Most people I talk to know they should be investing. That's not the problem. The real problem is nobody tells you how much. You open a mutual fund app, it asks for a monthly amount, and you type in some random number โ โน2,000, โน5,000, whatever feels okay. That's not a plan. That's a guess.
A SIP calculator fixes this. You tell it what you want, when you want it, and what return you're expecting. It tells you the monthly number. Simple as that.
So What Exactly is SIP?
SIP โ Systematic Investment Plan โ is basically an auto-debit from your bank account into a mutual fund every month. Same date, same amount, every month. You don't have to think about it after the initial setup.
The reason it works so well has to do with how markets move. When prices are low, your fixed โน5,000 buys more units. When prices are high, it buys fewer. Over time, this smooths out your average cost โ it's called rupee cost averaging, and it's one of those things that sounds boring but genuinely makes a difference over 10โ15 years.
Plenty of people in India started their whole investment journey through a โน500 SIP. No big lump sum needed, no market timing required. Just start.
The Formula Behind the Calculator
You don't need to memorise this, but it's good to know what's happening under the hood. If you're also curious how interest compounds over time outside of SIPs, our compound interest calculator shows that visually.
FV = P ร {[(1 + r)^n โ 1] / r} ร (1 + r)
FV = Final amount you'll have
P = Your monthly SIP amount
r = Monthly return rate (annual rate รท 12)
n = Total months (years ร 12)
The calculator above flips this โ instead of giving you the final amount, it works backwards from your goal to tell you the monthly amount required. Both modes are available.
A Real Example
Say you want โน50 lakhs in 15 years. You're investing in an equity mutual fund and expecting around 12% annual return. Plug those numbers in โ the calculator will tell you that you need to invest roughly โน9,400 per month.
Now that's a real number you can work with. You can either adjust your goal, extend your timeline, or figure out how to fit โน9,400 into your monthly budget. Much better than guessing.
If you're also running a PPF account alongside your SIP, check what your PPF calculator gives โ combining both is a popular strategy for tax-efficient long-term saving.
What Return Rate Should You Use?
This is where people go wrong โ they either use unrealistically high numbers like 18โ20% and end up disappointed, or they're too conservative and the target amount feels out of reach.
Here's a practical guide for Indian investors:
For large cap or index funds โ stick to 10โ11%. These are diversified, lower risk, and have historically delivered around this range over 10+ year periods. Mid and small cap funds can do 13โ15% but they're also more volatile, so don't bank on those numbers for planning purposes. Debt funds โ 6โ8%. Hybrid funds โ somewhere in between.
Use 10โ11% for equity SIP planning. It's conservative enough that reality is likely to match or beat your projection. Nobody wants to fall short of a goal because they planned on 16% and got 11%.
SIP vs Lump Sum โ Does It Even Matter?
Both have their use. Got a bonus or matured FD sitting in your savings account? Lump sum can make sense โ you can check projected returns on a lump sum using our FD calculator if it's parked in a fixed deposit. For monthly income that you want to put to work regularly โ SIP is almost always the better choice.
The issue with lump sum is timing. Put a large amount in right before a correction and it might take 2โ3 years just to recover to breakeven. SIP sidesteps this because you're buying at every price level, not just one.
For most salaried people in India, SIP is simply more practical. The discipline of a monthly auto-debit is underrated โ it forces you to invest before you spend.
The Step-Up SIP โ Use This If You Can
Your salary will grow over the years. Your SIP amount probably should too. A step-up SIP lets you increase your contribution by a fixed percentage every year โ say 10%.
The difference this makes is significant. Start with โน5,000 at 10% annual step-up for 20 years, and your corpus can be nearly double compared to staying flat at โน5,000 throughout. Most fund houses support this feature now โ it's called top-up SIP and you can set it while starting the SIP itself.
When to Stop or Pause?
Honestly, you should try not to stop it at all โ especially when markets fall. That's exactly when pausing a SIP hurts the most, because you're cutting off your cheapest buying period. People who paused their SIPs during March 2020 missed the recovery entirely.
If cash flow is tight for a month or two, most fund houses let you pause a SIP for 1โ3 months without cancelling. Use that option before stopping it entirely.
Tax on SIP Returns โ Don't Ignore This
Every SIP redemption is treated as a separate transaction for tax purposes, based on when that particular instalment was bought.
For equity mutual funds โ units held under 1 year are short-term capital gains, taxed at 20%. Units held over 1 year are long-term gains โ first โน1.25 lakh per year is tax-free, anything above that is taxed at 12.5%. For debt funds, gains are added to your income and taxed at your applicable slab rate.
Not sure which tax bracket you fall in? Use our income tax calculator to figure out your slab rate โ it helps you estimate the post-tax return on debt SIPs accurately.
If you've been running a SIP for 7โ10 years and are now redeeming, the tax calculation can get complex. Most platforms generate a capital gains statement automatically โ use that while filing your ITR.
SIP vs RD: Which is Better for Monthly Savings?
A lot of people compare SIP with RD (Recurring Deposit) since both involve monthly contributions. RD gives guaranteed returns with zero market risk โ usually 6.5โ7% currently. SIP in equity funds carries risk but has historically returned much more over the long term.
If your goal is 1โ3 years away, RD is safer. Beyond 5 years, equity SIP has almost always beaten RD by a wide margin. Use our RD calculator to compare the numbers side by side and decide what fits your goal and risk appetite.
Can I really start a SIP with just โน500?
Yes. Several AMCs including Mirae, Axis, and Nippon offer SIPs starting at โน500. Some even allow โน100 for specific funds. The amount matters less than the habit โ start small if needed and increase it every year.
What if I miss a SIP payment one month?
Nothing serious usually happens. Your bank may charge a small ECS bounce fee (around โน200โโน500). The SIP for that month simply doesn't happen. Most fund houses send a reminder but won't cancel your SIP for one or two missed payments. Repeatedly missing can lead to cancellation though.
Is SIP safe for long-term goals?
Equity SIP carries market risk in the short term โ if you need money in 2 years, equity SIP is not ideal. But historically, staying in a diversified equity fund for 10+ years in India has rarely given negative returns. For long goals like retirement or a child's education, equity SIP has been one of the best wealth-building tools available.
How many SIPs should I run at the same time?
3 to 5 is a reasonable number โ one large cap or index fund, one mid cap, maybe one international fund. Running 10โ12 SIPs across different funds doesn't add meaningful diversification but does make tracking a mess. Keep it simple and focused.
Can I withdraw SIP money before the target date?
Yes, for open-ended equity funds you can withdraw anytime. ELSS funds have a 3-year lock-in per instalment. Early withdrawal from equity SIP is not ideal if markets are down โ you'll lock in losses. If there's no urgent need, staying invested through volatility is almost always the better call.
The best time to start was 10 years ago. Second best is now โ and you already have the SIP calculator right above. Put in your goal and see what number comes out.