SIP Calculator: What Rs 5,000 a Month Looks Like Over 10, 20, and 30 Years

Rs 5,000 a month doesn't feel like much. It's a couple of dinners out, a phone bill, an afternoon of shopping. Skip it for one month and you barely notice. Keep investing it every month for 20 or 30 years, and the number at the end genuinely surprises most people the first time they see it.

Here's exactly what a Rs 5,000 monthly SIP turns into over 10, 20, and 30 years, with the actual compounding math shown at each step, not just a final figure to take on faith.

What is a SIP? #

A Systematic Investment Plan (SIP) is a way of investing a fixed amount into a mutual fund at regular intervals, usually monthly, instead of investing a large sum all at once. Each installment buys units at that month's price, and over time your money compounds as both your principal and your returns keep growing together.

The appeal of a SIP isn't just discipline, it's that consistent monthly investing means you buy more units when prices are low and fewer when prices are high, averaging out your purchase cost over the years without you having to time the market.

How SIP returns are calculated #

The formula for the future value of a SIP is:

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

Where P is your monthly investment, r is the monthly rate of return (annual rate divided by 12), and n is the total number of months invested.

Step by step #

1. Convert your assumed annual return to a monthly rate by dividing by 12.
2. Calculate the number of months (years × 12).
3. Apply the formula above to get the future value.
4. Subtract your total invested amount (P × n) to see how much of the final corpus came from growth versus your own contributions.

For this article, we're using an illustrative 12% annual return, a commonly used long-term equity assumption, not a guaranteed or current rate. Actual mutual fund returns vary and should be checked against real fund performance.

Worked example: Rs 5,000 a month over 10, 20, and 30 years #

At 12% annual return, the monthly rate r = 1% = 0.01.

10 years (120 months) #

(1.01)^120 ≈ 3.300

FV = 5,000 × [(3.300 − 1) / 0.01] × 1.01 = 5,000 × 230.0 × 1.01 ≈ Rs 11,61,500

Total invested: 5,000 × 120 = Rs 6,00,000

Growth from returns: roughly Rs 5,61,500, meaning nearly half the final corpus came purely from compounding, not your own contributions.

20 years (240 months) #

(1.01)^240 ≈ 10.89

FV = 5,000 × [(10.89 − 1) / 0.01] × 1.01 = 5,000 × 989.0 × 1.01 ≈ Rs 49,94,450

Total invested: 5,000 × 240 = Rs 12,00,000

Growth from returns: roughly Rs 37,94,450. At this point, your contributions make up less than a quarter of the final corpus.

30 years (360 months) #

(1.01)^360 ≈ 35.95

FV = 5,000 × [(35.95 − 1) / 0.01] × 1.01 = 5,000 × 3,495.0 × 1.01 ≈ Rs 1,76,49,750

Total invested: 5,000 × 360 = Rs 18,00,000

Growth from returns: roughly Rs 1,58,49,750. Your own contributions are barely a tenth of the final number, the rest is pure compounding over three decades.

Why the growth accelerates so much between 10, 20, and 30 years #

Notice that doubling the time from 10 to 20 years didn't just double the corpus, it grew more than four times over. This is the nature of compound growth: returns earned in earlier years start earning their own returns in later years, and that effect compounds on itself the longer you stay invested.

This is also why financial advisors keep repeating that starting early matters more than investing large amounts later. Someone starting a Rs 5,000 SIP at 25 and stopping contributions at 45 can end up with a larger corpus at 55 than someone starting the same SIP at 35 and continuing all the way to 55, purely because of the extra decade of compounding on those early contributions.

Key benefits of a long-term SIP #

Rupee cost averaging. Investing the same amount every month means you automatically buy more units when the market is down and fewer when it's up, without needing to time anything.

Discipline without effort. Once set up, a SIP runs automatically, removing the temptation to skip investing during a busy month or a market downturn.

Compounding does the heavy lifting. As the 30-year example shows, your own contributions become a shrinking fraction of the total corpus over time, while returns on returns do most of the work in later years.

Common mistakes and myths #

Mistake 1: Stopping a SIP during a market downturn. This is often the worst time to stop, since you're buying units at lower prices, which benefits you once the market recovers.

Mistake 2: Assuming a fixed 12% return every single year. Actual returns fluctuate year to year, some years positive, some negative. The 12% figure is a long-term average assumption used for planning, not a guaranteed annual outcome.

Mistake 3: Underestimating how much starting early matters. Many people delay starting a SIP by a few years, planning to "catch up later" with a larger amount. As the math above shows, that lost decade of early compounding is very hard to make up for with higher contributions later.

Myth: You need a large amount to start a SIP. Many mutual funds allow SIPs starting from Rs 500 or Rs 1,000 a month. Rs 5,000 is a comfortable middle-ground example, not a minimum threshold.

Tips and best practices #

Increase your SIP amount whenever your income grows, even by a small percentage each year, since a step-up SIP can meaningfully boost your final corpus compared to keeping the same fixed amount for decades.

Stay invested through market cycles rather than pausing and restarting, since missing even a few of the market's best-performing months can noticeably reduce your long-term returns.

Review your fund's actual performance periodically against its benchmark and category average, rather than assuming any single return assumption holds indefinitely.

Set your SIP date right after your salary credit date, so the investment happens automatically before other spending has a chance to eat into it.

Internal links and related calculators #

See your own 10-year projection at Rs 5,000 monthly SIP for 10 years, the 20-year version at Rs 5,000 monthly SIP for 20 years, and the full 30-year picture at Rs 5,000 monthly SIP for 30 years.

Want to model a step-up SIP that increases with your income? Check the step-up SIP calculator. If you'd rather invest a lump sum instead of monthly installments, compare outcomes with the lumpsum calculator, or check what annualized return a given corpus implies with the CAGR calculator.

Frequently asked questions #

Is 12% a realistic return assumption for a SIP in India? #

It's a commonly used long-term illustrative assumption for diversified equity mutual funds, based on historical averages over long periods. Actual returns vary by fund, market cycle, and time frame, so treat it as a planning assumption, not a promised outcome.

What if I miss a monthly SIP installment? #

Most funds simply skip that month's investment without penalty, though repeated missed installments over consecutive months can sometimes lead to the SIP being paused or cancelled by the fund house, depending on their specific policy.

Should I choose a 10-year, 20-year, or 30-year SIP horizon? #

Match the horizon to your actual financial goal. A 10-year horizon suits a mid-term goal like a home down payment, while 20 to 30-year horizons suit retirement planning, where the extra compounding time makes the biggest difference.

Can I withdraw from my SIP investment before the target period ends? #

Yes, mutual fund SIP investments (outside of tax-saving ELSS funds, which have a 3-year lock-in) are generally open-ended and can be redeemed anytime, though exiting early usually means missing out on the compounding benefit shown in the examples above.

How does a SIP compare to a recurring deposit for long-term goals? #

A SIP in equity mutual funds carries market risk but has historically offered higher long-term growth potential than a fixed-return recurring deposit, which is safer but typically grows more slowly. The right choice depends on your risk tolerance and how long you can stay invested.

Conclusion #

Rs 5,000 a month looks small in isolation, but compounding turns it into a meaningfully large corpus given enough time, and the difference between 10, 20, and 30 years is not linear, it's dramatic. The earlier you start, the more those extra years of compounding do the work for you.

Run your own numbers, adjust the amount and tenure, and see your projected corpus with the SIP calculator.