SIP Calculator

What Is a SIP?

A Systematic Investment Plan, or SIP, lets you invest a fixed amount into a mutual fund every month instead of putting in a lump sum all at once. Rather than trying to time the market by guessing when prices are low, you invest the same amount on a set date every month regardless of what the market is doing that day.

Because you're investing regularly through both ups and downs, you naturally buy more units when prices are low and fewer units when prices are high. Averaged out over time, this brings your overall cost per unit closer to the average price over your investment period rather than whatever the price happened to be on a single day. This smoothing effect is commonly called rupee cost averaging, and it's one of the biggest reasons SIPs have become the default way most Indian retail investors put money into equity mutual funds.

How SIP Returns Are Calculated

This calculator uses the standard future-value-of-annuity formula that most SIP calculators are built on:

FV = P × [((1 + i)ⁿ − 1) / i] × (1 + i)

Here, P is your monthly investment, i is the expected monthly return (annual rate divided by 12, then by 100), and n is the total number of monthly installments. The result, FV, is your estimated maturity value at the end of your chosen duration.

A Worked Example

If you invest ₹5,000 every month for 10 years at an expected annual return of 12%, you'd put in ₹6,00,000 in total. Thanks to compounding, the estimated maturity value comes to roughly ₹11.6 lakh, meaning close to ₹5.6 lakh of that is pure returns on top of what you actually invested.

Now stretch the duration to 20 years in the calculator above, keeping the same ₹5,000 monthly amount and 12% rate. Total investment doubles to ₹12,00,000, and the maturity value grows to roughly ₹49.9 lakh, with returns alone accounting for about ₹37.9 lakh. That's more than six times the ₹5.6 lakh in returns from the 10-year scenario, even though the total amount invested only doubled. Doubling the duration didn't just double the outcome; it multiplied the returns portion several times over, which is compounding at work.

Rupee Cost Averaging, Explained With Numbers

Say you invest ₹5,000 every month into a fund. In a month when the fund's unit price is ₹50, your ₹5,000 buys 100 units. If the price drops to ₹40 the next month during a dip, the same ₹5,000 buys 125 units instead. When the price later recovers to ₹60, your ₹5,000 only buys about 83 units.

Notice what happened: you automatically bought more units when the price was cheap and fewer when it was expensive, without having to predict anything or time your entry. Over many months, this evens out your average purchase price and removes the pressure of guessing the "right" moment to invest, something even professional fund managers struggle to do consistently.

The Power of Starting Early

Because SIP returns compound, the number of years you stay invested often matters more than the exact amount you invest each month. Consider two investors: one starts a ₹5,000 monthly SIP at age 25 and stops at 35, letting the corpus sit untouched until 45. The other waits and starts at 35, investing ₹5,000 every month all the way to 45.

Assuming a 12% annual return, the investor who started at 25 and invested for only 10 years typically ends up with a larger corpus at 45 than the one who invested for the full 10 years starting at 35, despite putting in far less money overall. The extra decade of compounding on the early investor's corpus outweighs the additional contributions made by the later starter. This is the core argument for starting a SIP as early as possible, even with a small amount, rather than waiting to invest a larger sum later in life.

SIP vs Lump Sum Investment

A lump sum investment puts your entire amount into the market on a single day, so its outcome depends heavily on the market level that day. Invest right before a downturn, and a lump sum can take longer to recover than a SIP would, since a SIP spreads your entries across many different price points over time instead of one.

SIPs generally suit investors putting away money from regular income, like a salary, and those who'd rather not worry about market timing. A lump sum can make more sense when you have a large amount available at once, such as a bonus or an inheritance, and are comfortable holding it through short-term volatility. Some investors do both: continuing a SIP for new monthly savings while investing an existing lump sum separately.

SIP vs Recurring Deposit (RD)

Both a SIP and a bank Recurring Deposit involve committing a fixed amount every month, which makes them easy to confuse, but the underlying mechanics are quite different. An RD locks in a fixed, guaranteed interest rate for the tenure you choose, and the bank tells you upfront exactly what your maturity amount will be. A SIP into an equity mutual fund carries no such guarantee. Its return depends on how the market performs over your investment period, and it can even be negative over shorter stretches.

The trade-off is potential return versus certainty. RD rates in India have generally sat in the mid single digits in recent years, while equity mutual funds have historically delivered higher average returns over long periods, though with meaningfully more volatility along the way. An RD suits money you'll need on a specific date and can't afford to see shrink, such as a short-term goal. A SIP into equity funds tends to suit longer-term goals of five years or more, where you have time to ride out short-term dips and let compounding work in your favor.

Step-Up SIP: Increasing Your Investment Over Time

Many mutual fund platforms in India now offer a step-up or top-up SIP option, where your monthly investment automatically increases by a fixed percentage or amount each year, often in line with an expected salary increment. Increasing a ₹5,000 SIP by 10% every year, for example, means investing ₹5,000 in year one, ₹5,500 in year two, and so on.

