Saving & investing
SIP vs Lumpsum: Which Builds More Wealth?
10 min read · Reviewed 26 July 2026 · Ujjwal Technolabs
Neither wins on arithmetic alone — it depends on whether the money already exists. If you are holding a lump sum, deploying it now usually beats dripping it in, because it compounds for longer. If your savings arrive monthly with your salary, a SIP is not a compromise; it is the only version of the plan you can fund.
The short answer
A SIP invests a fixed amount every month; a lump sum invests everything at once. Framed as a contest, the lump sum wins in most historical periods — but that is not a finding about strategy, it is a finding about time. The lump sum only wins because the money was in the market for longer. If the money does not exist yet, that advantage is not available to you at any price.
So the question to ask is not "which returns more" but "do I already have the money?" If yes, deploy it (possibly over three to six months to manage your own nerves). If no, run a SIP and stop worrying that you are choosing the weaker option — you are choosing the only one.
| SIP | Lump sum | |
|---|---|---|
| What it needs from you | A monthly surplus | Money already in hand |
| Money at work on day one | One instalment | All of it |
| Entry-price risk | Spread across many NAVs | Concentrated in one day’s NAV |
| Expected outcome | Lower, because the average rupee is invested for less time | Higher in most rising periods, with a wider spread |
| Discipline required | Low once automated | High — one decision, then patience |
| Holding periods for tax | One per instalment, matched first-in-first-out | A single purchase date |
| Our calculator’s convention | Monthly compounding, start-of-month instalments | Annual compounding |
Comparing the two honestly
The comparison everyone runs, and why it is rigged
Put ₹10,000 a month into the SIP calculator for 10 years at an assumed 12% and you get a projected ₹23,23,390.76 on ₹12,00,000 invested. Put the same ₹12,00,000 into the lumpsum calculator at 12% for 10 years and it projects ₹37,27,017.85. The lump sum appears ₹14,03,627.09 ahead.
That gap is almost entirely an artefact. In the SIP, your first ₹10,000 compounds for 120 months and your last for one — the average rupee is invested for about five years. In the lump sum every rupee is invested for ten. You have not compared two strategies; you have compared five years of compounding against ten.
The fair test: same money, same finish line
Here is the version that actually decides something. You have ₹12,00,000 today and a 10-year horizon. Do you deploy it now, or drip it in over twelve months at ₹1,00,000 a month?
| Route | How it was computed | Value at year 10 |
|---|---|---|
| Deploy all of it now | Lumpsum calculator: ₹12,00,000, 12%, 10 years | ₹37,27,017.85 |
| Drip ₹1,00,000 a month for a year, then hold | SIP calculator: ₹1,00,000 a month, 12%, 1 year → ₹12,80,932.80, then lumpsum calculator on that for 9 more years at 12% | ₹35,52,127.54 |
Waiting a year cost ₹1,74,890.31, or roughly 4.7% of the final corpus. That is the honest price of staggering when markets rise steadily, and it is smaller than most people expect — which is why "spread it over a few months" is a reasonable compromise even though it is not the mathematically optimal one. Had the market fallen during that first year, the staggered route would have finished ahead instead. You are not buying returns; you are buying a narrower range of outcomes.
Both routes above assume the same steady 12%, though the drip route’s first year runs through the SIP tool’s monthly compounding and so is very slightly flattered — the real cost of waiting is a shade higher than ₹1,74,890.31. Real markets also do not deliver a constant rate, and the sequence of good and bad years matters more to a lump sum than to a SIP. Treat the gap as an expected value across many paths, not a prediction for yours.
What rupee-cost averaging does — and does not — do
Because a SIP buys a fixed rupee amount, it automatically picks up more units when the NAV is low and fewer when it is high. Your average cost per unit therefore tends to land below the average NAV over the period, and you never bet the whole amount on one day’s price. That is real and it is useful.
