A SIP, or Systematic Investment Plan, is a way of investing a fixed amount into a mutual fund at regular intervals — usually ₹500 or more, on a fixed date every month. Instead of putting in one large sum, you spread your investment across months and years.
That’s the whole idea. Everything else is detail.
How a SIP actually works
You pick a mutual fund scheme, pick an amount, and pick a date. You set up an auto-debit mandate with your bank. On that date every month, the money leaves your account and buys units of the fund.
How many units you get depends on the fund’s NAV — its net asset value, the per-unit price on that day.
Say you invest ₹5,000 a month:
| Month | NAV | Units you get |
|---|---|---|
| January | ₹50 | 100.0 |
| February | ₹45 | 111.1 |
| March | ₹55 | 90.9 |
| April | ₹48 | 104.2 |
Same money each month, different number of units. When the market dips, your ₹5,000 buys more units. When it rises, it buys fewer. Over the years those units pile up, and their value is whatever the NAV has grown to by the time you sell.
What ₹5,000 a month can become
This is the part most people want to see. At a 12% annual return:
| Monthly SIP | Duration | You invest | Estimated value |
|---|---|---|---|
| ₹5,000 | 10 years | ₹6,00,000 | ₹11.6 lakh |
| ₹5,000 | 15 years | ₹9,00,000 | ₹25.2 lakh |
| ₹5,000 | 20 years | ₹12,00,000 | ₹49.9 lakh |
| ₹5,000 | 25 years | ₹15,00,000 | ₹94.9 lakh |
Look at the jump between years 20 and 25. You put in ₹3 lakh more and end up with ₹45 lakh more. That’s compounding, and it’s why time in the market matters more than the amount you start with.
One caveat worth being honest about: 12% is an assumption, not a promise. Indian equity funds have historically returned somewhere in that range over long periods, but any given five-year stretch can be much better or much worse. Run the numbers at 10% and 14% too and see how the range looks.
Rupee cost averaging, without the jargon
Nobody knows when the market will fall. A SIP sidesteps the problem by making the decision for you every month, regardless of what the market is doing.
When prices drop, you’re automatically buying more units at the lower price. When prices climb, you buy fewer. Your average cost per unit ends up smoother than if you’d invested one lump sum on a single day and had to live with whatever the price was that morning.
This is the real benefit, and it’s a behavioural one. The hardest thing about investing is continuing to invest when the news is bad. An auto-debit does it for you.
SIP vs lumpsum
| SIP | Lumpsum | |
|---|---|---|
| How you invest | Fixed amount monthly | One large amount |
| Suits | Salary income | A bonus, maturity payout, sale proceeds |
| Market timing risk | Spread out | Concentrated on one day |
| Minimum | Usually ₹500 | Usually ₹1,000–₹5,000 |
Neither is universally better. If you have a lump sum sitting idle and a 15-year horizon, mathematically it usually pays to invest it and let it compound for longer. If you’re investing out of monthly salary, SIP is the only practical option anyway.
Types of SIP
Regular SIP — fixed amount, fixed date. The default.
Step-up SIP (also called top-up) — the amount rises by a set percentage every year, typically 10%. It matches your salary increments and makes a large difference. ₹10,000 a month for 20 years at 12% gives you around ₹1 crore. The same SIP with a 10% annual step-up crosses ₹1.8 crore.
Flexible SIP — you can raise or lower the amount as your cash flow changes.
Perpetual SIP — no end date. Runs until you stop it. Most people should choose this over a fixed 3-year term, since a fixed end date leads to accidental lapses.
Trigger SIP — invests when a condition is met, like the index falling a set percentage. Ignore this unless you actively track markets.
How much should you invest
Work backwards from a goal rather than picking a round number.
If you want ₹1 crore in 20 years and assume 12%, you need roughly ₹10,000 a month. Want it in 15 years instead? Around ₹20,000. The shorter the runway, the harder your money has to work — or the more of it you have to put in.
A common starting point is 20% of monthly take-home income, split across two or three funds. But an amount you can maintain through a bad year beats an ambitious one you abandon in month eight.
How SIP returns are taxed
Each monthly instalment is treated as a separate investment with its own purchase date. This trips people up. Your January 2024 instalment and your January 2026 instalment have very different holding periods even though you redeem them on the same day. Redemptions follow FIFO — the oldest units are sold first.
For equity funds, current rates for FY 2026-27:
| Holding period | Tax |
|---|---|
| Under 12 months (STCG) | 20% |
| Over 12 months (LTCG) | 12.5% on gains above ₹1.25 lakh a year |
The ₹1.25 lakh exemption is a combined annual limit across all your equity mutual funds and listed shares, not per fund.
Debt funds bought on or after 1 April 2023 are taxed at your income slab rate no matter how long you hold them. There’s no long-term benefit left there.
ELSS funds are the exception worth knowing: they qualify for an 80C deduction under the old tax regime, with a three-year lock-in on each instalment.
Mistakes that cost people money
Stopping when markets fall. This is the single most expensive one. The months when your SIP feels pointless are the months it’s buying units cheap.
Assuming 15% returns. Plan at 10–12%. If you get more, good. If you plan at 15% and get 11%, your goal is short by lakhs.
Running eight SIPs across eight funds. Most large-cap funds hold the same 40 stocks. Three or four funds across different categories is plenty.
Choosing a fixed 3-year end date and then forgetting to renew it.
Ignoring the expense ratio. A 2.2% regular plan versus a 0.6% direct plan sounds trivial. Over 20 years on a ₹10,000 SIP, that gap is worth several lakh rupees.
How to start a SIP
- Complete KYC once — PAN, Aadhaar, a photo, a bank account. Done online in about 15 minutes, valid across all fund houses.
- Pick a platform: the AMC’s own website, or an app like Groww, Zerodha Coin, Kuvera or MF Central.
- Choose Direct plans, not Regular. Same fund, lower expense ratio, no distributor commission.
- Pick your scheme and category.
- Set the amount, date and frequency, and approve the auto-debit mandate.
- Review once a year. Not once a week.
FAQs
What is the minimum SIP amount?
Most funds start at ₹500 a month. Some go as low as ₹100.
Can I stop a SIP anytime?
Yes. There’s no penalty for stopping, and existing units stay invested. The only exception is ELSS, where each instalment is locked for three years.
Is SIP risk-free?
No. SIPs are a method of investing, not a product. The risk comes from the fund you choose. An equity fund SIP can and does show negative returns over short periods.
What happens if I miss a payment?
Nothing serious. Your bank may charge a mandate failure fee. Miss three consecutive instalments and most AMCs cancel the SIP.
Is SIP better than an FD?
Different tools. An FD gives a fixed, guaranteed return of roughly 6–7%. An equity SIP has no guarantee but has historically beaten inflation over long periods. Money you need within three years belongs in an FD.
Can NRIs invest through SIP?
Yes, through an NRE or NRO account with KYC completed. US and Canada residents face restrictions — only a handful of AMCs accept them, due to FATCA compliance.
Mutual fund investments are subject to market risk. Returns shown are illustrative estimates, not guaranteed. This is general information, not investment advice.