This calculator assumes a flat monthly investment throughout your chosen duration. If you plan to step up your contributions annually, your actual maturity value will be higher than what's shown here, since a growing monthly investment compounds a larger cumulative base over time. Step-up SIPs are worth considering if your income is expected to rise, since they let your investment grow alongside your earning capacity instead of staying fixed in absolute terms.

Factors That Affect Your SIP Returns

Monthly amount. A higher SIP amount scales your final corpus roughly proportionally, all else being equal.

Duration. The longer you stay invested, the more compounding works in your favor. The last few years of a long SIP typically contribute the largest share of total returns, which is why exiting early, even a few years before your original goal, can meaningfully shrink the final outcome.

Expected return rate. Even a couple of percentage points of difference compounds into a large gap over 15 to 20 years, so it's worth being realistic rather than optimistic when choosing what rate to assume.

Fund selection and expense ratio. Different funds within the same category can post meaningfully different returns over time, and the expense ratio, the annual fee a fund charges to manage your money, quietly reduces your returns every year regardless of how the market performs. A 0.5% difference in expense ratio might look trivial on paper, but compounded over 20 years it can add up to a noticeably smaller final corpus.

What Happens If You Miss a SIP Installment?

Missing an occasional SIP payment, say your bank account has insufficient balance on the debit date, usually isn't a serious problem. Most fund houses simply skip that month's installment without penalty, and your SIP continues automatically from the next cycle. Some banks may charge a small fee for a failed auto-debit, separate from the mutual fund itself, so it's worth checking your bank's specific policy on bounced payments.

Missing several installments in a row can sometimes lead to your SIP mandate being paused or cancelled by the fund house after a set number of consecutive failures. If you know you'll be short on funds for an extended period, it's better to formally pause the SIP through your fund platform rather than let it fail repeatedly, since a formal pause avoids any bounce charges and restarts cleanly whenever you're ready.

Common Mistakes SIP Investors Make

Stopping SIPs during a market downturn. This is often the single most damaging habit for a SIP investor. A falling market is exactly when your fixed monthly amount buys more units at a lower price, setting up stronger returns once the market eventually recovers. Pausing or stopping your SIP during a dip defeats the purpose of rupee cost averaging.

Chasing last year's top-performing fund. A fund that outperformed over the past year won't necessarily repeat that performance, and switching funds frequently based on recent returns often means buying high in the new fund and missing the recovery in the one you exited.

Never reviewing the portfolio. SIPs are meant to be a largely hands-off, disciplined habit, but checking in once or twice a year to confirm the fund still matches your goals and risk appetite is still worth doing, especially as you get closer to actually needing the money.

SIP and Taxation in India

Returns from equity mutual fund SIPs are taxed under capital gains rules. Each monthly SIP installment is treated as a separate investment for tax purposes, so units bought at different times carry different holding periods. Gains on units held for more than one year count as long-term capital gains, while gains on units held for a year or less count as short-term capital gains, and the two are taxed differently. Tax rules and thresholds change periodically, so check the current rates on the Income Tax Department's website or with a tax advisor before making decisions based on tax treatment.

ELSS (Equity Linked Savings Scheme) funds are a special category of equity mutual fund that also qualify for a tax deduction under Section 80C, up to the overall 80C limit, making them a popular SIP choice specifically for tax planning alongside long-term growth.

Frequently Asked Questions

Is the return rate guaranteed?

No. Mutual fund returns are market-linked and not guaranteed. The rate you enter here is an assumption for estimation purposes, based on what you expect the fund to average over your investment period, actual returns will vary.

Does this account for inflation?

No, this shows the nominal maturity value. If you want a sense of real purchasing power, you can separately reduce the expected return rate by your assumed inflation rate before entering it here.

Is a SIP a type of mutual fund?

No. A SIP is just a way of investing into a mutual fund, a fixed monthly amount instead of a lump sum. The mutual fund itself, its underlying stocks, bonds, or other assets, is a separate choice you make alongside deciding to invest via SIP.

Can I pause or stop my SIP anytime?

Yes, most fund houses let you pause or cancel a SIP mandate at any time with no penalty, though your existing units stay invested and continue to grow or fall with the market until you redeem them.

Is SIP only for equity mutual funds?

No. You can start a SIP in debt funds, hybrid funds, or index funds as well, not just equity funds. Equity SIPs are the most common because of the long-term compounding and rupee cost averaging benefits, but the SIP mode of investing works with almost any mutual fund category.

Does a higher expected return rate always make sense to assume?

Not necessarily. It's tempting to enter an optimistic rate to see a bigger number, but using a realistic, conservative estimate based on the fund category's long-term historical average gives you a more dependable picture for planning purposes.