Two limits are worth being blunt about. First, averaging fades. By year eight of a ten-year SIP, a new ₹10,000 instalment is a rounding error against a corpus in the tens of lakhs — the portfolio is exposed to the market, not being averaged into it. Second, averaging says nothing about the exit. If you need the money in a bad year, a SIP corpus falls exactly as much as a lump-sum corpus of the same size. Managing that is a job for asset allocation and for shifting money out as the goal approaches, not for the way you got in.
The under-rated benefit is behavioural rather than mathematical. An auto-debited SIP removes a monthly decision, and removing the decision is what keeps people invested through the months when investing feels stupid. Measured over a decade, a mediocre plan you actually stuck to beats an optimal plan you abandoned in year three — and that gap is far bigger than any of the rupee figures in this guide.
Read the compounding conventions before comparing outputs
Two calculators can both be right and still disagree, so it is worth knowing what each one assumes.
- SIP calculator: monthly compounding, annuity-due. FV = P × ((1 + i)ⁿ − 1) ÷ i × (1 + i), with the trailing factor placing each instalment at the start of its month — the convention most Indian AMC calculators use.
- Lumpsum calculator: annual compounding, so the rate you type is the effective annual rate. There is no periodic contribution to time.
- Compound interest calculator: your chosen frequency, with contributions at the end of each period.
The consequences are measurable. A 12% nominal rate compounded monthly is an effective 12.6825% a year, so "12%" in the SIP tool is very slightly richer than "12%" in the lumpsum tool. And the same ₹10,000 a month at 12% for 10 years yields ₹23,23,390.76 from the SIP tool but ₹23,00,386.89 from the compound interest tool — a ₹23,003.87 difference created purely by start-of-month versus end-of-month timing. Our compound interest guide works through why that one-month shift is worth about 1%.
Tax changes the ranking less than you would think
Run both outcomes through the capital gains calculator as equity held beyond 12 months, using FY 2025-26 rules — 12.5% long-term above a ₹1.25 lakh annual exemption:
- SIP: buy ₹12,00,000, sell ₹23,23,390.76 → gain ₹11,23,390.76, tax ₹1,24,798.84.
- Lump sum: buy ₹12,00,000, sell ₹37,27,017.85 → gain ₹25,27,017.85, tax ₹3,00,252.23.
The lump sum pays more tax because it made more money; its post-tax lead is intact. What does change behaviour is the short-term rate. Redeem those same SIP units inside 12 months and the tool applies 20%, taking ₹2,24,678.15 — nearly ₹1 lakh more on an identical gain.
Two practical notes. The calculator treats your redemption as a single lot, whereas a real SIP has 120 separate purchase dates matched first-in-first-out, so the last year of instalments will be short-term when you exit. And the ₹1.25 lakh exemption resets annually: a ₹2,00,000 purchase sold at ₹3,20,000 after 24 months shows a ₹1,20,000 gain and ₹0 tax, because the whole gain sits under the exemption. The same trade in a non-equity asset such as property or gold is taxed at 20% — ₹24,000 — with no equivalent shelter.
Bound the estimate instead of trusting one number
Before agonising over the schedule, notice how much more the assumed return moves the answer. Drop the SIP assumption from 12% to a still-cheerful 10% and the same ₹10,000 a month over ten years projects ₹20,65,520.20 instead of ₹23,23,390.76 — a ₹2,57,870.56 swing. That is larger than the ₹1,74,890.31 that a whole year of dripping cost in the fair test above.
So the useful routine is to run each tool twice, at a conservative rate and an optimistic one, and to build the plan against the lower figure. If a goal is only reachable at 12%, it is not a plan; it is a hope with a spreadsheet attached.
Who should pick which
- Salaried, saving from monthly cash flow: SIP, no hesitation. Automate it, step it up roughly with your salary, and stop comparing it to a lump sum you do not have.
- Just received a bonus, maturity or property sale: deploy it, but respect your own temperament — all at once is optimal on average, three to six equal tranches costs little and makes staying invested far likelier.
