1.12¹⁵ = 2,00,000 × 5.4736
| Metric | Value |
|---|---|
| Invested amount | ₹2,00,000 |
| Future value | ₹10,94,713 |
| Estimated returns | ₹8,94,713 |
| Wealth gain ratio | 5.47× |
A single ₹2 lakh decision becomes ₹10.95 lakh in 15 years at 12%. That’s why advisors keep saying “deploy bonuses into equity, not into a savings account that earns 3%”. The opportunity cost of not investing a bonus is much larger than people realise.
Lumpsum vs SIP — same money, different deployment
Take ₹6 lakh of capital and 10 years at 12%. Two options:
| Option | What you do | Future value |
|---|---|---|
| Pure lumpsum | Invest ₹6L on day 1 | ₹18,63,508 |
| SIP equivalent | ₹5,000/month × 120 months = ₹6L | ₹11,61,695 |
| STP (lumpsum into liquid, monthly into equity) | Park ₹6L in liquid (~6%), STP ₹50K/month into equity for 12 months | Mid-range, depends on entry timing |
Pure lumpsum wins on this math by ₹7L (60% more) because the full amount compounds for the entire 10 years, not just the average half-life of an SIP. The argument for SIP is purely behavioural — most people don’t have ₹6L sitting around, so SIP from monthly salary is the only option. If you do have a chunk, lumpsum is mathematically superior over long horizons.
The catch: lumpsum has timing risk. If you put ₹6L into the market two weeks before a 30% crash, your patience gets tested. SIP smooths that anxiety. STP (Systematic Transfer Plan) — parking the lumpsum in a liquid fund and transferring weekly/monthly into equity over 6–12 months — is the practical compromise advisors recommend for amounts above ₹3–4 lakh.
How return rate moves the corpus
Same ₹2 lakh, 15-year tenure:
| Assumed return | Future value | Wealth gain |
|---|---|---|
| 8% (debt-heavy hybrid) | ₹6,34,434 | 3.17× |
| 10% (large-cap index) | ₹8,35,449 | 4.18× |
| 12% (flexi-cap / Nifty) | ₹10,94,713 | 5.47× |
| 14% (mid-cap, riskier) | ₹14,26,990 | 7.13× |
| 15% (small-cap, much riskier) | ₹16,28,176 | 8.14× |
A 2% difference in CAGR almost doubles the wealth gain ratio. This is why fund choice and expense ratio matter so much for lumpsum deployment — a 1% expense ratio is a guaranteed 1% drag on CAGR. Use index funds (0.10–0.20%) over active funds (1–2%) unless you have specific conviction in a manager’s outperformance.
How tenure breaks down the corpus growth
Same ₹2 lakh at 12%, varying tenure:
| Tenure | Future value | Returns as % of total |
|---|---|---|
| 1 year | ₹2,24,000 | 11% |
| 5 years | ₹3,52,468 | 43% |
| 10 years | ₹6,21,170 | 68% |
| 15 years | ₹10,94,713 | 82% |
| 20 years | ₹19,29,260 | 90% |
| 30 years | ₹59,91,995 | 97% |
In a 30-year hold, 97% of the final value is returns. Your original ₹2 lakh contributes 3%. That’s the math behind “time in the market beats timing the market” — the longer you stay, the less your specific entry point matters.
When lumpsum makes sense (vs holding cash, FD, or splitting)
A clean checklist for deciding what to do with a one-time chunk:
- Goal is 7+ years away: lumpsum into equity (or STP if amount > ₹3L)
- Goal is 3–7 years: lumpsum into hybrid / balanced advantage funds, or short-term debt
- Goal is < 3 years or fixed-date: FD or short-duration debt — equity volatility is too high for the timeline
- Emergency fund / no specific goal: liquid fund or sweep-in FD, never equity
- You’re nervous about deployment timing: STP over 6–12 months reduces regret if markets fall right after deployment
The big mistake people make is keeping a lumpsum in savings account “until they decide”. Six months at 3% in savings versus 12% in equity is a 4.5% opportunity cost — about ₹9,000 per ₹2 lakh per year. Decide quickly, even if that means a 6-month STP.
Frequently asked questions
Should I invest lumpsum at market highs?
The honest answer based on Indian rolling-return data since 2005: it doesn’t matter as much as you think over 10+ year horizons. If your tenure is 10 years, a 20% drawdown soon after deployment usually recovers within 2–3 years. If your tenure is under 5 years, market timing matters a lot more — and the answer there is to not be in pure equity at all. The “wait for a correction” strategy fails on average because the upside between today and the eventual correction usually exceeds the correction’s depth.
Is STP better than lumpsum for ₹5 lakh?
For ₹3–10 lakh ranges, STP over 6–12 months is the most-recommended path. You park the full amount in a liquid fund, set up a weekly/monthly STP into your target equity fund. Earns 5–6% on the un-deployed portion, gradually averages into equity, reduces regret if there’s a correction. For amounts above ₹10 lakh, STP becomes operationally simpler than trying to time entry.
How is lumpsum tax treated?
Same as any equity mutual fund redemption:
- Equity funds (≥ 65% equity): STCG (under 1 year) at 20%, LTCG (over 1 year) at 12.5% above ₹1.25L per year exemption
- Debt funds (post-April 2023): full slab rate, no LTCG benefit, no indexation
- Hybrid funds: depends on equity proportion
The calculator above shows the gross corpus. Subtract ~12.5% on LTCG portion (above the ₹1.25L exemption) for net post-tax for equity funds. Debt funds at marginal slab — much more painful for HNIs.
Does the calculator account for inflation?
No. The future value shown is in today’s rupees of that year but paid out in future rupees. To convert to today’s purchasing power, divide by (1 + inflation)ⁿ. At 5% inflation over 15 years: ₹10.95L future value ≈ ₹5.27L in 2026 money. Always plan goal targets in real (inflation-adjusted) terms — that’s what your future expenses will actually look like.
Can I use this for FD lumpsum or PPF lumpsum projection?
Yes for FD if you’re using annual compounding (most banks use quarterly — use the FD calculator instead). For PPF specifically, the picture is different because PPF accepts annual contributions, has a 15-year lock-in, and the rate changes quarterly. Use the dedicated PPF calculator (coming soon) for accurate PPF projections.
What return should I assume for lumpsum in equity?
For a 10–20 year horizon in Indian equity, conservative assumptions are:
- Large-cap index (Nifty 50, Sensex): 11–12%
- Flexi-cap / multi-cap: 12–14%
- Mid-cap index: 13–16% (with deeper drawdowns)
- Small-cap: 14–18% (largest swings, hardest to hold)
For shorter horizons or international exposure, adjust accordingly. Don’t use 18% projections for goal planning — they only work if you happen to enter and exit at favourable points, which you can’t predict.
Sources
- AMFI Mutual Fund performance history (CAGR rolling windows 2005–2025)
- SEBI Categorisation of Mutual Funds (October 2017 + amendments)
- Income Tax Act: Section 112A (LTCG) post-Budget 2024 amendments
- Nifty 50 and Nifty Smallcap 250 historical data, NSE