- Money needed within three years: neither. Equity is the wrong instrument for a short horizon; a deposit is more appropriate, and our FD vs RD guide covers the same lump-sum-versus-monthly choice in guaranteed products.
- Large sum, high valuations, genuinely uneasy: park in a liquid or short-duration fund and transfer in over 6–12 months with a fixed schedule you commit to in advance. The rule matters more than the number of tranches.
The caveats that matter
Every figure here assumes a constant rate, a constant instalment and no charges. Mutual fund returns are market-linked: the 12% and 10% used above are assumptions for illustration, not promises, and your actual outcome depends on the sequence of returns over your own holding period. Expense ratios, exit loads and inflation are all excluded, and the tax figures apply FY 2025-26 equity rules to a simplified single-lot redemption.
Treat these as planning estimates, not investment advice. Check your own fund’s numbers and speak to a SEBI-registered adviser or a CA before committing a large sum.
Tools in this guide
- SIP Calculator (India)Project mutual fund SIP returns in ₹ for a monthly investment and expected return.
- Lumpsum Investment CalculatorEstimate the future value of a one-time lumpsum investment in ₹.
- Capital Gains Tax Calculator (LTCG/STCG)Estimate short- and long-term capital gains tax on equity and other assets.
Frequently asked questions
- If I have ₹12 lakh today, should I invest it all at once?
- Statistically, deploying it in one go wins more often than not, simply because markets rise over most long periods and money invested earlier compounds for longer. Our fair-test comparison puts the cost of spreading the same ₹12 lakh over twelve months at about ₹1,74,890 over a ten-year horizon under a 12% assumption. The counter-argument is behavioural: if a 20% fall in month two would make you sell, staggering over three to six months buys you the discipline to stay invested, and that is worth paying for.
- Does rupee-cost averaging reduce risk?
- It reduces entry-price risk, not market risk. Buying every month means you never put the whole amount in at a single price, so your average cost per unit tends to sit below the average price. But once the corpus is large, it is fully exposed to the market — a fall in year nine hits the accumulated units just as hard whether you arrived by SIP or by lump sum. Averaging protects the way in, not the way out.
- Why does our SIP calculator show more than the compound interest calculator for the same inputs?
- Different contribution timing. The SIP tool uses the annuity-due convention with a trailing (1 + i) factor, treating each instalment as invested at the start of its month, which matches most Indian AMC calculators. The compound interest tool adds the contribution at the end of each period. On ₹10,000 a month at 12% for ten years the gap is ₹23,003.87 — about 1%, which is exactly one month of extra growth.
- How are SIP gains taxed when I redeem?
- Each monthly instalment has its own purchase date and its own holding period, and redemptions are matched first-in-first-out. As of FY 2025-26, listed equity and equity-fund units held over 12 months are long-term, taxed at 12.5% above a ₹1.25 lakh annual exemption; units sold within 12 months attract 20% short-term tax. So a ten-year SIP redeemed in one go is mostly long-term, but the last twelve instalments are not.
- Should I stop my SIP when the market looks expensive?
- Stopping converts a mechanical plan into a market call, and a paused SIP misses precisely the low-NAV months that make averaging work. If valuations genuinely worry you, the more defensible response is to change your asset allocation — direct new money towards debt or a deposit — rather than to stop investing altogether and hold cash with no re-entry rule.
- Is a step-up SIP better than a flat one?
- Almost always, because your income rises and a flat instalment silently shrinks as a share of your salary. Raising the amount 10% a year keeps the plan aligned with what you can actually afford and lifts the final corpus well above a flat projection. Our calculator holds the instalment constant, so treat its output as the floor of a step-up plan rather than the expected value.
- Can I do both — a lump sum and a SIP?
- Yes, and it is the common real-world answer. Money already in hand goes in as a lump sum or over a short three-to-six-month window, while a SIP handles what arrives from each month’s salary. They answer different questions: the lump sum is about deploying existing savings, the SIP is about converting future income into investments.